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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.
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.
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]
In fact, calcium-containing antacids are known to cause changes in stool color. ... dark urine. swelling in the ankles or legs. persistent itching. pain in the abdomen and back.
What the symptoms are: Lethargy, nausea, vomiting, loss of appetite, joint pain and dark-colored urine are all common symptoms. Clay- or gray-colored stool, as well as intense itching and ...
A number of foods and medications can turn the stool either red or black in the absence of bleeding. [2] Bismuth found in many antacids may turn stools black as may activated charcoal. [2] Blood from the vagina or urinary tract may also be confused with blood in the stool. [2]
The absence of bile secretion can cause the feces to turn gray or pale. Bile is responsible for the brownish color of feces. Bile is responsible for the brownish color of feces. In addition to this, bile also plays a role in fat absorption, where dietary lipids are combined so that pancreatic lipases can hydrolyze them before going towards the ...
Acute esophageal necrosis (AEN), black esophagus, or Gurvits syndrome is a rare esophageal disorder. AEN defines itself with dark pigmentation of the esophagus , found during an upper gastrointestinal endoscopy . [ 2 ]