Article Translations: (Spanish)
Endometriosis (pronounced: en-doh-mee-tree-OH-sis) happens when tissue that looks and acts like the lining of the uterus grows outside the uterus. The lining of the uterus is called the endometrium.
Most often, this tissue grows on the:
Doctors don't know the exact cause of endometriosis.
Very painful menstrual cramps is the most common symptom of endometriosis. The growths outside the uterus swell and bleed with the menstrual cycle, just as the endometrium does. When the blood has nowhere to go, it can get trapped. This irritates the surrounding areas, causing pain. Over time, scars can form.
Other symptoms of endometriosis include:
Lots of people get period pain and the other symptoms listed above that aren't due to endometriosis. So diagnosing the condition can be hard. Doctors will ask questions and do an exam. They also might order an ultrasound. They might order a magnetic resonance imaging (MRI) scan.
If the doctor thinks someone has endometriosis, the first step is to treat it with pain relievers, like ibuprofen, and hormone therapy like some types of birth control. Hormone therapy decreases bleeding, and as a result, eases pain.
If symptoms are severe or don't improve over 3–6 months of medical treatment, the doctor may recommend laparoscopic surgery, also called laparoscopy (pronounced: la-puh-RAS-kuh-pee).
In laparoscopy, a surgeon inserts a thin tube with a camera through a tiny cut in the skin. The surgeon looks for the growths. They might also do a biopsy (take a small sample of to study).
Laparoscopy is also a way to treat endometriosis because the surgeon can remove growths in the abdomen and pelvis. Sometimes, the surgeon will place an intrauterine device (IUD) to deliver hormones. After surgery, most people have less pain.
Surgery is not a cure. But when combined with hormone therapy, like birth control pills, the birth control shot, or an IUD, it can help control pain and prevent endometriosis from getting worse.
To help relieve period pain, you can try:
Note: All information is for educational purposes only. For specific medical advice, diagnoses, and treatment, consult your doctor.
© 1995-2025 KidsHealth ® All rights reserved. Images provided by iStock, Getty Images, Corbis, Veer, Science Photo Library, Science Source Images, Shutterstock, and Clipart.com