Birth control pills reduce the risk of ovarian cancer, especially among women who use them for 5 years or more. These women have about half the risk of getting ovarian cancer compared with women who never used the pill.
Birth control pills can prevent ovarian cancer. We think that one of the mechanisms that women are at risk for ovarian cancer is constant ovulation. In other words, ovulation that is never interrupted with a pregnancy or medications. All birth control, including pills, patches, injections and rings can all achieve the same protection by stopping ovulation. The longer that you stay on birth control pills, the more protection you get.