Uterine fibroids are noncancerous growths of the uterus that often appear during childbearing years. Also called leiomyomas or myomas, uterine fibroids aren't associated with an increased risk of uterine cancer and almost never develop into cancer. Uterine fibroids are a common type of noncancerous tumor that can grow in and on your uterus. Not all fibroids cause symptoms, but when they do, symptoms can include heavy menstrual bleeding, back pain, frequent urination and pain during sex. There are several places both inside and outside of your uterus where fibroids can grow. The location and size of your fibroids is important for your treatment. Where your fibroids are growing, how big they are and how many of them you have will determine which type of treatment will work best for you or if treatment is even necessary.