Personality disorder is defined, as enduring subjective experiences and behavior that deviate from cultural standards, are rigidly pervasive have an onset in adolescence or early adulthood, are stable through time, and lead to unhappiness and impairment. People with personality disorder are far more likely to refuse psychiatric help and to deny their problems than are people with anxiety disorder, depressive disorder, or obsessive-compulsive disorder.
Personality disorder is grouped into three clusters. Cluster A covers the paranoid, schizoid, and schizotpal personality disorder; people with these disorders are often perceived as odd and eccentric. Cluster B is made up of the anti-social, borderline, histrionic and narcissistic personality disorders, people with these disorders often seem dramatic, emotional, and erratic. Cluster C includes the avoidant, dependent and obsessive-compulsive personality disorder.