Women’s migraine patterns often have their roots in monthly, hormonal fluctuations, where changes in body chemistry cause imbalances that result in headaches. Many women find headaches are worse either during, before, or just after their periods as it is during this time that estrogen levels dip. Some schools of thought assert that it is not the level of estrogen in the body that causes the headache, but rather the change in the estrogen/progesterone balance.