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Blood in the stool can be bright red, maroon in color, black and tarry, or occult (not visible to the naked eye). Causes of blood in the stool range from harmless, annoying conditions of the gastrointestinal tract such as hemorrhoids to serious conditions such as cancer.
Bloody stool (stool that is very red or has streaks of bright red blood in it) is called hematochezia and usually originates from the colon or rectum. Melena on the other hand, is generally caused by bleeding within the stomach or small intestine. Various Causes of Black Stool. But what causes this upper digestive bleeding in the first place?