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With endometriosis, some tissue outside the womb acts like the endometrium womb lining tissue.

Endometriosis can be painful, resulting in heavy periods, abdominal pain and difficultly becoming pregnant.

Endometriosis is a long-term condition affecting around two million women in the UK.

Mild forms of endometriosis are common and may not require treatment.

What happens with endometriosis

At the end of every menstrual cycle, when hormones cause the uterus to shed its endometrial lining, endometrial tissue growing outside the uterus will break apart and bleed. However, unlike menstrual fluid from the uterus, which is discharged from the body during menstruation, blood from the misplaced tissue has nowhere to go. Tissues surrounding the area of endometriosis may become inflamed or swollen. The inflammation may produce scar tissue around the area of endometriosis. These endometrial tissue sites may develop into what are called lesions, implants, nodules or growths.

What causes endometriosis?

The cause of endometriosis is unknown. Some experts believe that pieces of endometrium travel back through the fallopian tubes and pass out into the pelvic cavity (space inside the pelvis that holds the reproductive organs). Tiny pieces of tissue may lodge on surfaces of the reproductive organs. During menstruation, the tissue bleeds, just like the endometrium inside the uterus. Blood from these areas can cause irritation of the surrounding tissue which may become swollen and inflamed. Over time, scar tissue and cysts can form.

What are the symptoms of endometriosis?

Very often, endometriosis has no symptoms. When symptoms are present, they may include:

Who can get endometriosis?

Any woman who has menstrual periods can get endometriosis. Endometriosis commonly occurs between the ages of 25 and 40, but it can also occur in younger women. The condition is most common in women who have not had children.

Is endometriosis cancer?

Endometriosis is not cancer. Endometriosis also does not increase a woman's risk of uterine or other cancers.

How do I know if I have endometriosis?

If you have any symptoms of endometriosis or are having difficulty becoming pregnant, seek medical advice.

If endometriosis is suspected, you may need to have a procedure called laparoscopy. In this procedure, the doctor inserts a small camera-like device through an incision in the abdomen. He or she views the reproductive organs and pelvic cavity using the device. A sample of tissue may also be gathered for testing, called a biopsy. However, because the laparoscopy has some risks, often the diagnosis of endometriosis is presumed and a treatment plan is started without doing the laparoscopy.

Can endometriosis be cured?

There is no known cure for endometriosis. Usually, once effective management of the symptoms has been determined, the treatment will continue until menopause, unless you are trying to become pregnant. There are very effective treatments to reduce the size of tissue growth and to relieve painful symptoms.

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