Migraine headaches are more common in women. 60-70% of women with migraines notice a relationship with their menstrual cycle. There is usually an increased frequency around menstruation. A true menstrual migraine occurs every month, only between the 2nd day before menstruation and the end of menstruation. Menstrual migraine is estimated to occur in about 14% of women. This subcategory of migraine appears to be triggered by falling estrogen (estradiol) levels at the end of the menstrual cycle. Low doses of estrogen starting 1-2 days before menstruation, taken throughout the period, may help. This kind of migraine may be a problem when taking birth control pills.
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