Dark Stool Causes: Understanding Color Changes Stool Colors and What They Can Tell You Your stool color can carry important clues about digestion, diet, or even disease. Most shades are harmless, but some changes signal the need for Healthy Poop Chart: Is Your Poop Normal? Nikki Yelton RD GASTROINTESTINAL HEMORRHAGE (2): Melena. Melena, the passage of black, tarry stools, usually implies blood loss greater than 500 ml originating anywhere between the oropharynx and the right hemicolon. Melena occurs most often, 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 Your Poop Is Talking .. Are You Listening? Your stool is your gut's daily report card. The shape, color, and texture tell you exactly what's going on inside. Here's a quick doctor style