Blood in stool is a common clinical symptom. Intermittent blood in stool is often not taken seriously by patients; in fact, blood in stool can involve multiple systems or diseases of multiple natures and should be taken seriously enough. After bleeding from the digestive tract is expelled through the intestines, the stool is bloody or full blood stool, which can be bright red, dark red and tarry in color. The color of the bloody stool depends on the location of the bleeding, the amount of bleeding and the time the blood stays in the GI tract. Bleeding from the lower GI tract (small intestine, colon, rectum, anus) often results in bright red or dark red stools. In the upper GI tract (esophagus, stomach, duodenum), the stool is often tarry. Blood in stool is generally divided into fresh blood stool, tarry stool and occult blood stool. Common diseases include hemorrhoids, anal fissures, polyps, gastrointestinal tumors, ulcers, etc. Blood in the stool: 1, fresh blood stool: generally from the lower ileum, colon, rectum, anus, stool color bright red or dark red, can be mixed with mucus and pus blood. Common diseases are: hemorrhoids, anal fissure bleeding. Hemorrhoids bleeding in stool with jet-like outflow or dripping blood after stool; anal fissure with less blood in stool but more intense anal pain. Rectal polyp bleeding, blood in stool is not large, blood is attached to the surface of the stool, sometimes the stool becomes thin and streaky or there are pressure marks. In dysentery, blood in the stool is in the form of pus and blood, and the number of stools is high, accompanied by pain in the left lower abdomen. It is worth mentioning that more than 85% of rectal tumors can be detected by simple anorectal examination. 2, tarry stool: that is, black stool. The upper gastrointestinal bleeding is not vomited, the blood stays in the intestine for a long time, and the hemoglobin in the blood combines with the sulfide in the intestine to form ferrous sulfide, which makes the stool black and shiny, like tar. The presence of tarry stools indicates that the amount of bleeding has reached 60 ml or more. But pay attention to certain foods, drugs can make the stool black, with stool occult blood test can be identified. 3, occult blood stool: Where a small amount of gastrointestinal bleeding does not cause a change in the color of the stool, only in the laboratory stool occult blood test positive, called occult blood stool. All diseases that cause gastrointestinal bleeding can occur occult blood stool, common gastric ulcer, gastric cancer. Endoscopy, barium enema and other tests can help clarify the diagnosis. The treatment is basically the same as for vomiting blood. Quiet bed, reduce activity, observe the amount of bleeding, use appropriate hemostatic drugs, and send to hospital for emergency treatment in time for syncope and shock. Our recommendations for bleeding symptoms in anorectology are: first, clear diagnosis; second, timely treatment to avoid future problems.