Abdominal pain after intense sex may be due to external injury, semen allergy, inflammatory lesions and so on. 1. External injury. If the man’s movements are too intense when having sex, it may cause the pressure in the woman’s abdominal cavity to rise, and cause the uterus and rectum as well as the bladder to be severely squeezed. The symptoms of paroxysmal abdominal pain may occur after the end of sexual intercourse. 2. Semen allergy. If a man or woman does not take protective measures, such as wearing a condom, during sex, semen will flow into the woman’s body. If a woman is allergic to semen, it will cause an allergic reaction, resulting in abdominal pain and other uncomfortable symptoms after sex. 3. Inflammatory lesions. If a woman has cervicitis, adnexitis, pelvic inflammatory disease, etc., before having sex. Inflammatory conditions may be aggravated by strenuous exercise during sex, causing abdominal pain after sex. If abdominal pain occurs after strenuous sexual intercourse, it is recommended to consult a doctor in time to clarify the cause of the disease and then treat it under the guidance of the doctor.