Bristol stool chart explained

Published 13 March 2026 ·Last reviewed 13 March 2026 by the editorial team ·How we create our content

At a glance

The Bristol stool chart is a simple, widely used tool that classifies stool into seven types based on form and consistency. Developed at the University of Bristol, it provides a common language for describing bowel movements — useful for self-monitoring, communicating with clinicians, and tracking the effects of dietary or lifestyle changes.

This guide explains each type, what it may indicate about bowel function, and how to use the chart practically.

The seven types

Type 1: separate hard lumps

Small, hard, separate lumps that are difficult to pass. Often described as resembling nuts or rabbit droppings.

Indicates significant constipation
The stool has been in the colon for an extended period
Requires significant straining to pass
Common triggers: dehydration, low fibre, certain medications, reduced activity

Type 2: lumpy sausage

A sausage-shaped stool that is lumpy and hard. Formed but difficult to pass.

Indicates constipation
Less extreme than type 1 but still harder than ideal
May cause discomfort or straining during passage
Often responds to increased fibre and water

Type 3: sausage with cracks

A sausage shape with cracks on the surface. Formed and relatively easy to pass.

Considered within the normal, healthy range
Indicates adequate hydration and fibre
Passes without significant straining
One of the two “target” types for bowel health

Type 4: smooth soft sausage

A smooth, soft sausage or snake shape. Easy to pass.

The most commonly cited “ideal” stool type
Indicates good transit time, hydration, and fibre intake
Passes comfortably without straining
The primary target for most bowel management approaches

Type 5: soft blobs with clear edges

Soft pieces with clearly defined edges. Easy to pass — perhaps too easy.

May indicate slightly fast transit or mild dietary sensitivity
Not necessarily a problem if it is your usual pattern
Can represent the transition between formed and loose stools
Some people with this type also describe urgency

Type 6: mushy with ragged edges

Fluffy or mushy pieces with ragged, irregular edges.

Indicates fast transit — stool moving through the colon quickly
May be associated with urgency
Common with IBS-D, dietary triggers, stress, or infection
Persistent type 6 stools are worth discussing with a clinician

Type 7: entirely liquid

Watery stool with no solid pieces. Diarrhoea.

Indicates very rapid transit
May be caused by infection, food poisoning, medication, or chronic conditions
Carries a risk of dehydration if persistent
A single episode is common and usually resolves; persistent liquid stool needs assessment

How to use the chart

For daily monitoring

A simple daily note — the number (1 to 7) — provides a clear record of bowel function over time. This is useful for:

Tracking the effect of dietary changes
Monitoring recovery from surgery (where stool management is critical)
Identifying patterns — certain foods, stress, or activities associated with changes
Preparing for medical appointments — having data rather than vague descriptions

For communicating with clinicians

The Bristol chart gives you a shared vocabulary with your doctor or specialist:

“I’ve been having mostly type 2 stools for the past three weeks” is more precise and useful than “I’m a bit constipated”
The numbers allow objective comparison over time
Clinicians use this information to guide treatment decisions

For managing colorectal conditions

For people with conditions like fissures, hemorrhoids, or post-surgical recovery:

The target is typically type 3 or 4 — soft enough to pass without trauma, formed enough to not cause irritation from frequency
Tracking stool type alongside symptoms helps identify the consistency that works best for each individual
Adjusting fibre and water intake based on stool type is more precise than guessing

What changes your stool type

Moving toward types 3-4 (from constipation)

Increasing fibre intake gradually
Drinking more water
Regular physical activity
Responding to the urge promptly
Stool softeners if needed

Moving toward types 3-4 (from diarrhoea)

Soluble fibre (which absorbs water and adds bulk)
Identifying and reducing dietary triggers
Managing underlying conditions (IBS, food intolerance)
Adequate hydration to replace lost fluids

When stool changes warrant attention

A single unusual bowel movement is rarely significant. Patterns that deserve clinical attention include:

A persistent change in your usual pattern lasting more than three weeks
Consistently hard stools (types 1-2) despite adequate fibre and water
Consistently loose stools (types 6-7) without an identifiable dietary cause
Alternating between extremes (type 1 and type 7) — common in IBS
Blood, mucus, or unusual colour
Changes accompanied by other symptoms — pain, weight loss, fever

Common questions

What is the ideal stool type on the Bristol stool chart?

Types 3 and 4 are generally considered the ideal stool forms — well-formed, easy to pass, and indicating healthy bowel function and transit time. Type 3 is a sausage shape with cracks on the surface. Type 4 is a smooth, soft sausage or snake. These types typically pass comfortably without straining.

What does it mean if my stool is always type 1 or 2?

