There are the following clinical reasons for the pain in the small abdomen after intercourse: first, the relatively rough movements during sex can cause uncoordinated contractions of the uterus, so there will be pain in the small abdomen after intercourse, and the pain will often be relieved after ten minutes of rest. The second, because there was a chronic pelvic inflammatory disease, stimulation during intercourse can lead to increased congestion in the pelvic cavity, so there will also be small abdominal distension and pain. Thirdly, in the case of clinical pelvic tumors, stimulation after intercourse will also lead to lower abdominal distension and pain. Therefore, it is recommended that in this case: 1) to do a gynecological examination; 2) to do an ultrasound examination of the pelvic cavity, through these two examinations, you can basically make a preliminary clinical diagnosis of what causes the pain in the small abdomen after intercourse and give the necessary intervention according to the results.