If after a natural miscarriage, there is prolonged vaginal bleeding and accompanying abdominal pain, it is necessary to consider the possibility that the miscarriage was incomplete. In this case, the first step is to go to the hospital for an ultrasound to check if there is any residual tissue in the uterine cavity and the size of any remaining embryonic tissue. Treatment should be determined based on the size of the residual tissue. If the residual tissue is relatively small, about 1 centimeter, it is generally possible to promote uterine contraction and aid the expulsion of the residual tissue by taking medications that improve blood circulation and remove blood stasis. If the residual tissue is larger, exceeding 2 centimeters, taking medication generally does not yield good results, and it becomes necessary to proceed with further surgical cleaning of the uterus.