Blood in the stool is also more common in gastroenterology clinics. If a patient has blood in the stool, it is actually a physical alarm, and he or she must go to the gastroenterology or anorectal department of a hospital to find a specialist to determine the site and cause of bleeding. The following diseases can lead to blood in the stool: 1) hemorrhoids, including internal and external hemorrhoids; 2) anal fissures, after the anal fissure, due to the rupture of blood vessels with blood; 3) gastrointestinal tumors, no matter what part of the gastrointestinal tract tumors, can appear gastrointestinal bleeding, as long as the destruction of blood vessels, such as gastric cancer, colon cancer, small intestine cancer. Some benign tumors can also appear blood in the stool, such as hemangioma, intestinal polyps; 4, for the elderly, some vascular diseases, such as hyperlipidemia, diabetes, hypertension, there is such a risk of intestinal vascular embolism, intestinal vascular embolism can appear after the necrosis of the intestinal wall, such patients can also appear intestinal bleeding; 5, resulting in coagulation, hemostasis patients can also appear blood in the stool. Therefore, the presence of blood in the stool indicates an alarm in the body and needs to be clarified by a specialist in a timely manner.