Social Anxiety Disorder: Etiology, Presentation, and Evidence-Based Treatment

Social anxiety disorder (SAD) (formerly social phobia) is a persistent fear of negative evaluation in social/performance situations, causing avoidance and functional impairment.

Etiology (Biopsychosocial)

• Genetic: Heritability ~30–50%; polygenic; overlaps with neuroticism, introversion.
• Neurobiological: Amygdala hyperreactivity to social threat; prefrontal regulatory deficits; serotonin/dopamine dysregulation.
• Temperamental: Behavioral inhibition (BI) in childhood—strong predictor.
• Environmental: Adverse childhood experiences, bullying, overprotective parenting, cultural factors.

Clinical Presentation (DSM-5)

• Fear/anxiety in ≥1 social situation (conversation, meeting strangers, eating/drinking in public, performing).
• Fear of negative evaluation (humiliation, rejection, offense).
• Situations avoided or endured with intense distress.
• Duration ≥6 months; not due to substance/medical condition/other disorder.
• Specifiers: Performance-only (public speaking); generalized.

Physical Symptoms

Blushing, sweating, trembling, tachycardia, nausea, dry mouth, muscle tension, urinary urgency—driven by sympathetic surge.

Evidence-Based Treatment

1. Cognitive Behavioral Therapy (CBT): Gold standard. Components: cognitive restructuring, exposure (in vivo/imaginal), social skills training, attention training. Effect size d ~0.8–1.2.
2. Pharmacotherapy: SSRIs (paroxetine, sertraline, escitalopram) first-line; SNRIs (venlafaxine XR) alternative. Benzodiazepines not recommended (dependence, cognitive interference with CBT).
3. Combined CBT + SSRI: Superior to either alone for severe cases.
4. Acceptance and Commitment Therapy (ACT), Mindfulness-Based CBT: Emerging evidence.

Prognosis

Without treatment: chronic, low remission (~20% at 12 yr). With CBT: 50–60% remission; gains maintained at follow-up. Early intervention improves trajectory.