偏頭痛不只是頭痛。2024 年 The Journal of Headache and Pain 綜述指出,偏頭痛患者常在發作期出現記憶力、注意力、處理速度與執行功能下降,部分人頭痛後仍會腦霧。本文從文獻與中醫觀點解析偏頭痛如何影響認知功能,以及什麼情況需要進一步評估。
很多偏頭痛患者最痛苦的,常常不只是「頭很痛」。
真正讓人崩潰的是:
頭痛來之前,整個人開始怪怪的;
頭痛發作時,腦袋像當機一樣;
頭痛結束後,明明痛已經退了,卻還是覺得疲倦、反應慢、注意力渙散。
有些人會形容:
「我不是只有頭痛,我是整個腦袋不能用。」
「偏頭痛來的時候,我連簡單的工作都做不了。」
「頭痛後隔天還是腦霧,像大腦沒有完全重開機。」
「我很怕自己是不是記憶力退化,甚至擔心會不會變失智。」
這些感受並不是想太多。
2024 年發表於 The Journal of Headache and Pain 的敘述性綜述 Migraine and cognitive dysfunction: a narrative review 指出,偏頭痛患者常見認知抱怨,而認知功能障礙甚至被患者描述為偏頭痛發作相關失能中,僅次於疼痛的第二大原因。文獻也提到,偏頭痛盛行率最高的年齡約落在 30 到 40 歲,剛好是許多人工作、家庭、社會角色最吃重的階段,因此理解偏頭痛如何影響認知功能,對生活品質與職場表現都非常重要。
換句話說,偏頭痛不是「頭痛一下」而已。
它可能會讓大腦在某些階段暫時降速,影響記憶、注意力、反應速度與執行功能。
一般人常以為偏頭痛就是「頭痛的那幾個小時」。但實際上,偏頭痛常常是一個包含多個階段的神經系統事件。
有些人在頭痛前幾小時到幾天,會先出現疲倦、情緒變化、食慾改變、脖子僵硬、打哈欠、對光或聲音變敏感等前驅症狀。有些人則會出現偏頭痛預兆,例如視覺閃光、鋸齒狀光影、手麻、說話困難。頭痛真正發作時,可能伴隨噁心、怕光、怕聲、活動加重。等疼痛退去後,還可能進入所謂的頭痛後期,出現疲倦、腦霧、注意力不集中、脖子僵硬。
這篇綜述也指出,偏頭痛是一個多面向疾病,症狀不只出現在頭痛期;在頭痛前幾小時到幾天,患者可能出現情緒變化與疲倦,頭痛緩解後也可能仍有後期症狀。
這一點對患者非常重要。因為很多人會被誤解:
「你頭不是不痛了嗎?怎麼還說不能工作?」
「你不是已經吃藥了嗎?怎麼還腦袋不清楚?」
「只是頭痛,為什麼需要休息一整天?」
但從偏頭痛的疾病過程來看,頭痛退掉,不代表大腦已經完全恢復。
有時候疼痛只是整個偏頭痛事件中最明顯的一段,前後的大腦功能變化一樣會影響生活。
這篇文獻整理過去研究後指出,偏頭痛患者常主觀抱怨認知功能下降,特別是記憶與注意力。研究中也提到,患者在頭痛發作期最常回報執行功能與注意力相關的認知症狀;有研究顯示,多達 89.7% 的患者在頭痛期回報認知症狀。
臨床上,這些症狀可能表現為:
開會時聽得懂,但抓不到重點。
看文件看了三遍,還是不知道剛剛讀了什麼。
原本很熟的工作流程,突然覺得卡卡的。
講話講到一半忘記要說什麼。
回訊息變慢,打字容易出錯。
反應速度下降,覺得自己像隔著一層霧在思考。
這種狀態常被稱為「腦霧」。
偏頭痛腦霧不是單純懶散,也不是意志力不夠,而是可能和疼痛處理、注意力分配、神經網路連結、睡眠、情緒、藥物使用等因素共同相關。
文獻指出,偏頭痛患者常抱怨注意力與記憶缺損,也可能在發作時出現混亂,進而影響整體認知效率;研究中比較常受到影響的認知領域包括注意力、記憶與處理速度,但會因偏頭痛階段不同而有所差異。
所以,如果偏頭痛來的時候你覺得「大腦變慢」,這其實很符合目前文獻觀察。
這篇文獻最清楚的結論之一是:偏頭痛發作期的認知功能下降,證據相對一致。
文獻整理多項研究後指出,偏頭痛患者在頭痛發作期,與無頭痛期間相比,常出現認知測驗表現下降;受影響較常見的領域包括記憶、注意力、處理速度、執行功能,甚至部分研究也觀察到語言與動作功能受到影響。
這很符合患者的實際經驗。
偏頭痛發作時,大腦一方面要處理疼痛訊號,一方面要面對光線、聲音、氣味、噁心、疲倦等刺激。這時候原本用來工作、思考、記憶、決策的資源,會被大量轉移到疼痛與警戒系統。
可以用一個比喻來說:
偏頭痛發作時,大腦就像一台正在過熱的電腦。
不是硬碟壞掉,也不是資料消失,而是系統正在高負載運轉。
為了保護自己,它會開始降頻、變慢、卡頓。
所以偏頭痛患者在發作時無法高效率工作,是很合理的。
這不是抗壓性差,而是大腦正在處理一場神經系統風暴。
很多患者以為,偏頭痛只要痛退了就結束。但其實頭痛後的恢復期常被低估。
這篇文獻指出,許多研究顯示偏頭痛患者在頭痛期的認知表現較差,而部分研究也觀察到,這種下降可能延續到 postictal phase,也就是頭痛後期。不過,頭痛後期的研究結果比頭痛發作期更不一致,仍需要更多研究釐清。
臨床上,這個頭痛後期很像偏頭痛的「宿醉期」。
患者可能會覺得:
頭痛明明好了,但還是很累。
思考速度還沒有恢復。
情緒比較低落。
注意力不集中。
肩頸仍然緊。
想睡,但睡醒還是疲倦。
這時候如果硬逼自己立刻恢復高強度工作,可能會覺得更挫折。
因為不是你不努力,而是大腦還在從偏頭痛事件中恢復。
這也提醒我們,偏頭痛管理不能只看「疼痛幾分」,也要看發作前後對生活功能的影響。對很多患者來說,真正失去的不是幾個小時,而是整整一天,甚至兩天的工作效率與生活品質。
這是很多人最擔心的問題:
偏頭痛久了,會不會讓認知功能長期變差?
會不會增加失智風險?
會不會讓大腦慢慢退化?
