From the wikipedia article on pseudologia fantastica:
(The links in the excerpt below were added by me.)
Pseudologia fantastica, mythomania, or pathological lying are three of several terms applied by psychiatrists to the behavior of habitual or compulsive lying. It was first described in the medical literature in 1891 by Anton Delbrueck. Although it is a controversial topic, pathological lying has been defined as "falsification entirely disproportionate to any discernible end in view, may be extensive and very complicated, and may manifest over a period of years or even a lifetime".
There are many consequences of being a pathological liar. Due to lack of trust, most pathological liars' relationships and friendships fail. If the disease continues to progress, lying could become so severe as to cause legal problems, including but not limited to fraud.
Pathological lying is a complex phenomenon, differing from other mental illnesses. It has many life-changing consequences for those who must live with the illness. Currently, there is not enough research in the area of pathological lying to guarantee a cure.
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