Melena Stool Definition, Causes and More: Understand melena stool, dark and tarry stool often indicating upper gastrointestinal bleeding. Learn about potential causes and implications.: Arpilor, Mr. Leonardimer: 9798859376544: Amazon.com: Books Know Your Stool Physiology Video USMLE Step 1 What does your poop colour indicate? Pay attention. There's a lot to be learned by the colour and consistency of your stools, as well as the frequency and how easily passed Different stool colours can provide important clinical clues related to digestion, bleeding, liver disease, malabsorption, infection, or bowel inflammation. Disclaimer For educational purposes only. Not medical advice. Consult a qualified When is stool color concerning? Gastrointestinal disease Basicmedical Key