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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]
When there is significant blood loss over a short time, symptoms may include vomiting red blood, vomiting black blood, bloody stool, or black stool. [1] Small amounts of bleeding over a long time may cause iron-deficiency anemia resulting in feeling tired or heart-related chest pain. [1]
Blood may be observed in vomit or in altered form as black stool. Depending on the amount of the blood loss, symptoms may include shock. Upper gastrointestinal bleeding can be caused by peptic ulcers, gastric erosions, esophageal varices, and rarer causes such as gastric cancer.
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]
The basic and most common symptoms reported are blood in stool and blood in vomiting. Upper gastrointestinal bleeding then is reported, and is very commonly represented in elderly patients. [4] Black or bloody stools and hematemesis account for over three quarters of the case presentations.
Idiopathic constipation, when there is no known cause, ... Black beans. Black beans are a great option for plant-based burgers or fiber-rich dips. ... Blood in the stool. Nausea. Vomiting ...
The symptoms can include vomiting blood, melena (passing black, tarry stools); or passing maroon stools or frank blood in the stools. Many people with bleeding gastric varices present in shock due to the profound loss of blood.
In fact, calcium-containing antacids are known to cause changes in stool color. ... nausea and vomiting. dark urine. swelling in the ankles or legs. persistent itching. pain in the abdomen and back.
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