Hormonal changes
Some women experience episodes of migraines around the time of their menstrual period, possibly because of the hormonal changes such as estrogen drop around this time.
These types of migraine attacks are called pure menstrual migraine, and they usually occur 2-3 days before the start of your menses or three days after. Women who only experience migraines around this time do not need definitive treatment as it settles down when hormone levels become balanced.
Many women find their attacks of migraines improve after the cessation of menses (menopause), although some studies suggest that menopause can trigger migraines in some women.