The exact cause of narcissistic personality disorder is not known. However, many mental health professionals believe it results from a combination of factors that may include biological vulnerabilities, social interactions with early caregivers, and psychological factors that involve temperament and the ability to manage stresses. Some researchers believe that narcissistic personality disorder may be more likely to develop when children experience parenting styles that are excessively pampering, or when parents have a need for their children to be talented or special in order to maintain their own self-esteem. On the other end of the spectrum, narcissistic personality disorder might develop as the result of neglect or abuse and trauma inflicted by parents or other authority figures during childhood. The disorder usually is evident by adolescence or early adulthood when personality traits have become consolidated.
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