The pain in the lower abdomen after intercourse may be caused by sexual stimulation, pelvic inflammation, endometriosis and other reasons. 1. Sexual stimulation: sex may be too rough, resulting in excessive pelvic congestion or local mucosal damage, resulting in lower abdominal distension after intercourse. 2. Pelvic inflammatory disease: If there is pelvic inflammatory disease, it may lead to the presence of inflammatory exudation in the pelvic cavity, so that the tissue adhesion, resulting in abdominal distension after sex. 3. Endometriosis: If endometriosis exists, it may lead to abnormal adhesions and inflammation in the pelvis, resulting in persistent pain. The pain in both lower abdomen after intercourse may be accompanied by other reasons, it is recommended to go to the hospital in time when this situation occurs, and take reasonable methods to deal with it under the guidance of the doctor.