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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]
Plummer–Vinson syndrome (also known as Paterson–Kelly syndrome [1] or Paterson–Brown-Kelly syndrome in the UK [2]) is a rare disease characterized by dysphagia (difficulty swallowing), iron-deficiency anemia, glossitis (inflammation of the tongue), cheilosis (cracking at the corners of the mouth), and esophageal webs (thin membranes in the esophagus that can cause obstruction). [1]
Naproxen (Aleve)* has a long half-life in dogs and can cause gastrointestinal irritation, anemia, melena (digested blood in feces), and vomiting. [175] Antifreeze* is very dangerous to dogs and causes central nervous system depression and acute kidney injury. Treatment needs to be within eight hours of ingestion to be successful. [174]
An upper GI bleed is more common than lower GI bleed. [2] An upper GI bleed occurs in 50 to 150 per 100,000 adults per year. [8] A lower GI bleed is estimated to occur in 20 to 30 per 100,000 per year. [2] It results in about 300,000 hospital admissions a year in the United States. [1] Risk of death from a GI bleed is between 5% and 30%.
A feeling of pressure and squeezing in the chest is a serious indication that medical care is essential because chest pain and discomfort is one of the most common symptoms of heart attack in men.
Upper gastrointestinal bleeding affects around 50 to 150 people per 100,000 a year. It represents over 50% of cases of gastrointestinal bleeding. [ 2 ] A 1995 UK study found an estimated mortality risk of 11% in those admitted to hospital for gastrointestinal bleeding.
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.
Gastric antral vascular ectasia (GAVE) is an uncommon cause of chronic gastrointestinal bleeding or iron deficiency anemia. [1] [2] The condition is associated with dilated small blood vessels in the gastric antrum, which is a distal part of the stomach. [1] The dilated vessels result in intestinal bleeding. [3]