A small amount of bleeding from the lower body after coitus is usually caused by gynecological inflammation, occupational disease, functional uterine bleeding and other reasons. 1. Gynecological inflammation: for example, cervicitis, vaginitis, etc., there will be a small amount of bleeding after intercourse. 2. Occupational diseases: for example, cervical cysts, cervical polyps, cervical cancer, etc. Stimulation of the affected area during intercourse can cause a small amount of bleeding in the lower body. 3. Functional uterine bleeding: generally caused by hormone level disorders in the body, this situation can also appear with a small amount of coital bleeding. There may also be other reasons for the small amount of bleeding during intercourse, so it is recommended that the patient actively consult a doctor, improve the examination to clarify the cause of the disease, and then give targeted treatment or standardized treatment.