Oct 07, 2026

The Bristol Stool Scale

The Bristol Stool Chart: What Is Your Poo Telling You?

Most of us flush the toilet without giving our stool a second glance. However, its shape, consistency, colour and frequency can provide useful clues about how well our digestive system is functioning.

The Bristol Stool Chart, also called the Bristol Stool Scale or Bristol Stool Form Scale, divides stools into seven types. Types 1 and 2 usually suggest constipation, Types 3 and 4 are generally considered the most comfortable and well-formed, and Types 5 to 7 become progressively softer and looser.

Image recognition By Cabot Health, Bristol Stool Chart –

The chart cannot diagnose a medical condition, but it can help you notice patterns and explain your symptoms more clearly to a healthcare practitioner.

In my work, Types 1 and 2 are by far the patterns I hear about most often. Clients may also describe bloating, straining, incomplete emptying, griping or spasmodic pain, foul-smelling gas and discomfort when sitting for long periods.

After supporting people with digestive health for more than 20 years, one thing I know for certain is that it is easy to become so accustomed to discomfort that you stop noticing how much it is affecting you.

What is the Bristol Stool Chart?

The Bristol Stool Form Scale was developed by researchers at the University Department of Medicine at Bristol Royal Infirmary. Their 1997 study found that stool form was a useful way of monitoring changes in intestinal transit—the time it takes material to move through the digestive system.

The seven types are:

Type 1: Separate hard lumps

These may look like nuts, pellets or small stones and can be very difficult to pass.

Type 1 commonly indicates constipation. The stool has remained in the colon long enough for a significant amount of water to be absorbed, leaving it dry and hard.

Type 2: Sausage-shaped but lumpy

This stool has formed into one piece but remains hard, dry and uneven.

Type 2 also suggests constipation and may be accompanied by straining, discomfort or the feeling that the bowel has not emptied fully.

Type 3: Sausage-shaped with cracks

Type 3 is formed and relatively easy to pass, although the cracks suggest it may be slightly drier than Type 4.

It is generally considered within the healthy range.

Type 4: Smooth, soft and formed

This stool is smooth and soft, often described as resembling a sausage or snake. It should pass comfortably without excessive urgency or straining.

Type 4 is generally considered the ideal consistency.

Type 5: Soft blobs with clear edges

Type 5 is softer and passes easily. An occasional Type 5 stool is not necessarily diarrhoea.

If it becomes your regular pattern, however, it may suggest that the stool is moving through your bowel more quickly or that your diet contains insufficient fibre to form a more substantial stool.

Type 6: Mushy pieces with ragged edges

Type 6 is loose and poorly formed. It may be accompanied by urgency, cramping or more frequent trips to the toilet.

It can occur following a dietary change, infection, stress, medication or laxative use. A persistent change should be discussed with your GP.

Type 7: Entirely watery

Type 7 contains no solid pieces and is considered diarrhoea.

The immediate priorities are usually hydration and identifying the cause. Seek medical advice if diarrhoea is severe, persistent, accompanied by blood or associated with significant pain, fever, weakness or signs of dehydration.

Which Bristol stool type is healthiest?

Types 3 and 4 are generally considered the most desirable because they are formed, retain moisture and should pass without significant straining or urgency.

That does not mean every bowel movement must look perfect.

Your stool can change temporarily in response to:

what you have eaten;
how much fluid you have consumed;
medication or supplements;
stress;
travel;
illness;
hormonal changes;
physical activity;
meal timing;
disruption to your usual routine.

The value of the Bristol Stool Chart lies in identifying repeated patterns, rather than becoming concerned about one unusual bowel movement.

What do Types 1 and 2 feel like in everyday life?

People sometimes think constipation simply means not going to the toilet for several days. In reality, you may be constipated even if you pass some stool every day.

The HSE advises that constipation may involve:

having fewer than three bowel movements a week;
passing dry, hard or lumpy stools;
finding stools difficult to pass;
stomach ache;
bloating or nausea.

Among my own clients, Type 1 and Type 2 stools are frequently accompanied by:

straining;
incomplete emptying;
pressure in the abdomen or rectum;
griping or spasmodic discomfort;
bloating;
foul-smelling gas;
irritability;
difficulty concentrating or a feeling of brain fog;
discomfort when sitting for extended periods.

When these symptoms have developed gradually, people often accept them as normal. They may say that constipation runs in the family or that they have “always been like this.”

Common does not necessarily mean comfortable or healthy.

My own experience: I had stopped noticing my symptoms

I discovered this personally after being diagnosed with coeliac disease.

