Bristol Stool Chart Explained: What the 7 Types Mean

A bowel movement may look harder, softer or less formed than usual. You may recognize that something has changed but struggle to describe it to a healthcare provider. Stool isn’t always easy to discuss, and words such as “loose” or “hard” can mean different things to different people.

The Bristol Stool Chart provides a shared way to describe stool form and consistency. Also called the Bristol Stool Scale or Bristol Stool Form Scale, it groups bowel movements into seven types. The scale ranges from separate hard lumps to entirely watery stool. It can help you spot patterns and explain changes, but it cannot diagnose a health condition by itself.^1,2

This guide explains what all seven Bristol stool types mean, which types are generally considered well-formed, how stool consistency can affect bowel control and when to contact a healthcare provider.

What Is the Bristol Stool Chart?

The Bristol Stool Chart is a seven-point scale used to classify stool by its shape and consistency.^1,2 Researchers Stephen Lewis and Ken Heaton developed the scale while studying the connection between stool form and how quickly waste moves through the digestive tract.²

The chart gives patients and healthcare providers more specific language for discussing bowel movements. Instead of saying that a stool was simply “different,” you can describe it as Type 2, Type 5 or another recognizable form.

Stool form can provide general clues about how quickly or slowly waste is moving through the digestive tract. It cannot measure that movement precisely or explain the cause of a change. The chart also doesn’t cover other important signs, such as blood, mucus, pain, urgency, leakage or a change in how often you have a bowel movement.^1,2

What Do the 7 Bristol Stool Types Mean?

Bristol stool types 1 through 7 range from very hard and separated to entirely liquid. Types 1 and 2 may occur with constipation. Types 3 and 4 are generally well-formed. Type 5 is softer, while Types 6 and 7 are associated with loose stool or diarrhea.¹

Bristol Stool Type Comparison

Bristol Stool Types 1 and 2: Hard Stool and Constipation Patterns

Types 1 and 2 are hard, dry or lumpy. They may be associated with constipation and slower movement through the bowel.^1,2 These stools may be uncomfortable or difficult to pass.

An occasional hard stool can happen after a change in routine, diet, fluid intake or physical activity. Medications and supplements can also contribute. Iron supplements, some antacids, certain antidepressants and opioid pain medicines are among the products that may worsen constipation.³

Constipation involves more than stool appearance. It may include straining, difficulty passing stool, a feeling that some stool remains or fewer bowel movements than usual.³ Talk with a healthcare provider if hard stools or straining become a regular problem.

Bristol Stool Types 3 and 4: Generally Well-Formed Stool

Types 3 and 4 are generally considered well-formed and easier to pass.¹ Type 3 has cracks on the surface. Type 4 is smoother and softer.

That doesn’t mean every healthy bowel movement must be Type 4. People have different usual patterns, and an occasional variation may not signal a problem. Also consider whether the stool passes comfortably, how often you go, and whether you’re experiencing urgency or leakage.

Bristol Stool Type 5: Softer, Looser Stool

Type 5 consists of soft pieces with defined edges. It is less formed than Types 3 and 4 but isn’t mushy or watery.

An occasional Type 5 bowel movement may happen without signaling a medical problem. If it becomes a regular pattern, pay attention to other changes. These may include having bowel movements more often, feeling a sudden urge, experiencing pain or leakage, or noticing a connection to a change in diet or medication.

These details give your healthcare provider more useful information than the stool type alone.

Bristol Stool Types 6 and 7: Loose or Watery Stool

Type 6 is mushy with ragged edges. Type 7 is watery and contains no solid pieces. These forms are consistent with loose stool or diarrhea.^1,4

Diarrhea may be related to a short-term infection, a medication side effect, a food allergy or intolerance, or a digestive condition.⁴ One loose bowel movement isn’t necessarily diarrhea. How often it happens and how different it is from your usual pattern also matter.

Loose or watery stool can create more urgency and may be harder to hold than formed stool.⁵ Contact a healthcare provider if symptoms are severe, continue for more than a short time or occur with dehydration, blood, black stool or significant pain.⁴

What Stool Type Is Considered Healthy?

Stool form alone cannot determine whether a bowel movement is healthy, though. Your usual frequency, comfort, urgency, bowel control, and accompanying symptoms also matter. A lasting change from your normal pattern may be more important than moving between two nearby types.

