Paranoid, Schizoid, and Schizotypal Personality Disorders

Schizotypal, Paranoid, and Schizoid personality disorders are all marked by serious problems in interpersonal relationships. Because of this, such individuals have been hard to study. They avoid psychotherapy and participation in research. As a result, data on epidemiology, etiology, and treatment for these disorders are sparse. It is not even clear that these three disorders truly belong in the same personality disorder cluster. Future research focused on the causes of variation in the general population in the individual symptoms of these PDs might lead to greater understanding of their natures and causes.