Gastrointestinal Disease in Mastocytosis Immunology and Allergy Clinics What does your poop colour indicate? Pay attention. There's a lot to be learned by the colour and consistency of your stools, as well as the frequency and how easily passed Melena, Causes, Signs and Symptoms, Diagnosis and Treatment YouTube Chronic diarrhoea and fatty stools Abdominal Key What Your Poop Color Reveals About Your Health 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.