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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.
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] Bismuth found in many antacids may turn stools black as may activated charcoal. [2]
Other symptoms are less common among people with COVID-19. Some people experience gastrointestinal symptoms such as loss of appetite , diarrhea , nausea or vomiting . [ 1 ] [ 65 ] A June 2020 systematic review reported a 8–12% prevalence of diarrhea, and 3–10% for nausea.
The most recent COVID-19 vaccine should offer protection against the XEC variant, Russo says. “The most recent version of the vaccine seems to be reasonably well-matched,” he says.
A coronavirus named SARS-CoV-2 causes COVID-19, while an influenza viruses is the source of flu. Flu and COVID-19 have some of the same symptoms, making it difficult to differentiate between the ...
Doctors explain the incubation period of COVID-19, what the symptoms are, ... (meaning that symptoms are similar to the common cold or flu), people tend to get better on their own after a few days ...
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 most common form of dysentery is bacillary dysentery, which is typically a mild sickness, causing symptoms normally consisting of mild abdominal pains and frequent passage of loose stools or diarrhea. Symptoms normally present themselves after 1–3 days, and are usually no longer present after a week.