Personality Disorders Therapists in New Brunswick

What are personality disorders?

Personality disorders are enduring patterns of inner experience and behaviour that deviate markedly from cultural expectations, are pervasive and inflexible, begin in adolescence or early adulthood, and cause significant distress or functional impairment. The DSM-5 recognizes ten personality disorders grouped into three clusters — Cluster A (odd/eccentric: paranoid, schizoid, schizotypal), Cluster B (dramatic/erratic: antisocial, borderline, histrionic, narcissistic), and Cluster C (anxious/fearful: avoidant, dependent, obsessive-compulsive). Borderline personality disorder is the most commonly treated in outpatient settings.

Can personality disorders be treated effectively?

Yes — despite historical pessimism, research shows that many personality disorders, including borderline personality disorder, can be treated effectively. Significant improvement is achievable, and many people no longer meet diagnostic criteria for a personality disorder after appropriate treatment. Recovery may be slow and non-linear, and certain features (such as impulsivity or self-harm) respond more quickly than others (such as identity and relationship patterns), but positive change is genuinely possible with the right treatment and therapeutic relationship.

What therapy approaches have the best evidence for personality disorders?

Dialectical Behaviour Therapy (DBT) has the strongest evidence for borderline personality disorder, addressing emotion regulation, distress tolerance, interpersonal effectiveness, and mindfulness. Schema Therapy has strong evidence for BPD and other personality disorders, addressing the early maladaptive schemas and modes that drive problematic patterns. Mentalization-Based Treatment (MBT) improves the capacity to understand mental states in oneself and others. Transference-Focused Psychotherapy (TFP) is a psychodynamic approach with evidence for BPD. Longer-term treatment typically produces better outcomes.

What is the difference between a personality disorder and a mental illness like depression?

Mental illnesses (Axis I conditions like depression, anxiety, PTSD) are typically episodic — they come and go and represent a change from the person's baseline. Personality disorders are pervasive and consistent patterns that represent the person's characteristic way of relating to themselves, others, and the world. This distinction has become somewhat blurred as understanding of personality disorders has evolved — many are now understood as rooted in trauma and developmental experience rather than fixed "character defects." Personality disorders and mental illnesses very commonly co-occur.

How are personality disorders diagnosed?

Personality disorder diagnosis requires clinical assessment by a qualified mental health professional — psychologist, psychiatrist, or physician — who evaluates the pattern of inner experience and behaviour across multiple contexts and over time. Because personality features are pervasive and lifelong (rather than episodic), a thorough assessment considers developmental history, relationship patterns, emotional regulation, and functioning across domains. Diagnosis is not given in a single session and should not be based on a checklist alone. It is a clinical formulation, not a label.