Psychiatry's diagnostic guidebook gets its first major update in 30 years. This ideological shift signals a step away from the simplistic notion that mental illnesses are discrete conditions wholly distinct from a healthy state of mind. Instead the new volume reflects the idea that everyone falls on a spectrum that stretches from typical behavior to various shades of dysfunction. Where you land on that scale determines whether your symptoms merit treatment. This approach might assist, for example, psychiatrists evaluating a patient’s attention problems, which can seem almost ubiquitous in younger children.