The personality disorder that is most commonly diagnosed and considered to be the most serious, severe, and disabling of all personality disorders is:

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Borderline personality disorder is the most commonly diagnosed personality disorder and is considered to be the most serious, severe, and disabling. Individuals with this disorder have unstable moods, behavior, and relationships, and are at high risk for self-harm and suicide. Antisocial personality disorder is also considered to be serious, but it may not be diagnosed as frequently as borderline personality disorder. Narcissistic personality disorder and avoidant personality disorder are also serious, but may not be as disabling as borderline personality disorder.

The Personality Disorder That Is Most Commonly Diagnosed and Considered