Objective
Migraine is a common co-morbidity of bipolar disorder (BD), and is more prevalent in women than men. We hypothesized co-morbid migraine would be associated with features of illness and psychosocial risk factors which would differ by gender and impact outcome.
Methods
A retrospective analysis was conducted to assess association between self-reported, physician-diagnosed migraine, clinical variables of interest and mood outcome in subjects with DSM-IV BD (N=412) and healthy controls (HC, N=157) from the Prechter Longitudinal Study of Bipolar Disorder, 2005â2010. Informed consent was obtained from all participants.
Results
Migraine was more common in BD (31%) than HC (6%), and had elevated risk in BD women compared to men (OR 3.5, CI 2.1, 5.8). In men, migraine was associated with BPII (OR 9.9, CI 2.3, 41.9) and mixed symptoms (OR 3.5, CI 1.0, 11.9). Migraine was associated with an earlier age at onset of BD by 2 years, more severe depression (B =.13, p=.03), and more frequent depression longitudinally (B =.13, p=.03). Migraine was associated with childhood trauma (p<.02) and high neuroticism (p<.01), and protective factors included high family adaptability (p=.05) and high extraversion (p=.01).
Conclusion
Migraine is a common co-morbidity with BD and may impact long-term outcome of BD, particularly depression. Clinicians should be alert for migraine co-morbidity in women, and in men with BPII. Effective treatment of migraine may impact mood outcome in BD as well as headache outcome. Joint pathophysiological mechanisms between migraine and BD may be important pathways for future study of treatments for both disorders.