What are the causes of schizoid personality disorder?

What are the causes of schizoid personality disorder?

Rhoda Hahn (Psychiatrist) gives expert video advice on: What are the signs of schizoid personality disorder?; Who is at risk for schizoid personality disorder?; What are the treatments for a schizoid personality disorder? and more...

Schizoid personality disorder may be more common in the first degree relatives of patients with schizophrenia. Which would suggest, perhaps, some kind of genetic component involved. There isn't any known specific cause though of the disorder.