Why is my poop green, black or pale?
General information, not health advice. Talk to your doctor or dietitian about your own symptoms.
Most color changes trace back to food or a medicine. A few colors should never be waited out.
Last updated 2026-10-31 ยท By Torstein Skulbru
The short version
Poop color usually comes down to food, a medicine, or how fast things moved through. Brown, green and yellow are common. Black, red and pale are different: read those three blocks below and do not wait them out.
Brown
- Usually means
- Brown is the usual color. Any shade from light to dark is common, and most of the time color comes down to what you ate.
- When to see a doctor
- Color alone is no reason.
Green
- Usually means
- Things moved fast. Very common with loose poop.
- Common food causes
- Spinach, kale and other leafy greens, and green food dye.
- When to see a doctor
- If it comes with diarrhea for more than a few days, or a fever, check in with a doctor.
Yellow
- Usually means
- Food moved through quickly, or the meal was rich or fatty. Common with loose poop.
- Common food causes
- Carrots, sweet potato, squash and fatty meals.
- When to see a doctor
- If it's yellow, greasy, floats and smells unusually bad for more than a few days, or you're losing weight, book a check-up.
Red or reddish
- Can come from
- Something red you ate or drank: beets, red food dye, tomato juice or cranberries. It can also be blood, so it is never worth guessing.
Worth a check-up
Most of the time it's something minor like piles (hemorrhoids), especially if it's bright red, but blood in poop should always be checked by a doctor.
If you can't link it to food, or you see blood in the bowl or on the paper, talk to a doctor. Blood in poop should always be checked.
A lot of blood, large clots, or bleeding that will not stop is an emergency. Call your local emergency number.
Black
- Usually means
- Most often iron tablets or bismuth (Pepto-Bismol). Both are very common causes.
- Common food causes
- Blueberries and other very dark foods.
Please get medical help today
Black, tar-like poop can be a sign of bleeding higher up in the gut.
If it's black and sticky like tar and you can't link it to iron, bismuth or food, get medical advice today. Don't wait.
Contact a doctor or urgent care now. If you feel faint, very unwell, or the pain is extreme, call your local emergency number.
Pale, grey or clay
- Usually means
- Pale poop usually means too little bile is reaching your gut. Some anti-diarrhea medicines can cause it, and very rarely dairy. Count it as worth mentioning to a doctor, not something to wait out.
Worth a check-up
Pale or clay-colored poop a few times in a row is worth mentioning to a doctor.
If it's pale more than once or twice in a row, book a check-up. If you also have yellow skin or eyes or dark pee, get medical advice today.
Pale poop together with yellow skin/eyes or dark pee should be checked quickly.
One rule that covers all of it
General information, not a diagnosis. If something seems off to you, trust that and talk to a doctor.
Sources
- Cleveland Clinic: Poop color. Food and medicine causes by color; contact a provider if the color does not go back to brown within a few days.
- Cleveland Clinic: Clay-colored or pale stool. Pale poop usually means too little bile; call a provider if it stays clay-colored for more than a few days.
- NHS: Symptoms of bowel cancer. Blood in poo can look red or black; black or dark red poo needs urgent advice; a lot of blood or large clots is an emergency. Used here only for the blood and black-poo advice.
- NHS: Jaundice. Yellow skin or eyes with darker pee and paler poo than usual.
- NHS: Side effects of ferrous sulfate. Darker poo is common with iron tablets; black, tar-like or red poo, or blood, needs medical advice.
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