The appearance of your stool can provide useful clues about your digestive health, although a single change is often due to diet and isn’t necessarily a sign of disease.
Here’s what different characteristics can suggest:
| Stool appearance | Possible meaning |
|---|---|
| Brown | Normal. The color comes from bile pigments that change as food moves through the intestines. |
| Green | May occur after eating leafy greens, food coloring, or when stool passes through the intestines more quickly than usual (such as with diarrhea). |
| Yellow, greasy, or foul-smelling | Can indicate poor fat absorption and may warrant medical evaluation if persistent. |
| Black, tarry | Can result from iron supplements or certain medications, but it may also indicate bleeding in the upper digestive tract and should be evaluated promptly if unexplained. |
| Bright red | May be caused by hemorrhoids or an anal fissure, but it can also indicate bleeding from the lower digestive tract. |
| Pale or clay-colored | May suggest a problem with bile flow and should be assessed, especially if persistent. |
The shape and consistency matter too. The Bristol Stool Chart is commonly used to describe stool:
- Types 3–4 are generally considered normal.
- Types 1–2 may suggest constipation.
- Types 5–7 may indicate diarrhea or rapid intestinal transit.
You should seek medical care if you have:
- Black or bloody stools without an obvious explanation.
- Persistent diarrhea or constipation lasting more than a few weeks.
- Severe abdominal pain, fever, or vomiting.
- Unintentional weight loss or ongoing changes in bowel habits.
- Pale stools accompanied by dark urine or yellowing of the skin or eyes.
While stool can offer clues about health, it cannot diagnose a condition on its own. Persistent or concerning changes should be evaluated by a healthcare professional.
