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Dark foods like beets, blueberries, dark licorice, and even a lot of spinach can cause your poop to look black, Dr. Farhadi says. “Dark foods contain certain dyes which can turn the food red or ...
Melena is a form of blood in stool which refers to the dark black, tarry feces that are commonly associated with upper gastrointestinal bleeding. [1] The black color and characteristic strong odor are caused by hemoglobin in the blood being altered by digestive enzymes and intestinal bacteria.
Blood in stool looks different depending on how early it enters the digestive tract—and thus how much digestive action it has been exposed to—and how much there is. The term can refer either to melena, with a black appearance, typically originating from upper gastrointestinal bleeding; or to hematochezia, with a red color, typically originating from lower gastrointestinal bleeding. [6]
Blood may be observed in vomit or in altered form as black stool. Depending on the amount of the blood loss, symptoms may include shock. Upper gastrointestinal bleeding can be caused by peptic ulcers, gastric erosions, esophageal varices, and rarer causes such as gastric cancer.
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By contrast, dark red or maroon blood may mean you are bleeding higher up in your colon, and black or tar-like stool suggests bleeding in your stomach from an ulcer, he notes. (Here’s why blood ...