by Debra Wood, RN
Normally, endometrial tissue is found only inside the uterus. The uterus is the reproductive organ where a fetus develops. Hormones cause the tissue to form there, preparing the body for a fertilized egg. If you do not become pregnant, the tissue leaves the body during menstruation.
In endometriosis, endometrial-like tissue is found outside the uterus. For example, it may be found on organs in the abdomen or pelvis. In these places, the tissue still responds to hormones. It swells, breaks down, and bleeds. But it is unable to leave when you menstruate. Surrounding tissue becomes inflamed. There is often scarring.
Possible causes include:
Hormones and growth factors cause the disease to progress.
Risk Factors TOP
Factors that may increase your risk of endometriosis include:
Symptoms range from mild to severe. You may have many large growths with little pain. Or, you may have small areas with intense pain.
You will be asked about your symptoms and medical history. A pelvic exam will be done. These are best done early in the menstrual period. Since you may not have any symptoms, diagnosis is usually confirmed with a laparoscopy. This test allows the doctor to see if there are patches of endometrial tissue and scar tissue.
The goals of treatment are to:
Treatment options depend on:
Your doctor may recommend:
Hormones are an option for women who are not trying to become pregnant. Birth control pills and other injectable drugs interfere with estrogen production. These medications may decrease pain and shrink the size and number of endometrial growths. But, symptoms and endometrial growths tend to come back when the hormones are stopped. If birth control pills are prescribed to manage endometriosis, then they are often used continuously, so that you do not menstruate. After surgery, birth control pills may reduce the chance of these growths returning.
There is no known way to prevent this condition.
The American College of Obstetricians and Gynecologists
The Society of Obstetricians and Gynaecologists of Canada
Women's Health Matters
American Academy of Family Physicians. Endometriosis: what you should know. Am Fam Physician. 2006 Aug 15;74(4):601-2. Available at:
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Accessed October 8, 2015.
The American College of Obstetricians and Gynecologists. The Management of Endometriosis. Practice bulletin No. 114; July 2010.
Endometriosis. The National Institute of Child Health and Human Development website. Available at:
...(Click grey area to select URL)
Updated June 24, 2013. Accessed October 8, 2015.
3/12/2010 DynaMed Plus Systematic Literature Surveillance http://www.dynamed.com/topics/dmp~AN~T115220/Endometriosis: Seracchioli R, Mabrouk M, Frascà C, et al. Long-term cyclic and continuous oral contraceptive therapy and endometrioma recurrence: a randomized controlled trial. Fertil Steril. 2010;93(1):52-56.
Last reviewed September 2015 by Andrea Chisholm, MD
Last Updated: 9/23/2014
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