Here’s an interview with H. Gilbert Welch, M.D., a professor of medicine at the Dartmouth Institute for Health Policy and Clinical Practice and Dartmouth’s Geisel School of Medicine, in which he talks about  problems created by medicine’s efforts to detect disease early. His books include  Overdiagnosed: Making People Sick in Pursuit of Healthand, most recently, Less Medicine, More Health: 7 Assumptions That Drive Too Much Medical Care.