TummiPoop color meaning: a calm guide to stool colors
Food and medicines change the colour of your poop all the time, and most of the time it means nothing. Three colours are worth a closer look: black, red and pale. Here is a calm overview of what each colour can mean.
Short answer
Any shade of brown is normal, and green, orange or yellow after certain foods is usually harmless. Black and tarry, red that is not from food, and pale or clay coloured stool should be checked by a doctor. As Mayo Clinic puts it, stool colour is usually about diet and only rarely points to a serious problem.
Why is poop brown?
Your liver makes bile to help digest fat. Bile contains a yellowish pigment called bilirubin. On its way through the gut, bacteria break it down into brownish substances, and that gives stool its typical colour. When stool moves faster than usual, there is less time for this, so it can look lighter, yellow or green. When it moves slowly, it tends to be darker.
Poop color chart
| Colour | Common reasons | What to do |
|---|---|---|
| Brown | The usual colour. Bile and its breakdown products turn stool brown. | No action needed. |
| Dark brown | Iron tablets, coffee, or stool that moved slowly. | Usually normal. |
| Light brown | A lighter diet or a faster passage. | Usually normal. |
| Orange | Carrots, sweet potato and other foods rich in beta carotene, or orange food colouring. | Usually harmless. |
| Yellow | Fatty food, a fast passage. Greasy, foul smelling yellow stool that is hard to flush can mean fat is not absorbed well. | Mention it if it keeps happening. |
| Green | Leafy greens, green food colouring, iron supplements, or food moving through quickly, for example with diarrhea. | Usually harmless. |
| Black | Iron, bismuth (for example Pepto Bismol) or black liquorice. Black, sticky, tar like stool can mean bleeding higher up in the gut. | If not explained by iron, bismuth or food: urgent appointment the same day. |
| Red or maroon | Beetroot, cranberries, red food colouring. Red can also be blood, for example from haemorrhoids, a small tear or something that needs checking. | If it is not food: see a doctor. A lot of blood: emergency. |
| Pale, clay or grey | Can mean bile is not reaching the gut, for example because of a blockage. Some antacids and barium from X-ray tests can also cause it. | See a doctor, quickly if your skin or eyes turn yellow or your urine is dark. |
The colours in a little more detail
Why is my poop green?
Green is mostly harmless. Spinach, kale and other leafy greens, green smoothies, matcha, food colouring and iron supplements can all do it. Green also shows up when stool moves through quickly, for example during a bout of diarrhea, because bile has less time to turn brown.
Why is my poop yellow?
Occasional yellow stool often follows fatty meals or a fast passage. If your stool is often yellow, greasy, floats, smells very bad and is hard to flush, fat may not be absorbed properly. That can happen with conditions such as coeliac disease or problems of the pancreas, so mention it to a doctor if it keeps happening.
Is black poop dangerous?
Iron tablets, bismuth medicines and black liquorice commonly turn stool black, and that is harmless. Black stool that is sticky and looks like tar can mean bleeding in the stomach or upper gut. The NHS advises an urgent appointment the same day for black or dark red stool, and calling an emergency number if there is a lot of blood or you feel dizzy or weak.
What does red in my poop mean?
Think back first: beetroot, cranberries, tomato skins and red drinks can colour stool. If it is not food, red can be blood. Bright red blood on the paper is often from haemorrhoids or a small tear, but blood in the stool always deserves a check, because it can also be a sign of inflammation or bowel cancer.
What does pale or clay coloured poop mean?
Pale, grey or clay coloured stool can mean that bile is not reaching the gut, for example because a bile duct is blocked. If it happens more than once, see a doctor, and go quickly if your skin or the whites of your eyes turn yellow or your urine is dark. In babies, pale stool should always be checked by a paediatrician quickly.
What does healthy poop look like?
A useful picture to keep in mind: some shade of brown, formed and soft (Bristol type 3 or 4), passed without straining, no blood, and a rhythm that is normal for you, somewhere between three times a day and three times a week. Colour is just one clue. Shape, frequency and how you feel matter at least as much.
Keep track instead of guessing
If a colour worries you, write down when you saw it, what you ate in the two days before and which medicines or supplements you took. That alone often explains it. If it does not, your notes make the conversation with your doctor short and clear. A photo can help too, as long as it stays private.
Frequently asked questions
What color poop is bad?
Black and tarry stool, red stool that is not explained by food, and pale or clay coloured stool should be checked by a doctor. Black or dark red stool needs an urgent appointment the same day.
Why is my poop green?
Usually because of leafy greens, food colouring, iron supplements or food moving through quickly, for example with diarrhea. It is mostly harmless.
Why is my poop yellow?
Often after fatty meals or a fast passage. If it is often yellow, greasy and hard to flush, fat may not be absorbed well, so mention it to a doctor.
Does black poop always mean blood?
No. Iron tablets, bismuth medicines and black liquorice commonly cause black stool. Sticky, tar like black stool without such an explanation can mean bleeding and needs an urgent check.
What does healthy poop look like?
Brown, formed and soft (Bristol type 3 or 4), easy to pass, without blood, at a rhythm that is normal for you.
Sources
Related guides
Bristol stool chart
What each of the seven poop types means, which ones are normal and a free printable chart.
How often should you poop?
From three times a day to three times a week: what is normal and what changes your rhythm.
Bowel diary
What to write down, a free printable template and how to read your diary after two weeks.