Bristol Stool Scale

The medically recognized classification system used by gastroenterologists worldwide — now automated by AI.

The 7 Types

Separate hard lumps

Like nuts, difficult to pass

Severe constipation

Lumpy sausage-shaped

Sausage-like but lumpy surface

Mild constipation

Sausage with cracks

Like a sausage with surface cracks

Normal

Smooth and snake-like

Smooth, soft, sausage or snake-like

Ideal

Soft blobs

Clear-cut edges, passes easily

Slightly loose

Mushy pieces

Fluffy with ragged edges

Mild diarrhea

Entirely liquid

Watery, no solid pieces

Severe diarrhea

Types 3 and 4 are considered ideal. They indicate optimal transit time and healthy water absorption in the colon.

Automatic AI Classification

You don't need to memorize the chart. PoopCheck's AI analyzes your photo and instantly classifies it on the Bristol Scale. The classification is consistent, objective, and tracked over time — giving you a clear picture of your digestive patterns.

Why It Matters

The Bristol Scale isn't just academic — it's the tool gastroenterologists use to diagnose IBS subtypes, assess treatment effectiveness, and monitor digestive disorders. By tracking your Bristol types consistently, you're building the same data your doctor would want to see.

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