1School of Medicine, China Medical University, Taichung, Taiwan 2Bo-Zhi Neurology Clinic, Taichung, Taiwan 3Department of Neurology, China Medical University Hospital, Taichung, Taiwan 4School of Medicine, National Yang-Ming University, Taipei, Taiwan 5Brain Research Center, National Yang-Ming University, Taipei, Taiwan 6Department of Neurology, Neurological Institute, Taipei Veterans General Hospital, Taipei, Taiwan
Shuu-Jiun Wang
Roles:
Conceptualization,
Supervision,
Writing – Review & Editing
OPEN PEER REVIEW
REVIEWER STATUS
Abstract
Migraine is one of the most common neurological disorders. In addition to severe headaches, non-headache symptoms associated with migraine attacks as well as co-morbid disorders frequently aggravate the disabling of migraine patients. Some of these symptoms are related to poor outcomes. In this review, we update the advances of studies on certain non-headache symptoms, including visual disturbance, gastrointestinal symptoms, allodynia, vestibular symptoms, and symptoms of co-morbid restless legs syndrome and psychiatric disorders.
Keywords
migraine, visual disturbance, allodynia, restless legs syndrome, depression
Corresponding author:
Shuu-Jiun Wang
Competing interests:
No competing interests were disclosed.
Grant information:
This study was supported in part by grants from Brain Research Center, National Yang-Ming University and Ministry of Health and Welfare, Taiwan [MOHW 105-TDU-B-211-113-003, MOHW 106-TDU-B-211-113001].
The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.
Migraine is a very common neurological disorder characterized by recurrent episodes of disabling headache. In addition to headaches, there are many different non-headache symptoms during or between migraine attacks. These non-headache symptoms of migraine also impact patients’ daily activities as well as their quality of life. In this brief review, we focus on the recent findings of several common non-headache symptoms of migraine, including visual disturbance, gastrointestinal symptoms, allodynia, vestibular symptoms, and symptoms of co-morbid restless legs syndrome (RLS) and psychiatric disorders. Of note, there are a variety of other symptoms, such as phonophobia, neck pain, cognitive dysfunction, and fatigue, which are not discussed in this review.
Visual disturbance
Visual disturbance is common in patients with migraine. It is an important premonitory symptom: 32% of patients experience light sensitivity and 21% have difficulties in focusing vision1. Photophobia and visual aura are two major types of visual disturbance. Photophobia is more persistent, whereas visual aura is more transient and discrete. In fact, photophobia may begin in the premonitory phase and persist throughout the migraine attack. Up to 80% of migraine patients have experienced photophobia during an attack2. In addition, visual aura is the most common aura and usually occurs in isolation, whereas the other forms of aura usually occur with visual symptoms3. Actually, different types of aura, which may reflect the activation of different parts of the brain (for example, visual and sensory aura), could start at the same time or in succession4. In a Brazilian study on 122 migraine with aura patients, the most common visual symptoms were blurred vision (54.1%) and small bright dots (47.5%), whereas the frequencies of classic zigzag or jagged lines and the typical “C” crescentic shape were 41.8% and 16.4%, respectively5. Hansen et al. analyzed more than 1,000 attacks of migraine aura without headache in a single patient for 18 years. The classic aura initially propagated predominantly in the central visual fields and then spread to upper and temporal fields on both sides6. They also found that the visual auras disappeared for several minutes before reappearing in a distant location. In this patient, the auras propagating from V1 to V2 regions of the occipital cortex were suspected to correspond to the visual percept from a scintillating wave to a scotoma6.
Visual snow is very rare and is described as a persistent disturbance in the entire visual field similar to the noise of an analogue television. It is frequently reported to be persistent at all times when eyes are both open and closed. Patients with visual snow were often diagnosed as having persistent visual aura. However, visual snow is frequently concomitant with migraine but usually not responsive to standard migraine treatment7. In addition, patients with visual snow comorbid with migraine frequently have other visual symptoms such as photopsia, nyctalopia, and palinopsia7,8. In an [18F]-flurodeoxyglucose PET study, hypermetabolism of the right lingual gyrus and the anterior lobe of the left cerebellum were noted in patients with visual snow but not seen for interictal migraine patients alone7. Schankin et al. suggest that visual snow is a unique visual disturbance, distinct from migraine with aura. However, the pathophysiology may be associated with migraine as well8.
