What causes schizotypal personality disorder?

Schizotypal personality disorder, like most personality disorders, is likely caused by genetic and environmental factors. The Mayo Clinic explains that schizotypal personality disorder may start developing when children are still young. As children grow, they are expected to learn appropriate social rules and behaviors. Those who develop schizotypal personality disorder may experience a breakdown in this development along the way. When young children are not able to learn how to interact socially, they may grow up to be more socially anxious. Rarely, they may develop schizotypal personality disorder. Other factors that may increase the likelihood of developing schizotypal personality disorder include early childhood trauma and a history of abuse. If your family members have a history of mental illness or schizophrenia, you may also be at an increased risk for the disorder.