If an endometrial thickness of more than 8 mm is deemed abnormal, 0.9 percent of women without cancer and without bleeding, 12 percent of women without cancer and with bleeding, and 95 percent of women with cancer will have endometrial measures over this threshold. Women with a history of breast cancer have a higher risk of developing new cases of ovarian cancer. As such, all women with a history of breast cancer require monitoring for ovarian cancer symptoms even after they have been treated for their breast cancer. Thickened uteruses are associated with increased risks of developing cancers of the uterus (endometrium). Endometrial cancer is the most common gynecologic cancer in the United States. It is rare before the age of 40 but increases with age; it is more common in white women than black women. Most women feel mild pain during their menstrual periods but may also experience severe cramping and heavy bleeding. The pain can be relieved by lying down or standing up and often goes away on its own without special treatment. Women who experience irregular menses or menopause-related symptoms should seek evaluation by their doctor. Endometrial cancer usually occurs after the age of 60 but can develop at any age.