Gastrointestinal disturbance
Gastrointestinal symptoms are common accompanying symptoms of migraine. Nausea occurs in 70–80%9,10 and vomiting in 30% of migraine patients2. Anorexia is also common in migraine patients. However, because of the different study methods, the frequency of anorexia is variable from less than 20 to more than 82%11–13. In addition, migraine patients experienced delayed gastric emptying during and outside of a migraine attack14,15. The head-HUNT study in Norway showed that gastrointestinal complaints increased with increasing headache frequency, including migraine16. In a recent report of the American Migraine Prevalence and Prevention (AMPP) study, persistent frequent headache-related nausea, defined as nausea frequency of more than 50% within 2 years, was common (43.7%) among subjects with episodic migraine. Migraine patients with frequent nausea were twice as likely to progress to chronic migraine (CM) compared to those with no or a low frequency of nausea17. Autonomic nervous system dysfunction is suspected to be related to migraine patients with gastrointestinal symptoms18,19. In one PET study, activation of the rostral dorsal medulla and periaqueductal gray was noted in patients with nausea as a premonitory symptom20. Anorexia is a major symptom of abdominal migraine, a variant of migraine with recurrent abdominal pain, mainly in children. About 70% of them develop migraine in adults. Abdominal migraine can persist into adulthood in some patients21.
Allodynia
Allodynia is a painful sensation caused by innocuous stimuli, such as light touch, brushing hair, wearing glasses, and so on. It was reported in 70% of episodic migraine and in 90% of CM patients22,23 and was associated with anxiety, depression, and disability24. The risk factors of allodynia in migraine patients included obesity, high frequency of headache, and female gender25. Allodynia usually develops within a few hours after migraine attack and is associated with inconsistency of response to triptans from one attack to another within patients26. The AMPP study showed that allodynia was associated with a lower efficacy of acute medications27,28.The poor and inconsistent response to triptans and other abortive medications is explained by the fact that allodynia is the clinical manifestation of central sanitization29,30. The activation of second-order neurons in the brainstem, particularly the trigeminal nucleus caudalis, is related to cephalic allodynia. If the allodynia is noted in other sites outside of the head, sensitization of the third-order trigeminal neurons in the posterior thalamic nuclei is suspected23,26,31.
Two blood oxygen level-dependent (BOLD)-fMRI studies demonstrated abnormal activations in migraine patients with allodynia32,33. However, the activation sites were not consistent. In one study, the activation of the dorsal pons and contralateral inferior parietal lobule were lower in migraine patients with allodynia32. In the other study, greater activation at the anterior cingulate cortex and middle frontal gyrus was observed in migraine patients with allodynia during moderate-noxious trigeminal heat stimulation (51°C) but lower activation in the secondary somatosensory cortices was seen during high-noxious trigeminal heat stimulation (53°C)33. The authors suspected a dysfunctional analgesic compensatory mechanism and an abnormal internal representation of pain in migraine patients with allodynia32,33. Very recently, a PET study with [11C] raclopride found that there is a transient dopamine reduction in the striatum region during migraine attacks and allodynia. However, a relatively sudden increased dopamine release in the insula was noted during allodynia, the late stage of migraine attack. The authors suspected that the reduction and imbalance of dopamine between striatum region and insula account for the pathogenesis of the allodynia34.
Schwedt et al. showed that, in addition to allodynia during migraine attack, low heat pain thresholds between migraine attacks were found in migraine patients and the thresholds were positively correlated with the number of hours until the next migraine attack. The authors suspected that the lowered pain threshold was an early sign of a migraine attack35. Similar findings were also found in a small-sized study: the lower pain thresholds were detected during the pre-attack phase of migraine but not during the interictal period36.
Vestibular symptoms
About 30–50% of migraine patients report vertigo, dizziness, or balance disturbances associated with migraine attack37–39. The frequency of vestibular symptoms is much higher in patients with migraine than in those with other headache types40,41.
