Diagnosis of Munchausen is difficult, as people with the mental condition are adept at faking illness. Get the facts now. \rbr\rbrWhat is factitious disorder? Factitious disorder is a condition where someone acts as if they have an illness in order to experience the sick role. Subscribe .\rbr\rbrFind out how doctors diagnose addiction, and learn more about what you can do if you, or someone you know, is struggling with addiction.\rbr\rbrWe all engage in deception occasionally, but a pathological liar enjoys compulsive lying for no apparent personal gain. Watch this.