Definition of green stool
Green stool — when your feces (poop) looks green — is usually the result of something you ate, such as spinach. Green stool also can occur after you consume certain medications or iron supplements.
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 and rarely cause for concern.
Causes of green stool
- Diet high in green vegetables such as spinach
- Food dyes
- Severe diarrhea
- Not finishing nursing entirely on one side, thus missing some of high-fat content breast milk, which affects the digestion of the milk
- Protein hydrolysate formula (for babies with milk or soy allergy)
- Lack of normal intestinal bacteria in breast-fed infants
- Indomethacin — a nonsteroidal anti-inflammatory drug
- Iron supplements
- Medroxyprogesterone (Depo-Provera), a contraceptive drug
When to see a doctor
Call your doctor if you or your child experiences green stool for more than a few days. Green stool often occurs with severe diarrhea, so drink plenty of fluids and seek immediate medical attention if you or your child becomes dehydrated.