http://www.sirweb.org/patPub/uterine.shtml
Society of Interventional Radiology
Fibroid tumors of the uterus are very common, but for most women, they either do not cause symptoms or cause only minor symptoms. Fibroids can cause very heavy menstrual bleeding, clotting and pelvic pain, leading many women to seek treatment. Fibroids often fail to respond to medical therapy and then surgical procedures are often recommended.