There will be contact bleeding during coitus, caused by a number of reasons: First, excessive force during coitus, stimulation of the cervix, including the vaginal wall of the blood vessels, will cause rupture, but more likely to cause bleeding. Second, cervical erosion, cervical hypertrophy, cervical naevus cyst accompanied by cervical congestion, due to inflammatory stimulation can also cause contact bleeding. Third, when there is a chance of precancerous lesions, it can also cause human papillomavirus infection, which can also cause contact bleeding. Fourth, when there are cervical polyps, vaginal inflammation, but more likely to cause contact bleeding. So the existence of bleeding must cause high attention, to go to the hospital for cervical examination, to rule out the occurrence of any disease, if necessary, to carry out symptomatic treatment, so as not to have a negative impact on the body.