All about narcissistic personality disorder

What Causes Narcissistic Personality Disorder and How is it Diagnosed?

There is not a single defined cause of narcissistic personality disorder. But, researchers agree that both genetic and environmental causes are at play. Individuals with narcissistic personality disorder have been found to have less volume of gray matter in the left anterior insula, the part of the brain related to empathy, emotional regulation, compassion, and cognitive functioning.