There are many clinical causes of bleeding in the stool, mainly the following: 1. Internal hemorrhoid bleeding: manifested as bleeding in the stool, bright red in color, in the shape of dripping blood, or in severe cases, in the shape of spraying, and can be accompanied by the nucleus of hemorrhoids prolapse. The surface of the hemorrhoid nucleus can be seen bleeding under the anoscope. 2.Anal fissure: It is manifested as painful tearing pain in the anus during stool, with less bleeding, bright red, mostly blood on hand paper. Inspection can find anal canal skin fissures. 3, rectal cancer: manifested as bleeding in dark red, or dark brown, can be accompanied by anal discomfort, weight loss, thinning of stool, change in stool habit, etc. Anal finger diagnosis can touch cauliflower-like swelling. In short, when you encounter bleeding in the stool do not think that it is hemorrhoids, do not take it seriously, and delay treatment.