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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. [2]
When black poop happens, family practitioners like Christine Traxler, MD, and pediatricians like Alison Mitzner, MD, are often the first ones their patients call. Just because your stool happens ...
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.
For example, if you have diarrhea, or loose, watery stools, that lasts longer than several days, it could be a sign of an infection or a condition such as celiac disease, irritable bowel syndrome ...
Sugar can make diarrhea worse because it causes the gut to release a lot of water, resulting in loose stools. Avoid sugary foods and drinks, even those with artificial sweeteners like stevia and ...
Digested blood from the upper gastrointestinal tract may appear black rather than red, resulting in "coffee ground" vomit or melena. [2] Other signs and symptoms include feeling tired, dizziness, and pale skin color. [18] A number of foods and medications can turn the stool either red or black in the absence of bleeding. [2]
An infection that affects your gut and triggers diarrhea can also cause green stool. “If you have an infection from bacteria like ... Pepto Bismol can temporarily turn stools black, as can iron ...
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