What diseases should be distinguished from blood in the stool? Blood in the stool is a typical symptom of internal hemorrhoids, especially early internal hemorrhoids, but it should not be assumed that blood in the stool is internal hemorrhoids. Blood in the stool is a common symptom, and many clinical diseases can cause blood in the stool. (1) Internal hemorrhoid bleeding: mostly seen in adults, painless fresh blood in the stool, mainly dripping and shooting blood. (2) Anal fissure bleeding: mostly seen in young and strong adults, severe anal pain during and after defecation, blood dripping from the stool or blood on the stool paper, bright red blood, mostly bleeding due to constipation, the amount is more or less. (3) rectal polyp bleeding: mostly seen in children, chronic painless stool with fresh blood, often mixed with mucus, such as polyps naturally fall off, can be a large amount of fresh blood in the stool. (4) intestinal bleeding: if the blood is dark red for high bleeding, bright red blood can be seen when the bleeding site is low or the bleeding volume is large, the bleeding can be mixed with feces or pus blood in stool, often with mucus, and can be accompanied by systemic symptoms such as fever, abdominal pain and increased number of stools. (5) Rectal cancer bleeding: mostly seen in people over 40 years old, can have poor defecation, increased number of stools, urgent and frequent pus and blood stools, etc. Occasionally, the tumor breaks down and there is a lot of blood in stool. The anus can be palpated with irregular shape, uneven surface, hard and immovable swelling, and dark red blood stained on the finger sleeve.