If there is bleeding in coitus after menstruation, it may cause the following hazards clinically: firstly, bleeding in coitus, it may be because menstrual blood still remains in the uterine cavity. Through the coitus stimulation, caused by the uterus contraction, it will be manifested as a small amount of vaginal bleeding. The reason why there is still a small amount of menstrual blood in the uterine cavity is that the uterine lining has not been completely repaired. In this case, coitus may cause infection. Secondly, bleeding during intercourse after menstruation may be clinically caused by localized inflammation of the cervix, or localized lesions of the cervix. It is recommended to do cervical cancer screening to rule out the possibility of cervical lesions. HPV and TCT tests are needed to give a comprehensive analysis based on the results.