What Causes Black or Tarry Stool? 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 Black, Green or Bloody: What's Up With My Poop? Diet vs Disease Navigating Stool Changes After Surgery Chronic Constipation: a Review of Current Literature Current Gastroenterology Reports Springer Nature Link Types of Poop: What Doctors Need You to Know The Healthy @Reader's Digest