Vaginal bleeding after sexual intercourse is often related to the following factors: First, vulvar malnutrition, due to long-term vulvar malnutrition resulting in localized atrophy of the vulva, skin cracks will occur after sexual intercourse, resulting in vaginal bleeding. Secondly, due to vulvar inflammation, the skin and mucous membrane become brittle, after coitus, the local skin breaks under the action of external force, resulting in bleeding. Third, due to the inflammation of the vagina itself, friction after intercourse, so that the vaginal mucosa local capillary rupture bleeding phenomenon. Fourth, due to the inflammation of the cervix itself, cervical polyps will cause bleeding after contact. Fifth, due to the local precancerous lesions of the cervix or the early stage of cervical cancer, bleeding after coitus can also occur. Therefore, bleeding after coitus should be taken seriously clinically, and it is recommended to do gynecological examination, as well as routine test of leukorrhea and screening for cervical cancer.