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Causes of endometriosis

Doctors don’t really know why

endometriosis occurs. It may result from fragments of the tissue lining the womb (endometrium) ‘escaping’ down the fallopian tube and into the abdomen during a menstrual period. These fragments then ‘seed’ onto the tissues in the abdomen and patches of endometriosis form. These patches behave as though they were in the womb, producing a ‘period’ each month. The endometriosis tissue needs the female hormone oestrogen to survive, so endometriosis is not found in girls before puberty or in women after the menopause when oestrogen levels are very low.