Types 1 and 2 suggest constipation — the stool has been in the colon for a longer period, allowing more water to be absorbed. This results in hard, difficult-to-pass stools. Increasing fibre, water intake, and physical activity are common first steps. If constipation persists despite these measures, discussing it with your GP is worthwhile.

What does it mean if my stool is always type 6 or 7?

Types 6 and 7 suggest diarrhoea — the stool has moved through the colon too quickly for adequate water absorption. Occasional loose stools are common and usually not concerning. Persistent loose stools may indicate IBS, food intolerance, infection, or other conditions worth discussing with a clinician.

How often should I have a bowel movement?

Normal frequency ranges from three times per day to three times per week. The consistency and ease of passing are more important indicators of bowel health than frequency alone. A significant change in your usual pattern is more noteworthy than where you fall on the frequency range.

Should I track my stool type?

Tracking can be helpful if you are managing a bowel condition, recovering from surgery, trying to identify dietary triggers, or preparing information for a medical appointment. A simple daily note of stool type (using the Bristol chart numbers) alongside what you ate and how you felt provides useful data. It does not need to be a permanent habit — a few weeks of data is often enough to identify patterns.

When to seek care Heavy bleeding or feeling faint? Get emergency help now. Emergency: 911

Not sure how urgent it is? Get help today.

Emergency
Heavy bleeding, black tarry stools, feeling faint, severe pain or trouble breathing.

Call 911 or go to the ER.
Today
Fever, pain getting worse, a hot swollen lump, or trouble passing urine.

Call your doctor or go to urgent care.
Soon
Bleeding or bowel changes nobody has checked, or anything lasting 3 weeks.

Book a doctor’s appointment.

Feeling overwhelmed? Call or text 988, any time.

See all the signs

For this topic, get medical advice if you notice:

Blood in or on the stool
Black or tarry stool
Persistent change in bowel habit lasting more than three weeks
Stool that is very narrow or ribbon-like consistently
Mucus in the stool with other symptoms

Recording how you feel is not the same as being checked. These are the signs that need a doctor’s attention.

Call 911 or go to the emergency room now if you have:

bleeding that will not stop, a lot of blood (the toilet water turns red, or you pass large clots), or any bleeding with feeling faint or dizzy
fainting, a racing heart or trouble breathing
confusion or slurred speech, extreme shivering, no urine in a day, or blotchy skin
sudden severe belly pain, or a swollen, hard belly with vomiting or not passing stool or gas
you cannot pass urine at all, or your bladder feels full and painful and you can’t empty it
redness, swelling or severe pain spreading quickly around your anus, genitals or groin, especially with a fever or feeling very ill
a fever with a painful swelling near your anus if you have diabetes or a weakened immune system (for example, from chemotherapy or transplant medicines)
black, tarry stools

Call your doctor or go to urgent care today (or the ER if you can’t be seen today) if you have:

a temperature of 100.4°F (38°C) or higher, chills, vomiting, or feeling generally unwell
pain that is getting worse over days, or severe pain that stops you sitting or sleeping
a hot, swollen or very tender lump near your anus or at the top of the crease between your buttocks, or foul-smelling discharge
trouble urinating
bleeding that is getting heavier or more frequent, or blood mixed into your stool
feeling much more tired than usual, looking pale, or getting out of breath more easily than you used to
not passing stool for several days, or new belly pain

Make an appointment with your doctor if:

you have never had these symptoms checked by a doctor or nurse — whatever your age
you have had rectal bleeding for more than 3 weeks
your bowel movements have been looser, thinner or more frequent than usual for 3 weeks or more, or you have lost weight without trying
symptoms have not settled after a week or so, or keep coming back
you notice a new lump near your anus, between your buttocks or in your belly, or an itch or discharge that does not clear
you have new leakage or trouble controlling your bowels
you are 45 or over, or have a family history of bowel cancer or inflammatory bowel disease, and any of these symptoms are new for you

If you are unsure, it is always reasonable to ask. If things feel overwhelming, call or text 988 (Suicide & Crisis Lifeline) or chat at 988lifeline.org, any time. If you don’t feel safe, call 911.

Showing US care routes. Change region at the foot of the page.

Discreet symptom tracking

Symptoms that come and go? Keep track, day by day.

For hemorrhoids, fissures, fistulas and other anal and rectal problems. A short, discreet email asks how things have been, and saves each answer, so you can look back at every flare and every good week in your own words. If you haven’t had your symptoms checked, see your doctor first.

About ten seconds a check-in. No app, no password.
Nothing in the subject or preview says what it’s about.
Each Sunday, a link to your week, ready for your next appointment.

Start tracking →

Your notes

Your check-in

Takes about ten seconds.

20:00

Example. Nothing on the lock screen hints at symptoms or conditions.

Explore more

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