Menstrual Migraines: Diagnosis, Evidence, and Treatment.

"Menstrual" or "catamenial" migraine (MM) is separated into two categories in the International Classification of Headache Disorders pure menstrual migraine and menstrually-related migraine. Pure menstrual migraine is defined as a migraine occurring exclusively on day 1 ± 2 of menstruation in at least two out of three menstrual cycles and at no other time in the cycle. Menstrually-related migraine is defined as the same but may occur at other times in the menstrual cycle, not just around menstruation. The withdrawal of estrogen has been correlated with the onset of MM, providing an opportunity for specific treatment with hormone therapies. Traditionally, MM has been treated with nonspecific treatments such as abortive and prophylactic non-steroidal anti-inflammatory drugs and triptans. While this is first line, evidence suggests that nonspecific treatments can be used in combination with specific hormone treatments. The hormone treatment recommended is either continuous combined hormonal contraceptives (CHCs) with no placebo pills or using just two days of placebo pills to avoid the estrogen withdrawal trigger. Although MM with aura is uncommon, when referring to using CHCs for MM with aura, the U.S. Medical Eligibility Criteria for Contraceptive Use 2016 categorizes MM with aura as "A condition that represents an unacceptable health risk if the contraceptive method is used." Therefore, the current recommendation is not to use CHCs with a history of menstrual migraine with aura, especially when other risk factors such as smoking are present. Other treatments such as GnRH agonists, selective estrogen receptor modulators, and bilateral oophorectomy have limited evidence.