After intercourse, there will be pain and swelling in the abdomen, which can be caused by a number of factors: First, when intercourse is performed, excessive force stimulates the cervix, including the vaginal wall, which can cause contraction of the uterus and can cause pain and swelling in the abdomen. Second, when having intercourse, the uterus may also be excited in small amounts. When there is excitement, it will also cause the uterine wall to cause contraction, which will also cause pain in the abdomen. When there is a gynecological disease, the pelvic cavity itself will have a large amount of fluid, because of intercourse will cause local vasodilation, will accelerate the blood flow signal, and cause a small abdominal distension and pain. Fourth, when there is intercourse is in the luteal secretion period, then there will be luteal cysts, but also due to excessive force, stimulating the luteal function rupture, causing the abdominal distension and pain. So at this time must be observed. If it subsides in 2-3 days, it will not affect your health. But persistent occurrence must go to the hospital for ultrasound to rule out the chance of luteal rupture.