Abdominal pain after abortion, but no vaginal bleeding, may be caused by the following reasons: 1. Consider whether it is caused by uterine perforation, when the uterus is perforated internal bleeding is relatively more, often there is no vaginal bleeding, pain is often more serious, ultrasound examination will find that the plasma membrane layer of the uterus is not continuous, if necessary, need to open the abdomen to give repair. 2. It may be caused by infection, resulting in pelvic inflammatory disease, endometrial inflammation and other pain in the lower abdomen, often without vaginal bleeding, but with increased vaginal discharge.