Blood in the stool but no pain in the stomach may be caused by internal hemorrhoids, peptic ulcer, intestinal malignant tumors and other causes. 1. internal hemorrhoids: hemorrhoids because the anal cushion appears pathologically hypertrophied, and internal hemorrhoids is due to the anal cushion, vascular plexus, arteriovenous anastomosis branch pathologically altered, dry and hard stools will appear in the blood but the stomach does not hurt the situation, and the blood bleeds more, the flow of blood is faster. 2. Peptic ulcer: peptic ulcer is mainly due to the acidic gastric juice on the mucous membrane of the digestive effect of the formation, often heartburn, vomiting symptoms, if the ulcer site bleeding can appear with blood in the stool but the stomach does not hurt. 3. Intestinal malignant tumors: Intestinal malignant tumors can lead to the erosion of the blood vessels under the mucosa of the rectum, resulting in blood in the stool but no pain in the stomach. Blood in the stool but no pain in the stomach may have other reasons, such as anal fissure, etc., it is recommended to go to the hospital for examination, to clarify the cause of the disease and timely symptomatic treatment.