Where can endometriosis occur?
Endometrial implants usually occur in your pelvic region, including your ovaries, fallopian tubes, the lining of your pelvic cavity, on the outside of your uterus and on its ligaments and on your lymph nodes. Many women with endometriosis have lesions in more than one location. Endometriosis may sometimes occur in other parts of your abdomen, such as your rectum and bladder. In rare cases, endometrial tissue may be discovered in other body parts such as your arms, legs or lungs.

What causes endometriosis or increases your risk?
The cause of endometriosis is unknown. It is not completely understood if the endometrial tissue moves to other locations or develops there as a result of cell changes. Women at higher risk for endometriosis include those who have never given birth, those who have had female surgical procedures and those with menstrual periods that last longer than eight days.

Can endometriosis be prevented?
No. There are no known methods to prevent endometriosis. The disease usually continues unless it is interrupted by pregnancy or treated. It can recur with all treatments. At menopause, the symptoms may lessen. The effect of hormone replacement therapy in women with endometriosis who reach natural menopause is unknown.

What are the symptoms of endometriosis?
The symptoms of endometriosis may include pain during menstruation or sexual intercourse, painful urination or bowel movements during menstruation, heavy menstrual bleeding or any premenstrual bleeding. Sometimes women experience chronic pain. Some women have no symptoms.