Types of Poop: What Doctors Need You to Know The Healthy @Reader's Digest 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 Hematochezia vs melena: Comparing symptoms, causes, and treatment 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 Hematochezia vs melena: Comparing symptoms, causes, and treatment