It was only after removing gluten from my diet that I realised how much it had been affecting my digestion. I had lived with the symptoms for so long that I had become accustomed to them and had stopped noticing how uncomfortable I really was.

As the symptoms began to resolve, I felt considerably better. Looking back, the difference was obvious—but it had not felt obvious while I was living with it every day.

This is one reason I encourage people to pay attention to patterns. Your stool may change in response to a particular food, eating at a different time, drinking less water, travelling, feeling stressed or changing your routine.

A simple record can help you see connections that are easily missed when each day is viewed in isolation.

How to use the Bristol Stool Chart

You do not need to analyse every bowel movement obsessively. Instead, observe what happens over a week or two.

Record:

the Bristol stool type;
how often you go;
whether you strain;
whether the bowel feels fully emptied;
bloating, gas, pain or urgency;
unusual colour, mucus or blood;
how much fluid you drank;
changes in food, medication or supplements;
movement and exercise;
stress, travel or disrupted routines.

The aim is not to achieve a Type 4 stool every single day. It is to recognise your usual pattern and notice when something has changed.

What else can the appearance of your stool indicate?

Stool appearance can offer useful information, but it should not be used to diagnose a liver, gallbladder or digestive condition by itself.

Hard pellets

Small, hard pellets are usually associated with constipation and slow movement through the bowel.

In Traditional Chinese Medicine, dry pellet-like stools may be considered within broader patterns involving dryness, stagnation or the traditional Liver system. However, these traditional patterns are not the same as a Western medical diagnosis of liver disease.

I find the traditional perspective useful as a reminder to look at the whole person—their food, fluids, stress, emotions, movement and routine—rather than treating one symptom in isolation.

Greasy, pale or difficult-to-flush stools

An occasional stool that floats or is difficult to flush is not automatically a cause for concern.

Persistently pale, greasy, oily or unusually foul-smelling stools can sometimes occur when fat is not being absorbed properly. This deserves medical assessment rather than assuming it is simply a “liver imbalance.”

The HSE recommends speaking with your GP if your stool becomes very pale or very dark.

Foul-smelling stool and gas

All stools and intestinal gas have some odour. When stool remains in the bowel for longer, bacteria have more time to act on its contents. Diet, constipation, food intolerance and changes in the gut microbiome can all affect the smell.

I prefer this explanation to saying that foul-smelling gas proves the body is “toxic.” Bacterial breakdown is a normal process, although constipation can make the results particularly unpleasant.

A sudden or persistent change in smell, especially with diarrhoea, weight loss, greasy stools, bleeding or significant pain, should be medically reviewed.

Mucus or sticky stools

The bowel naturally produces mucus to help stool pass. A small amount may occasionally be visible.

Persistent or increasing mucus—particularly when accompanied by blood, pain, diarrhoea or a lasting change in bowel habits—should be discussed with your GP.

Thin stools

An occasional narrow stool can occur because of temporary bowel spasm or the stool’s consistency.

If your stools become persistently narrower than usual, particularly alongside bleeding, pain, weight loss or a feeling of incomplete emptying, arrange a medical review.

Undigested food

Seeing pieces of fibrous vegetables in the stool can be normal because the body does not completely break down every type of plant fibre.

Eating quickly or not chewing thoroughly can make food particles more noticeable. However, persistent undigested food accompanied by diarrhoea, weight loss, greasy stools, pain or other symptoms deserves further investigation.

How fibre, fluids and movement support healthier stools

The HSE recommends increasing fibre, drinking plenty of fluids, remaining active and developing a regular toilet routine to help relieve constipation.

The European Food Safety Authority considers 25 grams of fibre per day adequate for normal bowel function in adults.

Increase fibre gradually. Adding a large amount too quickly—particularly when you are already constipated—can worsen bloating and gas.

Helpful sources include:

vegetables;
fruit;
oats;
linseed;
wholegrains;
nuts and seeds;
beans and pulses, where tolerated.

Fibre needs fluid. EFSA considers a total daily water intake of approximately two litres for women and 2.5 litres for men adequate under moderate conditions. This includes water obtained from both drinks and food, and individual requirements vary.

Regular walking or other movement can also encourage bowel activity. Do not repeatedly ignore the urge to go, and give yourself enough time to use the toilet without rushing.

Warm peppermint or ginger tea may feel soothing when you are bloated or uncomfortable. I prefer it pleasantly warm rather than very hot.

Where does Oxy-Powder fit?

