What is Compulsive Lying Disorder? Compulsive lying disorder, also known as pseudologia fantastica or mythomania, is a condition that describes the behavior of a habitual liar. ​While compulsive lying disorder is actually not included in the Diagnostic and Statistical Manual of Mental Disorders (DSM-IV), except as a symptom of factitious disorder, many psychiatrists and psychologists consider it a distinct mental disorder. In the past two decades countless hours of research and multiple papers have been written regarding this issue, though it remains one of the most under researched psychiatric conditions. Individuals with the disorder simply cannot stop themselves from misrepresenting...