One Bowel Movement Does Not Tell the Whole Story

Look for a recurring pattern and consider how you feel before, during and after a bowel movement. One Type 1, Type 5 or Type 6 stool does not diagnose constipation, diarrhea or another digestive condition.

What Can Change Stool Consistency?

Stool consistency can change as food and waste move through the digestive tract. The Bristol Stool Chart can help describe the change, but it cannot identify the cause on its own.

Diet and Fiber

A change in the amount or type of food you eat—including your fiber intake—may affect stool firmness and bowel regularity.

Fluid Intake

Not getting enough fluid can contribute to constipation in some people. Diarrhea can cause the body to lose fluids and electrolytes.^3,4

Medications and Supplements

Some medicines and supplements may contribute to constipation. Others may cause loose stool. Don’t stop taking a prescribed medication without talking with the healthcare provider who prescribed it.

Activity and Routine

Travel, reduced movement, schedule changes and delaying a bowel movement can affect bowel habits.³

Short-Term Illness

Infections can cause diarrhea. Other symptoms may include abdominal discomfort, nausea, fever or vomiting.⁴

Digestive Function

Stress and conditions that affect digestion, absorption, or bowel movement may change stool consistency. A healthcare provider can look at your full symptom pattern rather than relying on stool appearance alone.

How Can Stool Consistency Affect Urgency and Bowel Leakage?

Loose or watery stool can fill the rectum quickly and may be harder to hold than formed stool. This can contribute to a sudden urge or accidental bowel leakage, also called fecal incontinence or bowel incontinence.⁵

Constipation can also occur with leakage. Hard stool may remain in the rectum while softer or watery stool passes around it. This is sometimes called overflow leakage.^5,6

Stool consistency is one part of a bowel leakage evaluation, but it isn’t the only factor. Bowel control also depends on the muscles and nerves used to hold stool. A person’s mobility, awareness of the need to go and access to a bathroom may also play a role.^5,6

Talk with a healthcare provider about leakage that is new, recurring, or difficult to explain. Simply trying to make the stool firmer or softer may not address the cause.

How to Use the Bristol Stool Chart to Track Bowel Changes

A short bowel record can help you notice a pattern and explain it to your healthcare provider. You don’t need to track every bowel movement indefinitely. A record kept during a period of change can provide useful context.

Bring the record to your appointment if the change continues. It may help your provider understand whether the problem is isolated, recurring, or connected to another symptom.

When Should You Contact a Healthcare Provider About Stool Changes?

An occasional change in stool consistency can happen. Contact a healthcare provider when the change continues, keeps returning or occurs with other symptoms.

Make a routine appointment if you experience:

• A lasting change from your usual bowel pattern
• Recurring constipation or diarrhea
• Frequent urgency
• New or worsening bowel leakage
• Regular straining or painful bowel movements
• Symptoms that interfere with work, travel, sleep or everyday activities^3–5

Bleeding and black stool can have different causes, including certain medicines or supplements. These changes shouldn’t be evaluated using the Bristol Stool Chart alone.

What Happens When Stool Changes Contribute to Bowel Leakage?

A healthcare provider may ask about:

• Your usual stool pattern and recent changes
• Your diet and fluid intake
• Prescription medications and supplements
• Constipation, diarrhea or possible overflow leakage
• The muscles involved in bowel control
• Your mobility and access to a bathroom
• Surgeries, childbirth injuries and other health conditions^5,6

Treatment depends on what is contributing to the leakage. Your healthcare provider may recommend changes to your diet or fiber intake, a medication review, a bowel routine, pelvic floor therapy or another conservative option. Some people may need testing or a referral to a digestive health, colorectal or pelvic floor specialist.

Bristol Stool Chart FAQs

What is the Bristol Stool Chart?

The Bristol Stool Chart is a seven-point scale that organizes stool by shape and consistency. It ranges from separate hard lumps at Type 1 to entirely watery stool at Type 7. Patients and healthcare providers can use it to describe bowel movements and track changes.^1,2

What Bristol stool type is considered healthy?

Types 3 and 4 are generally considered well-formed or ideal on the Bristol Stool Scale.¹ However, stool form is only one part of bowel health. Comfort, frequency, urgency, ease of passage, bowel control and changes from your normal pattern also matter.

What do Bristol stool Types 1 and 2 mean?

