Specific Phobias

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Specific Phobias: Intro - Fear Factor Defined

  • Definition (DSM-5 Criteria):
    • Marked, persistent fear or anxiety about a specific object or situation (e.g., flying, heights, animals, blood-injection-injury).
    • The phobic stimulus almost always provokes immediate fear or anxiety.
    • The phobic object/situation is actively avoided or endured with intense fear.
    • Fear or anxiety is out of proportion to the actual danger posed.
    • Persistent for ≥6 months.
    • Causes clinically significant distress or functional impairment.
  • Epidemiology:
    • High prevalence disorder, often with childhood or early adolescent onset.
    • Female to Male ratio (F:M) is approximately 2:1.

⭐ Specific phobias are one of the most common anxiety disorders, with a lifetime prevalence around 7-9%.

Phobia Subtypes - Catalogue of Creeps

SubtypeCommon ExamplesKey Features
AnimalSpiders, insects, dogsFear triggered by animals or insects.
Natural EnvironmentHeights, storms, waterFear triggered by natural phenomena.
Blood-Injection-Injury (BII)Needles, medical procedures⭐ Biphasic vasovagal response (↑HR then ↓HR, syncope). Unique among phobias.
SituationalAirplanes, elevators, enclosed placesFear triggered by specific situations.
OtherChoking, vomiting; children: loud sounds, clownsFears not fitting other categories.

Etiology Explored - Why We Fear

Multifactorial etiology:

  • Learning Theories:
    • Classical Conditioning: Neutral stimulus + aversive event (e.g., Watson's Little Albert).
    • Vicarious Acquisition (Observational Learning): Witnessing others' fear (Bandura).
    • Informational Transmission: Receiving fear-inducing information.
  • Evolutionary/Preparedness Theory (Seligman):
    • Biologically predisposed to fear historically survival-threatening stimuli (e.g., snakes, heights).
  • Genetic & Familial Factors:
    • Moderate heritability.
    • Familial aggregation.
  • Neurobiological Factors:
    • Brain Structures:
      • Amygdala: Hyperactivity (fear processing).
      • Insula: Interoception, disgust.
      • Prefrontal Cortex (PFC): ↓ regulatory role over amygdala.
    • Neurotransmitters: Serotonin (5-HT), GABA (↓), Glutamate dysregulation.

Amygdala fear circuit diagram

⭐ Mowrer's two-factor theory: Phobias acquired via classical conditioning, maintained via operant conditioning (avoidance learning).

Treatment Strategies - Facing Fears

  • Psychotherapy (First-line & Gold Standard)

    • Exposure Therapy: Core of treatment.
      • Systematic Desensitization: Graded exposure hierarchy, relaxation. In vivo (real-life) is more effective than imaginal.
      • Flooding: Intense, prolonged exposure to phobic stimulus until anxiety subsides.
    • Cognitive Behavioral Therapy (CBT): Modifies maladaptive thoughts & behaviors.
      • Cognitive Restructuring: Challenges irrational beliefs about the phobic stimulus.
      • Relaxation Techniques: E.g., deep breathing, progressive muscle relaxation.
  • Pharmacotherapy (Adjunctive/Situational)

    • Benzodiazepines (BZDs): E.g., lorazepam, diazepam. For infrequent, predictable phobic encounters (e.g., fear of flying). Use with caution (dependence/rebound).
    • SSRIs: E.g., paroxetine, sertraline. Considered if phobia is pervasive or comorbid anxiety/depression exists.
    • Beta-blockers: E.g., propranolol. For performance-related anxiety symptoms (e.g., public speaking), reduces palpitations, tremor.

In vivo exposure therapy is considered the most effective treatment for specific phobias, yielding high success rates.

High-Yield Points - ⚡ Biggest Takeaways

  • Specific phobia: Marked, persistent fear (≥6 months) of a specific object/situation, causing immediate anxiety.
  • The fear is out of proportion to actual danger, leading to significant distress or impairment.
  • Active avoidance of the phobic stimulus is characteristic.
  • Behavior therapy, particularly exposure therapy, is the mainstay of treatment.
  • Blood-Injection-Injury (BII) type is distinct, often causing a vasovagal response (fainting).
  • Pharmacotherapy: SSRIs for persistent cases; benzodiazepines for short-term, situational use (e.g., aerophobia).

Practice Questions: Specific Phobias

Test your understanding with these related questions

A 41 year old married female presented with headache for the last 6 months. She had several consultations. All her investigations were found to be within normal limits. She still insists that there is something wrong in her head and seeks another consultation. The most likely diagnosis is:

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Flashcards: Specific Phobias

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_____ is the fear of small objects.

TAP TO REVEAL ANSWER

_____ is the fear of small objects.

Acarophobia

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