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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]
“The tarry or stickiness of the stool and the smell are what differentiate true GI bleeding from other causes such as iron supplements, dark foods, and bismuth-containing medications,” he adds.
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]
Digested blood from the upper gastrointestinal tract may appear black rather than red, resulting in "coffee ground" vomit or melena. [2] Other signs and symptoms include feeling tired, dizziness, and pale skin color. [18] A number of foods and medications can turn the stool either red or black in the absence of bleeding. [2]
Related: Five Ways to Give Comfort to Your Senior Dog. Sources. Bouché TV, Coates JR, Moore SA, Faissler D, Rishniw M, Olby NJ. Diagnosis and management of dogs with degenerative myelopathy: A ...
Signs and symptoms of infection are gastritis, burning abdominal pain, weight loss, loss of appetite, bloating, burping, nausea, bloody vomit, and black tarry stools. Infection can be detected in a number of ways: GI X-rays, endoscopy, blood tests for anti- Helicobacter antibodies, a stool test, and a urease breath test (which is a by-product ...
Hematochezia is a form of blood in stool, in which fresh blood passes through the anus while defecating. It differs from melena, which commonly refers to blood in stool originating from upper gastrointestinal bleeding (UGIB). [1] The term derives from Greek αἷμα ("blood") and χέζειν ("to defaecate").
As you probably already know, there are many reasons why senior dogs start losing their housetraining and urinating in the house: Related: 16 Signs a Dog Is Dying: What to Do When Health Declines 1.