14.6 — Personality Disorders

The most contested category in psychiatry, and the most casually thrown around outside it.

The idea: a person's enduring pattern of thinking, feeling and relating is itself markedly different from what their culture expects, is inflexible across situations, began by adolescence or early adulthood, and causes distress or impairment.

Not an episode. A pattern.

The problems with the category, stated first

Because they matter for how you should use this page.

The categories overlap heavily. Most people meeting criteria for one meet criteria for others, which suggests the boundaries are not carving anything real.

They have been used as a way of dismissing people. Particularly "borderline", which has been applied disproportionately to women and has functioned in some settings as a label for a patient a clinician finds difficult.

The trait basis is better supported than the categories. The newer models describe personality difficulty in terms of severity plus trait dimensions — closer to the Big Five (9.2) — and this is the direction the field is moving.

And they are frequently the downstream effect of trauma (13.10), particularly the borderline pattern.

So: use these as descriptions of patterns, treat the labels with suspicion, and never apply one to somebody in your life.

The clusters

Cluster A, the odd or eccentric. Paranoid, schizoid, schizotypal. Suspicion, detachment, unusual beliefs and perceptual experiences.

Cluster B, the dramatic or erratic. Antisocial, borderline, histrionic, narcissistic. This is the cluster that produces most of the difficulty in relationships, and most of the misuse of the words.

Cluster C, the anxious or fearful. Avoidant, dependent, obsessive-compulsive personality. Least discussed and the most common, and these are the people who suffer quietly rather than causing visible trouble.

The three worth understanding

Borderline personality disorder

Often better described as an emotion regulation disorder, and many clinicians and people with the diagnosis prefer that framing.

The core is instability — of emotion, of relationships, of self-image.

Intense emotional reactions that rise fast and take a long time to settle. Frantic efforts to avoid abandonment, real or perceived. Relationships that swing between idealisation and devaluation. An unstable sense of who they are. Impulsivity. Recurrent self-harm or suicidal behaviour. Chronic emptiness. Intense anger. And transient paranoid or dissociative states under stress.

What it is like from inside: everything is louder and lasts longer. The fear of abandonment is not manipulation; it is terror, and the behaviour that follows is frequently the thing that produces the abandonment.

Strongly associated with childhood trauma and invalidating environments — a childhood in which emotional reactions were consistently dismissed or punished.

And it is treatable, which is the important part. Dialectical behaviour therapy was developed specifically for it, has good evidence, and teaches exactly the skills in 15.5. Long-term follow-up studies find that a large majority of people no longer meet criteria after several years, particularly with treatment. This is not a life sentence and it is frequently presented as one.

Antisocial personality disorder

A pervasive pattern of disregard for the rights of others since around age fifteen — repeated law-breaking, deceitfulness, impulsivity, aggression, reckless disregard for safety, irresponsibility, and absence of remorse.

Related to but not identical with psychopathy (14.10), which is a narrower construct.

Treatment outcomes are poor, and this is one of the few places in this volume where that has to be said plainly. Interventions focused on specific behaviours and on situational risk do better than insight-oriented approaches.

Narcissistic personality disorder

Grandiosity, a need for admiration, and limited empathy — in a pervasive pattern.

And a less-known second presentation: the vulnerable or covert form, in which the grandiosity is internal and the visible features are hypersensitivity to criticism, resentment and withdrawal.

Underneath, in many accounts, is fragility — the self-image requires constant external maintenance (5.6), which is why criticism produces such disproportionate reactions.

Two practical points. Do not diagnose people with this. The word is now used for anybody selfish, which has made it useless. And if you are dealing with the pattern, 13.2 has the handling — lower your expectations to what is available, do not rely on them emotionally, and do not attempt to make them see it.

Cluster C, which affects far more people

Avoidant — intense fear of criticism and rejection, avoidance of relationships and situations despite wanting them. Overlaps heavily with social anxiety (14.3) and responds to similar treatment.

Dependent — difficulty making decisions, needing others to take responsibility, fear of being unable to cope alone, going to excessive lengths to obtain support.

Obsessive-compulsive personality — preoccupation with order, perfectionism and control, at the cost of flexibility and completion. Not the same as OCD (14.3), and frequently the person does not experience it as a problem while everybody around them does.

These are the quiet ones, they are common, they respond reasonably to therapy, and most people carrying them have never considered getting help.

What to actually do with this page

Do not diagnose anybody, including yourself. The categories are contested, the overlap is enormous, and a label applied by a non-professional does damage — to the person and to your ability to see them accurately (10.5).

Do use the patterns to adjust expectations. From 13.2: if somebody consistently cannot do a thing, planning around it works better than waiting for them to change.

If you recognise yourself, get assessed properly — and know that for the borderline pattern in particular, the treatment is genuinely effective and the long-term outlook is good.

And use the skills regardless of any label. DBT skills (15.5) work for anybody whose emotions run hot and last long, diagnosis or not. You do not need a category to use a technique.

Next: 14.7 covers addiction, eating disorders and self-harm — three things that share a mechanism.