When narcissism runs out of control it can cause a slew of interpersonal and occupational difficulties, making happiness and success elusive.
There is no disputing the disruptive capacities of narcissistic personality traits. Narcissists suffer from an extreme self-centeredness, which leaves them incapable and uninterested in seeing things from anyone else’s perspective. They suffer from delusions of grandeur boosted by feelings of infallibility, yet they are also highly competitive and insecure. They respond to the success of others with anger and envy, and they feel mistreated and overlooked if others fail to praise and compliment them repeatedly.
Chronic narcissism often leads to a diagnosis of narcissistic personality disorder (NPD), one of 10 personality disorders listed in the Diagnostic and Statistical Manual of Mental Disorders (DSM-5).
At one time, personality disorders were not recognized as a form of mental illness. However, as psychiatrists and psychologists learned more about the specifics of these conditions, it became clear that personality disorders, including NPD, can be legitimately classified as mental health disorders.