Behaviors that sometimes indicate narcissistic personality disorder include an exaggerated sense of self-importance and a strong sense of entitlement. Taking advantage of other people to further personal agendas and requiring constant praise and admiration are also behaviors possibly exhibited by those with the disorder.
Some narcissistic traits mimic self-confidence, but narcissism differs because the patient values herself much more than she values other people, explains Mayo Clinic. Other symptoms include having an inability to empathize with the pain of others, preoccupation with fantasies regarding perfection, and expecting full compliance and special favors from others.
Psychotherapy, or talk therapy with a mental health professional, is the most common treatment for narcissistic personality disorder, reports Mayo Clinic.