Green stool — when your feces look green — is usually the result of something you ate, such as spinach. Certain medications or iron supplements can also cause green stool.
Newborns pass a dark green stool called meconium, and breast-fed infants often produce yellow-green stools. In older children and adults, green stool is uncommon. It’s rarely cause for concern.
- Cunningham FG, et al. The newborn. In: Williams Obstetrics. 24th ed. New York, N.Y.: The McGraw-Hill Companies; 2014. http://www.accessmedicine.com. Accessed April 7, 2015.
- Lake AM. Food protein-induced proctitis/colitis and enteropathy of infancy. http://www.uptodate.com/home. Accessed April 7, 2015.
- Schaner RJ, et al. Initiation of breastfeeding. http://www.uptodate.com/home. Accessed April 7, 2015.
- Fischbach FT, et al. Stool studies. In: A Manual of Laboratory and Diagnostic Tests. 9th ed. Philadelphia, Pa.: Lippincott Williams & Wilkins; 2014.