The causes of posterior uterus clinically may be caused by the following reasons: 1, some of the posterior uterus is determined by congenital reasons, there are some lesbians is congenital posterior tilt of the uterus, does not affect the normal sexual life does not affect menstruation, at the same time can be normal pregnancy, this situation and does not require special treatment. 2, after caesarean section may cause posterior uterus, due to caesarean section caused by pelvic adhesions, ligament changes If there are no other abnormalities, no treatment is clinically necessary. 3. In pelvic endometriosis, there is often a posterior uterus, which may cause lumbosacral pain, pressure pain, and tenderness during intercourse. This condition is caused by pelvic endometriosis and should be treated clinically according to the cause.