Vaginal bleeding during sexual intercourse may be caused by a small amount of endometrial exfoliation in the uterine cavity when a woman has just had her period or after her period has just cleared. Second, if a woman has cervical inflammation or cervical malignant disease, it may also lead to cervical bleeding and vaginal bleeding. Third, when women suffer from dysfunctional bleeding or endometrial polyps affecting the contraction of the uterus, strong contraction of the uterus during sexual intercourse will also lead to endometrial exfoliation and vaginal bleeding, when vaginal bleeding occurs after sexual intercourse is abnormal, malignant changes of the cervix should be excluded in time. If the lesion comes from inside the uterine cavity, hysteroscopic examination should be given in time, and treatment according to different causes is effective.