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Narcissistic Personality Diso... : Causes

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Causes could include:
The cause of this disorder is unknown. Narcissistic personality disorder usually begins by early adulthood.
Source:ADAM
Date:October 17, 2008
At present there are two major theories about the origin and nature of NPD. One theory regards NPD as a form of arrested psychological development while the other regards it as a young child's defense against psychological pain.
Source:Gale Encyclopedia of Mental Disorders
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