Stool Poop Color What it may mean Brown: In GrepMed What poop color says about your health Baptist Health Jacksonville, FL Dark stool vs black stool the difference can be serious. Dark brown stool is often food or iron related. Black, tarry stool may indicate internal bleeding and needs urgent medical attention. Why Is My Stool Black? Symptoms, Causes & What To Do Next Melaena Causes Diagnoses Management TeachMeSurgery Foods That Cause Dark Stools and When to Be Concerned GoodRx