Jo Waters is an independent health writer for Daily Mail, Good Health and many consumer magazines. She is also a digital content consultant and the author of several books. Professor Julian Walters is Professor of Gastroenterology at Imperial College, London, and Hammersmith Hospital. His principal interests are the molecular and cellular function of the small intestine, especially nutrient transport and the effects of inflammatory diseases on intestinal absorption and the changes in gene expression during active disease and the repair process.

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• Introduction - what's causing your gut symptoms? Irritable bowel syndrome - causes, symptoms and treatments; Bloating and diarrhoea - could you have coeliac disease or NCGS? Watery diarrhoea - could you have bile acid diarrhoea? Bloating and bacterial overgrowth; Food allergies and sensitivities; Could FODMAPs be causing your bloating and diarrhoea? Inflammatory bowel diseases; Gallstones, hiatus hernias and diverticula disease; Cancer; Drug side effects - drugs that can cause gastric side effects; Getting to the bottom of your symptoms - a gastroeneterologist's view; Medical terms explained