Narcissistic personality disorder is a mental illness, which causes the person suffering from it to exhibit behavioral traits of being selfish, boastful and completely obsessed about one’s self. Too much self-confidence coupled with complete disregard for other peoples feelings or ideas or even completely ignoring others needs are identifiable traits. However, it is imperative to understand that some people are narcissistic by choice and exhibit such behavioral traits. Having a narcissistic personality disorder on the other hand is a mental illness over which the affected person does not have much control. The latter is a medical condition while the former is a personality trait. The common symptoms exhibited by someone who is suffering from narcissistic personality disorder include: Obsessing about oneself and putting his or her needs before others, while craving attention and admiration without any regards or concern for other peoples feelings, needs or emotions is one of the glaring symptoms. Believing he or she is extra special and setting unrealistic targets and goals for oneself while fantasizing about success, money, and power beyond limits and capability. Suffering from a wide range of mood swings and not being able to ground oneself, constantly talking about his or her achievements is another indicator of someone who has this mental condition.