MALENA: Melena is the medical term for black, tarry stools caused by the presence of digested blood. It typically indicates bleeding in the upper gastrointestinal (GI) tract, such as the: Stomach Duodenum Why Black Dark Brown Tarry Stool Appears After Wearing Hair Nets And How This One Product Changed My Experience The Quantity of Blood Required to Produce a Tarry Stool. How much? Melena, characterized by black tarry stools, can occur with as little as 50 cc of blood in the stomach. How Black or Tarry Stools UF Health When is stool color concerning?
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