Bleeding after each coitus is usually considered to be caused by cervical cancer, cervicitis, endometrial polyps, endometritis, vaginitis and other diseases. 1. Cervical diseases: including physiological erosion-like changes of the cervix, cervicitis, cervical polyps, cervical cancer and so on, all of which may cause bleeding after coitus, through gynecological examination, and further cervical TCT and HPV examination to clarify the cause of the disease. 2. Endometrial diseases: including endometrial polyps or endometritis, the stimulation of the uterus will cause bleeding, some will be accompanied by abdominal pain, irregular bleeding and other abnormalities, you can do ultrasound or hysteroscopy to clarify the diagnosis. 3. Vaginal diseases: for example, trichomonas vaginitis, senile vaginitis, etc., some of them may cause bleeding after the damage of vaginal mucous membrane breaks down, usually accompanied by pain in coitus, abnormal leukorrhea, and so on. You can do gynecological examination to observe the lesion area and test the secretion to make a clear diagnosis. In addition, during the ovulation period, because of hormonal fluctuations, it is easy to cause a small amount of endometrial stripping and bleeding after intercourse; three days before menstruation or three days after menstruation is just clean, intercourse is also easy to cause vaginal bleeding; it is necessary to combine with the situation of one’s menstrual cycle to identify. Every time you bleed after intercourse, it is recommended to go to the hospital for cervical screening and ultrasound to clarify the cause of the disease, and standardize the treatment under the guidance of the doctor to avoid delaying the condition.