Woman in a black and white striped singlet stands in front of a teal background holding an image of an inflamed intestine.

Dr Sarah Holper explains the science behind dreaded diarrhoea.

Diarrhoea; it’s hard to spell and equally hard to endure.

Bristol, in England’s south-west corner, is known for its suspension bridge and ‘irrepressible creative spirit’, according to its gushing tourism website. But in medical circles, the city is also known for its stool chart.

When I was an intern working on a gastroenterology ward, the Bristol Stool Chart, a seven-point scale to describe the consistency of human faeces, was provided to me as a laminated card. Type 1 is ‘separate hard lumps’; type. . .

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