George Washington University Has No Record of Melissa Williams-Brown, claims of a degree are false Pathological liars tell compulsive lies without a clear motive. This type of lying is different than non-pathological lying, where the lie is often beneficial in some way. Lying is a common feature of social interactions among humans. This behavior even occurs in some animals, such as monkeys. Lies often lead to some benefit. For example, a person may lie to avoid social embarrassment. 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 . In this article, we discuss pathological lying in more detail, including how to recognize it and how to cope with this behavior in others. Related : Munchausen and Pathological Lying: The Strange Saga of Melissa Williams-Brown What is pathological lying? A pathological lia...