A small amount of bleeding after intercourse can be caused by a number of things, for example, if intercourse is hard, it may irritate the cervix or vaginal wall and cause bleeding to occur. The bleeding usually lasts for 3-7 days and can heal on its own without treatment. Bleeding after intercourse can also be caused by cervical erosion. Because the columnar epithelium of the cervix is ectopic, it can cause localized erosive hyperplasia, which may cause bleeding if the erosive surface is stimulated during coitus. In this case, it is recommended to go to the hospital for observation, to rule out the occurrence of cervical erosion, and then according to the situation of the treatment, can help to stop bleeding and prevent infection.