Colorectal polyps can also cause blood in the stool, usually accompanied by abdominal pain and diarrhea; 4. Ulcerative colitis can also cause blood in the stool, usually accompanied by abdominal pain, mucus-purulent stool and other symptoms; 5. In men older than 40 years old, do not ignore the possibility of malignant colorectal tumors, usually the color of blood in the stool is obscure, but if the tumor location is very low, the color of blood in the stool may also be fresh, usually also The blood in the stool is usually dark in color, but if the tumor is very low, the color of the blood in the stool may also be fresh, and it is usually accompanied by a feeling of anal swelling, recent change in stool habit or constipation, abdominal pain and other symptoms. Therefore, men should not ignore the occurrence of blood in stool, but should go to the anorectal department of regular hospital in time to identify the cause and treat accordingly.