Common signs of narcissistic personality disorder include a grandiose sense of self-importance, the feeling of being special or unique, the need for excessive admiration, a strong sense of entitlement and a lack of empathy, according to the diagnostic criteria listed by Psych Central. Narcissistic individuals may also regularly exhibit haughty or arrogant behavior.
Narcissistic individuals often envy others or believe others are envious of them, and they may exploit others to achieve their own goals, according to Psych Central. These individuals may also be preoccupied with fantasies of unlimited power, beauty, success or intelligence. Another sign that someone is narcissistic is that he is highly reactive to criticism, often changing the subject when asked a question that potentially reveals a vulnerability or deficiency, states Psychology Today. Below a self-confident facade, he may also struggle with low self-esteem.
Narcissistic individuals may be unnecessarily defensive and self-righteous, according to Psychology Today. They may react with anger or rage to viewpoints that contradict their own, and they may project qualities they are unwilling to accept in themselves onto other people, focusing on others' flaws while refusing to acknowledge their own. A final sign of narcissism is poor interpersonal boundaries, possibly due to the belief that other people exist only to serve the narcissist's needs.