The cause of this disorder is unknown, but one theory proposes that the parents of people who develop this disorder needed their children to be talented or special in order to maintain their own self-esteem. This disorder usually begins by early adulthood.
Narcissistic people are unable to perceive themselves and others accurately.
They often feel entitled to special treatment by others and can become demanding, angry, and easily offended. A psychological evaluation may be performed. The outcome varies with the severity of the disorder. Calling Your Health Care Provider Call for an appointment with your health care provider or mental health professional if symptoms of narcissistic personality disorder are interfering with your relationships with others, or if alcohol use or drug abuse develop. Prevention Because the exact cause is unknown, prevention is also unknown.