這篇文獻的回答很謹慎。
它指出,偏頭痛患者主觀上常報告認知困難,但客觀神經心理測驗的結果並不完全一致。許多研究支持偏頭痛患者在發作期認知表現較差,有些甚至可延續到頭痛後期;但非發作期是否持續存在認知障礙,目前研究仍不足,也沒有一致結論。
此外,文獻也提到,多項長期追蹤研究並未一致發現偏頭痛患者有更高的認知退化風險;雖然部分登錄型研究曾提出偏頭痛和失智之間可能存在關聯,但整體證據仍不一致。
這裡要講得很清楚:
偏頭痛發作時腦袋變鈍,並不等於你正在失智。
偏頭痛患者有腦霧,也不代表一定會走向認知退化。
比較精準的說法是:
偏頭痛會在發作期,甚至部分頭痛後期,造成暫時性的認知表現下降。
但偏頭痛是否會造成長期不可逆的認知退化,目前還沒有定論。
如果你同時有睡眠障礙、焦慮、憂鬱、血管風險、藥物過度使用,這些共病因素可能比偏頭痛本身更需要被重視。
很多文章為了吸引點擊,可能會直接寫「偏頭痛會失智」。但這種說法太粗糙,也不夠負責任。
這篇綜述提到,偏頭痛與認知功能、失智風險之間的研究結果並不一致。有些研究沒有發現偏頭痛與長期認知下降有明確關聯,也有研究在特定族群中觀察到偏頭痛與失智風險的可能關聯。文獻也指出,偏頭痛曾被報告與靜默性腦病灶相關,而這些腦部變化本身是認知風險研究中值得注意的因素。
所以我們比較建議用這種衛教說法:
偏頭痛不是失智症。
偏頭痛發作時腦霧,不等於腦退化。
但是如果偏頭痛頻繁、合併睡眠差、焦慮憂鬱、血壓血糖血脂問題,或長期過量使用止痛藥,就應該積極管理整體大腦健康。
尤其 40 到 55 歲的商業白領,很容易同時有高壓、睡眠不足、久坐、咖啡因依賴、肩頸緊繃、三高風險、情緒壓力與腦霧。這些因素加在一起,才是真正值得注意的大腦負擔。
偏頭痛不是單一血管問題,而是牽涉疼痛網路、感覺敏感化、神經血管調節與大腦功能連結。
這篇文獻提到,影像研究發現偏頭痛患者可能出現和認知相關的大腦網路變化,例如 frontoparietal network、central executive network、salience network、default mode network 等功能連結異常。這些網路和執行功能、注意力、工作記憶、語意記憶、情節記憶與社交認知等功能相關。
用比較白話的方式來說,大腦不是單一器官在做單一工作,而是一個網路系統。
當偏頭痛發作時,大腦疼痛系統、警覺系統、情緒系統、感覺處理系統都被拉高。
這時候原本負責專注、決策、工作記憶的網路,就可能受到干擾。
你可以想像成公司裡突然發生火警演習。
原本每個部門都在正常工作,但警報一響,所有人都要暫停手邊工作,開始撤離、回報、確認安全。
這時候公司不是沒有能力運作,而是資源被重新分配到危機處理。
偏頭痛發作時的腦霧,就是這種大腦資源重新分配的結果。
這篇文獻提到一個很有意思的概念:cogniphobia,也就是對認知用力的恐懼或逃避。文獻指出,有些偏頭痛患者會把認知用力視為可能誘發偏頭痛的因素,而焦慮、疼痛相關恐懼,可能和更高的主觀認知症狀、較差的神經心理功能表現有關。
這在臨床上其實很常見。
有些患者會開始害怕開長會、害怕看大量文件、害怕連續專注太久,因為過去經驗告訴他:「我一用腦過度,偏頭痛就來。」
久而久之,患者不是能力不夠,而是對大腦負荷產生恐懼。這種恐懼又會加重焦慮,焦慮再讓身體更緊繃,最後偏頭痛更容易被觸發。
這是一個惡性循環:
偏頭痛發作
→ 腦霧與工作失誤
→ 害怕用腦
→ 焦慮與壓力上升
→ 神經系統更敏感
→ 下一次偏頭痛更容易發作
所以偏頭痛治療不能只止痛,也要協助患者重新建立對身體與大腦的安全感。
這篇文獻也提醒,偏頭痛患者的認知抱怨,可能受到共病影響。例如主觀認知下降常和較高疼痛強度、焦慮、憂鬱與睡眠障礙相關。
這點非常重要。
有些患者以為「我就是偏頭痛造成記憶變差」。
但實際上,可能是偏頭痛、睡眠不足、焦慮、憂鬱、止痛藥使用、工作壓力、荷爾蒙波動、血糖不穩等因素共同造成腦霧。
尤其睡眠很關鍵。
如果偏頭痛讓你睡不好,睡不好又降低疼痛抑制能力,第二天注意力與記憶自然變差。
如果再加上焦慮,腦袋會更難關機。
如果長期靠咖啡硬撐,可能又干擾睡眠節律。
所以偏頭痛合併腦霧時,治療策略不應該只問:「哪一顆止痛藥最有效?」
更應該問:
睡眠有沒有恢復?
壓力系統有沒有降下來?
焦慮或憂鬱有沒有被處理?
頭痛頻率是否越來越高?
止痛藥是否越吃越多?
月經或荷爾蒙週期是否影響發作?
肩頸與腸胃狀態是否長期失衡?
這樣才能真正降低偏頭痛對認知功能的影響。
對 30 到 50 歲的族群來說,偏頭痛最大的傷害之一是職場表現。這篇文獻也提到,偏頭痛盛行高峰落在 30 到 40 歲,正是許多人最有生產力的年齡層;偏頭痛相關認知障礙可能限制社交與專業互動,進而降低生活品質。
偏頭痛患者在職場上常遇到的問題不是「完全不能工作」,而是功能波動很大。
沒有發作時,可能表現很好。
發作前,開始覺得怪怪的但說不上來。
發作時,無法看螢幕、無法開會、無法思考。
發作後,疼痛退了,但處理速度還沒回來。
這種波動最容易被誤解成「不穩定」、「抗壓性差」、「情緒化」、「不夠自律」。但實際上,它是偏頭痛疾病特性的一部分。
對患者來說,最實際的做法不是硬撐,而是建立一套偏頭痛管理策略:
知道自己的誘發因子。
紀錄發作前兆。
在發作早期介入。
避免止痛藥過度使用。
調整睡眠與壓力節律。
必要時接受預防性治療。
若合併腦霧、焦慮、失眠,要一起處理。
從中醫角度來看,偏頭痛合併腦霧,常常不只是單純頭痛,而是身體整體調節能力失衡。
有些人是肝鬱化火,壓力一大就頭痛、眼脹、煩躁、睡不深。
有些人是痰濕上擾,頭重昏沉、腦袋像包住、噁心、胃脹、天氣變化就發作。
有些人是血瘀阻絡,疼痛固定、刺痛、反覆多年,常合併肩頸僵硬。
有些人是氣血不足,疲倦、頭暈、記憶力下降、工作一久就頭痛。
有些女性則和月經週期、肝鬱血瘀、氣血失調密切相關。
如果用現代語言轉譯,中醫辨證其實是在問:
這個人的大腦為什麼那麼容易被點燃?
為什麼疼痛系統那麼敏感?
為什麼睡眠修復不足?
為什麼壓力一下來,頭痛就爆發?
為什麼頭痛後,腦袋恢復特別慢?
