The Truth about Fibroids

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Fibroids are muscular tumors that grow in the wall of the uterus (womb). Another medical term for fibroids is leiomyoma or just "myoma". Fibroids are almost always benign (not cancerous). Fibroids can grow as a single tumor, or there can be many of them in the uterus. They can be as small as an apple seed or as big as a grapefruit. In unusual cases they can become very large. 

About 20 percent to 80 percent of women develop fibroids by the time they reach age 50. Fibroids are most common in women in their 40s and early 50s. Not all women with fibroids have symptoms. Women who do have symptoms often find fibroids hard to live with. Some have pain and heavy menstrual bleeding. Fibroids also can put pressure on the bladder, causing frequent urination, or the rectum, causing rectal pressure. Should the fibroids get very large, they can cause the abdomen (stomach area) to enlarge, making a woman look pregnant.  

No one knows for sure what causes fibroids. Researchers think that more than one factor could play a role. These factors could be:

• Hormonal (affected by estrogen and progesterone levels)
• Genetic (runs in families)

Fibroids are almost always benign (not cancerous). Rarely (less than one in 1,000) a cancerous fibroid will occur. This is called leiomyosarcoma. Doctors think that these cancers do not arise from an already-existing fibroid. Having fibroids does not increase the risk of developing a cancerous fibroid. Having fibroids also does not increase a woman's chances of getting other forms of cancer in the uterus. 

Your doctor may find that you have fibroids when you see her or him for a regular pelvic exam to check your uterus, ovaries, and vagina. The doctor can feel the fibroid with her or his fingers during an ordinary pelvic exam, as a (usually painless) lump or mass on the uterus. Often, a doctor will describe how small or how large the fibroids are by comparing their size to the size your uterus would be if you were pregnant. For example, you may be told that your fibroids have made your uterus the size it would be if you were 16 weeks pregnant. Or the fibroid might be compared to fruits, nuts, or a ball, such as a grape or an orange, an acorn or a walnut, or a golf ball or a volleyball.

Your doctor can do imaging tests to confirm that you have fibroids. These are tests that create a "picture" of the inside of your body without surgery. These tests might include:

• Ultrasound – Uses sound waves to produce the picture. The ultrasound probe can be placed on the abdomen or it can be placed inside the vagina to make the picture.
• Magnetic resonance imaging (MRI) – Uses magnets and radio waves to produce the picture
• X-rays – Uses a form of radiation to see into the body and produce the picture
• Cat scan (CT) – Takes many X-ray pictures of the body from different angles for a more complete image
• Hysterosalpingogram (HSG) or sonohysterogram – An HSG involves injecting x-ray dye into the uterus and taking x-ray pictures. A sonohysterogram involves injecting water into the uterus and making ultrasound pictures.