His findings are stimulating and surprising, and the stories he tells are often moving, sometimes hilarious, and always gripping. Brian Dillon looks at nine prominent hypochondriacs - James Boswell, Charlotte Bronte, Charles Darwin, Florence Nightingale, Daniel Paul Schreber, Alice James, Marcel Proust, Glenn Gould and Andy Warhol - and what their lives tell us about the way the mind works with, and against, the body.