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http://www.mayoclinic.com/health/narcissistic-personality-disorder/DS00652

Narcissistic personality disorder

Definition
By Mayo Clinic staff

Narcissistic personality disorder is a mental disorder in which people have an inflated sense of their own importance and a deep need for admiration. Those with narcissistic personality disorder believe that they’re superior to others and have little regard for other people’s feelings. But behind this mask of ultra-confidence lies a fragile self-esteem, vulnerable to the slightest criticism.

Narcissistic personality disorder is one of several types of personality disorders. Personality disorders are conditions in which people have traits that cause them to feel and behave in socially distressing ways, limiting their ability to function in relationships and in other areas of their life, such as work or school.

Narcissistic personality disorder treatment is centered around psychotherapy.

Symptoms

Narcissistic personality disorder is characterized by dramatic, emotional behavior, which is in the same category as antisocial and borderline personality disorders.

Narcissistic personality disorder symptoms may include:
Believing that you’re better than others
Fantasizing about power, success and attractiveness
Exaggerating your achievements or talents
Expecting constant praise and admiration
Believing that you’re special and acting accordingly
Failing to recognize other people’s emotions and feelings
Expecting others to go along with your ideas and plans
Taking advantage of others
Expressing disdain for those you feel are inferior
Being jealous of others
Believing that others are jealous of you
Trouble keeping healthy relationships
Setting unrealistic goals
Being easily hurt and rejected
Having a fragile self-esteem
Appearing as tough-minded or unemotional

Although some features of narcissistic personality disorder may seem like having confidence or strong self-esteem, it’s not the same. Narcissistic personality disorder crosses the border of healthy confidence and self-esteem into thinking so highly of yourself that you put yourself on a pedestal. In contrast, people who have healthy confidence and self-esteem don’t value themselves more than they value others.

(short answer... little bammy is nuts)