Compulsive liars!

What is it that makes some of us lie even when there is no need to?

I read somewhere that compulsive lying is a situation where a person keeps on lying with no reason or motivation.

Seems strange...but I am sure many of us have come across such people...

Some of them can be our own friends and acquaintances..who otherwise are normal and nice people....but can amaze, amuse and sometimes annoy you with this habit of theirs.

I am sure all of us lie or have lied many times in life...

I myself have utilized this negative trait mostly because of one of the following reasons:

- To save myself from embarrassment/threat/anger
- To save someone else from embarrassment/threat/anger
- To hide some facts that I didn't want disclosed
- To control the situation from getting out of hand

But when I come across people who lie easily because of no rhyme or reason...I am really surprised...why should you lie when there is no need to...especially when you know there is a strong chance that your lie will be found out???
Don't they think ...that their lies regarding an insignificant issue ...especially when something can be verified .... can actually belittle them in others eyes...and make others doubt their credibility?

Maybe it is really a disorder...and the person in question...needs help...