Types 1 and 2 describe hard or lumpy stool. They may occur with constipation or slower movement through the bowel.^1,2 Mention the pattern to your healthcare provider if hard stools keep returning, are difficult to pass or require regular straining.

What do Bristol stool Types 6 and 7 mean?

Types 6 and 7 describe mushy or watery stool and are associated with diarrhea.^1,4 Pay attention to how often these stools occur, how long the change lasts and whether you have other symptoms. Dehydration, blood, black stool, frequent vomiting or severe pain require medical guidance.⁴

Is Type 5 stool normal?

Type 5 is softer and less formed than Types 3 and 4. It may occur occasionally without signaling a medical problem. If it becomes your regular pattern, note any changes in frequency, urgency, discomfort, medication use or leakage and discuss ongoing concerns with a healthcare provider.

Can constipation cause bowel leakage?

Yes. Constipation can contribute to leakage when hard stool remains in the rectum and softer or watery stool passes around it.^5,6 Because leakage can have more than one cause, it should be evaluated rather than assumed to result from constipation.

Can loose stool cause accidental bowel leakage?

Yes. Loose or watery stool can fill the rectum quickly and may be harder to hold than formed stool.⁵ This can increase urgency and the chance of accidental bowel leakage. Recurring leakage may also involve the muscles or nerves used for bowel control, mobility, or other health factors.

Can the Bristol Stool Chart diagnose a digestive condition?

No. The Bristol Stool Chart describes stool form and consistency. It may help identify a pattern, but it cannot diagnose constipation, diarrhea, irritable bowel syndrome, fecal incontinence, or another health condition. A healthcare provider considers your symptoms, medical history, and examination findings.

When should I be concerned about a change in my stool?

Contact a healthcare provider if a change continues, keeps returning or occurs with new leakage, frequent urgency, ongoing pain or unexplained weight loss. Blood in the stool, black or tarry stool, severe pain, frequent vomiting, trouble keeping fluids down or signs of dehydration need more prompt guidance.^3,4

Use the Bristol Stool Chart to Describe Patterns, Not Diagnose Them

The Bristol Stool Chart gives you a clearer way to describe stool consistency. Individual variation happens, and one unusual bowel movement rarely provides the full picture.

Pay attention to patterns, other symptoms and changes from your normal bowel habits. If hard, loose or watery stool continues—or you develop urgency or accidental bowel leakage—share what you’ve noticed with a healthcare provider.

You can also learn more about accidental bowel leakage, explore how StaySure^® works or use the bowel tracking checklist above to prepare for your next appointment.

References

1. Cleveland Clinic. (2026). Bristol stool chart: Types & what they mean. In Cleveland Clinic. https://my.clevelandclinic.org/health/articles/bristol-stool-chart
2. Lewis, S. J., & Heaton, K. W. (1997). Stool form scale as a useful guide to Intestinal transit time. Scandinavian Journal of Gastroenterology, 32(9), 920–924. https://doi.org/10.3109/00365529709011203
3. National Institute of Diabetes and Digestive and Kidney Diseases. (2018). Symptoms & causes of constipation. In National Institute of Diabetes and Digestive and Kidney Diseases. https://www.niddk.nih.gov/health-information/digestive-diseases/constipation/symptoms-causes
4. National Institute of Diabetes and Digestive and Kidney Diseases. (2019). Symptoms & causes of diarrhea. In National Institute of Diabetes and Digestive and Kidney Diseases. https://www.niddk.nih.gov/health-information/digestive-diseases/diarrhea
5. National Institute of Diabetes and Digestive and Kidney Diseases. (2017). Symptoms & causes of fecal incontinence. In National Institute of Diabetes and Digestive and Kidney Diseases. https://www.niddk.nih.gov/health-information/digestive-diseases/bowel-control-problems-fecal-incontinence/symptoms-causes
6. Mayo Clinic. (2024). Fecal incontinence - symptoms and causes. In Mayo Clinic. https://www.mayoclinic.org/diseases-conditions/fecal-incontinence/symptoms-causes/syc-20351397
7. Minnesota Medical Technologies Corporation. (2025). StaySure Fecal Incontinence Insert. Minnesota Medical Technologies. https://mnmedicaltechnologies.com/wp-content/uploads/2025/12/120133-StaySure-Instructions.pdf
8. Minnesota Medical Technologies Corporation. (2026). Inserts to treat fecal incontinence. Staysuretoday.com. https://www.staysuretoday.com/