Compulsive behavior

Compulsive behavior is behavior which a person does "compulsively", i.e., not because he enjoys it but because he feels he "has to". The two most common forms are:
 * 1) obsessive-compulsive disorder - obsessive, distressing, intrusive thoughts and related compulsions which attempt to neutralize the obsessions
 * 2) drug addiction - a condition where a person takes a drug compulsively, despite potential harm to themselves, or their desire to stop