Stool Colors What Poop Colors Mean & When to Worry Buoy Foods That Cause Dark Stools and When to Be Concerned GoodRx Why Black Dark Brown Tarry Stool Appears After Wearing Hair Nets And How This One Product Changed My Experience 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 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