Migraines are the number one side effect reported by women who use oral contraception. This is generally attributed to the fluctuation of estrogen levels in the body and occurs most frequently in women that are using combination estrogen-progestin pills. Although 20% of women who use contraceptives report migraine headaches, it can be difficult to diagnose the exact cause since women are more prone to migraine headaches and tend to fall into multiple risk profiles.
A study by the Harvard Medical School concluded that headaches that occur in the early cycles of contraceptive use tend to improve or disappear with continued use. The study also suggests that manipulating the extent or duration of estrogen withdrawal may provide some benefit as well.
If you believe that your migraine headaches are a side effect of oral contraceptives, then it is important that you consult with your physician to make sure that all of the risk factors are considered. You should also let your doctor know if you have a history of migraines prior to using any type of oral contraceptive. Many women who suffer from severe migraine headaches use not estrogen based forms of contraception.