This is an introduction to the Gut tutorial “Chronic diarrhoea” hosted on BMJ Learning—the best available learning website for medical professionals from the BMJ Group.

Diarrhoea predominant irritable bowel syndrome is by far the most common cause of abdominal pain and diarrhoea in patients aged 20 to 40 years. Irritable bowel syndrome as a whole affects around 10% of the UK population. The female to male ratio is 1.5:1. Between …