自恋狂

Narcissism is a term with a wide range of meanings, depending on whether it is used to describe a central concept of psychoanalytic theory, a mental illness, a social or cultural problem, or simply a personality trait. Except in the sense of primary narcissism or healthy self-love, "narcissism" usually is used to describe some kind of problem in a person or group's relationships with self and others. In everyday speech, "narcissism" often means egoism, vanity, conceit, or simple selfishness. Applied to a social group, it is sometimes used to denote elitism or an indifference to the plight of others. In psychology, the term is used to describe both normal self-love and unhealthy self-absorption due to a disturbance in the sense of self.
Narcissistic personality disorder (NPD) is a personality disorder in which the individual is described as being excessively preoccupied with issues of personal adequacy, power, prestige and vanity. This condition affects one percent of the population. First formulated in 1968, it was historically called megalomania, and it is closely linked to egocentrism.