所以中醫治療偏頭痛,不應該只被理解成「止痛」。
更重要的是透過辨證,改善身體長期處於緊繃、上火、痰濕、瘀阻、虛弱或睡眠失衡的狀態,讓神經系統不要一直處在容易過熱的模式。
偏頭痛發作時腦袋變鈍很常見,但如果出現以下情況,就不建議只當作一般偏頭痛:
第一,記憶力或注意力下降越來越明顯,而且不只發作期才有。
第二,頭痛型態突然改變,例如變得更劇烈、更頻繁,或位置不同。
第三,出現說話困難、單側無力、視野缺損、意識混亂。
第四,50 歲後才出現新的頭痛型態。
第五,頭痛合併發燒、頸部僵硬、體重下降、癌症或免疫低下病史。
第六,止痛藥越吃越多,頭痛反而越來越頻繁。
第七,家人明顯觀察到你日常功能退步,而不是只有你自己覺得腦霧。
這些狀況需要進一步評估,必要時排除次發性頭痛、腦血管疾病、感染、顱壓問題、藥物過度使用性頭痛,或其他神經系統疾病。
這篇 2024 年 The Journal of Headache and Pain 綜述給我們一個很重要的提醒:偏頭痛不是只有疼痛,它也可能伴隨認知功能變化。患者主觀上常報告記憶、注意力、執行功能下降;客觀研究則較一致地支持偏頭痛發作期的認知表現下降,部分患者可能延續到頭痛後期,但非發作期與長期認知退化的關係,目前仍沒有一致結論。
所以最精準的說法是:
偏頭痛發作時腦袋變鈍,不是你想太多。
偏頭痛後還腦霧,也不是你太脆弱。
但偏頭痛腦霧不等於失智,也不代表大腦一定在退化。
真正重要的是,不要只把偏頭痛當作「頭痛」。
它是一種會影響疼痛、感覺、睡眠、情緒與認知功能的神經系統疾病。
如果你常常偏頭痛、怕光、想吐、腦霧、記憶變差、工作效率下降,治療目標不應該只是找到更強的止痛藥,而是讓大腦從反覆過熱、警戒、發炎與失衡的狀態中慢慢穩定下來。
偏頭痛不是你的大腦壞掉。
它比較像是大腦太常進入「高警戒模式」。
真正好的治療,是讓警報不要一直響,讓大腦重新找回清楚、穩定、能專注的節奏。
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Migraine and cognitive dysfunction: a narrative review
Review
Published: 19 December 2024
Volume 25, article number 221, (2024)
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The Journal of Headache and Pain
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Abstract
The association between migraine and cognitive function has been studied during the last decade, however, this relationship is not well established. As migraine prevalence is highest between the ages of 30–40, aligning with some of our most productive years, we must understand cognitive changes within this disorder. Cognitive impairment potentially limits social and professional interactions, thus negatively impacting quality of life. Therefore, we will review the relationship between prevalent migraine and cognition. Cognitive dysfunction has been reported to be the second largest cause of disability, after pain, in migraine patients. While subjective patient reports on cognition consistently describe impairment, findings for objective neuropsychological assessments vary. Many studies report worse cognitive performance in the ictal phase compared to controls, which can persist into the postictal period, although whether this continues in the interictal period has been understudied. There is limited consensus as to whether cognition differs in migraine with aura versus migraine without aura, and while many studies do support cognitive impairment in chronic migraine, it remains uncertain as to whether this is more debilitating than the cognitive difficulties experienced by those with episodic migraine. To date, objective assessment of neurological abnormalities that may underlie cognitive impairment through neuroimaging has been underutilized. There is limited consensus as to whether cognitive impairment is a characteristic specific to migraine, whether it is driven by a combination of factors including co-morbidities such as anxiety, depression, or vascular dysfunction, treatment, or whether it is a more general characteristic of pain disorders. Overall, increasing numbers of studies support cognitive impairment in migraine patients. Future studies should consider longitudinal study designs to assess cognition across different migraine phases and subtypes of the disorder, including migraine with aura and chronic migraine, as well as controlling for important confounders such as treatment use.
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Introduction
Migraine is one of the most prevalent disorders globally, affecting an estimated 14% of the population [1]. According to the Global Burden of Disease Study, migraine is the second-leading cause of years lost to disability [2] and the first in women [2]. Consequently, the socio-economic burden of migraine is large, costing the European Union an estimated €50 billion annually [3]. Productivity loss makes up 93% of the economic cost of migraine. Despite patients reporting cognitive symptoms to be the second-largest cause of attack-related disability after pain [4], the potential impact of migraine on cognitive performance remains controversial.
Migraine is a multifaceted disorder with symptoms extending beyond the headache phase. In the hours to days preceding the headache phase, patients may experience preictal symptoms, including mood changes and fatigue. Similarly, following headache resolution, postictal symptoms may be present. There are several subtypes of migraine; 30% of patients may experience a transient migraine aura consisting of sensory and, in some cases, motor disturbances lasting between 5 and 60 min (migraine with aura (MwA)) [5, 6], while the majority of patients have migraine without aura (MwoA). Furthermore, annually, 3% of migraine patients develop chronic migraine (CM) as they surpass 15 headache days per month, whereby 8 meet migraine headache criteria [7]. There is no current consensus on how cognition differs in different migraine phases or forms.
Cognitive performance can be assessed across various functional domains, including attention, concentration, memory, executive functioning, reasoning and problem-solving, processing speed, and language through neuropsychological evaluation. Furthermore, cognitive functioning can also include social cognition, such as the ability to understand social cues and interact with others [8]. These cognitive abilities are essential for daily life, underlying our capacity to perform routine tasks, make decisions, and adapt to changing environments.
Several studies have investigated the association between migraine and cognitive function, although the results are discordant [9]. Several authors have suggested that these inconsistencies regarding cognitive impairment and migraine in the literature may be due to methodologic issues such as sample size, unrepresentative samples, and lack of adequate comparison groups [10]. In contrast, other studies suggest that cognitive impairment is present compared to healthy controls (HCs) and that this impairment contributes to the worsening of quality of life alongside pain symptoms [9, 11, 12]. Additionally, the impact of frequent migraine attacks on cognition is a common source of concern for patients, as it is unclear whether attack repetition may have long-term consequences [13]. This highlights the importance of considering the complexity of migraine, focusing on broader impairment, beyond pain symptoms [14].
Consequently, in this review we evaluated the current consensus of cognitive performance in migraine patients during migraine episodes, focusing on cognitive impairment across different migraine phases, and different subtypes of the disorder. The influence of confounders, such as the presence of comorbidities including depression [15], and the use of prophylactic and acute treatments were considered [16].
To achieve this, we performed a non-systematic search on the PubMed/MEDLINE and EMBASE databases, and we used the following terms in our search strategy: “migraine” OR “chronic migraine” OR “episodic migraine” AND “cognition” OR “cognitive performance” OR “cognitive impairment”. Studies followed the established inclusion criteria, peer-reviewed journal articles and only reported studies performed on living humans, and the exclusion criteria, reference lists, gray literature, and non-human studies.
Subjective cognitive impairment in migraine patients
Self-reported subjective cognitive impairment is most common in the elderly and correlates with age. There is a cumulative transformation rate to dementia of 10.7% over 5.2 years [17]. Similar subjective cognitive complaints have also been described in migraine patients [11]. A Taiwanese study, of 589 migraine patients and 80 healthy controls, showed that subjective memory complaint scores were similar in both groups. However, analysis of female MwA patients showed higher attack frequency correlated with higher scores on Ascertain Dementia 8 questionnaire [11]. Additionally, a Korean study reported a 44.7% prevalence of subjective cognitive decline in a cohort of 188 migraine patients, concerning patients with higher pain intensity and comorbid psychiatric disorders, such as anxiety and depression, and sleep disturbances [18]. Migraine patients often report cognitive impairment before it is evidenced by subjective and objective testing [see Additional file 1]. Subjective complaints are typically expressed through questionnaire and detail an individual’s perception of cognitive impairment and difficulties. When assessing patient self-report of cognition, 89.7% report cognitive symptoms during the headache phase of the attack, most commonly in executive function and attention [19]. On an Ascertain Dementia 8 questionnaire, female MwA patients had higher scores than HCs, indicating a self-perceived decline in cognitive abilities [11]. Furthermore, a Korean study reported a 44.7% prevalence of subjective cognitive decline in a migraine cohort [18]. However, this subjective cognitive impairment has been shown to correlate with higher pain intensity, and comorbid anxiety, depression, and sleep disturbances [8, 18].
