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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]
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.
Those with rectal bleeding may notice bright red blood in their stool. Symptoms associated with rectal bleeding include having several bowel movements in a day, feelings of incomplete rectal evacuation, straining, hard or lumpy stools, feelings of urgency, loose or watery stools, and leakage of bowel movement. [2]
Dysentery (UK: / ˈ d ɪ s ən t ər i / DISS-ən-tər-ee, [7] US: / ˈ d ɪ s ən t ɛr i / DISS-ən-terr-ee), [8] historically known as the bloody flux, [9] is a type of gastroenteritis that results in bloody diarrhea. [1] [10] Other symptoms may include fever, abdominal pain, and a feeling of incomplete defecation. [2] [6] [11] Complications ...
Strongly associated with anal intercourse. Symptoms include soreness, itching, bloody or pus-like discharge, or diarrhea. Chlamydia (chlamydia proctitis) Accounts for twenty percent of cases. People may show no symptoms, mild symptoms, or severe symptoms. Mild symptoms include rectal pain with bowel movements, rectal discharge, and cramping
In addition, patients with cuffitis often present with small volume bloody bowel movements. [2] Often, cuffitis can produce the appearance of bright red blood on tissue. [ 1 ]
Gastrointestinal bleeding from the upper tract occurs in 50 to 150 per 100,000 adults per year. [8] It is more common than lower gastrointestinal bleeding which is estimated to occur at the rate of 20 to 30 per 100,000 per year. [2] Risk of bleeding is more common in males and increases with age. [2]
The extent of diarrhea is graded based on severity, from 1 to 5. Grade 1 diarrhea is defined by an increase in the number of stools below four per day (compared with baseline). Grade 2 diarrhea is defined by an increase of 4–6 bowel movements per day. Grade 3 diarrhea is defined by an increase by 7 or more bowel movements per day.