Blood in the stool for two consecutive days, it has many causes. If the blood in the stool is bright red, it indicates that the bleeding is closer to the anus, and it may be caused by mixed hemorrhoids, especially internal hemorrhoids, or it may be caused by anal fissures. Bleeding caused by anal fissures is usually bright red and appears as blood on the surface of the stool when wiping it. It may also be caused by rectal polyps or rectal adenomas. Long-term stool irritation can easily lead to rupture of the mucous membrane and blood vessels under the mucous membrane, which can lead to blood in the stool. If the color of blood in the stool is dark red, it indicates that the bleeding site is far from the anus. If the patient has a previous gastroduodenal ulcer, it may be caused by a bleeding gastroduodenal ulcer. There may also be small intestinal polyps, small intestinal diverticula, and sometimes malignant tumors of the colon or rectum can erode the submucosal vessels and cause blood in the stool. Therefore, after blood in the stool, we should analyze its color and speed, and perform anoscopy and, if necessary, colonoscopy, gastroscopy, and small intestine capsule endoscopy to clarify the cause and location of the bleeding.