Patients have reported cognitive exertion as a potential migraine trigger. This may be the basis for the development of cogniphobia: the fear and avoidance of cognition exertion) [20]. A study of the associations between cogniphobia and key fear-avoidance constructs in migraine patients concluded that higher anxiety and pain-related fear is related to greater self-report of cognitive symptoms and lower neuropsychological functioning [20].
Summary: Subjective cognitive impairment, manly memory and attention complaints, are common in migraine patients with comorbidities such as depression, anxiety and/or sleep disturbances.
Objective cognitive performance in migraine patients
Migraine is a brain disorder accompanied by a risk of cognitive impairment [14, 21]. Evidence from neuropsychological measurements has suggested that cognitive functioning may differ during and between migraine attacks [21].
Cognitive symptoms, such as inattention, are reported throughout migraine phases, but there is a lack of knowledge about objective cognitive profiling. A meta-analysis, including 22 studies, showed a lower general cognitive function in the migraine group compared to HCs, especially in the language domain. However, no significant differences were found in visuospatial function, memory, or attention [18].
During migraine attacks, cognitive impairment is considered one of the most disabling manifestations [22]. As such, several studies have assessed cognition during migraine attacks, identifying transient declines in processing speed and working memory [23]. Meyer et al. showed that Mini-Mental State Examination (MMSE) scores decreased significantly during a migraine attack in patients who had normal scores during headache-free periods [24]. A home-based computerised cognitive test study examined the effect of cognition during migraine phases. During the headache and postdrome phase, migraine patients had a cognitive decline in working memory and simple and choice reaction time compared to the interictal period. Using a home-based computerised cognitive test, a decline in working memory and simple and choice reaction time has been identified in the headache and postdrome phase compared to the interictal period [23]. However, no consensus exists between different neuropsychological, clinical-based, and population-based studies on interictal cognitive dysfunction [20].
Beyond this, longitudinal studies evaluating the relationship between migraine and cognitive decline consistently fail to identify an increased risk of cognitive decline in migraine patients [25, 26]. A large population-based study of Danish twins investigated the cognitive functioning of migraine patients and healthy controls using a battery of tests, including Fluency, Forward and Backward Digit Span tests (DST), a Modified 12-Word Learning Test with immediate and delayed word recall, and a Symbol-Digit Substitution Task (SDST). Average scores did not differ between groups. The adjustment for possible confounders (age, sex, and schooling) suggested that a lifetime diagnosis of migraine was not associated with cognitive deficits [10]. Indeed, a Dutch population-based study of migraine patients found that middle-aged and elderly migraine patients, especially those with MwA, actually had higher MMSE scores and g-factor, a domain-independent general cognition indicator, than non-migraineurs [27].
Nevertheless, a significant association between migraine and dementia risk has been observed in an Asian subgroup [28]. Also, a Swedish population-based longitudinal study compared the cognitive performance of healthy controls and patients with migraine and non-migraine headaches. The authors found that migraine patients were younger and had a higher MMSE score at baseline [29]. Moreover, migraine has been associated with silent brain lesions, which are known risk factors for dementia. However, epidemiological studies have yielded inconsistent evidence with several population-based studies finding no association between migraine and cognitive decline. Conversely, several register-based studies did suggest an association of migraine with dementia [29]. Although the prevalence of dementia was around 0.49 (0.20–1.21) for migraine group, there was no evidence supporting the associations of migraine and its subtypes with cognitive decline and dementia among older adults [29].
Summary: Differences in cognitive functioning may differ during and between migraine but there still is more to know about cognitive profiling and the long-term effect of migraine on cognition.
Migraine and affected cognitive domains
The literature states that migraine patients complain primarily of deficits in attention and memory but also confusion during attacks, which compromises cognitive efficiency [30]. Clinic-based studies report worse cognitive performance on verbal and visuospatial memory, information processing speed, executive function, and attention, even during the interictal period [9, 14, 22, 31,32,33,34,35]. Migraineurs have trouble adjusting attention, requiring more time for automatic processes, and show cortical hyperexcitability and lack of habituation to repeated stimuli, known as one form of learning mechanism [32].
Summary: The cognitive domains that seem more affected in migraine patients are attention, memory and processing speed, but they can differ between the ictal or interictal phase.
Objective findings of cognitive impairment in migraine
Many measures of cognitive ability use subjective examination; however, the use of objective measures has the potential to identify possible biomarkers of cognitive impairment in migraine patients. Magnetic resonance imaging (MRI) and electroencephalography (EEG) are commonly used in clinical settings and research, especially when assessing neurological pathologies. A similar implementation may be beneficial for the migraine field.
MRI is widely used to examine structural and functional neurological changes. This can be utilised to identify changes associated with cognitive impairments. Some evidence suggests that migraine may be associated with white matter lesions (WML) [36]. However, studies in this regard are conflicting. While some studies theorise that the association between WML and migraine is purely incidental or caused by comorbidities, others identify no causal relationship between migraine and WML [37]. A significant limitation in this area is the lack of availability of MRI scans pre- and post-migraine diagnosis. WMLs are of substantial interest as a clear association between WML and cognitive impairment has been noted within the literature [38].
Daglas et al. investigated the potential causality between genetic liability to migraine and Alzheimer’s disease through assessment of brain volume. The possible association between interictal migraine cognitive function and dementia risk remains controversial; identification of silent WML and regional brain volumes could provide evidence to support this link. Nevertheless, in the above study, genetic liability to migraine was not associated with Alzheimer’s disease or any brain volume measures [39]. These null findings are consistent with multiple cohort studies, which did not identify an effect of migraine on rates of cognitive decline [39].
Functional MRI (fMRI) can be used to characterise regions of altered activity in migraine, thus making the relationship between migraine and cognitive functioning better understood [40, 41]. One study identified altered frontoparietal network connectivity [42] involved in executive functioning and mental flexibility. A reRt systematic review of neuroimaging of memory function in migraine highlighted nine studies that showed altered activity in memory-related structures, including the hippocampus, insula, and temporal cortices, providing objective evidence supporting memory alterations in migraine patients. Furthermore, patients with MwoA showed abnormal intrinsic connectivity within the bilateral central executive network (CEN) and salience network (SN) and more excellent connectivity between the default mode network (DMN) and right CERN and the insula, angular and supramarginal gyrus. These networks have been associated with cognition, such as working, semantic, and episodic memory, attention, social cognition, and executive function. These studies underlie a possible neurobiological mechanism of pain-related reorganization of connectivity and the impact on cognitive performance [42]. Further studies are required to fully understand the neurological changes that may underlie cognitive alterations in migraine, covering a broader range of cognitive domains. Studies have identified overlap between regions of altered activity and areas that are associated with a role in pain processing, highlighting a need for additional studies across a variety of pain disorders to identify migraine-specific and pain-related functional changes that impact cognition [43].
