The causes of bleeding stool and stomach pain include bacillary dysentery, ulcerative colitis, intussusception and so on. 1. Bacterial dysentery: Bacterial dysentery is an intestinal infectious disease caused by Shigella spp. It can present with high fever, abdominal pain, diarrhea, and discharge of pus and blood and other symptoms. 2. Ulcerative colitis: ulcerative colitis is a chronic non-specific intestinal inflammatory disease, lesions are often located in the rectum and the sigmoid colon, often appearing in the left lower abdominal pain and mucus, pus and blood stool. 3. Intussusception: Intussusception is a section of the intestines into the lumen of a section of the intestines connected to it, which may appear as abdominal mass, abdominal pain, jam-like stools and so on. There are many other reasons for bleeding stools and stomach pain. If you have the above symptoms, you should go to the hospital in time to get a clear explanation of the cause and then give targeted treatment.