There are several cases of pain in the small stomach and anus: 1. The pain of cramping phenomenon occurs, usually because of the presence of intestinal cramps, often accompanied by intestinal tinnitus and diarrhea, which is commonly caused by unclean diet, resulting in intestinal contents that are not tolerated, and then also cramp-like pain. In addition, it is also necessary to check whether there are stones in the urinary system or urinary system infections. 2. If there are stones in the urinary system, which can also cause cramp-like pain in the small abdomen, you can consider doing an ultrasound of the urinary system to clarify, you can also consider doing anoscopy to rule out the possibility of submucosal abscesses in the rectum or anal abscesses. 3. If it is a perianal abscess or perianal abscess, it is a purulent perianal infection and requires better treatment through surgery. To sum up, if the condition is serious, go to the hospital in time to get the right medicine.