Most of the stomach pain after intercourse during menstruation is due to pelvic inflammatory disease caused by infection leading to abdominal pain. In this case, it is recommended to go to the hospital as soon as possible to improve the relevant examinations, such as blood tests, to understand whether there is an infection, if there is an infection, need to be treated with antibiotics symptomatic treatment. When a woman is on her period, also known as menstruation, it is a time when her body’s resistance is very low. Doctors advise against coitus during menstruation, as coitus may cause infections, and heavy infections can cause pelvic inflammatory disease, salpingitis, and tubal obstruction, which is very bad for a woman’s health in the future. Therefore, doctors recommend women to pay attention to personal hygiene during menstruation, prevent infection, rest more and strengthen nutrition.