Stool color is usually explained by diet, but certain shades — especially tarry black or unexplained bright red — can signal a condition that needs medical attention.
If you haven't had any leafy green vegetables or foods with green dye lately, the explanation for green bowel movements might not be as innocent. If you don't recall eating any foods that might turn things a different shade, you could be having digestive issues. Bowel movements are typically brown in color because the bile in your digestive tract turns them that shade. Green stool in this case suggests food moved through your digestive tract too quickly for bile pigments to fully break down — a transit issue rather than a sign that something is wrong with bile production itself. Typically, this cause of green bowel movements would also cause them to be watery or runny.

This site offers information designed for educational purposes only. You should not rely on any information on this site as a substitute for professional medical advice, diagnosis, treatment, or as a substitute for, professional counseling care, advice, diagnosis, or treatment. If you have any concerns or questions about your health, you should always consult with a physician or other healthcare professional.