When vaginal bleeding occurs during non-menstrual periods, the following possibilities are mainly considered: first, ovulatory bleeding. Ovulatory bleeding, which mainly occurs in the middle of 2 periods, usually lasts 3-4 days clean, bleeds very little and is not accompanied by special discomfort. Second, contact bleeding. Contact bleeding refers to vaginal bleeding after intercourse or gynecological examination, mainly caused by cervical inflammatory diseases or lesions such as cervical polyps, endometrial polyps, or cervical cancer. Thirdly, it is mainly caused by gynecological inflammatory diseases. The bleeding caused by gynecological inflammatory diseases is mainly due to the exudation of inflammatory factors, and the patient will be accompanied by local redness, swelling and pain. Fourth, the bleeding caused by organic lesions. This includes endometrial polyps, cervical polyps, cervical cancer, endometrial cancer, ovarian cancer, etc. Fifth, it is mainly considered to be caused by trophoblastic disease or choriocarcinoma.