Narcissistic personality disorder (NPD) is a complex and heterogeneous personality disorder characterized by patterns of grandiosity, entitlement, low empathy, and interpersonal difficulties, which can manifest as either grandiose (“thick-skinned”) or vulnerable (“thin-skinned”) forms. Grandiose individuals display arrogance, social dominance, and exploitative behaviors, while vulnerable individuals show shame, inferiority, hypersensitivity, and extreme reactions to criticism. NPD often involves impaired emotional empathy, superficial relationships, and difficulty tolerating disagreement. It is often comorbid with other mental disorders and associated with significant functional impairment and psychosocial disability.
Criteria for diagnosing narcissistic personality disorder are listed in the American Psychiatric Association's Diagnostic and Statistical Manual of Mental Disorders (DSM), while the International Classification of Diseases (ICD) contains criteria only for a general personality disorder since the introduction of the latest edition.