What Causes Green Stool in Adults?

In adults, green stool is most commonly caused by dietary factors—such as excessive consumption of green-colored foods. Another potential cause is medication: taking bismuth-containing antacids or regularly using iron supplements may also result in green stool. In a small number of cases, green stool may be associated with underlying conditions such as indigestion or intestinal dysfunction. If you experience any discomfort or other symptoms, consult a healthcare provider for appropriate evaluation and targeted treatment.