Conditions InDepth: Endometriosis
by Editorial Staff and Contributors
Endometrial tissue is the inner lining of the uterus. Endometriosis is when this tissue grows outside of the uterus. The most common sites outside of the uterus include:
Endometrial tissue is part of the menstrual cycle. It swells, breaks down, and bleeds. This process is caused by hormones. The tissue outside the uterus will also react to hormones in the same way. It will cause swelling and pain in areas outside of the uterus. It can also cause problems in women who are trying to get pregnant.
Endometriosis may occur at any age. It is most common between the ages of 25 and 40. The exact cause is unknown. Some possible factors include:
American College of Obstetricians and Gynecologists (ACOG). Practice bulletin no. 114: management of endometriosis. Obstet Gynecol. 2010 Jul;116(1):223-36, reaffirmed 2018
Endometriosis. ACOG website. Available at: https://www.acog.org/Patients/FAQs/Endometriosis. Updated January 2019. Accessed November 2, 2019.
Endometriosis. EBSCO DynaMed Plus website. Available at: https://www.dynamed.com/condition/endometriosis . Updated August 30, 2019. Accessed November 2, 2019.
Endometriosis. US HHS Office on Women's Health website. Available at: https://www.womenshealth.gov/a-z-topics/endometriosis. Updated April 1, 2019. Accessed November 2, 2019.
Last reviewed September 2019 by EBSCO Medical Review Board Elliot Levine, MD
Last Updated: 11/6/2019
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