Book excerpt: Depersonalization Disorder is when a person experiences a feeling of being detached from life around them and sometimes emotionally numb. It is often a symptom of another disorder such as anxiety, depression, posttraumatic stress disorder and particularly panic disorder, or of an illness like epilepsy or migraine, but also occurs in its own right and among users of certain drugs. CBT is an effective treatment. PRAISE FOR THE SERIES: 'The best consumer-friendly CBT-based books&All are very thorough.' Observer 'The Overcoming series just keeps getting better and better.' The Psychologist