If someone has narcissistic traits, does that mean they have narcissistic personality disorder?

On this episode of the Help! I Have a Narcissist in my Life Podcast, Laurel Slade-Waggoner answers a question that she has been asked several times when she is on call-in radio programs. The question is this: 

"If someone has narcissistic traits, does that mean they have narcissistic personality disorder?"

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