Ovarian cancer affect the ovaries, the female reproductive organs in the pelvis that makes hormones and stores eggs. Most cases of ovarian cancer occur in women over 50 and it causes more deaths than any other cancer of the reproductive system. Though challenging, early detection of ovarian cancer is the key to a successful treatment program. Ongoing pain, cramps and pressure in the abdomen can be a symptom of ovarian cancer. It can also be a symptom for ovarian cysts, which can affect women by causing pain in the abdomen, but are not directly related to ovarian cancer in most women. Browse the topics below for more information about ovarian cancer from www.womenshealth.gov.