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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 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]
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.
Problems as simple as serious diarrhea may cause blood in one's stool. Black stools caused by the presence of blood usually indicate a problem in the intestines (the black color is a sign of digested blood), whereas red streaks of blood in stool usually are caused by bleeding in the rectum or anus.
For example, if you have diarrhea, or loose, watery stools, that lasts longer than several days, it could be a sign of an infection or a condition such as celiac disease, irritable bowel syndrome ...
The Crohn's Disease Activity Index (CDAI) is a scoring system to assess the symptoms associated with Crohn's disease. It assigns a score based on eight clinical factors, including overall well-being, frequency of loose stools, abdominal pain, presence of abdominal masses, changes in weight, low hemoglobin levels, and use of opiates for diarrhea ...
What it is: A highly contagious virus that causes vomiting and diarrhea. What the symptoms are: Norovirus causes nausea, vomiting, diarrhea and abdominal pain. “It usually resolves within two to ...
Shigellosis, known historically as dysentery, is an infection of the intestines caused by Shigella bacteria. [1] [3] Symptoms generally start one to two days after exposure and include diarrhea, fever, abdominal pain, and feeling the need to pass stools even when the bowels are empty. [1]