If you have blood in your stool, the amount of bleeding is bright red, which is caused by bleeding in the lower gastrointestinal tract, such as rectal polyps, hemorrhoids, anal fissure, colorectal cancer, and so on. 1. Rectal polyps: there will be fresh blood in the stool, the polyp may come out of the anus, and the stool will also change, become thin and thin. If it is a polyp, you need to go to the hospital immediately for examination. 2. Hemorrhoids: the stool is also bright red, some hemorrhoids will even prolapse, will feel anal itching, some will have pain. 3. Anal fissure: this disease is also accompanied by defecation with fresh blood, constipation will occur, and there will also be pain during defecation. 4. Colorectal cancer: besides bloody stools, mucous bloody stools may also occur, and constipation and diarrhea may appear alternately. Fresh blood stool is a symptom that should not be ignored, and you should go to the hospital in time, ask the doctor to clarify the cause of the disease, and deal with it accordingly.