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Clinical Condition Guide

Obsessive-Compulsive
Disorder (OCD)

A chronic condition characterized by intrusive, unwanted thoughts (obsessions) and repetitive behaviors or mental acts (compulsions) performed to reduce distress.

2-3%
Prevalence
~19
Onset Age
1:1
Ratio
60-70%
Response Rate

DSM-5-TR Diagnostic Criteria

Obsessions

Intrusive and unwanted thoughts

  • • Recurrent, persistent thoughts, urges, or images experienced as intrusive and unwanted
  • • Person attempts to ignore, suppress, or neutralize with another thought or action

Compulsions

Repetitive behaviors or mental acts

  • • Repetitive behaviors or mental acts performed in response to obsessions
  • • Aimed at preventing or reducing distress, but not connected realistically or clearly excessive

Additional Criteria

Diagnostic requirements:

  • • Obsessions/compulsions are time-consuming (>1 hour/day) or cause significant distress
  • • Not attributable to substance use or medical condition
  • • Not better explained by another mental disorder

Assessment Protocols

Validated tools for screening and severity tracking

Y-BOCS

Yale-Brown Obsessive Compulsive Scale

Criterion-standard severity measure. 10 items assessing obsessions and compulsions.

Scoring:

0-7: Subclinical | 8-15: Mild | 16-23: Moderate | 24-31: Severe | 32-40: Extreme

Time:15-20 minutes

OCI-R

Obsessive-Compulsive Inventory-Revised

Brief 18-item self-report covering 6 OCD symptom dimensions.

Scoring:

Cut-off score: 21+ suggests clinically significant OCD symptoms

Time:5-10 minutes

DOCS

Dimensional Obsessive-Compulsive Scale

Assesses 4 primary OCD dimensions: contamination, responsibility, symmetry, taboo thoughts.

Scoring:

Provides subscale scores for different OCD presentations

Time:10-15 minutes

Causes & Etiology

Neurobiological

  • CSTC circuit dysfunction
  • Serotonin dysregulation
  • Elevated activity in orbitofrontal cortex and anterior cingulate
  • Reduced caudate nucleus volume in some studies

Genetic

  • Heritability: 45-65%
  • Polygenic inheritance
  • SLC1A1, DLGAP3, BTBD3 genes implicated
  • 10x increased risk with first-degree relative

Environmental

  • Childhood trauma
  • PANDAS/PANS
  • Stressful life events
  • Parental accommodation

Cognitive

  • Inflated sense of responsibility
  • Thought-action fusion
  • Intolerance of uncertainty
  • Overestimation of threat
Evidence-Based

Scientific Sources

Y-BOCS Validation

Goodman WK, Price LH, et al. The Yale-Brown Obsessive Compulsive Scale: I. Development, use, and reliability. Arch Gen Psychiatry. 1989;46(11):1006-1011.

DSM-5-TR Criteria

American Psychiatric Association. Diagnostic and Statistical Manual of Mental Disorders, Fifth Edition, Text Revision (DSM-5-TR). 2022.

ERP Treatment Efficacy

Olatunji BO, Davis ML, et al. Cognitive-behavioral therapy for obsessive-compulsive disorder: A meta-analysis of treatment outcome. Clin Psychol Rev. 2013;33(8):1206-1217.

Neurobiological Model

Menzies L, Chamberlain SR, et al. Integrating evidence from neuroimaging and neuropsychological studies of obsessive-compulsive disorder. Neurosci Biobehav Rev. 2008;32(3):525-549.

SSRI Pharmacotherapy

Soomro GM, Altman D, et al. Selective serotonin re-uptake inhibitors (SSRIs) versus placebo for obsessive compulsive disorder (OCD). Cochrane Database Syst Rev. 2008;(1):CD001765.

Comorbidity Patterns

Ruscio AM, Stein DJ, et al. The epidemiology of obsessive-compulsive disorder in the National Comorbidity Survey Replication. Mol Psychiatry. 2010;15(1):53-63.

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