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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]
Dysentery (UK: / ˈ d ɪ s ən t ər i / DISS-ən-tər-ee, [7] US: / ˈ d ɪ s ən t ɛr i / DISS-ən-terr-ee), [8] historically known as the bloody flux, [9] is a type of gastroenteritis that results in bloody diarrhea.
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HMPV is a type of virus that can cause upper and lower respiratory disease in people, according to the Centers for Disease Control and Prevention (CDC). Anyone can contract HMPV. But, younger ...
The CDC also says there are no known cases outside of Rwanda, and the risk of infection with this virus in the U.S. is low. Marburg is spread through contact with Egyptian rousette bats, or by ...
Hematemesis, melena, and hematochezia are symptoms of acute gastrointestinal bleeding. Bleeding that brings the patient to the physician is a potential emergency and must be considered as such until its seriousness can be evaluated.
It’s a common virus that causes illness in the upper and lower respiratory tracts, Dr. William Schaffner, a professor of infectious disease at the Vanderbilt University Medical Center, tells ...