Other functional imaging studies, such as positron emission tomography, support a prefrontal and temporal cortical dysfunction during migraine attacks that can be clinically associated with a predominant involvement of processing speed, attention, and memory [44].
Electroencephalography (EEG) can also be used to assess altered neurological functioning which may underlie cognitive changes in migraine. While EEG studies have been under-utilised to date, one study has identified changes in beta event-related desynchronisation during sensorimotor processing across different migraine phases [45], thus highlighting the potential for this approach to be expanded to assess cognition, both across different migraine phases and compared to HCs.
Objective assessment of neurophysiological changes in cognitive processing has been underutilised to date. Broader utilisation of such approaches would enable a clearer understanding of which cognitive domains are affected and which migraine phases, allowing a better understanding of migraine prognosis and betterment of patient QoL.
Summary: Although there is evidence of a connection between cognitive functioning and objective findings during or between migraine episodes, there is still not enough data to have a solid conclusion on this matter.
Cognitive performance across migraine phases
Though headache is the predominant migraine symptom, other symptoms, including cognitive symptoms, develop over the migraine episode [46]. Thus, researchers have tried to establish whether objective cognitive impairments are present during the ictal or peri-ictal phases in migraine patients [23, 24, 34, 41, 47,48,49,50,51,52,53,54,55,56].
A systematic review assessing decreased cognitive functions during a migraine attack compared to headache-free performance [53]. Five studies were included. They all showed a performance reduction in cognitive tests during the ictal phase of the migraine episode compared to the pain-free period [24, 47, 48, 50]. These findings were later confirmed by three original studies published after 2014, which showed decreased cognitive functions in the ictal phase compared to the interictal phase [23, 34, 41].
An impairment in global cognition during the ictal phase, compared to a headache-free period, was found in one study [24]. The most affected cognitive domains were memory, attention, and processing speed, present in six [4, 23, 34, 47, 48, 50] out of the seven [4, 23, 34, 41, 48, 50, 52] studies that assessed them. The remaining impaired domains were in executive function, found in three [41, 48, 50] out of four [34, 41, 48, 50] studies, and in motor function, found in two [41, 47, 50] out of three [34, 41, 47] studies. Language impairment was found in one [34] of the two [34, 41] studies that assessed it, while impairment in the visuospatial domain was only found in the study that assessed it [4]. However, the studies that assessed memory, attention, processing speed, executive function, and language using a comprehensive battery of tests for each cognitive function [34, 41] found impairments in only one test among the two to four used. Thus, not all cognitive tests are sensible in detecting ictal impairment in mental performance.
While there is consistent evidence supporting the presence of cognitive impairments in migraine patients during the ictal phase, data regarding the presence of a decline in mental performance during the preictal and postictal phases are less conclusive. Four studies assessed cognitive impairments during the postictal phase with conflicting results. Two showed no differences in cognitive function between migraine patients during the postictal and the interictal phase [52, 57]. Conversely, the other two studies showed worse performance in cognitive tests in the post-ictal phase compared to the interictal phase, specifically in attention [23, 51], processing speed [23, 51], and memory domains [23]. However, among those four studies, only one did not allow acute medication use before the evaluation [52]. One study assessed postictal migraine patients following the utilisation of acute migraine drugs [23], while the other two did not specify if patients took acute medication before the assessment [51, 57].
Only one study assessed the presence of cognitive impairments during the preictal phase [23]. In this study, migraine patients performed one month of daily testing with a computerised cognitive battery assessing memory, attention, and processing speed [23]. Then, the performance of each test in the preictal, ictal, and postictal phases was compared with the performance in the interictal days. The authors showed reduced cognitive performance during the ictal and postictal phases, with the latter being less pronounced. Conversely, no significant differences were observed between the pre and interictal phases [23].
Overall, these results confirm that objective cognitive impairments occur in migraine patients during the ictal phase and could persist in the postictal phase in a subgroup of patients. Alternatively, no reduction in cognitive performance has been shown in the preictal phase. However, whether these cognitive impairments could be considered an epiphenomenon due to the ongoing pain processing in the brain [58] or a migraine-specific phenotype is still a point of debate. Studies that fail to find significant differences in ictal cognitive performance between migraine and cluster headache patients or patients with other pain conditions support the first hypothesis of ongoing pain processing [49]. This may explain why cognitive impairment is most commonly observed in the ictal but not the preictal phase [23] when, conversely, activation of cortical and subcortical brain regions associated with a migraine episode is already in place [59, 60]. In contrast to this hypothesis, a recent study found that the reduction in cognitive performance occurred only on “migraine days” but not on “non-migraine days,” suggesting that cognitive impairments could be considered a characteristic of migraine [23]. Whilst evidence does indicate a reduction in cognitive performance during the migraine attack, more research is needed to conclusively determine the presence of cognitive impairment during the preictal and postictal phases.
Summary: Migraine patients had objective cognitive impairments during the ictal phase, especially in memory, attention, processing speed, and executive functions, and during the postictal phase, in attention, processing speed, and memory domains (See Fig. 1).
Fig. 1
The alternative text for this image may have been generated using AI.
Migraine episode and cognitive function - a representation of “the cycle of migraine” and the findings in the cognitive function according to our review. (Created with BioRender.com)
Cognition in episodic migraine with aura vs. migraine without aura
Few studies have detailed the discrepancies between cognition in MwA compared to MwoA. Le Pira et al. conducted two studies using tests, including the California Verbal Learning test (CVLT) and the Rey Complex Figure test (ROCF-m), which assesses verbal memory and learning strategies, to compare MwA and MwoA patients. The initial study found no significant differences in CVLT, but the subsequent study showed that MwA patients performed significantly worse [61, 62]. Additionally, ROCF-m showed no significant differences in short- and long-term verbal memory between the groups, although MwA individuals with bilateral or right-sided pain performed worse than MwoA patients, although not significantly [61, 62]. Further assessments using the DST and Corsi Block-Tapping Test found no differences in working memory between MwA and MwoA [61, 62]. Despite some evidence of significant verbal memory impairment in MwA, it is inconsistent, and the impact of aura on memory remains inconclusive.
The Trail-Making Test (TMT) assesses attention and processing speed. It comprises two parts: Part A involves sequentially connecting numbers, while Part B alternates between numbers and letters. In a Latin American cohort, MwoA patients performed significantly worse on TMT B; however, the MwA cohort was underpowered, limiting the generalisability of these findings [63]. Conversely, other studies have not identified significant differences in TMT performance between MwA and MwoA patients [64, 65].
Additional tests assessing attention and processing speed, such as the Continuous Performance test, the Colour Word Task, the Checkerboard Attention test, and the SDST, revealed significantly slower reaction times in MwA compared to MwoA patients [57, 66, 67]. Le Pira et al. demonstrated impaired selective attention in MwoA patients, but subsequent studies did not corroborate this finding [61, 62, 65]. Furthermore, the Pattern Perception test, evaluating visual perception, spatial processing, and attention, showed no differences in reaction times between the two migraine subsets [57]. Despite some studies indicating differential impacts on attention and processing speed between MwA and MwoA, these findings are inconsistent, underscoring the need for further powered studies to be able to conclude attention and processing speed discrepancies between MwA and MwoA.
