Bristol Stool Chart: How to Know if Your Poop Is Healthy
Learn what your poop says about your health with the Bristol Stool Chart, a simple guide to bowel movements.
Published on May 27, 2025
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You may not always peek into the toilet after you’ve used it, but the appearance of your poop can tell you a lot about your bowel health. No one type of poop is the gold standard — normal bowel movements can come in plenty of shapes and sizes.
“Stool consistencies and frequency may normally vary based on ingestion, hydration, stress, and medications,” says Adrienna Jirik, MD, a gastroenterologist at Cleveland Clinic in Ohio. A bowel movement’s texture, color, and consistency can point to constipation, diarrhea, or even hint at a gastrointestinal (GI) conditions like irritable bowel syndrome (IBS), Crohn’s disease, or ulcerative colitis.
One way to know if your poop is healthy or unhealthy is through the Bristol Stool Chart, which classifies poop by shape and texture.
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What Is the Bristol Stool Chart?
Frequently used by gastroenterologists, the Bristol Stool Chart identifies seven types of stools based on shape and consistency, with type 1 being the hardest and type 7 being the softest. Created in 1997 by Stephen Lewis, MD, MBChB, and Ken Heaton, MD, MBBChir, at the Bristol Royal Infirmary in England, this scale can give clues about bowel habits, how long stool is in your body, and any possible health issues you may have.
“The chart is highly reliable for assessing individual stool types and helps both clinicians and patients communicate clearly about bowel habits,” says Daksesh Patel, DO, a gastroenterologist in Evanston, Illinois. “Its simplicity and visual nature make it especially useful in clinical practice for tracking changes over time and guiding further assessment.”
Although not an officially recognized diagnostic tool on its own, it can help doctors catch possible symptoms associated with conditions like constipation, diarrhea, IBS, or other GI disorders, says Dr. Patel.
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Types of Poop on the Bristol Stool Chart
The seven types of poop listed on the Bristol Stool Chart range from hard lumps to watery fragments.
Type 1
Type 1 poop looks like hard lumps or small pebbles. These lumps can clump together and feel very painful or difficult to pass. This stool type suggests constipation. If you’re experiencing constipation, it can help to add fiber to your diet, drink more water, and exercise every day to help soften your bowel movements.
Type 2
Type 2 stools have more of a sausage shape, but can still be lumpy and hard. Your large intestine creates your poop by absorbing water and moving the remaining food along, but if it moves too slow, it can get hard, dry, and difficult to pass — a sign of constipation.
Type 3
Like type 2, type 3 poops are sausage-shaped, but they aren’t lumpy and they have cracks along the surface. “Stool types 3 and 4 on the Bristol Stool Chart are considered ideal. These stools are well-formed, easy to pass, and indicate a healthy digestive system,” says Patel.
Type 4
Type 4 bowel movements are thinner, smoother, and softer than type 3.Some describe them as resembling a thin sausage or a snake. “Maintaining stool consistency in the type 3 to 4 range is generally optimal for bowel health,” says Patel.
Type 5
Type 5 poop starts to get softer and looks like soft blobs with clear edges. They’re easy to pass, but can suggest a lack of fiber in the diet. If you pass type 5 stools on a regular basis, it may point to bowel issues but can also be considered in the range of normal. “Types 5 to 7 (soft to watery) suggest a tendency toward diarrhea or rapid transit through the colon,” says Patel.
Type 6
Type 6 poop looks mushy and fluffy, with ragged edges, and can mean you have diarrhea. This type can occur because of factors like stress, illness, food poisoning, or a GI condition.
Type 7
Type 7 is very watery and has no solid pieces. Passing liquid stools can also come with abdominal cramping and an urgent need to have a bowel movement.
When Should You See a Doctor?
Any change from your normal bowel habits should prompt a visit to your healthcare provider, says Dr. Jirik. Certain symptoms need quick medical attention, according to Jirik and Patel. They include:
- Persistent severe constipation or diarrhea (Bristol Stool Chart types 1 or 2, or 6 or 7)
- Blood in the stool or black, tarry stools
- Excessive mucus in the stool
- Persistent changes in bowel habits (such as chronic constipation or diarrhea)
- Very foul-smelling stools
- Sudden, significant changes in stool appearance or frequency
- Pencil-thin or ribbon-like stools (could suggest narrowing of the colon)
- Associated symptoms like abdominal pain, distended belly, rectal pain, nausea or vomiting, bloating, or unexplained weight loss
“If you experience any of these symptoms, or if your stool consistently falls outside the ideal type 3 to 4 range without an obvious dietary or lifestyle cause, you should consult a gastroenterologist for further evaluation,” says Patel.
The Takeaway
- The Bristol Stool Chart categorizes poop based on its shape and texture, which can give you important clues about your bowel health.
- With this tool, stools are labeled from type 1 to type 7, ranging from hard and dry to liquid and loose.
- See your healthcare provider if you have any significant changes in your normal bowel habits, especially if they’re persistent.
Resources We Trust
- Cleveland Clinic: Poop Shape, Color and Smell: What’s Healthy and What’s Not
- Mayo Clinic: Dietary Fiber: Essential for a Healthy Diet
- Bladder and Bowel Community: Bristol Stool Form Scale
- The Johns Hopkins University: 5 Things Your Poop Can Tell You About Your Health
- Mount Sinai: Should I Be Worried About Changes in My Stool?
EDITORIAL SOURCES
Everyday Health follows strict sourcing guidelines to ensure the accuracy of its content, outlined in our editorial policy. We use only trustworthy sources, including peer-reviewed studies, board-certified medical experts, patients with lived experience, and information from top institutions.
Resources
- Poop Shape, Color and Smell: What’s Healthy and What’s Not. Cleveland Clinic. February 11, 2022.
- 5 Things Your Poop Can Tell You About Your Health. Johns Hopkins Medicine.
- Bristol Stool Form Scale. Bladder and Bowel Support.
- Shokouhi N et al. Development of a New Version of the Bristol Stool Form Scale: Translation, Content Validity, Face Validity, and Reliability of the Persian Version. BMJ Open Gastroenterology. December 2022.
- Lewis SJ et al. Stool Form Scale as a Useful Guide to Intestinal Transit Time. Scandinavian Journal of Gastroenterology. April 1997.
- Constipation. Cleveland Clinic. July 18, 2023.
- Azzouz LL et al. Physiology, Large Intestine. StatPearls. July 31, 2023.
- Brodkey FD et al. Constipation - Self-Care. MedlinePlus. July 15, 2024.
- Diarrhea. MedlinePlus. March 19, 2025.
- Changes in Bowel Habits. Cleveland Clinic. September 21, 2023.
- Frequent Bowel Movements. Mayo Clinic. October 31, 2024.
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