There are many reasons for the appearance of blood in the stool, and there can be several. 1, if the color of blood in the stool is bright red, it is possible that mixed hemorrhoids cause bleeding. The actual fact is that you can find a lot of people who are not able to get a good deal on a lot of things. 3, if the patient has rectal malignant tumor, will also lead to blood in the stool, should actively perform rectal finger diagnosis, if necessary, can be placed in the anoscope, colonoscopy to clarify. If the stool bleeding is dark red, it suggests that it may be upper gastrointestinal bleeding, trace the medical history, whether there is a history of epigastric pain, if necessary, you can perform gastroscopy to exclude whether there is gastroduodenal ulcer; you can also perform small intestine capsule endoscopy to exclude whether there is small intestine diverticulum, small intestine polyps, these diseases can also lead to stool bleeding.