Can a hammer fix a cold? Can a screwdriver drive away an itchy spot? What's the difference between a virus and an allergy or a pimple and a wart? Fred Ehrlich explains all about ills, chills, what makes us snivel and feel sore; and how doctors, treatments, and processes inside us can handle our bodies' ick-ness and sickness. But, you can't find any of these fixer-uppers - in a toolbox!