Blood in the stool can be seen in a variety of diseases, blood in the stool is common should be alert to hemorrhoids, anal fissure, intestinal tumors and other diseases, need to be specifically analyzed. 1. Hemorrhoids: Hemorrhoids are the most common cause of blood in the stool. In the process of stool or after there will be dripping blood or ejection of blood, blood is bright red. It can be accompanied by symptoms such as hemorrhoidal prolapse, edema and pain. 2. Anal fissure: the bleeding of anal fissure is small, bright red in color, and there will be anal tearing pain during or after defecation, which is more intense. 3. Intestinal tumor: rectal tumor, colon tumor and other conditions can also cause blood in stool, which is often accompanied by weight loss, change of bowel habit and so on. When there is blood in stool, you need to consider intestinal polyps, colitis, etc., you should consult a doctor in time, clarify the cause as soon as possible, and standardize the treatment under the doctor’s guidance to prevent the delay of the condition.