After intercourse, causing pain in the lower abdomen may have the following causes: First, the action is relatively rough, causing pain in the lower abdomen caused by uterine contractions. Often it will be relieved after rest. Second, there is chronic inflammation of the pelvis. Third, there is endometriosis. Fourth, there are pelvic tumors that may cause pain in the stomach after intercourse. It is advisable to go to the hospital afterwards for the appropriate examination, and if there is pelvic inflammatory disease, actively anti-inflammatory treatment. If there is endometriosis, it can be treated clinically with a Manned IUD. If there is pelvic tumor, it is recommended to give surgical treatment as soon as possible in the clinic so that the pain in the small stomach after intercourse can be completely relieved. In addition, it is recommended that women have a gynecological examination every year to rule out tumors and the possibility of inflammation.