What mental illness causes lying?
Some pathological lying may result from a mental condition, such as antisocial personality disorder (sometimes called sociopathy), while others appear to have no medical reason for the behavior.
Does a liar get defensive?
9. They tend to point a lot. "When a liar becomes hostile or defensive, he is attempting to turn the tables on you," says Glass. The liar will get hostile because he is angry that you've discovered his lies, which may result in a lot of pointing.
Why do liars get angry when confronted?
Pathological liars get extremely angry when confronted with proof of their falsehoods. They often balk at innocent questions about their fabrications. Many pathological liars believe their lies and find it more comfortable to lie than tell the truth. When questioned or confronted, they revert to anger and hostility.