Pathological lying is when a person compulsively lies without a clear motive for doing so. The lies may become elaborate and detailed, but they are often easy to verify. Pathological lies do not lead to any lasting benefit for the person who tells them, and they can be harmful to others.

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.

Does a pathological liar believe their own lies?

A pathological liar tells lies and stories that fall somewhere between conscious lying and delusion. They sometimes believe their own lies.