The main causes of frequent stomach pain and diarrhea are as follows: 1. Inflammation of the intestine and non-specific enteritis, including ulcerative colitis, Crohn’s disease, etc., which is mainly due to inflammation leading to excessive intestinal peristalsis, resulting in pain and incomplete absorption of food, causing symptoms of diarrhea. 2. Irritable bowel syndrome, mainly due to intestinal nerve dysfunction, resulting in excessive intestinal peristalsis, resulting in paroxysmal colic and thinning of stool and diarrhea. 3. 3, polyps and tumors of the intestine can also produce changes in stool characteristics, such as an increase in the number of stools or thin, thin, unshaped stools, and blood in the stool, etc. The differential diagnosis can be made by abdominal CT and colonoscopy.