Although our understanding of diseases and disorders has evolved over time, there are still many incorrect assumptions made about people who suffer from certain ailments. People with obsessive-compulsive disorder are not people who simply like to arrange things by color. People with chronic pain have a debilitating illness, even though they do not appear to be sick. These and other assumptions are debunked as readers discover the truth about diseases and disorders ranging from breast cancer to epilepsy. Essential facts are presented through accessible main text and sidebars, as well as detailed charts and graphs.