Large amount of bleeding in the stool is common in the following cases: 1. malignant tumors of the gastrointestinal tract. The tumor itself is rich in blood supply, if the tumor breaks down or erodes the larger blood vessels causing vascular damage, it may lead to large bleeding in the stool. 2, hemorrhoids. If the hemorrhoids are serious, the damage to the large blood vessels will also cause a large amount of bleeding in the stool. 3, some blood system diseases in the cause of coagulation disorders, platelet reduction, may also lead to a large amount of bleeding in the stool. 4, some liver disease, such as advanced cirrhosis of the liver, liver, etc., resulting in esophageal varices at the base of the stomach, the blood vessels are more likely to rupture, will also cause a large amount of blood in the stool, and in serious cases may also cause nausea, vomiting In serious cases, it can also cause nausea, vomiting, vomiting blood and other symptoms.