Narcissistic personality disorder is rare. During childhood and teen years, children may show traits of narcissism, but this may simply be typical of their age and doesn't mean they'll go on to develop narcissistic personality disorder.

Narcissistic personality disorder affects more males than females, and it often begins in the teens or early adulthood.

Although the cause of narcissistic personality disorder isn't known, some researchers think that in biologically vulnerable children, parenting styles that overemphasize the child's specialness and criticize fears and failures may be partially responsible. The child may hide low self-esteem by developing a superficial sense of perfection and behavior that shows a need for constant admiration.

Nov. 18, 2014

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