There is a type of extreme lying that does indeed appear to have a strong genetic component. Officially known as "pseudologia fantastica," this condition is characterized by a chronic tendency to spin out outrageous lies, even when no clear benefit to the lying is apparent.

Is pathological lying a mental disorder?

While some people lie more frequently than others, it is not typically a sign of a mental health condition. Pathological lying is different. It may be a sign of an underlying mental health condition, such as a personality disorder.

What mental illness causes pathological lying?

Pathological lying is a symptom of various personality disorders, including antisocial, narcissistic, and histrionic personality disorders. Other conditions, such as borderline personality disorder, may also lead to frequent lies, but the lies themselves are not considered pathological.