Irritable bowel syndrome (IBS) describes a collection of symptoms, commonly including chronic abdominal pain, bloating, flatulence and altered bowel habits. It is a functional disorder of the intestines, occurring in the absence of visible structural abnormality.
IBS affects up to 22% of people in the UK (Maxwell 1997) and is the most common functional digestive disorder seen by GPs. Women are 2-3 times more likely to develop IBS, and often suffer more symptoms during their periods. The condition often begins in adolescence or early adulthood.