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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.
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]
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 ...
Problems as simple as serious diarrhea may cause blood in one's stool. Black stools caused by the presence of blood usually indicate a problem in the intestines (the black color is a sign of digested blood), whereas red streaks of blood in stool usually are caused by bleeding in the rectum or anus.
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 ...
The stool of a person with a lower gastrointestinal bleed is a good (but not infallible) indication of where the bleeding is occurring. Black tarry appearing stools medically referred to as melena usually indicates blood that has been in the GI tract for at least 8 hours. [1]
An infection that affects your gut and triggers diarrhea can also cause green stool. “If you have an infection from bacteria like salmonella, E. coli, ... Red, black, and white poop should be ...
The strongest predictors of an upper gastrointestinal bleed are black stool, age <50 years, and blood urea nitrogen/creatinine ratio 30 or more. [8] [9] The diagnosis of upper gastrointestinal bleeding is assumed when hematemesis (vomiting of blood) is observed. [citation needed]
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