DefinitionSchizoid personality disorder is a psychiatric condition in which a person has a lifelong pattern of indifference to others and social isolation.Alternative NamesPersonality disorder - schizoidCauses, incidence, and risk factorsPersonality disorders are patterns of behaviors and relationships that interfere with a person's life over many years. The cause of schizoid personality disorder is unknown. Estimates of its incidence vary.This disorder may be associated with schizophrenia and shares many of the same risk factors. However, schizoid personality disorder is not as disabling as schizophrenia, because it does not cause hallucinations, delusions, or the complete disconnection from reality that occurs in untreated (or treatment-resistant) schizophrenia.SymptomsA person with schi