Narcissistic personality disorder (NPD) is a long-term pattern of abnormal behavior characterized by exaggerated feelings of self-importance, an excessive need for admiration, and a lack of understanding of others’ feelings. People affected by this disorder often spend a lot of time thinking about achieving power or success, or about their appearance. They often take advantage of the people around them. The behavior typically begins by early adulthood, and occurs across a variety of situations. Subtypes include an “overt” or “grandiose” subtype, characterized by grandiosity, arrogance, and boldness. Those with “narcissistic grandiosity” express behavior through interpersonally exploitative acts, lack of empathy, intense envy, aggression, and exhibitionism. Individuals with NPD generally do not seek treatment and have poor insight and fail to recognize their perception and behavior as inappropriate and problematic due to their excessively positive self-image. Prognosis for treatment is generally poor and is associated with slower treatment progress and higher dropout rates.