There are many reasons for bleeding during intercourse after menstruation, which can only be judged according to the time after menstruation, including intercourse within 24 hours and intercourse after more than 24 hours, as follows: 1. Intercourse within 24 hours: If there is vaginal bleeding during intercourse within 24 hours after menstruation, most of it is caused by residual blood in the uterine cavity or vagina, but this bleeding is brown or dark red. 2. Intercourse after more than 24 hours: If the bleeding occurs more than 24 hours after menstruation, it is not normal if the bleeding is bright red, it may be inflammation of the cervix, cervical polyps, precancerous lesions of the cervix, or cervical cancer, etc. It may also be submucosal fibroids. Therefore, it is important to go to the hospital as soon as possible for vaginal examination, pre-cancerous screening of the cervix, and ultrasound examination, etc.