Narcissism is not just another trait of the selfish person. It is also a serious mental disorder, often followed by the adverse consequences when not taken seriously. There are several known personality disorders, but this one stands out from the rest by turning the individual into the selfish and boastful person who denies to see personal weaknesses. Some may say that it is better than having mental disorders associated with the hatred to oneself and regular depressions associated with the shy and gloomy nature of the patient.