Bristol stool chart: what types 1 to 7 mean
The short answer
The Bristol stool chart sorts stool into seven types by shape and texture. Types 1 and 2 are hard and point to constipation, types 3 and 4 are the normal range, and types 5 to 7 are increasingly loose, with type 7 being diarrhea. A single odd day rarely matters; a change that lasts is what's worth tracking.
The Bristol stool chart (also called the Bristol stool scale or Bristol stool form scale) is a seven-point scale that describes poop by its shape and texture. Ken Heaton and Stephen Lewis at the Bristol Royal Infirmary published it in 1997 as a way to estimate how long food takes to pass through the gut, and it’s now the standard way doctors and nurses talk about stool.
The longer stool stays in the colon, the more water the body pulls out of it, so it gets harder and lumpier. When it moves through fast, there isn’t time to absorb the water, so it comes out soft or liquid. Shape is a stand-in for transit time.
The 7 Bristol stool types
| Type | What it looks like | What it usually means |
|---|---|---|
| 1 | Separate hard lumps, like nuts. Hard to pass. | Constipation. Stool has been in the colon a long time. |
| 2 | Sausage-shaped but lumpy. | Mild constipation. |
| 3 | Like a sausage with cracks on the surface. | Normal. |
| 4 | Like a sausage or snake, smooth and soft. | Normal, and the type most people aim for. |
| 5 | Soft blobs with clear-cut edges, passed easily. | The loose end of normal. Can mean a low-fiber meal. |
| 6 | Fluffy, mushy pieces with ragged edges. | Mild diarrhea. |
| 7 | Watery, no solid pieces. | Diarrhea. |
Which types are normal?
Types 3 and 4 are the normal range. Type 4 is often called the ideal: easy to pass, no straining, no urgency.
You won’t hit type 4 every time, and you don’t need to. Food, fluids, sleep, stress, travel, exercise and your menstrual cycle all nudge stool form from day to day. A type 2 after a long flight or a type 5 after a big curry is ordinary. What tells you something is a pattern: most of your stools sitting at one end of the scale for a couple of weeks or more, or a clear change from what’s normal for you.
Types 1 and 2: the constipated end
Hard, lumpy stools usually mean slow transit. Common causes are not enough fiber or fluid, sitting still for long stretches, ignoring the urge to go, and some medications, including iron supplements and opioid painkillers. The usual first steps are more water, more fiber from fruit, vegetables, beans and whole grains, and regular movement. If that doesn’t help within a few weeks, or going is painful, talk to a doctor or pharmacist.
Types 5 to 7: the loose end
Loose stools mean things are moving fast. A single episode is often food, alcohol, caffeine, stress or a stomach bug. Type 7 that lasts more than a couple of days, or that comes with blood, fever, severe pain or signs of dehydration, needs medical advice. Dehydration is the main short-term risk, so keep drinking.
How doctors use the chart for IBS
Irritable bowel syndrome is often split into subtypes based on stool form on the days you have abnormal bowel movements:
- IBS with constipation (IBS-C): mostly types 1 and 2.
- IBS with diarrhea (IBS-D): mostly types 6 and 7.
- Mixed IBS (IBS-M): a real share of both.
This is why a GI doctor may ask you to log your stool type for a few weeks before an appointment. A record beats memory, which tends to remember the worst days.
When to see a doctor
The chart helps you describe what’s happening. It doesn’t diagnose anything. Contact a doctor if you notice:
- blood in your stool, or black, tar-like stool
- a change in your usual bowel habit that doesn’t settle, such as looser stools or constipation that’s new for you
- unexplained weight loss or constant tiredness
- severe or ongoing belly pain, or a lump in your tummy
- diarrhea with fever, or diarrhea that lasts more than a couple of days
Get urgent care for a lot of blood, black tarry stool with dizziness or fainting, or severe belly pain.
How to track your Bristol type
Note the type right after you go, not at the end of the day. Write down the time, too. After two weeks you’ll have enough entries to see your own normal: how often you go, which types come up most, and whether bad days cluster after certain meals.
Paper works. So does a notes app. Poopwell was made for this: the log screen is the seven types in a list, you tap one, and it saves. The calendar then colors each day by type, which makes runs of hard or loose days easy to spot, and the PDF report gives your doctor the type distribution and a dated log.
Questions people also ask
What is a normal Bristol stool type?
Types 3 and 4 are considered normal. Type 4, smooth and soft like a sausage, is the one most people aim for. Most people have a type 2 or a type 5 now and then without anything being wrong.
Is Bristol type 5 normal?
Type 5 sits at the loose edge of normal. Now and then it's common, especially after a low-fiber meal. If most of your stools are type 5 or looser for weeks, it's worth mentioning to a doctor.
Is type 6 on the Bristol stool chart diarrhea?
Type 6 is mushy with ragged edges and points toward mild diarrhea. Type 7, which is fully liquid, is diarrhea.
What do Bristol types 1 and 2 mean?
Both are signs of constipation. Stool has stayed in the colon long enough to lose most of its water. More fluids, more fiber and regular activity usually help, but see a doctor if it persists or hurts.
Sources
This guide is general information, not medical advice. If you're worried about a change in your bowel habits, talk to a doctor. Get urgent help for heavy bleeding, black tarry stool with dizziness, or severe belly pain.
