Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Narcissistic personality disorder is a condition characterized by an exaggerated sense of self-importance, need for admiration and lack of empathy for others. However, the condition is diagnosed only if the inflated self-centeredness becomes disabling and distressing according to researchers, affected individuals are subjected to high levels of stress since the disorder is linked to vulnerability in self-esteem. Learn more about the personality disorder, its causes, symptoms and treatments in this book.