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Rapid bleeding may cause syncope. [18] The presence of bright red blood in stool, known as hematochezia, typically indicates lower gastrointestinal bleeding. Digested blood from the upper gastrointestinal tract may appear black rather than red, resulting in "coffee ground" vomit or melena. [2]
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.
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.
Fecal vomiting or copremesis is a kind of vomiting wherein the material vomited is of fecal origin. It is a common symptom of gastrojejunocolic fistula and intestinal obstruction in the ileum . [ 1 ] [ 2 ] Fecal vomiting is often accompanied by gastrointestinal symptoms, including abdominal pain , abdominal distension , dehydration , and diarrhea .
Coffee-ground-like vomit suggests less severe bleeding in the stomach because the gastric acid has had time to change the composition of the blood; Yellow or green vomit suggests bile, indicating that the pyloric valve is open and bile is flowing into the stomach from the duodenum. This may occur during successive episodes of vomiting after the ...
The first indication of iron poisoning occurs within the first six hours post-ingestion and involves gastrointestinal symptoms including abdominal pain accompanied by nausea and vomiting with or without blood. Due to the disintegration of iron tablets, the stool may appear as black or dark green or gray. [4]
Melasma affects up to 33 percent of men and women. Read on to learn what causes the chronic skin condition and what you can do to keep it at bay.
The cause of dysentery is usually the bacteria from genus Shigella, in which case it is known as shigellosis, or the amoeba Entamoeba histolytica; then it is called amoebiasis. [1] Other causes may include certain chemicals, other bacteria, other protozoa, or parasitic worms. [2] It may spread between people. [4]