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Narcissistic personality disorder ( NPD ) is a personality disorder in which there 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 it 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. The cause of narcissistic personality disorder is unknown. It is a personality disorder classified within cluster B by the Diagnostic and Statistical Manual of Mental Disorders . Diagnosis is by a healthcare professional interviewing the person in question. The condition needs to be differentiated from mania and substance use disorder . Treatments have not been well studied. Therapy is often difficult as people with the disorder frequently do not consider themselves to have a problem. About one percent of people are believed to be affected at some point in their life. It appears to occur more often in males than females and affects young people more than older people. The personality was first described in 1925 by Robert Waelder while the current name for the condition came into use in 1968. Signs and symptoms People with narcissistic personality disorder are characterized by their persistent grandiosity , excessive need for admiration, and a disdain and lack of empathy for others. These individuals often display arrogance, a sense of superiority, and power-seeking behaviors. Narcissistic personality disorder is different from having a strong sense of self-confidence; people with NPD typically value themselves over others to the extent that they disregard the feelings and wishes of others and expect to be treated as superior regardless of their actual status or achievements. In addition, people with NPD may exhibit fragile egos , an inability to tolerate criticism, and a tendency to belittle others in an attempt to validate their own superiority. According to the DSM-5 , individuals with NPD have most or all of the following symptoms, typically without commensurate qualities or accomplishments: Grandiosity with expectations of superior treatment from others Fixated on fantasies of power, success, intelligence, attractiveness, etc. Self-perception of being unique, superior and associated with high-status people and institutions Needing constant admiration from others Sense of entitlement to special treatment and to obedience from others Exploitative of others to achieve personal gain Unwilling to empathize with others' feelings, wishes, or needs Intensely envious of others and the belief that others are equally envious of them Pompous and arrogant demeanor NPD usually develops by adolescence or early adulthood. It is not uncommon for children and teens to display some traits similar to NPD, but these are typically transient without meeting full criteria for the diagnosis. True NPD symptoms are pervasive, apparent in various situations, and rigid, remaining consistent over time. The symptoms must be severe enough that they significantly impair the individual's ability to develop meaningful relationships with others. Symptoms also generally impair an individual's ability to function at work, school, or in other important settings. According to the DSM-5, these traits must differ substantially from cultural norms in order to qualify as symptoms of NPD. Associated features People with NPD tend to exaggerate their skills and accomplishments as well as their level of intimacy with people they consider to be high-status. Their sense of superiority may cause them to monopolize conversations and to become impatient or disdainful when others talk about themselves. In the course of a conversation, they may purposefully or unknowingly disparage or devalue the other person by overemphasizing their own success. When they are aware that their statements have hurt someone else, they tend to react with contempt and to view it as a sign of weakness. When their own ego is wounded by a real or perceived criticism, their anger can be disproportionate to the situation, but typically, their actions and responses are deliberate and calculated. Despite occasional flare-ups of insecurity, their self-image is primarily stable (i.e., overinflated). To the extent that people are pathologically narcissistic, they can be controlling, blaming, self-absorbed, intolerant of others' views, unaware of others' needs, the effects of their behavior on others, and insist that others see them as they wish to be seen. Narcissistic individuals use various strategies to protect the self at the expense of others. They tend to devalue, derogate, insult, blame others and they often respond to threatening feedback with anger and hostility. Since the fragile ego of individuals with NPD is hypersensitive to perceived criticism or defeat, they are prone to feelings of shame , humiliation and worthlessness over minor or even imagined incidents. They usually mask these feelings from others with feigned humility, isolating socially or they may react with outbursts of rage, defiance, or by seeking revenge. The merging of the "inflated self-concept" and the "actual self" is seen in the inherent grandiosity of narcissistic personality disorder. Also inherent in this process are the defense mechanisms of denial , idealization and devaluation . According to the DSM-5, "Many highly successful individuals display personality traits that might be considered narcissistic. Only when these traits are inflexible, maladaptive, and persisting and cause significant functional impairment or subjective distress do they constitute narcissistic personality disorder." Although overconfidence tends to make individuals with NPD ambitious, it does not necessarily lead to success and high achievement professionally. These individuals may be unwilling to compete or may refuse to take any risks in order to avoid appearing like a failure. In addition, their inability to tolerate setbacks, disagreements or criticism, along with lack of empathy, make it difficult for such individuals to work cooperatively with others or to maintain long-term professional relationships with superiors and colleagues. Causes and mechanisms The cause of this disorder is unknown. Experts tend to apply a biopsychosocial model of causation, meaning that a combination of environmental, social, genetic and neurobiological factors likely play a role. Genetic There is evidence that narcissistic personality disorder is heritable, and individuals are much more likely to develop NPD if they have a family history of the disorder. Studies on the occurrence of personality disorders in twins determined that there is a moderate to high heritability for narcissistic personality disorder. However the specific genes and gene interactions that contribute to its cause, and how they may influence the developmental and physiological processes underlying this condition, have yet to be determined. Environment Environmental and social factors are also thought to have a significant influence on the onset of NPD. In some people, pathological narcissism may develop from an impaired attachment to their primary caregivers, usually their parents. This can result in the child's perception of himself/herself as unimportant and unconnected to others. The child typically comes to believe they have some personality defect that makes them unvalued and unwanted. Overindulgent, permissive parenting as well as insensitive, over-controlling parenting, are believed to be contributing factors. According to Groopman and Cooper (2006), the following factors have been identified by various researchers as possible factors that promote the development of NPD: An oversensitive temperament (personality traits) at birth. Excessive admiration that is never balanced with realistic feedback. Excessive praise for good behaviors or excessive criticism for bad behaviors in childhood. Overindulgence and overvaluation by parents, other family members, or peers. Being praised for perceived exceptional looks or abilities by adults. Severe emotional abuse in childhood. Unpredictable or unreliable caregiving from parents. Learning manipulative behaviors from parents or peers. Valued by parents as a means to regulate their own self-esteem . Cultural elements are believed to influence the prevalence of NPD as well since NPD traits have been found to be more common in modern societies than in traditional ones. Neurobiology There is little research into the neurological underpinnings of narcissistic personality disorder. Nevertheless, recent research has identified a structural abnormality in the brains of those with narcissistic personality disorder, specifically noting less volume of gray matter in the left anterior insula . Another study has associated the condition with reduced gray matter in the prefrontal cortex . The brain regions identified in these studies are associated with empathy , compassion , emotional regulation , and cognitive functioning. These findings suggest that narcissistic personality disorder is related to a compromised capacity for emotional empathy and emotional regulation.