The word personality describes deeply ingrained behavior patterns and the way individuals perceive, relate to, and think about themselves and the world. Personality traits are enduring patterns of perceiving, relating to and thinking about the environment and oneself that are exhibited in a wide range of social and personal contexts. A personality disorder has the characteristics of an enduring pattern of inner experience and behavior that deviates markedly from the expectations of the individual's culture, inflexibility and pervasiveness, an onset in adolescence or early adulthood stability over time and causing significant impairment in functioning or internal distress. Personality disorders are not isolated, atypical episodes of maladaptive behavior.
Schizoid personality disorder is a pattern of indifference to social relationships, with a limited range of emotional expression and experience. The disorder manifests itself by early adulthood through social and emotional detachments that prevent people from having close relationships. People with it are able to function in everyday life, but will not develop meaningful relationships with others. They are typically loners and may be prone to excessive daydreaming as well as forming attachments to animals. They may do well at solitary jobs others would find intolerable. There is evidence indicating the disorder may be the start of schizophrenia, or just a very mild form of it. People with schizoid personality disorder are in touch with reality unless they develop schizophrenia.