The cause of endometriosis isn’t known, but several theories suggest it could be genetic as it runs in families and impacts certain ethnic groups more than others.
Another cause could be retrograde menstruation, where some of the womb lining flows up through the fallopian tubes and embeds itself on the organs of the pelvis, rather than leaving the body as a period.
Some experts think endometriosis is due to a problem with the immune system.
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According to the NHS, it is likely the condition is caused by a combination of different factors.
