You might be dealing with a compulsive liar or a pathological liar — and yes, there is a difference.
A compulsive liar is someone who lies… well, with compulsion. They have little, if any, control over it. Their lying is constant and habitual, and they seemingly tell lies for no reason at all. On the other hand, pathological liars do so with some sort of intent. They lie to get what they want through manipulation.
So, how can you tell if you’re dealing with one of these people? There are some tell-tale signs to help you spot them, and with a little effort it’s fairly easy to see a pattern of lying and deceit — be it of the pathological sort, or compulsive.