At ST&A Psychology Manly, our clinicians are experienced in providing therapy for people with personality disorders. A personality disorder is a distinct mental illness, defined by personality styles that can be troubling enough to create problems with relating to other people in healthy, normal ways. Personality disorders tend to appear in adolescence or early adulthood, continue over many years and cause a great deal of distress. During that time they can cause enormous conflict with other people, cause relationships to fail or prevent them from developing in the first place, interfere with someone’s ability to function appropriately in social situations and get in the way of reaching life goals.