Black stool? Bright red blood? Each tells a different story. I've explained what these signs indicate and when to seek help. Watch the video, and if you relate to any of these Melena: What Is It, Causes, Symptoms, Bleeding, Treatment, and More Osmosis Functional constipation in children: What physicians should know Stool Poop Color What it may mean Brown: In GrepMed Navigating Stool Changes After Surgery Poop Color Meaning: What Your Stool Color Can Tell You About Your Health