The Frontal Assessment Battery Test, which evaluates motor programming, mental flexibility, and sensitivity to interference, revealed significantly poorer performance in MwA compared to MwoA patients [65]. However, this finding was based on a single study, necessitating further research to draw reliable conclusions. Conversely, investigations into language functions using the Phonemic Fluency Word Generation test, Verbal Fluency test, and the Controlled Oral Word Association test reported equal performance between the two migraine subsets and HCs [61, 63, 65]. Similarly, no differences were observed in social cognition, assessed by the Raven Progressive Matrices 47 Test, which evaluated comparative reasoning and analogical thinking [62, 63].
Current evidence indicates that MwA and MwoA patients exhibit cognitive impairments, with MwA patients experiencing more pronounced deficits [62]. Specifically, in multiple studies, MwA patients showed significantly poorer attention and processing speed performance, particularly under conditions requiring sustained focus and rapid processing. This suggests that aura, despite causing temporary sensory disturbances, may have lasting effects on attentional and processing capacities. The evidence suggests these deficits are confined to higher-order cognitive functions, as no significant differences were observed in primary sensory processing, perception, and recognition tests. Additionally, no language and social cognition differences were found, although the research was limited. Findings are further limited by potential selection bias as studies recruited patients from their neurological department and commonly had underpowered MwA populations. Moreover, the variability in neuropsychological assessments across studies hinders the ability to draw reliable comparisons. Further research is needed to clarify these cognitive differences and their underlying mechanisms.
Summary: Evidence indicates that MwA and MwoA patients exhibit cognitive impairments, specifically, MwA patients showed poorer attention and processing speed performance, this suggests that aura may have lasting effects on cognition.
Cognition in chronic migraine
As mentioned before, migraine attack frequency has been shown to correlate with cognitive performance in EM, particularly in executive functioning, visual short-term memory, and attention [68, 69]. Since cognitive impairment is the second largest cause of episode-related disability after pain, understanding how it evolves with migraine chronification is crucial [13].
While global cognitive assessments suggest that some CM patients show cognitive deficits, findings are inconsistent [35, 70, 71]. Nevertheless, CM patients have demonstrated poor performance on individual components compared to healthy controls and EM patients [71], suggesting that a more nuanced view of assessing individual cognitive domains may provide a more detailed understanding of how cognition differs in CM.
Interest in decision-making and reward prediction in CM has partially stemmed from the prevalence of medication overuse headache (MOH) among this population [72]. Despite hypotheses of impaired performance in CM-MOH patients, studies utilising the Iowa Gambling Task, which simulates risk-taking during decision-making, found no significant differences when comparing HCs and EM patients [73, 74]. While one more extensive study did identify a substantial deficit in decision-making versus HCs, following MOH treatment with detoxification (protocol not specified), scores remained significantly lower despite Migraine Disability Assessment questionnaire (MIDAS) improvement [75, 76]. Thus, impaired decision-making in CM appears unrelated to the presence of MOH, although studies are limited. There is greater consistency of evidence for impaired cognitive flexibility in CM. CM patient performance is worse than that of HCs and EM in the Wisconsin Card Sorting Task [73, 77, 78], most commonly in the number of categories completed. A second task-switching paradigm complements these findings, indicating worse performance than HCs and low-frequency EM [79], suggesting executive functioning is impaired in CM, more so than in EM patients. Evidence does not support a more significant impairment in CM with MOH versus without [73], although sample sizes are small. Additionally, the Tower of London test provides evidence of impaired planning compared to HCs [74, 80, 81], although contradictory findings exist [74, 80, 81].
Inconsistency in cognitive assessment and continued medication use, as preventives and abortive drugs, limits the coherence of findings. Working memory deficits identified in the forward DST [35, 81] are influenced by medication use [35], which may contribute to contradictory findings [79, 82]. Similarly, performance deficits have been identified in the Rey-Auditory Verbal Learning test; however, they only occur in the number of words learned [70]. When reporting only an overall score, no significant difference was found when comparing CM to HCs [35]. Further assessments of memory in CM patients have reported deficits in delayed recall compared to HCs. However, there is no additional evidence assessing performance relative to EM patients [80, 81, 83]. Thus, while some evidence supports impaired memory in CM, variability in studies conducted to date precludes definitive conclusions.
As mentioned above, evidence supporting the deficit in selective attention and processing speed in CM is discrepant. While four studies identify significantly worse performance in either TMT A and/or B compared to HCs [71, 73, 78, 83], many show no difference [35, 80,81,82]. Comparisons between CM and EM are equally as varied [35, 71, 76, 81]. Nevertheless, performance in the Stroop test is consistently poor compared to HCs [35, 81], suggesting a potential selective attention impairment in CM individuals.
Few studies have assessed visuospatial processing and language, with two demonstrating visuospatial impairments [35, 80] despite inconsistency across individual tasks. One study documented reduced verbal fluency in CM vs. HCs [35], but this has not been replicated. Further studies across a broader range of cognitive domains are required to provide a complete understanding of cognition in CM.
Social cognitive assessments indicate CM patients may have difficulty recognising or describing emotions. Three studies reveal greater alexithymia in CM versus HCs in the Toronto Alexithymia Scale, in both total score and factor 1, which assesses difficulty identifying feelings [84,85,86]. Despite consistently higher CM scores, there are no firm conclusions when comparing CM to EM [84, 85]. Further emotional cognition deficits were seen in various tests compared to HCs [78, 81, 85, 87] and, in some cases, versus EM. Social cognition is impaired in CM, potentially impacting social interactions and QoL [83, 85].
CM is associated with increased co-morbidities such as depression and anxiety [15, 88,89,90], which are also linked to cognitive dysfunction [15, 88,89,90] and, therefore, may contribute to the cognitive deficits seen in CM. One study stratified CM patients and showed those with normal mood still performed worse than HCs in ROCF-m but not TMT-A or B [83]. Similarly, several studies showed no significant effect of depression and anxiety on cognitive performance [35, 70, 85]. Thus, while the increasing prevalence of co-morbidities may be a contributing factor to cognitive impairment, it is not the sole factor.
Overall, evidence of worsening cognitive performance with CM is mixed, although there are indications of deficits in executive function, social cognition and potentially in selective attention and delayed recall compared to HCs. Comparisons between CM and EM are limited and incongruous, often confounded by contradictory evidence on whether EM patients differ from HCs. Migraine frequency and severity likely contribute to this discrepancy. Hypotheses of worsening cognitive performance with migraine chronification [35, 71, 76, 81] are supported by studies that find significantly poorer cognitive performance in CM patients compared to EM [79, 84, 85], which is particularly highlighted by a single study which reports significant differences between CM and low-frequency, but not high-frequency EM [79, 84, 85], however, greater scrutiny in this area is required [59, 61, 66, 69, 71, 74, 75] (Fig. 3). Recruitment of participants exclusively from neurology clinics may generate selection bias towards more severe cases, limiting generalisability. Low sample sizes, varying treatment regimes, and inconsistency in test batteries further constrain reproducibility. Consequently, further research, including longitudinal studies, is required to clarify the impact of CM on cognition and assess cognition during migraine chronification.
Summary: Chronic migraine patients seem to show deficits in executive function, social cognition, and attention; however, longitudinal studies are missing to clarify the impact of CM and how chronification influences cognitive performance (See Fig. 2).
Fig. 2
The alternative text for this image may have been generated using AI.
