What is blood in stool?

Many answers. There are many causes of blood in the stool. Some like rectal fissure or hemorrhoids are uncomfortable but are generally benign. Others like cancer or inflammatory bowel disease generally carry a more serious prognosis. Either way, if you have blood when you have a bowel movement (bm), you should see a doctor for further evaluation.
Blood in stool. Possible causes of blood in stool include: fissures, fistulas, hemorrhoids, cancer, ulcers, infections, inflammation, Diverticular disease & Angiodysplasia . Get evaluated if more than a one time occurrence.