Intestinal bleeding is usually caused by intestinal inflammation, ulcer, trauma, tumor, etc. Whether the condition is serious needs to be judged by doctors according to the cause and degree of bleeding, etc. 1. Inflammation: When the intestinal tract is infected with inflammation, the lesion may cause mucosal detachment and necrosis, resulting in intestinal bleeding, such as acute hemorrhagic enteritis, pseudomembranous enteritis, Crohn’s disease, amoebic enteropathy, intestinal tuberculosis, etc.; 2. Ulcer: Ulcer may invade the basal vessels, leading to ruptured blood vessels and bleeding, such as duodenal ulcers, small intestinal ulcers, colonic ulcers, etc.; 3, polyps or tumors: intestinal bleeding caused by polyps or tumors may be relatively small, but should not be ignored, such as colorectal cancer, colorectal polyps, small intestinal polyps, etc.; 4, vascular lesions: when there are vascular lesions in the intestine, it may cause massive intestinal bleeding, such as ruptured varicose veins, bleeding, intestinal hemangiomas , vascular malformation, etc.; 5, other: intestinal entrapment, hemorrhoids and systemic diseases, such as allergic purpura, leukemia, etc. may also cause intestinal bleeding. If a small amount of bleeding is caused by inflammation, ulcers, polyps, etc., it is usually not too serious, and patients usually do not need to worry too much, and the bleeding symptoms can be relieved after taking gastrointestinal tract protection and anti-inflammatory drugs as prescribed by the doctor. If the bleeding is caused by tumors, vascular lesions, etc., it is generally more serious and requires immediate medical attention for early and rapid differential diagnosis and, if necessary, rectal finger examination, imaging and colonoscopy to clarify the cause and then take appropriate measures for symptomatic treatment.