This document discusses personality disorders. It begins by defining personality and personality traits, then defines personality disorders as inflexible and maladaptive personality traits that interfere with functioning. It describes three clusters of personality disorders - Cluster A which includes odd or eccentric behavior; Cluster B which includes dramatic, emotional or erratic behavior; and Cluster C which includes anxious or fearful behavior. The document then provides more details on specific personality disorders like paranoid, schizoid, schizotypal, antisocial, borderline, histrionic and narcissistic personality disorders. It discusses symptoms, causes, treatment options for each.