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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]
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]
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The Bristol stool scale is a medical aid designed to classify the form of human feces into seven categories. Sometimes referred to in the UK as the Meyers Scale, it was developed by K.W. Heaton at the University of Bristol and was first published in the Scandinavian Journal of Gastroenterology in 1997. [4]
Discussing the types of poop may seem disgusting or at least embarrassing, but paying attention to what’s coming out of you can give you great insight into your health. A bowel movement is the ...
Most patients who are eventually diagnosed with watermelon stomach come to a physician complaining of anemia and blood loss. [7] Sometimes, a patient may come to the physician because he or she notices blood in the stools—either melena (black and tarry stools) and/or hematochezia (red bloody stools).
If your stools are regularly much thinner than before, this may suggest a tumor in the colon, Inra said. Watch for other changes in your bowel habits, like constipation. 5. An unproductive urge to ...