Irritable Bowel Syndrome (IBS) affects 10 to 20 percent of the population, making it the most common gastrointestinal syndrome. But treatment remains difficult and misperceptions that it is psychosomatic disorder remain. Learn what modern science has unearthed about this syndrome as Pankaj Parischa, M.D. and professor at the Stanford University Medical Center, leads this engaging discussion about more rational forms of therapies and IBS research. From the Series:The Stanford University Medical Center Health Hour