If the amount of blood in stool is relatively high, the following conditions should be considered: first, hemorrhoids, which is also the most common condition, characterized by high amount of blood in stool without obvious pain. The second is to consider whether the patient is over forty years of age. If the blood in the stool is more than forty years of age, the color is dark, accompanied by a feeling of falling or recent changes in bowel habits, colorectal cancer should be considered. Third, there are common inflammatory bowel diseases, including ulcerative colitis and Crohn’s disease, Crohn’s disease is relatively rare in China. While the incidence of ulcerative colitis is now significantly higher, it can also appear more blood in the stool during the active phase, which can be accompanied by abdominal pain, diarrhea or mucus and pus in the stool.