There are many reasons for abdominal pain after sex, which may be related to rough sex, pelvic inflammatory disease, intestinal cramps and so on. 1. Sexual behavior is too rough: rough sexual behavior may stimulate the female pelvis or uterus, and then appear after sex abdominal pain, usually after sexual behavior stops the pain will slowly disappear. 2. Pelvic inflammatory disease: Pelvic inflammatory disease is a group of diseases caused by infections in the upper reproductive tract of women, due to inflammation stimulation may lead to edema, congestion, pain and other symptoms in the abdomen after sex. 3. Intestinal spasm: it is a paroxysmal abdominal pain caused by strong contraction of the smooth muscle of the intestinal wall. Upper respiratory tract infections, localized cold, overeating, indigestion, etc. are common triggers. If intestinal spasm occurs while having sex, the phenomenon of sore abdomen after sex can occur. In addition, abdominal pain after sex can also be seen in other diseases, it is recommended to go to the regular hospital to clarify the cause of the disease, under the guidance of the doctor to carry out the next examination and treatment.