There are many reasons for bleeding after intercourse after menstruation: first, there may be cervical erosion. If the cervical erosion surface is stimulated after intercourse, it may lead to bleeding, and this contact bleeding should be screened regularly for cervical cancer to prevent cervical lesions. The second kind, may be ovulatory bleeding, coitus between menstruation just in time for ovulation, some people have hormonal fluctuations during ovulation, which may lead to withdrawal bleeding. In the third, there is still a small, residual amount of blood in the vagina after menstruation and vaginal bleeding after intercourse. This may generally be caused by a prolonged menstrual period and should be checked for bleeding caused by luteal atrophy.