Personality traits are enduring, usually rigid patterns of behavior, thinking (cognition), and emoting expressed in a variety of circumstances and situations and throughout one’s life (typically from early adolescence onward). Some personality traits are harmful to both oneself and to others. These are the dysfunctional traits. Often they cause discomfort and the person bearing these traits is unhappy and self-critical. This is called ego-dystony. At other times, even the most pernicious personality traits are happily endorsed and even flaunted by the patient. This is called “ego-syntony”.
The Diagnostic and Statistical Manual (DSM) describes 12 ideal “prototypes” of personality disorders. It provides lists of seven to nine personality traits per each disorder. These are called “diagnostic criteria”. Whenever five of these criteria are met, a qualified mental health diagnostician can safely diagnose the existence of a personality disorder.
But important caveats apply.
No two people are alike. Even subjects suffering from the same personality disorder can be worlds apart as far as their backgrounds, actual...