Migraine subtypes and cognition model - a relationship between “chronification” and cognitive performance seems to exist, but still no evidence supports it. (Created with BioRender.com)
Preventive migraine treatment and its impact on Cognition
Migraine treatment can be divided into acute and preventive treatment. Topiramate, a preventative treatment, is known to cause dose-dependent cognitive side effects, including attention deficits, psychomotor slowing, and language and comprehension difficulties [91]. While migraine patients tend to have fewer cognitive complaints than epilepsy patients, drop-out complaints in topiramate trials mainly surround memory and concentration deficits [92].
Pregabalin, another preventative treatment, negatively affects cognition, especially visuospatial memory, processing speed, and attention [83]. Tricyclic antidepressants, such as amitriptyline, show an overall detrimental effect on cognition due to their anticholinergic and antihistaminic properties, which primarily affect attention, decision-making, and psychomotor speed [91]. A prospective study concerning the cognitive effects of onabotulinum toxin A treatment that included 60 patients noticed an improved cognitive score at 3 and 6 months, independent of improvement in headache frequency or intensity [93].
Regarding more recent migraine treatments, no cognitive side effects have been reported for anti-CGRP monoclonal antibodies and “gepants”, and a possible neuroprotective role is being debated [91]. Torrisi and colleagues studied the efficacy of erenumab, an anti-CGRP treatment, on cognitive performance and psychological well-being in migraine patients, comparing MoCA and Short Form Health Survey 36 (SF-36) scores at baseline and follow-up. Improvement in both cognitive performance and QoL was seen, postulating that effective preventive treatment could improve cognitive performance [31]. Additionally, lamotrigine, duloxetine and venlafaxine show a possible neuroprotective effect with improvement of cognitive performance [91].
In terms of acute treatment, triptans can impair cognition with known global amnesia-like symptoms due to vasoconstriction and transient ischemia [91]. However, two small studies evaluated cognitive symptoms during an acute attack and following sumatriptan administration. No restored cognitive performance after sumatriptan administration was seen [22]. Regarding ditans, selectively 5-hydroxytryptamine receptor 1 F (5-HT1F) receptor agonists, a study enrolled in healthy volunteers showed that lasmiditan impaired simulated driving performance around 1 h after administration, showing a possible central effect of this drug [94]. Less specific, acute treatments such as non-steroidal anti-inflammatory drugs (NSAIDs), may have a neuroprotective role due to their mechanism of action as an anti-inflammatory drug [91].
An open-label clinical study of the impact of donepezil as a migraine preventive treatment showed that donepezil was effective in both EM and CM. This may be due to a possible cholinergic dysfunction in migraine. This supports that cognitive performance could be impaired because of dysfunctional cholinergic activity in the cortex [22].
As it has been evidenced that migraine medication can affect cognition, this is a key confounding factor that should be considered when assessing cognitive performance in migraine patients. Many studies fail to control for this, potentially contributing to the lack of consistency in findings.
Summary: We need to be aware that preventive treatment could influence cognitive performance and this fact is a confounding factor when assessing cognitive function in migraine patients.
Migraine comorbidities and cognition
While cognitive impairment is evident in migraine, it should be considered that several of the most common migraine co-morbidities include multiple disorders known to be associated with cognitive dysfunction. These include certain psychiatric, neurological, vascular, and metabolic disorders.
Epilepsy has well-documented links with both migraine [95] and cognitive dysfunction [96]. The frequency of migraine among epileptic patients is at least two-fold higher than in the general population (1–17% vs. 0.5-1%) [93]. Cognitive impairment can occur in nearly 70–80% of epileptic patients throughout their lifetime [97]. Although the clear mechanism is unknown, cognitive impairment in epilepsy is likely due to a combination of factors, such as treatment side effects, psychosocial consequences, and structural brain deficits [97]. Although the literature on the topic is scarce, one study specifically explored cognitive performance in focal epilepsy patients with and without migraine. Memory scores were found to be significantly lower in patients with co-morbid migraine. However, higher depression and anxiety scores among these patients may also contribute to this relationship [96].
Depression is 2.5 times more prevalent among migraine patients than in the general population [98]. Major depressive disorder has an established link with cognitive dysfunction, with diminished ability to think and concentrate being one of the core symptoms [99]. It was found that cognitive deficits in patients with depression can persist after effective treatment, which is especially concerning migraine patients because depressive symptoms have been reported in around 40% of the patients during their lifetime [99, 100]. Although a direct link has not yet been established, psychiatric conditions such as depression and anxiety are highly prominent in migraine patients [101]. They are also known to be associated with worse cognitive performance as well as worse pain severity, and poor sleep quality [22].
Cognitive impairment is frequently discussed in other chronic pain conditions, such as fibromyalgia [102]. One of its characteristics is a so-called ‘fibro-fog,’ described as forgetfulness, concentration difficulties, and mental slowness [102, 103]. Cognitive dysfunction has been linked to pain intensity [102, 103], suggesting pain-symptomatology, rather than migraine directly, may underlie the cognitive impairment seen in patients and across other chronic pain disorders [102, 103]. However, psychiatric comorbidities such as depression and anxiety, also prominent in migraine, are widely recognised as impactful in cognitive impairment, based on previous studies where the cognitive function was worse in fibromyalgia patients exhibiting more severe depression and anxiety symptoms [104]. This is also supported by meta-analysis data on cognitive impairment in fibromyalgia, where cognitive function was statistically significantly associated with depression and anxiety scores [105]. Future studies should assess if a similar relationship exists for migraine.
Migraine as a neurovascular disorder [106] has an established link to other cardiovascular diseases, such as ischemic stroke, with a 2-fold higher risk among migraine patients [107]. In addition, as previously described in this review, WMLs of presumed vascular origin [108] are often found in migraine patients’ brain MRIs. As WMLs are themselves associated with cognitive impairment, it is important to consider vascular comorbidity as a possible explanation for decreased cognitive function in migraine patients. Risk factors for all-etiology dementia include multiple cardiovascular factors, including type 2 diabetes, hypercholesterolemia, and obesity [109]. Migraine has been reported to even further exacerbate the risk for cerebrovascular diseases [110], suggesting a potential mechanism of cognitive decline in individuals with migraine via increased prevalence of cerebrovascular events that are known to perturb cognitive performance [111].
Additionally, migraine has been associated with various metabolic disorders [98], such as hypothyroidism, which is more prevalent in CM than in EM patients. Even at subclinical levels, this condition is associated with mild cognitive impairments in memory and executive function [112]. Insulin resistance has also been described as more prevalent in CM patients than in EM patients [113]. Insulin resistance is recognised as one of the risk factors for dementia, with a significant association between cognitive function and baseline hyperinsulinemia, as well as metabolic syndrome and insulin resistance [113,114,115]. However, the effect of metabolic irregularities on migraineurs in the scope of cognitive performance has not been widely studied. Thus, to fully understand the relationship between migraine and cognitive impairment, it is necessary to consider co-morbidities as potential confounders that may contribute to cognitive test scores.
Summary: Migraine is often linked to other neurological and psychiatric disorders, such as Depression and anxiety, that have a well-documented association with cognitive impairment.
Cognitive impairment and disability in migraine
Estave et al. conducted interviews with migraine patients to assess how migraine affects daily life. Over 90% of patients reported a negative overall impact on daily life, whereas only 14% described cognitive impairment regarding concentration and communication difficulties [116].
