Cluster C Personality Disorders
Avoidant, Dependent, and Obsessive-Compulsive Personality Disorders — the ‘anxious or fearful’ cluster, with strong evidence-based outpatient treatments.
Cluster C personality disorders are characterized by anxiety-driven interpersonal patterns. They are typically more responsive to outpatient treatment than Cluster A or B and respond well to CBT and Schema Therapy.
The DSM-5 Cluster C includes Avoidant, Dependent, and Obsessive-Compulsive Personality Disorders (OCPD — distinct from OCD). These conditions share underlying anxiety and respond well to evidence-based outpatient treatment.
The Three Cluster C Disorders
Avoidant Personality Disorder — pervasive social inhibition, feelings of inadequacy, hypersensitivity to negative evaluation.
Dependent Personality Disorder — pervasive and excessive need to be taken care of; submissive, clinging behavior; fears of separation.
Obsessive-Compulsive Personality Disorder (OCPD) — preoccupation with orderliness, perfectionism, control, at the expense of flexibility and efficiency. Distinct from OCD — OCPD lacks the intrusive thoughts and ritualized behaviors of OCD.
Evidence-Based Treatment
CBT works well across all three — particularly for Avoidant PD (using protocols similar to social anxiety treatment). Schema Therapy has strong evidence for all Cluster C disorders. Dependent PD responds to CBT plus assertiveness training. OCPD responds to CBT and mindfulness-based approaches.
SSRIs are used for co-occurring depression or anxiety.
Frequently Asked Questions
Is OCPD the same as OCD?
No. OCD is an anxiety disorder with intrusive thoughts (obsessions) and ritualized behaviors (compulsions). OCPD is a personality pattern of perfectionism, rigidity, and control without obsessions and compulsions in the OCD sense.
Are Cluster C disorders more treatable than Cluster B?
Generally yes — Cluster C presents with anxiety that motivates treatment-seeking, and the underlying patterns respond well to CBT and Schema Therapy. Cluster B (especially BPD) has strong treatments too but engagement is often harder.
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