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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.
Blood in stool is a hint that bleeding is present in the digestive tract. The bleeding is usually described either as dark in color or bright red blood on toilet tissue or stool. But in some occasions, the presence of blood can only be determined by a procedure known as fecal occult blood test. The causes of bloody stool can also be determined using several other diagnostic methods.