Migraine in relation with endometriosis phenotypes: Results from a French case-control study.

Background: Studies have shown a significant association between migraine and endometriosis, but no study has explored the relationship between migraine and endometriosis phenotypes: Superficial peritoneal endometriosis, ovarian endometrioma, and deep infiltrating endometriosis.
Methods: We conducted a case-control study using data collected from 314 women aged 18 to 42 years who had undergone surgery for benign gynecological conditions between January 2013 and December 2015. All women completed a self-administered headache questionnaire according to the IHS classification. Cases (n = 182) are women with histologically proven endometriosis and controls are women (n = 132) without endometriosis. Occurrence of migraine was studied according to endometriosis phenotypes.
Results: Migraine prevalence in cases was significantly higher compared with controls (35.2% vs. 17.4%, p  = 0.003). The risk of endometriosis was significantly higher in migrainous women (OR = 2.62; 95% CI = 1.43-4.79). When we take into account endometriosis phenotypes, the risk of ovarian endometrioma and deep infiltrating endometriosis were significant (OR = 2.78; 95% CI = 1.11-6.98 and OR = 2.51; 95% CI = 1.25-5.07, respectively). In women with endometriosis, the intensity of chronic non-cyclical pelvic pain was significantly greater for those with migraine (visual analogic scale (VAS) = 3.6 ± 2.9) compared with the women without headache (VAS = 2.3 ± 2.8, p  = 0.0065).
Conclusion: Our study shows a significant association between migraine and endometriosis. In clinical practice, women of reproductive age who suffer from migraine should be screened for endometriosis criteria in order to optimise the medical and therapeutic care of this condition.