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When a person has narcissistic personality disorder, his relationships may be strained because he takes advantage of others and refuses to recognize their feelings. He may expect total cooperation with his plans and give the appearance of lacking emotions.This mental condition is categorized as a personality disorder. Narcissistic personality disorder, like similar disorders that affect the personality, is marked by personality traits and behaviors that cause distress in social situations and often strain personal relationships.It may be hard to distinguish narcissistic personality disorder from a high level of self-esteem. Some people think it may be genetic while others point to childhood traumas, abuse, and neglect as possible causes .