<qa>  What is the most common cause of migraine in women?During the fertile ages, migraine is more common in women than in men 3:1. Hormonal factors has been proposed to affect this difference and it has been shown that a rapid decrease in serum concentrations of estrogens might trigger an attack.About 15 percent of all women with migraine suffer from menstrual migraine which means that the attacks only come during the menstrual period and start - 24 hours of the bleeding start, i.e when there is a rapid decrease in serum concentrations of sex hormones. 