The common causes of small abdominal pain and bleeding stools are mainly rectal submucosal abscess, mixed hemorrhoids, and rectal malignant tumors. A. Rectal submucosal abscess, patients due to bacterial infection and other reasons, the formation of abscesses in the rectal submucosa may appear small abdominal swelling, pain, and along with the abscess broke also appear blood in the stool symptoms. The most common type of mixed hemorrhoid is varicose internal and external hemorrhoids, which often cause pain in the abdomen when the nucleus of the internal hemorrhoid prolapses and pulls on the rectal wall, and cause the mucous membrane of the internal hemorrhoid surface and the skin of the external hemorrhoid to break under the long-term stimulation of the stool. The main malignant tumor of the rectum is rectal cancer, which can cause bleeding in the submucosal vessels of the rectum during the development of the disease, causing blood in the stool, and is often accompanied by the symptoms of urgency, diarrhea and constipation alternately.