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. Sometimes, they may stick out and affect nearby organs. It is common for there to be more than one fibroid.
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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.
Last reviewedDecember 2014by Andrea Chisholm, MD
Please be aware that this information is provided to supplement the care provided by your physician. It is neither intended nor implied to be a substitute for professional medical advice. CALL YOUR HEALTHCARE PROVIDER IMMEDIATELY IF YOU THINK YOU MAY HAVE A MEDICAL EMERGENCY. Always seek the advice of your physician or other qualified health provider prior to starting any new treatment or with any questions you may have regarding a medical condition.