Endometriosis is a relatively common gynecological disease that causes a series of symptoms such as severe menstrual pain and infertility, which can have a great impact on a woman’s life and work. The cause of endometriosis has not been clearly understood, but it has been found to be related to certain causes, such as intercourse during menstruation, multiple abortions or induced abortions, immunity, and genetic factors. Having intercourse during menstruation may cause menstrual blood to flow backwards, and a small portion of menstrual blood mixed with shed endometrial fragments may flow from the fallopian tube into the abdominal cavity and be planted on the surface of the pelvic organs, creating a foci of endometriosis. Having a cesarean section, multiple abortions or induced abortions can artificially cause endometriosis by transplanting endometrium to certain areas. Changes in the growth of the endometrium and the secretion of female hormones by the ovaries have an important relationship, and women in their reproductive years are prone to endometriosis. Genetic factors are also a relatively important cause. If a mother has endometriosis, the chances of her daughter having endometriosis are also greatly increased. In conclusion, the causes of endometriosis in women are many, so you should pay more attention to your personal hygiene, stop having sex during your period, and especially don’t do abortions or induced abortions lightly.