Gil-Gouveia et al. [4] assessed how cognitive symptoms affect patients during migraine attacks. Each reported attack-related symptom was evaluated using the Visual-Analog Scale (VAS) to estimate two factors: symptoms’ intensity and perceived disability. Besides typical migraine features, patients also evaluated cognitive symptoms, such as thinking difficulties and overall worsening of cognitive symptoms with mental effort. Additionally, each patient was assessed by the SCI scale for migraine (Mig-SCog) and HIT-6. The final analysis showed that the occurrence of cognitive symptoms was highly correlated with attack-related disability. Furthermore, pain was the only symptom that proved to be more burdensome than cognitive dysfunctions [4].
Gómez-Beldarrain et al. assessed cognitive reserve in EM, CM-MOH, and HCs [117]. Cognitive reserve can be considered as the brain’s capacity for problem-solving and adaptation. Using multiple questionnaires, migraine patients were found to have a lower cognitive reserve than HCs, with the lowest cognitive reserve found in the CM-MOH group. Furthermore, lower CR scores were correlated with worse QoL outcomes [117].
Conversely, Qin et al., assessed headache disability and cognitive functions using MIDAS, HIT-6, and the MoCA test [33]. The results showed a higher prevalence of cognitive impairment in the migraine patient population compared to HCs. However, no correlation between cognitive impairment and the QoL was found [33].
Nevertheless, it was suggested in several studies that cognitive symptom relief should be implemented as one of the endpoints in future clinical trials for anti-migraine drugs [4, 33, 118]. A pilot study was conducted to assess erenumab’s ability to improve cognitive and psychological functions in CM patients [31]. Subjects were examined with several diagnostic tools such as MoCA, MIDAS, SF-36, Beck’s Depression Inventory, and the Hamilton Anxiety Rating Scale [31]. Daily erenumab dosing resulted in higher MoCA scores in the three subscales of SF-36 (pain, general health, energy/fatigue) [31]. An improvement in MIDAS was also observed; nonetheless, the change was not statistically significant [31]. Thus, cognition should be considered as a potential metric for treatment efficacy due to the potential detrimental impact of cognitive impairment on QoL and the potential for appropriate treatment to reduce cognitive symptoms.
Summary: Not only do headaches impact daily life, but cognitive symptoms related to migraine attacks also have a negative effect, especially in patients with lower cognitive reserve. These findings indicate that cognition should be considered a potential outcome metric for treatment efficacy.
Conclusion
Cognitive impairment appears predominantly in the headache phase itself. However, there remains a lack of certainty as to whether cognitive impairment extends into the interictal period in EM patients. In CM, evidence supports cognitive impairment on both migraine and non-migraine days, suggesting that cognitive impacts may be more persistent as migraine frequency increases and interictal days decrease, with considerable impacts on social cognitive domains. Further research to assess whether poor cognitive performance persists throughout migraine phases or worsens with migraine chronification is required. Such insight may be instrumental in defining cognitive symptoms as a key factor that should be considered in patient care.
It is yet to be determined whether cognitive impairment is a phenotype specific to migraine or an effect seen in broader pain-related disorders. Furthermore, there is evidence that specific co-morbidities, such as anxiety and depression or treatments, may influence worsening cognition. Thus, it is likely that a combination of factors contributes to poor cognitive performance in migraine patients. To address these remaining questions, future studies should consider a longitudinal study design to assess cognitive function across different migraine phases and across periods of migraine chronification. Use of acute and preventative therapies should be considered an important confound in such studies. Additionally, comparison of migraine patients to patients with other primary headache or pain disorders would be informative to determine which cognitive changes may be directly associated with migraine, and which may be triggered more broadly due to pain.
Data availability
No datasets were generated or analysed during the current study.
Abbreviations
HCs:
Healthy controls
CEN:
Central executive network
CVLT:
California Verbal Learning Test
DMN:
Default mode network
DST:
Digit span tests
EEG:
Electroencephalography
fMRI:
Functional MRI
HIT-6:
Headache Impact Test-6
MIDAS:
Migraine Disability Assessment questionnaire
Mig:
SCog-SCI scale for migraine
MMSE:
Mini Mental State Examination
MoCA:
Montreal Cognitive Assessment test
MOH:
Medication overuse headache
MRI:
Magnetic resonance imaging
MSQoL:
Migraine-Specific Quality of Life
MwA:
Migraine with aura
MwoA:
Migraine without aura
QoL:
Quality of life
CERN:
Right CEN
ROCF:
m-Rey Complex Figure test
SCI:
Subjective cognitive impairment
SDST:
Symbol Digit Substitution Task
SF-36:
Short Form Health Survey 36
SN:
Salience network
TMT:
Trail Making Test
WML:
White matter lesions
5-HT1F:
5-hydroxytryptamine receptor 1 F
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Acknowledgements
On behalf of the European Headache Federation School of Advanced Studies (EHF-SAS)
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Antoinette MaassenVanDenBrink and Christian Lampl contributed equally to this work.
Authors and Affiliations
Neurology Department, Local Health Unit of Coimbra, Coimbra, Portugal
Catarina Fernandes
Centre of Neurology, Vilnius University, Vilnius, Lithuania
Austeja Dapkute
Headache Group, Wolfson Sensory, Pain and Regeneration Centre, Institute of Psychiatry, Psychology and Neuroscience, King’s College London, London, UK
Ellie Watson & Veronica Munday
Department of Nervous and Neurosurgical Diseases, Belarusian State Medical University, Minsk, Belarus
Irakli Kazaishvili
Department of Neurology, Faculty of Medicine and Dentistry, Medical University of Warsaw, Bielański Hospital, Warsaw, Poland
Piotr Chądzyński
Neurology Department, Hospital de Braga, Braga, Portugal
Sara Varanda
Department of Health Science and Technology, Center for Pain and Neuroplasticity (CNAP), SMI, School of Medicine, Aalborg University, Aalborg, Denmark
Stefano Di Antonio
Department of Neuroscience, Rehabilitation, Ophthalmology, Genetics and Maternal Child Health, University of Genoa, Genoa, Italy
Stefano Di Antonio
Department of Neuroscience, Rehabilitation, Ophthalmology, Genetics and Maternal Child Health, Erasmus University Medical Center, Rotterdam, The Netherlands
Antoinette MaassenVanDenBrink
Department of Neurology, Headache Medical Center, Linz, Austria
Christian Lampl
Consortia
On behalf of the European Headache Federation School of Advanced Studies (EHF-SAS)
Contributions
All authors on behalf of the European Headache Federation contributed equally to the drafting and critical revisions of the manuscript. C.F. took the lead in conceptualising, writing, drafting and revising the manuscript. A.M and C.L. review the main manuscript text, figures and additional material. All authors reviewed the last version of the manuscript and have agreed to be personally accountable for their own contributions.
Corresponding author
Correspondence to Catarina Fernandes.
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Competing interests
Intellectual Christian Lampl is the Director of the School of Advanced Studies of the European Headache Federation and associate editor for The Journal of Headache and Pain. Antoinette Maassen van den Brink is the President of the European Headache Federation. The other authors declare no competing interests.
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Fernandes, C., Dapkute, A., Watson, E. et al. Migraine and cognitive dysfunction: a narrative review. J Headache Pain 25, 221 (2024). https://doi.org/10.1186/s10194-024-01923-y
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27 October 2024
Accepted
19 November 2024
Published
19 December 2024
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19 December 2024
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https://doi.org/10.1186/s10194-024-01923-y
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