What makes a menstrual migraine different from other migraines
A menstrual migraine is not defined by how bad it feels. It is defined by when it arrives and what triggers it. The International Headache Society classifies it as a migraine occurring within the window of two days before menstruation to three days after it begins, in at least two out of three cycles. The trigger is not stress, not a skipped meal, not a change in sleep. It is a fall in oestrogen.
