There are many causes of bright red blood in the stool, as follows: 1. Anal fissures, which tend to carry bright red blood on hand paper. Anal fissure is easier to identify, blood in the stool or stool can be accompanied by painful symptoms, often tearing pain in the anus; 2, hemorrhoids, especially internal hemorrhoids, internal hemorrhoids bleeding can be accompanied by pain, or painless bright red bloody stool, blood is bright red. Hemorrhoids are easier to identify, and many people have hemorrhoid bleeding mostly in the form of dripping, such as before defecation, the stool begins to drip fresh blood, and after the stool there are dripping bright red bloody liquid; 3, enteritis, such as ulcerative colitis, proctitis, can have fresh blood stool or mucus blood stool, ulcerative colitis blood stool is mostly accompanied by changes in stool properties; 4, rectal cancer, can also appear bright red blood stool, but rectal cancer is usually painless in the early stage, to be distinguished from hemorrhoids, anal fissure, etc. The differential diagnosis should be made with benign diseases such as hemorrhoids and anal fissures. If bright red blood stool occurs, it is recommended to go to the hospital for a clear diagnosis.