When someone is already passing Type 1 or Type 2 stools, lifestyle changes may take time to have an effect. Some of my clients choose to begin with an Oxy-Powder cleanse before moving to a lower maintenance amount.

My approach usually includes:

completing a structured seven-day cleanse;
moving to an individual maintenance dose where appropriate;
increasing fluids;
introducing more movement;
gradually increasing fibre;
paying attention to food, stress and daily routine.

Oxy-Powder softens and loosens the stool, so your bowel movements may become very loose or watery during a cleanse. They will often remain softer while using a maintenance amount.

For this reason, someone taking Oxy-Powder should not judge progress solely by whether every stool is Type 3 or Type 4.

I also look for:

less straining;
more regular bowel movements;
reduced pressure and bloating;
less trapped or foul-smelling gas;
a greater sense of complete emptying;
improved comfort when sitting and moving;
needing fewer capsules over time;
better concentration and less irritability;
the beginning of a dependable daily routine.

If you are considering it, read my step-by-step Oxy-Powder instructions before you begin.

You can also purchase Oxy-Powder from The Wellbeing Clinic.

When should you speak to your GP?

The Bristol Stool Chart is an observation tool, not a substitute for medical assessment.

The Irish Cancer Society advises having an unexplained change in your bowel habits checked if it lasts longer than three weeks.

Speak with your GP if you notice:

blood in your stool or bleeding when passing stool;
black or very dark stool;
persistently pale or greasy stool;
constipation, diarrhoea or alternating between the two without an obvious explanation;
a continuing feeling that the bowel has not emptied;
a persistent change in how often you go;
ongoing abdominal or rectal pain;
severe or worsening griping pains;
persistent bloating;
nausea when eating, reduced appetite or feeling full unusually quickly;
unexplained weight loss;
unusual tiredness;
vomiting;
a hard or increasingly swollen abdomen;
inability to pass either stool or gas.

These symptoms can have many causes and do not automatically mean cancer. They should still be checked rather than attributed to food, stress or constipation without assessment.

If you are eligible for Ireland’s BowelScreen programme, continue to participate when invited. Screening is intended for people without symptoms. If you have symptoms, contact your GP even if a previous screening result was normal.

Frequently asked questions

How often should you have a bowel movement?

There is no single frequency that is right for everyone. What matters is whether your pattern is normal for you and whether you can pass stool comfortably without excessive straining, pain or urgency.

The HSE says it may be constipation if you have fewer than three bowel movements in a week or if your stool is regularly dry, hard, lumpy or difficult to pass.

Is Type 5 stool diarrhoea?

Not necessarily. Type 5 is soft and formed into separate blobs. An occasional Type 5 stool may be normal.

Types 6 and 7 are more consistent with diarrhoea, especially when accompanied by increased frequency or urgency.

Can constipation cause loose stool?

Yes. Long-term constipation can sometimes lead to faecal impaction. Watery stool may then leak around the hardened stool, creating what is known as overflow diarrhoea.

Seek medical advice rather than repeatedly taking products for diarrhoea if you suspect that constipation may be underneath it.

Can Oxy-Powder change your Bristol stool type?

Yes. Oxy-Powder is intended to loosen the stool, so it can move your bowel movements towards the softer end of the scale.

During a cleanse, loose or watery stools are expected. Your dose may need adjustment if bowel movements become excessive or you develop weakness, dizziness, dehydration or symptoms that concern you.

Should floating stool worry me?

A stool can occasionally float because it contains more gas. Floating alone does not diagnose a problem.

Seek medical advice if stools are persistently greasy, oily, unusually pale, difficult to flush or accompanied by weight loss, pain or other ongoing digestive symptoms.

Start by paying attention

Your stool is not something to feel embarrassed about. It is one of the practical ways your body communicates with you.

Use the Bristol Stool Chart to notice patterns. Observe how your digestion responds to changes in food, hydration, movement, stress, meal timing and routine. If you use Oxy-Powder, compare how you feel before the cleanse, during it and after moving to maintenance.

Most importantly, do not accept persistent discomfort as normal simply because you have lived with it for a long time.

If you have questions or would like individual support, you can book a Digestive Wellbeing Review with me. We can look at your stool pattern, symptoms, diet and daily routine and identify practical next steps.

A Digestive Wellbeing Review does not replace medical diagnosis or treatment. If you have bleeding, significant pain, unexplained weight loss, vomiting, persistent appetite changes or any other concerning symptoms, please speak with your GP.

Sources and further reading

This article provides general information only and does not replace individual advice from your GP, pharmacist or another appropriately qualified healthcare professional.