Schizotypal personality disorder (STPD) or schizotypal disorder is a mental disorder characterized by severe social anxiety, thought disorder, paranoid ideation, derealization, transient psychosis, and often unconventional beliefs. People with this disorder feel extreme discomfort with maintaining close relationships with people and avoid forming them, mainly because the subject thinks his or her peers harbor negative thoughts towards them. Peculiar speech mannerisms and odd modes of dress are also symptoms of this disorder. Those with STPD may react oddly in conversations, not respond or talk to themselves.
They frequently interpret situations as being strange or having unusual meaning for them; paranormal and superstitious beliefs are common. Such people frequently seek medical attention for anxiety or depression instead of their personality disorder. Schizotypal personality disorder occurs in approximately 3% of the general population and is more common in males.
The term "schizotype" was first coined by Sandor Rado in 1956 as an abbreviation of "schizophrenic phenotype." STPD is classified as a cluster A personality disorder ("odd or eccentric disorders").