What Causes Stool Color Changes?
Stool color changes can occur for a variety of reasons, such as, suggests an underlying medical condition; substances that are added to stool; changes to substances normally present in stool; taking, eating, or drinking of certain liquids, foods, or medications.
Examples of colors of stools and the causes include:
- Black, tarry, sticky stools: Gastritis (bleeding from the stomach)
- Black stools (no odor, not sticky): Medications like iron pills or bismuth-containing medications (Pepto-Bismol)
- Yellow stools: Celiac disease, pancreatic cancer