Bleeding during intercourse three days after menstruation is not related to menstruation itself, but to the following factors: First, local lesions of the cervix, such as inflammation, polyps or cancer, may lead to bleeding during intercourse. Secondly, inflammation of the vaginal mucosa, which causes bleeding after intercourse due to friction caused by mucosal rupture. Thirdly, submucosal fibroids can also cause bleeding during intercourse. Patients are advised to go to the hospital for examination as soon as possible and pay enough attention to the possibility of cervical cancer, so that cervical cancer screening can be done and the corresponding treatment can be given according to the results. If there are other causes of intercourse bleeding, it should be treated actively.