I found that many patients are alarmed when there is bleeding in stool, suspecting that they have a very serious disease, and some patients do not take it seriously, mistaking it for hemorrhoids and ignoring it, but in fact it is a rectal tumor, and as a result, they miss the best time for treatment. So what diseases can cause bleeding in the stool? There are many causes of gastrointestinal bleeding, the more common are the following diseases: 1, upper gastrointestinal diseases: ① esophageal diseases: esophageal varices rupture, esophagitis, esophageal diverticula along, esophageal cancer, esophageal foreign body, esophageal cardia mucosa tear, esophageal hiatal hernia, etc. ②Gastric and duodenal diseases: gastric and duodenal ulcers, acute gastroduodenal mucosal lesions, gastric cancer, gastric mucosal prolapse, vascular abnormalities such as rupture of the constant diameter artery, etc. ③Hepatic and biliary tract diseases: portal hypertension of cirrhosis can cause rupture and bleeding of esophageal and fundic varices; rupture and bleeding of liver cancer, liver abscess or hepatic aneurysm, gallbladder and biliary tract stones, biliary tract parasites, gallbladder cancer, bile duct cancer and pot belly cancer can all cause bleeding. 4. Pancreatic diseases: acute pancreatitis combined with abscess or cyst, ruptured pancreatic cancer bleeding. 2, small intestinal diseases: intestinal tuberculosis, intestinal typhoid, acute hemorrhagic necrotizing enteritis, hookworm disease, clonorchisis, small intestinal tumor, small intestinal hemangioma, jejunal diverticulitis or ulcer, Meckel diverticulitis or ulcer, intestinal overlap, etc. 3, colon diseases: acute bacterial dysentery, amoebic dysentery, schistosomiasis, ulcerative colitis, colonic diverticulitis, colon cancer, colon polyps, ischemic enteritis, etc. 4, rectal and anal canal diseases: rectal and anal canal injury, non-specific proctitis, rectal polyps, rectal cancer, hemorrhoids, anal fissure, anal fistula, etc. 5, systemic diseases: leukemia, thrombocytopenic purpura, hemophilia, hereditary capillary dilatation, vitamin C and K deficiency, epidemic hemorrhagic fever, septicemia, leptospirosis, dengue fever, etc. Therefore, it is very difficult to generalize about your bleeding stool and let your doctor determine exactly what disease you have. But you can try to describe the details of your own blood in stool clearly, which is helpful for doctors to make diagnosis and differential diagnosis, such as: the color of blood, bright red or dark red; the amount of bleeding; whether there is mucus and pus stool; whether there is abdominal pain, fever and signs of general bleeding, etc. The darkening of the stool is also noteworthy, indicating the possibility of gastrointestinal bleeding, which needs to be determined by a fecal occult blood test.