If a woman has a case of incomplete discharge more than two months after delivery, she should go to the hospital for a gynecological ultrasound and blood tests such as chorionic gonadotropin and routine blood tests. If there are endometrial polyps or submucosal fibroids in the uterine cavity that affect the contraction of the uterus, the uterus should be cleared and, if necessary, the foreign body in the uterine cavity should be removed under hysteroscopy and sent for pathology to clarify the nature of the lesion. If the postpartum uterus is normal or slightly larger and the chorionic gonadotropin level is elevated, pregnancy may be ruled out as well as trophoblastic disease. It is necessary to give timely hospitalization and treatment with methotrexate, a drug that kills trophoblast cells, to prevent choriocarcinoma from occurring.