Personality refers to an individual’s pattern of behavior and traits that are long-standing and present since adolescence or early adulthood. Aspects of personality include the way people tend to think about themselves, how they relate to people, how they interpret and deal with events in the environment, and how they react emotionally to all of this. Of course, everyone has a bad day and behaves in an uncharacteristic way at times. However, when long-standing patterns of thinking, behaving, and emotional response are rigid, inflexible, and cause significant distress or impairment in functioning then a personality disorder is diagnosed.
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. 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.
There are 10 specific types of personality disorders in the DSM-5-TR.1 Personality disorders are long-term patterns of behavior and inner experiences that differ significantly from what is expected.