Researchers today dont know what causes paranoid personality disorder. There are
many theories, however, about
the possible causes of paranoid personality disorder. Most
professionals subscribe to a
biopsychosocial model of causation that is, the causes
of are likely due to biological and
genetic factors, social factors (such as how a person interacts
in their early development with
their family and friends and other children), and psychological factors (the individuals personality and
temperament, shaped by their environment and learned coping
skills to deal with stress). This suggests that no single factor is
responsible rather, it is the complex and likely intertwined
nature of all three factors that are important. If a person has this personality disorder, research suggests that there is a slightly increased risk for this to pass down to the children