Fibroid Tumors of the Uterus

An abnormal growth of cells in the muscular wall (myometrium) of the uterus. The term “fibroids” is misleading. The cells are not fibrous; they are composed of abnormal muscle cells. Uterine fibroids are common and almost always benign (not cancerous).

There are 3 major types of fibroids (determined by location in the uterus). Subserous appear on the outside of the uterus, intramural are confined to the wall of the uterus, and submucous appear inside the uterus. Rarely, fibroids can involve the cervix.


  • No symptoms (often). May be discovered on a pelvic examination.
  • Menstruation is more frequent with possibly heavy bleeding, occasionally with large clots and discomfort.
  • Bleeding between periods.
  • Feelings of pressure on the urinary bladder or rectum.
  • Anemia (weakness, fatigue and paleness).
  • Increased vaginal discharge (rare).
  • Painful sexual intercourse or bleeding after intercourse (rare).


Exact cause is unknown. Estrogen is required for their stimulation and growth, as fibroids are rare in prepubertal girls of postmenopausal women.


  • Use of oral contraceptives and estrogen replacement therapy as these may cause excessive growth of fibroids.
  • Genetic factors. Fibroid tumors are 3 to 5 times more common in black women than in Caucasian women.


Cannot be prevented at present, but avoiding the use of female hormones may decrease the risk of growth of fibroids.


  • If surgery is not necessary prior to menopause, these tumors usually decrease in size without treatment after menopause.
  • Hospitalization, if surgery is necessary. Fibroids are generally removed surgically when they cause excessive bleeding, produce symptoms that interfere with conception or pregnancy or if they become malignant (rare).
  • Fibroids can often be removed surgically without removing the entire uterus (mymectomy). The ability to conceive continues as long as the uterus remains.


  • Heavy bleeding and anemia.
  • Complications may occur in pregnancy such as spontaneous abortion (usually associated with the submucous fibroid type), premature labor(usually associated with large fibroids) and placental separation (abruption) may occur when the placenta overlies the fibroid. With a large fibroid, fetal growth may be at risk because blood flow is diverted from the fetus to the fibroid.
  • Fibroid may return following surgery to remove them.
  • Malignant change in the fibroid tumor (occurs in less than 0.5%).
    This rare complication is usually signaled by very rapid growth.


  • Diagnostic tests may include laboratory blood studies; ultrasound; laparoscopy (use of a telescope instrument with fiber optic light to examine the organs inside the abdominal cavity); hysteroscopy (the telescope instrument is inserted through the vagina to look inside the uterus); or hysterosalpingogram (studying the uterus and fallopian tubes by injecting material into the uterus that x-rays can detect).
  • Treatment will be individualized depending on symptoms and diagnostic tests, location and size of the fibroids, your general health and desire for future pregnancies.
  • For minimal symptoms, no treatment may be needed any you will be re-examined in 6 to 12 months.
  • Hormonal therapy is often considered as the first step in treatment.
  • Surgery may be recommended for certain situations and several different surgical procedures are possible. If surgery is recommended, be sure you understand all aspects of it before making a decision.
  • Keep a record of dates of bleeding and number of pads and used each day.
  • Blood transfusions may be necessary to correct anemia.