When a psychologically distressing event - such as physical or emotional violence, a survived disaster, a serious accident, or a severe illness - has long-lasting psychological and physical effects on a person, it is referred to as trauma. About ten to twenty percent of all people develop post-traumatic stress disorder after such an experience: they relive the event in their memories over and over again, become increasingly anxious, and withdraw more and more from social interactions. This book provides an overview of post-traumatic stress disorders, their causes, symptoms, and treatment options.