Several terms have been used to describe vertigo occurring with migraine. The term “vestibular migraine” was co-defined by the International Headache Society and Barany society. The criteria for vestibular migraine are listed in the Appendix of International Classification of Headache Disorders, third beta edition42. Both migraine and vestibular symptoms are very common in the population and therefore co-existence is possible. It is important to note the similarity of migraine with brainstem aura and vestibular migraine. In migraine patients with brainstem aura, vertigo is one of the aura symptoms. Of note, at least two aura symptoms of brainstem origin are necessary to make the diagnosis of migraine with brainstem aura, including dysarthria, vertigo, tinnitus, hypacusis, diplopia, ataxia, and decreased level of consciousness. The auras should be accompanied or followed by the headache within 60 minutes42. The diagnosis of vestibular migraine requires the exclusion of other potential causes of the vestibular symptoms. It usually consists of a detailed history of both headache and vestibular components in addition to potential testing, such as imaging and audiometry. The auditory symptoms, such as hearing loss, tinnitus, and aural pressure/fullness, are common but usually mild in vestibular migraine patients43,44.
The vertigo symptoms vary in patients with migraine. They can occur spontaneously without any trigger or may be provoked by positional change45. The frequency of spontaneous vertigo seems to be much higher than positional vertigo in patients with vestibular migraine45. In a recent study with a nine-year follow-up, the accompanying vertigo could be persistent during migraine attacks, which caused a severe impact on quality of life. The authors also reported increased interictal ocular motor abnormalities from 16 to 41% at follow-up43.
The pathophysiology of vestibular migraine is still unclear. The activation of vestibular and cranial nociceptive pathways at the same time was suspected to be one possible cause. Recently, several neuroimaging studies support the possibility. One whole-brain BOLD-fMRI study showed abnormal thalamic functional response to vestibular stimulation in patients with vestibular migraine46. In a recent MRI study for structural changes, increased gray matter volume of the left thalamus, left temporal lobe, frontal lobe, and occipital lobes as well as decreased gray matter volume of the left cerebellum were found in patients with vestibular migraine compared to migraine patients without vestibular symptoms47. During the attacks of vestibular migraine, flurodeoxyglucose PET scans demonstrated increased metabolism in the temporo-parieto-insular areas and bilateral thalamic regions. The finding indicates activation of the vestibulo-thalamo-cortical pathway48.
There are only a few studies focusing on the treatment of vestibular migraine49. Patients are often treated with typical migraine prophylaxis. Zolmitriptan was reported to be better than placebo during acute attack of vestibular migraine50. In addition, flunarizine was shown to be an effective preventive agent for vestibular migraine51.
Actually, vertigo is very common in the general population52. The associations between migraine and benign paroxysmal positional vertigo (BPPV) have been reported. One study revealed that migraine was three times more common in patients with BPPV than in the general population53. Another population-based study in Taiwan showed that patients with migraine had a 2.03-fold increased risk of developing BPPV compared with the control group54.
Restless legs syndrome
The relationship between migraine and sleep has been known for more than a century55. Sleep disturbance is not only a common complaint of migraine patients but also a trigger of migraine attack56. There is accumulating evidence to show that RLS, an important cause of sleep disturbance, is one of the comorbidities of migraine57–64. Some similarities are noted between migraine and RLS—e.g. female predominant, episodic attacks, and fluctuations in levels of certain biogenic amines during attacks—and are postulated as crucial factors in the pathophysiology65–67. The frequency of RLS in migraine patients is variable (about fourfold increased odds compared to healthy controls); however, it is lower in Asians but higher in non-Asians. The frequency of RLS in migraine patients did not differ between genders or those with and without aura57–64.
The pathophysiology of the association is still unknown. However, some clinical findings provide clues. A recent study of a temporal relationship between migraine and RLS attacks showed bidirectional triggering association between migraine and RLS attacks in migraine patients with comorbid RLS68. In addition, migraine patients with RLS were more likely to have photophobia, phonophobia, exacerbation due to physical activities, vertigo, dizziness, tinnitus, and neck pain57. The results suggest that migraine severity is related to RLS frequency and explain the reason why the propensity of RLS is higher in clinic-based studies as compared to community studies57–64. Valente et al. reported a higher familial predisposition to serotoninergic drugs in migraine patients with RLS69. In a genetic study, Fuh et al. demonstrated that MEIS1 variants, a known gene for RLS alone, are also associated with an increased risk of RLS in migraine patients70. All of these reports hint that the balance of dopaminergic and serotoninergic systems could be crucial in the association between migraine and RLS.
