Definition

Fibroids are benign (noncancerous) growths in the wall of the uterus. The uterus is the organ where a fetus grows during pregnancy.

Fibroids are common. They may be very small or they could grow to eight or more inches in diameter. Most fibroids remain inside the uterus. In rare cases, they may stick out and affect nearby organs. It is common for there to be more than one fibroid.

Uterine Fibroid

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Causes

The cause of fibroids is unknown.

Fibroid growth is stimulated by female reproductive hormones. As a result:

• Fibroids grow larger during pregnancy then shrink after childbirth.
• Fibroids become less of a problem after menopause. However, symptoms may return with hormone replacement therapy (HRT)

Genetics may make some women more prone to fibroids. Substances that control blood vessel growth may also affect fibroid growth.

Risk Factors

Certain factors affect your risk of fibroids, for example:

• Risk increase with age until menopause
• African American women have increased risk of fibroids
• Family history

Obesity and high blood pressure may also be linked to fibroids.

Symptoms

Symptoms range from none at all to mild or severe. This depends on the size and location of the growths.

Symptoms may include:

• Pelvic pain
• Feeling of pelvic pressure
• Heavy menstrual bleeding
• Clots in menstrual flow
• Long periods
• Bleeding between periods
• Increased cramping during periods
• Pain during sex
• Frequent need to urinate
• Constipation
• Bloating
• Enlarged uterus (giving the appearance of pregnancy)
• Low back or leg pain
• Infertility by blocking the fallopian tubes
• Miscarriage

Iron-deficiency anemia may develop if bleeding is heavy. This is low levels of red blood cells. It will affect the amount of oxygen your blood can carry.

Diagnosis

Doctors find most fibroids during routine pelvic exams.

To confirm the diagnosis, your doctor may want to get a detailed picture of the fibroid. This may be taken with one or more of the following tests:

• Abdominal ultrasound
• Transvaginal ultrasound
• Computed tomography (CT) scan or magnetic resonance imaging (MRI)
• Hysteroscopy

Treatment

Most women with fibroids have no symptoms and do not need treatment. Your doctor may recommend "watchful waiting". During this period your doctor will monitor any changes on a regular basis. Treatment may be done later if needed.

Treatments include:

Other options include:

• Uterine fibroid ablation—This is a minimally invasive procedure. It blocks blood flow to the fibroids. This will make the fibroids shrink.
• Focused ultrasound therapy—Energy is centered on the fibroid to destroy it. This procedure may not be ideal for patients who are very overweight, have very large fibroids, or have extensive scars from prior abdominal surgeries.

If you are diagnosed with uterine fibroids, follow your doctor's instructions.

Prevention

There are no guidelines for preventing fibroids.