Personality disorder clusters

Ten personality disorders is a lot to memorize — until you learn the three clusters, each with a one-word personality. Cluster A is odd/eccentric. Cluster B is dramatic/erratic. Cluster C is anxious/fearful. Nail those three vibes and you can place any exemplar and answer most cluster questions.

Cluster A — the odd-eccentric ("Weird") cluster. Paranoid PD — pervasive distrust and suspiciousness of others' motives. Schizoid PD — detachment from relationships and restricted emotion; a genuine loner who prefers solitude. Schizotypal PD — social anxiety plus odd beliefs, magical thinking, and eccentric behavior/perceptions (the one on the schizophrenia spectrum). Distinguish the pair that trips people up: schizoid = doesn't want relationships; schizotypal = wants them but is too odd/anxious and has perceptual quirks.

Cluster B — the dramatic-erratic-emotional ("Wild") cluster. Antisocial PD — disregard for and violation of others' rights, deceit, no remorse (must be 18+, with conduct disorder before 15). Borderline PD — instability of relationships, self-image, and affect, plus impulsivity and frantic efforts to avoid abandonment. Histrionic PD — excessive emotionality and attention-seeking. Narcissistic PD — grandiosity, need for admiration, lack of empathy.

Cluster C — the anxious-fearful ("Worried") cluster. Avoidant PD — social inhibition from fear of criticism/rejection (wants closeness but is too afraid). Dependent PD — clinging, submissive need to be taken care of. Obsessive-compulsive PD (OCPD) — preoccupation with order, perfectionism, and control (a personality style, not OCD — no true obsessions/compulsions).

Clinical Pearl: Lock in the three cluster labels — A = odd (Weird), B = dramatic (Wild), C = anxious (Worried) — and the two classic discriminations: avoidant wants closeness but fears rejection vs. schizoid simply prefers to be alone, and OCPD (rigid perfectionist personality) is not OCD (ego-dystonic obsessions/compulsions).