Which clinical feature best distinguishes Obsessive-Compulsive Disorder (OCD) from Generalized Anxiety Disorder (GAD) in a 28-year-old woman presenting with persistent intrusive thoughts and anxiety?

Explanation

## Distinguishing OCD from GAD ### Key Phenomenological Difference **Key Point:** The hallmark discriminator between OCD and GAD is the **presence of compulsions and ego-dystonia** in OCD versus worry-focused rumination without stereotyped rituals in GAD. ### Feature Comparison Table | Feature | OCD | GAD | | --- | --- | --- | | **Intrusive thoughts** | Ego-dystonic (unwanted, resisted) | Ego-syntonic (worry feels justified) | | **Content** | Specific obsessions (contamination, harm, symmetry) | Generalized worry (finances, health, relationships) | | **Compulsions** | Present (ritualistic, time-consuming) | Absent (only worry/rumination) | | **Insight** | Good to fair (recognizes irrationality) | Variable (may rationalize worry) | | **Resistance** | Active resistance to compulsions | No resistance needed (no rituals) | | **Distress** | From obsessions AND failed resistance | From worry itself | ### Why Option 1 is Correct **High-Yield:** Patients with OCD **recognize that their obsessions are irrational** and **actively resist compulsions**, even though resistance is difficult. This combination of ego-dystonia + insight + resistance is pathognomonic for OCD. - GAD patients may have insight into worry being excessive, but they do NOT perform ritualistic compulsions. - OCD patients experience the obsession as foreign and unwanted, then feel compelled to perform a specific ritual to neutralize the anxiety. ### Clinical Pearl **Clinical Pearl:** A patient who says "I know my fear of contamination is unreasonable, but I must wash my hands 20 times" has OCD. A patient who says "I worry about my health, finances, and relationships constantly" has GAD. ### Diagnostic Criteria Anchor DSM-5 OCD requires: 1. Obsessions (intrusive, unwanted, ego-dystonic) 2. Compulsions (repetitive behaviors or mental acts performed to reduce distress) 3. Time-consuming (≥1 hour/day) or significant functional impairment DSM-5 GAD requires: 1. Excessive worry about multiple domains 2. Difficulty controlling worry 3. No requirement for compulsions or rituals [cite:DSM-5 Diagnostic and Statistical Manual of Mental Disorders]