A personality disorder is a kind of mental disorder in which you have a inflexible and unhealthy pattern of thinking, functioning and behaving. A person with a personality disorder suffers perceiving and relating to conditions and individuals. This causes substantial difficulties and limits in dealings, social activities, work and school. Personality disorders usually occurs in the young people or early adulthood. There are many types of personality disorders. Some types may become less obvious through the middle age. They are paranoid, schizoid, schizotypal, antisocial, borderline, histrionic, narcissistic, avoidant, dependent and obsessive compulsive disorder.