Separate hard lumps · Hard to pass (severe constipation)
Type 2
Lumpy and sausage-like · Mild constipation
Type 3
Sausage with cracks on surface · Normal
Type 4
Smooth, soft sausage or snake · Normal (ideal)
Type 5
Soft blobs with clear edges · Lacking fiber
Type 6
Mushy consistency with ragged edges · Mild diarrhea
Type 7
Liquid, no solid pieces · Severe diarrhea
About the Bristol Stool Chart
The Bristol Stool Chart is a medical tool designed to classify stool into seven categories based on shape and consistency. Types 3 and 4 are considered normal and healthy, with Type 4 (smooth and soft) often described as ideal; they pass easily without straining or urgency. Hard, lumpy stools (types 1–2) suggest constipation, while mushy or liquid stools (types 6–7) suggest diarrhea. The chart helps healthcare providers and patients communicate about digestive health. Stool form can change with diet, hydration, stress, and illness, so an occasional off day is normal. Persistent changes, or warning signs such as blood in the stool, black or tarry stools, unexplained weight loss, or a sudden ongoing change in bowel habits, should be discussed promptly with a doctor. This information is for general reference and is not medical advice.
Frequently Asked Questions
Q: Which stool types are healthiest?
A: Types 3 and 4 are considered normal and healthy, with Type 4 (smooth and soft) often described as ideal. They pass easily without straining or urgency.
Q: What do types 1 and 2 mean?
A: Hard, lumpy stools (types 1–2) suggest constipation, often linked to too little fiber or fluid. Increasing water and fiber can help; persistent constipation is worth discussing with a doctor.
Q: When should loose stools be a concern?
A: Occasional types 6–7 are common with illness or diet changes. See a doctor if diarrhea lasts more than a few days, causes dehydration, or is accompanied by blood, fever, or severe pain.
SourceBristol Stool Scale (Heaton & Lewis, University of Bristol, 1997)