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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]
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] Other signs and symptoms include feeling tired, dizziness, and pale skin color. [18]
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]
Hematochezia is a form of blood in stool, in which fresh blood passes through the anus while defecating. It differs from melena, which commonly refers to blood in stool originating from upper gastrointestinal bleeding (UGIB). [1] The term derives from Greek αἷμα ("blood") and χέζειν ("to defaecate").
Definitions of dysentery can vary by region and by medical specialty. The U. S. Centers for Disease Control and Prevention (CDC) limits its definition to "diarrhea with visible blood". [19] Others define the term more broadly. [20] These differences in definition must be taken into account when defining mechanisms.
blood culture: bld: blood: BLE: Bilateral Lower Extremity (in/on both legs). BLS: basic life support: BM: bone marrow bowel movement breast milk Capillary blood glucose (British medical colloquialism originating from Boehringer Mannheim, a manufacturer of early glucose meters, today a part of Boehringer Ingelheim.) BMBx: Bone marrow biopsy: BMC ...
There are many different types of rectal discharge, but the most common presentation of a discharge is passage of mucus or pus wrapped around an otherwise normal bowel movement. [10] Rectal discharge has many causes, and may present with other symptoms: [10] [11] Staining of undergarments; Constant feeling of dampness around anus