In What is Disease?, renowned philosophers and medical ethicists survey and elucidate the profoundly important concepts of disease and health. Christopher Boorse begins with an extensive reexamination of his seminal definition of disease as a value-free scientific concept. In responding to all those who criticized this view, which came to be called "naturalism" or "neutralism," Boorse clarifies and updates his landmark ideas on this crucial question. Other distinguished thinkers analyze, develop, and oftentimes defend competing, nonnaturalistic theories of disease, including discussions of the relevance of these concepts to the question of "diseased" sexual orientation and to alternative medicine. What is Disease? brings concerned readers up-to-date in the debate over the proper definition of "disease," a concept of central importance not only for bioethicists, but also for those throughout clinical medicine, sociology, psychology, and law who deal with disease and its associated problems on an everyday basis.