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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]
By contrast, dark red or maroon blood may mean you are bleeding higher up in your colon, and black or tar-like stool suggests bleeding in your stomach from an ulcer, he notes.
Either way, your stool will lack the pigmentation that makes it appear brown by the time it exits your body. One of the three organs that make up the biliary system may be the culprit, according ...
Shigella results in about 165 million cases of diarrhea and 1.1 million deaths a year with nearly all cases in the developing world. [5] In areas with poor sanitation nearly half of cases of diarrhea are due to Entamoeba histolytica. [6] Entamoeba histolytica affects millions of people and results in more than 55,000 deaths a year. [12]
Human feces photographed in a toilet, shortly after defecation.. Human feces (American English) or faeces (British English), commonly and in medical literature more often called stool, [1] are the solid or semisolid remains of food that could not be digested or absorbed in the small intestine of humans, but has been further broken down by bacteria in the large intestine.
Gastroenteritis, also known as infectious diarrhea, is an inflammation of the gastrointestinal tract including the stomach and intestine. [8] Symptoms may include diarrhea , vomiting , and abdominal pain . [ 1 ]
Diarrhea is defined by the World Health Organization as having three or more loose or liquid stools per day, or as having more stools than is normal for that person. [2] Acute diarrhea is defined as an abnormally frequent discharge of semisolid or fluid fecal matter from the bowel, lasting less than 14 days, by World Gastroenterology ...