Personality is the way of thinking, feeling and behaving that makes a person different from other people. An individual’s personality is influenced by experiences, environment (surroundings, life situations) and inherited characteristics. A person’s personality typically stays the same over time.
To be classified as a personality disorder, one’s way of thinking, feeling and behaving deviates from the expectations of the culture, causes distress or problems functioning, and lasts over time.1 The pattern of experience and behavior usually begins by late adolescence or early adulthood and causes distress or problems in functioning. Without treatment, personality disorders can be long-lasting.