Psychiatric disorders
Migraine is comorbid with many psychiatric disorders71. Of them, depression, bipolar disorder, and anxiety disorder are common and cause disability in affected patients72.
Depression
Epidemiology studies demonstrate that migraine subjects are at two- to fourfold increased risk of developing lifetime major depression in comparison with subjects without migraine73–75. The association is stronger in migraine with aura than in migraine without aura76,77. In addition, CM patients had a higher risk of depression as compared to patients with episodic migraine78,79.
The pathophysiology of this comorbid association is not known, but genetic factors, serotonergic dysfunction, ovarian hormone influences, and hypothalamic-pituitary adrenal axis dysregulation are suspected to be involved long term80. Lirng et al. recently measured brain metabolite concentrations, including myo-inositol (mI) and total creatine (tCr), by MR spectroscopy. They demonstrated that migraine patients with major depression had higher mean mI:tCr ratios in the left and right dorsolateral prefrontal cortex compared to migraine patients without major depression81.
Bipolar disorder
Migraine patients are reported to have a higher risk of comorbid bipolar disorder82–84. Bipolar patients are also reported to have a higher frequency of migraine, particularly among bipolar disorder II subjects85. Of note, bipolar disorder relative risk is increased to 3.88 in CM compared to normal controls and 1.81 compared to episodic migraine86. In addition, patients comorbid with migraine and bipolar disorder seem to be more likely to have a rapid cycling illness course87,88.
Anxiety
The prevalence of anxiety is about two to five times higher in patients with migraine than in the general population89. Similar to other psychiatric comorbidities, anxiety is much more common in CM patients than in those with episodic migraine90. Alessandra et al. recruited 1,261 migraine patients in Brazil and classified them into four groups based on migraine frequency. In comparison with controls, the migraine patients had a higher risk of generalized anxiety disorder and the risk increased with headache frequency. Similar comorbid associations were also noted in panic disorder and obsessive-compulsive disorder91. The risk of panic disorder was also reported to be 3.6 times higher in migraine patients in a meta-analysis from 1990–2012. The presence of panic disorder in migraine patients is associated with more frequent attacks, increased disability, a higher risk for chronification, and medication overuse92. In addition, osmophobia in migraine patients is reported to be associated with significant anxiety symptoms93.
Conclusions
Migraine is a disabling neurological disorder, not only because of the headaches. Many non-headache symptoms and comorbidities of migraine have a significant negative impact on patients’ quality of life. There are many more studies focusing on this issue. For better quality and strategy of migraine patients’ care, more studies need to be conducted to explicitly investigate these problems from a therapeutic point of view, given the clinical implications.
Competing interests
No competing interests were disclosed.
Grant information
This study was supported in part by grants from Brain Research Center, National Yang-Ming University and Ministry of Health and Welfare, Taiwan [MOHW 105-TDU-B-211-113-003, MOHW 106-TDU-B-211-113001].
The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.
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1
School of Medicine, China Medical University, Taichung, Taiwan 2
Bo-Zhi Neurology Clinic, Taichung, Taiwan 3
Department of Neurology, China Medical University Hospital, Taichung, Taiwan 4
School of Medicine, National Yang-Ming University, Taipei, Taiwan 5
Brain Research Center, National Yang-Ming University, Taipei, Taiwan 6
Department of Neurology, Neurological Institute, Taipei Veterans General Hospital, Taipei, Taiwan
This study was supported in part by grants from Brain Research Center, National Yang-Ming University and Ministry of Health and Welfare, Taiwan [MOHW 105-TDU-B-211-113-003, MOHW 106-TDU-B-211-113001].
The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.
Chen PK and Wang SJ. Non-headache symptoms in migraine patients [version 1; peer review: 2 approved]. F1000Research 2018, 7(F1000 Faculty Rev):188 (https://doi.org/10.12688/f1000research.12447.1)
NOTE: If applicable, it is important to ensure the information in square brackets after the title is included in all citations of this article.
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