A riveting exploration of the most difficult and important part of what doctors do, by Yale School of Medicine physician Dr. Lisa Sanders, author of the monthly New York Times Magazine column "Diagnosis," the inspiration for the hit Fox TV series House, M.D.

"The experience of being ill can be like waking up in a foreign country. Life, as you formerly knew it, is on hold while you travel through this other world as unknown as it is unexpected. When I see patients in the hospital or in my office who are suddenly, surprisingly ill, what they really want to know is, 'What is...