When bleeding occurs after pregnancy, according to the patient’s other clinical symptoms, signs and relevant laboratory tests, it is divided into the following cases: First, the patient has normal development of embryonic tissues, bleeding and periodic bleeding, this condition is called “radical menstruation”. This is the name of the disease in Chinese medicine and refers to the first three months of pregnancy, after which the patient will have normal menstruation, but the amount of bleeding will be slightly less, but it will not affect the development of the embryo. Second, the possibility of pre-eclampsia or ectopic pregnancy or biochemical pregnancy should be considered. In this case, blood chorionic gonadotropin, progesterone and ultrasound should be checked for differential diagnosis. Thirdly, it is necessary to consider bleeding that is not related to pregnancy, such as bleeding caused by a combination of cervical or vaginal lesions during pregnancy. If the bleeding is caused by a combination of hematologic or other medical disorders after pregnancy.