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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.
As a result, whether warranted or not, bowel movement-related changes can be alarming to people and prompt a visceral reaction: “They get very concerned about diarrhea, constipation, poop color ...
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Bile overload is very rare, and not a health threat. 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 ...
Cecotropes are a group of small balls clumped together that look like a thin blackberry, which exit the anus all at once. They are dark, odorous, sticky and full of nutrition. [6] [9] Cecotropes differ from regular feces which are larger, exit the anus one at a time, smell only slightly, have very little moisture, and are a waste product. [6]
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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]
Black tarry poop may be a sign of bleeding in the upper part of the gut (stomach and first part of the small intestine) as blood becomes black as it travels through the gut, says Dr. LeBrett.