<P> Some psychiatrists distinguish compulsive from pathological lying, while others consider them equivalent; yet others deny the existence of compulsive lying altogether; this remains an area of considerable controversy . </P> <P> Diagnosing pathological lying can be difficult . Psychologists are trained to understand the issues this diagnosis presents as a disorder . It is listed in the Diagnostic and Statistical Manual of Mental Disorders, third edition . It is a stand - alone disorder as well as a symptom of other disorders such as psychopathy and antisocial, narcissistic, and histrionic personality disorders, but people who are pathological liars may not possess characteristics of the other disorders . </P> <P> It has been shown through lie detector tests that PF (pseudologia fantastica) patients exhibit arousal, stress, and guilt from their deception . This is different from psychopaths, who experience none of those reactions . People affected by antisocial disorder lie for external personal profit in the forms of money, sex, and power . PF is strictly internal . The difference between borderline personality disorder and PF is that BPD patients desperately try to cope with their feeling of abandonment, mistreatment, or rejection by making empty threats of suicide or false accusations of abandonment . Pathological liars do not feel rejected; they have high levels of self - assurance that help them lie successfully . Unlike those with histrionic personality, pathological liars are more verbally dramatic than sexually flamboyant . Narcissists think they have achieved perfection and are unempathetic to others . PF patients do not show these anti-social behaviors; they often lie because they think their life is not interesting enough . The only diagnosis in our current system where purposeless, internally motivated deception is listed is axis I factitious disorder . This diagnosis deals with people who lie about having physical or psychological disorders . People with PF tend to lie about their identities and past history . Since the symptoms do not match up, the individual may go undiagnosed . Though they could well be diagnosed under the catch - all rubric of unspecified personality disorder (ICD - 10 code F69) or perhaps even better under ICD - 10 code F68. 8 "Other specified disorder of adult personality and behaviour" as this defines itself as "This category should be used for coding any specified disorder of adult personality and behaviour that cannot be classified under any one of the preceding headings". Here the specified disorder is the lying for psychological reasons (not material ones e.g. money etc .) and the behavior would also need to meet the necessary conditions to be viewed as a psychiatric illness . </P> <P> Pathological lying is in Factor 1 of the Psychopathy Checklist (PCL). </P>

What do you call a person who lies all the time