There is a lot of blood in the stool, considering ulcerative colitis, digestive tract tumors, colon polyps, hemorrhoids, esophagogastric fundus varices and other diseases. 1. Ulcerative colitis: generally due to ulcerative colitis, resulting in ulceration of the colon, causing blood vessel rupture in the mucosa, causing bleeding in the stool, ulcerative colitis may also occur abdominal pain, diarrhea and other symptoms. 2. Tumor of digestive tract: the surface mucosa of digestive tract tumors is prone to erosion, which may lead to massive bleeding and other symptoms. 3. Colorectal polyps: it may be due to the fact that when defecating, the stool stimulates the intestinal mucosa, causing bleeding phenomenon, colorectal polyp bleeding is usually accompanied by constipation and other symptoms. 4. hemorrhoids: usually due to dry stool stimulation, damage to the hemorrhoidal nucleus, causing bleeding phenomenon, mostly internal hemorrhoidal bleeding, can occur jet bleeding. 5. Esophagogastric fundus varices: it may be due to esophagogastric fundus varices, resulting in esophageal mucosa damage, causing bleeding phenomenon. If there is a lot of blood in the stool, it may also be due to upper gastrointestinal ulcer, intestinal parasitosis, coagulation dysfunction and other factors. Therefore, if there is a lot of blood in the stool, you should consult a doctor in time, complete the examination, make a clear diagnosis and determine the treatment plan under the guidance of the doctor.