After coitus, if there is vaginal bleeding, then we first need to rule out whether it is before or after menstruation coitus, because at this time there may be some blood in the uterine cavity has not been drained, after coitus there may be a small amount of blood in the vagina, this situation can be ignored first. The second situation is to exclude whether there is a cervical lesion, one is cervicitis, if cervicitis after coitus, there may be vaginal bleeding. The second is cervical polyps, cervical polyps are relatively soft, after coitus stimulation, may also appear vaginal bleeding. Another is whether there is cervical cancer or pre-cancerous lesions of the cervix, because the earliest clinical manifestation of cervical cancer is vaginal bleeding after coitus, if there is vaginal bleeding after frequent coitus, it is best to go to the hospital to do a checkup, first of all, exclude cervical superfluous organisms, do cervical cancer screening, to exclude pre-cancerous lesions of the cervix or cervical cancer.