Are narcissists created or born and can they be treated?

What does the DSM-5 say about narcissists? How does narcissism develop in certain individuals? Are there genetic links? What potential treatments for NPD are available? Are narcissists really as happy and confident as they show themselves to be? Are narcissists born or made?
Learn insights from recent research papers in this video.
All images from Unsplash. Credits at end of video.
Background music: She's the Moon by Carl Storm.
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