There is no such thing as the five major sequelae of cesarean section. The sequelae of cesarean section include endometriosis, pelvic adhesions and scarred uterus. 1. Endometriosis: during cesarean section surgery, due to the need to cut open the uterus and flush the abdominal cavity, it is easy to form endometriosis foci in the abdominal wall incision, which is manifested as cyclic pains with menstrual cycle, and needs to be surgically removed if necessary. 2. Pelvic adhesion: due to the surgical operation can cause inflammatory exudation of pelvic tissues, may be adhesion with the surrounding tissues, including the peritoneum with the uterus, the greater omentum, intestinal tract, etc., can cause pelvic inflammation, pelvic adhesion and other complications, may be repeated symptoms of lower abdominal pain, or may manifest asymptomatic. 3. Scarred uterus: uterine scar will also be formed after the uterine incision is well recovered after cesarean section, which increases the risk of uterine scar diverticulum, keloid pregnancy, placenta implantation, placenta praevia and so on.