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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. [2]
If your black stool looks tarry or sticky and has a strong smell, it might be melena. Melena means you’re bleeding somewhere inside. Internal bleeding is always serious, especially when you can’t tell if it’s stopped.
20 lip 2021 · Melena appears as black, tar-like, sticky stools. The black color is caused by enzymes breaking down and digesting the blood as it moves through the GI tract. This color is often accompanied by a strong, foul odor.
30 lis 2022 · Melaena refers to a black tarry stool, which occurs as a result of upper gastrointestinal bleeding. Only 50mL of blood is needed to turn the stool black (a by-product of digested haemoglobin).
1 kwi 2024 · Melena is when blood causes stools to appear black, tarry, and foul-smelling. The blood is dark because it is coming from somewhere in the upper digestive system, including the esophagus (food tube), stomach, and small intestine.
Hematochezia is often visible and can range from streaks of blood on the surface of stools to blood coating the stool or mixed within it. Melena. Melena, on the other hand, refers to the passage of black, tarry, and foul-smelling stools.
27 mar 2018 · Melena causes black, tarry stools that are easy to distinguish from the brighter red associated with hematochezia. The blood is usually jet-black, similar to ink from a black ballpoint pen.
