Psychiatry: disorder groups
Personality disorders
Personality disorders are long-standing patterns of thinking, feeling and relating that cause significant problems for the person and those around them. Psychiatrists assess them carefully, avoid stigma, manage crises and self-harm, and coordinate structured psychological treatments.
Depth by stage, Pre-U → Consultant (details)
What is it?
Everyone has a personality. A personality disorder is diagnosed when enduring patterns of how a person sees themselves and others, handles emotions and relates to people cause persistent distress or difficulties across many situations, usually from adolescence or early adulthood.
ICD-11 moved to a new approach: it rates the overall severity (mild, moderate, severe) and then describes prominent trait domains — negative affectivity, detachment, dissociality, disinhibition and anankastia — with an optional 'borderline pattern'. DSM-5-TR still lists ten categories, such as borderline, antisocial, narcissistic and avoidant personality disorder, and offers an alternative dimensional model.
People with personality disorders, especially borderline patterns, are frequent users of emergency services after self-harm. Many improve substantially over time, especially with structured therapy.
Why does a psychiatrist need it?
Personality difficulties shape how people present, engage with treatment and respond to services across all of psychiatry. Psychiatrists need to diagnose without labelling unfairly, manage risk, avoid harmful prescribing and repeated admissions, and lead teams in consistent, compassionate care. Forensic work also requires understanding of antisocial and psychopathic traits.
What level is expected at each stage?
Scale: 1. Aware → 2. Understands → 3. Applies → 4. Masters / Teaches. What the levels mean.
- Pre-UNot expected
- Pre-clinicalAwareLearns personality theories in behavioural science.
- ClinicalAwareAware of personality disorder as a concept and the stigma around it.
- HousemanshipAwareMeets patients after self-harm and learns calm, consistent responses.
- Medical officerUnderstandsAssesses personality factors in emergency and ward work and contributes to crisis plans.
- Psych traineeMasters / TeachesDiagnoses using ICD-11 and DSM-5-TR, plans structured treatment and manages risk; examined in all parts.
- Specialist / consultantMasters / TeachesLeads teams in managing complex cases and supervises therapy services.
What are the key topics?
Classification
- ICD-11: personality disorder severity (mild, moderate, severe) and personality difficulty
- ICD-11 trait domains: negative affectivity, detachment, dissociality, disinhibition, anankastia; borderline pattern specifier
- DSM-5-TR clusters A (odd), B (dramatic), C (anxious) and the ten categories
- DSM-5-TR alternative model for personality disorders
- Psychopathy as a concept (Hare's PCL-R) and its forensic use
Causes
- Temperament and heritability of traits
- Childhood adversity, trauma and attachment difficulties
- Developmental models (mentalisation, emotional dysregulation)
- Social and cultural factors
Assessment
- Longitudinal history from the person and informants
- Structured instruments such as SCID-5-PD or IPDE in research and specialist assessment
- Distinguishing from mood, psychotic and neurodevelopmental conditions
- Risk to self and others; patterns of crisis
Management
- Structured therapies: DBT, mentalisation-based treatment (MBT), schema therapy, transference-focused psychotherapy
- Crisis plans and consistent team approach
- Cautious prescribing: no medication is licensed for personality disorder itself; treat comorbid conditions
- Avoiding long or repeated inpatient stays where these are unhelpful
- Team supervision and reflective practice for staff
How is it learned and assessed?
- Behavioural science and psychology lectures
- Emergency and ward work as MO
- MMed Part I (personality psychology) and Part II
- MRCPsych Paper A (psychology, psychopathology), Paper B and CASC (e.g. managing an angry or distressed patient)
Typical textbooks and resources
- Shorter Oxford Textbook of Psychiatry — Oxford University Press
- Cognitive-Behavioral Treatment of Borderline Personality Disorder — Marsha M. Linehan, Guilford Press
- Psychotherapy for Borderline Personality Disorder: Mentalization-Based Treatment — Bateman & Fonagy, Oxford University Press
- NICE guidance on borderline and antisocial personality disorder — NICE (UK)
Titles are widely used examples; editions change. Use university libraries or legitimate purchases.
Common questions
Can personality disorders improve?
Yes. Many people, especially with borderline patterns, improve considerably over years, and structured therapies such as DBT or mentalisation-based treatment help further.
Is a personality disorder a person's fault?
No. Personality disorders develop from a mix of inherited temperament and life experiences, often including childhood adversity. Treating people with respect and consistency is part of good care.