Brown discharge with abdominal pain after intercourse after menstruation may be caused by cervicitis, endometritis, salpingitis and so on. 1. Cervicitis: If the cervical mucous membrane is damaged during intercourse, the invasion of pathogenic bacteria may lead to the appearance of brown discharge with abdominal pain after intercourse after menstruation. 2. endometritis: if a woman has a history of unclean sex, pathogenic bacteria can go upward into the endometrium, causing endometritis, resulting in a woman’s postmenstrual coitus, brown discharge, accompanied by abdominal pain. 3. Tubalitis: With the development of the disease, pathogenic bacteria invade the fallopian tubes, women will also appear after menstruation, brown discharge, accompanied by abdominal pain. If a woman has brown discharge and abdominal pain after menstruation, it is recommended to go to the hospital in time to improve the examination to clarify the cause of the disease, and then give targeted treatment or standardized treatment.