Why is my poop green?
Green poop can be alarming to see, but it’s rarely a sign of anything serious. Stool gets its normal brown color from bile — a digestive fluid produced by your liver. As bile travels through your intestines, bacteria break it down, gradually turning it from green to brown.
When stool moves through your system faster than usual, bile doesn’t have time to fully break down, and the result is green-colored stool.
Common causes of green stool
Diet-related (most common)
- Leafy greens — Spinach, kale, broccoli, and other green vegetables contain chlorophyll that can tint your stool.
- Green food coloring — Found in candy, drinks, ice cream, and frosting.
- Matcha and green tea — Large quantities can affect stool color.
- Iron supplements — Can turn stool dark green or even black.
- Blueberries and purple foods — Sometimes appear green after digestion.
Digestive causes
- Fast transit time — When food moves quickly through the colon (due to diarrhea, stress, or illness), bile stays green.
- Antibiotics — Can disrupt gut bacteria that normally process bile.
- Food intolerances — Lactose intolerance or gluten sensitivity can speed up digestion.
- Stomach bugs — Viral or bacterial infections often cause green, watery stools.
Green poop in babies
Green stool in infants is very common and almost always normal:
- Breastfed babies — May have green, seedy stools, especially during foremilk/hindmilk imbalance.
- Formula-fed babies — Iron-fortified formulas often cause dark green stools.
- Starting solids — Green vegetables like peas and spinach will directly color stool.
When to worry about green poop
Green stool on its own is almost never dangerous. See a doctor if you also have:
- Persistent diarrhea lasting more than 3 days
- Blood or mucus in your stool
- Severe abdominal pain or cramping
- Fever above 101°F (38.3°C)
- Signs of dehydration — dark urine, dizziness, dry mouth
These combinations could indicate an infection, inflammatory bowel disease, or other conditions that need evaluation.
How to track stool color
Monitoring your stool color over time helps you spot patterns and separate harmless causes from persistent changes. With Flushy, you can log stool color alongside Bristol type and dietary tags to see what’s driving the change — all privately on your device.
This article is for informational purposes only and does not constitute medical advice. Consult a healthcare professional for personalized guidance.