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Causes of blood in the stool range from harmless, annoying conditions of the gastrointestinal tract such as hemorrhoids and anal tears from straining against hard stools with constipation to serious conditions such as cancer. Blood in the stool should be evaluated by a health-care professional. Rectal bleeding (known medically as hematochezia) refers to passage of bright red blood from the anus, often mixed with stool and/or blood clots. Most rectal bleeding comes from the colon, rectum, or anus.
Significance of Blood in the Stool. Blood in the stool is typically due to hemorrhoids or anal fissures, which is a tear in the lining of the anus. Both of these causes are easily remedied and are not serious. Blood in the stool can also indicate colon polyps, colon cancer, colitis and diverticulitis, and these are all diseases that require medical attention.