There may be several reasons for the pain in the abdomen after sex: 1. It may be that the woman suffers from vaginitis, pelvic inflammatory disease, endometritis, cervicitis and other gynecological inflammation, because the abdomen is clinically referred to as the pelvic cavity, the uterus, the fallopian tubes and so on are located in the woman’s pelvic cavity inside, that is, the equivalent of the small abdominal area. When there is inflammation of the uterus or fallopian tube, it can cause pain in the abdomen after sex. This is because sex can produce a certain stimulating effect on the uterus and fallopian tubes, and there will be a temporary rise in hormones during sex, these hormones will also stimulate inflammation, and the symptoms of inflammation will be temporarily aggravated thus leading to female abdominal pain; 2, may be due to other inflammatory diseases of the female abdomen, for example, a woman may be suffering from acute appendicitis or colorectal, proctitis, etc., because the location of all these organs are near the The location of these organs are close to the abdomen, located in the abdomen, sex may indirectly stimulate these organs, so that the inflammation of these organs aggravated caused by abdominal pain.