Fibroids are slow-growing, noncancerous growths in the uterus that consist of muscle and fibrous tissue. Their cause is unknown, although they are thought to be linked to the hormone estrogen, because they develop mainly during the reproductive years and shrink after menopause.
Small fibroids often do not cause symptoms. However, fibroids may grow very large and cause symptoms such as painful, heavy periods; abdominal pain; lower back pain; and frequent urination. Untreated, they may lead to infertility or cause problems during childbirth.
Small, symptomless fibroids may not need treatment. Larger fibroids may be treated with medication to shrink them. If medication proves ineffective, surgery may be recommended