The presence of bright red blood in the stool is considered to be related to the following diseases: 1. It may be hemorrhoids, in which a small amount of blood of bright red color appears during or after the stool, which cannot be mixed with the stool, in the form of dripping or spraying. 2. It may be anal fissure, in which a tearing painful sensation occurs during the stool, which lasts until some time after the stool, and the bleeding is bright red in color, dripping out one by one, or found when wiping. The typical symptoms are painless stool, bright red blood, and blood that does not mix with stool. 4. In addition, there may be bleeding from the colon and small intestine, because the situation is complicated, it is best to go to the hospital for examination in time.