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“Unabsorbed iron can form complexes with compounds in your gastrointestinal tract that can lead to black stools,” says Samuel A. Akinyeye, M.D., assistant professor in the division of ...
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.
A diet high in fiber makes stool softer, while a low-fiber diet can cause hard, dry stools, Dr. Uradomo says. Fiber-rich foods include whole grains, fruits and vegetables.
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]
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]
Patients with irritable bowel syndrome commonly experience abdominal pain, changes to stool form, recurrent abdominal bloating and gas, [22] co-morbid disorders and alternation in bowel habits that caused diarrhea or constipation. [21] However, anxiety and tension can also be detected, although patients with irritable bowel disease seem healthy.
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