Marked, irrational fear cued by a specific object or situation, with avoidance and impairment ≥6 months.
Also known as: specific phobia, phobia, simple phobia
Overview
DSM-5-TR: marked fear or anxiety about a specific object or situation (e.g., animals, heights, blood/injection/injury, closed spaces, flying). The phobic stimulus almost always provokes immediate fear, is actively avoided or endured with intense distress, is out of proportion to the actual danger, and persists ≥6 months with significant impairment. Five specifier types: animal, natural environment, blood-injection-injury (BII), situational, other.
Epidemiology
12-month US prevalence ~7-9%; lifetime ~12-15%. Most common anxiety disorder. Female predominance ~2:1 except BII (more equal). Onset typically childhood (median ~7-10 yo); blood-injection-injury and situational often persist into adulthood.
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Question 1PsychiatryMedium
A 28-year-old flight attendant presents because an intense fear of flying is threatening her job. For the past year, every boarding triggers immediate tachycardia, sweating, and dread, and she now calls in sick to avoid scheduled flights. She acknowledges the fear is excessive and has no symptoms in other settings. She has no medical comorbidities and takes no medications, and her mental status exam is otherwise unremarkable. Which of the following is the most appropriate initial management?
AGraded exposure-based behavioral therapy
BDaily SSRI antidepressant pharmacotherapy
CAs-needed beta-blocker before each flight
DScheduled oral benzodiazepine medications
Reveal answer & full explanation
Correct answer: A — Graded exposure-based behavioral therapy
AGraded exposure-based behavioral therapy✓
BDaily SSRI antidepressant pharmacotherapy
CAs-needed beta-blocker before each flight
DScheduled oral benzodiazepine medications
Why Graded exposure-based behavioral therapy is correct
Exposure-based CBT (in vivo, imaginal, or virtual reality) is the guideline-defined first-line treatment for specific phobia and is more effective than any medication.
Graded exposure with response prevention directly extinguishes the conditioned amygdala-driven fear response; many situational phobias resolve in 1-5 sessions, including single-session exposure.
Why the others are wrong
Scheduled oral benzodiazepine medications: a short-acting benzodiazepine is useful only for one-time situational use such as a single unavoidable flight or MRI; it does not cure the phobia and may blunt the new learning needed for extinction, so it is not appropriate ongoing management.
Daily SSRI antidepressant pharmacotherapy: SSRIs are not first-line for isolated specific phobia and are reserved for comorbid anxiety or depression, which this patient does not have.
As-needed beta-blocker before each flight: a beta-blocker blunts autonomic arousal before exposure but does not address the underlying conditioned fear or avoidance and is not first-line therapy.
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Conditioned amygdala-driven fear response. Genetic preparedness for evolutionarily salient threats (snakes, heights, blood). BII phobia uniquely associated with a biphasic vasovagal response: initial sympathetic surge followed by parasympathetic-mediated bradycardia and syncope.
Clinical presentation
Symptoms
Immediate intense fear/anxiety on exposure (or anticipation) of the phobic stimulus
Active avoidance of the trigger
Recognition that the fear is excessive (less reliable in children)
Physiologic symptoms during exposure: tachycardia, sweating, trembling, dyspnea, GI distress
Signs / physical exam
Sympathetic activation during exposure in most subtypes
Patient who consistently avoids flying despite job consequences, or faints at sight of blood during routine venipuncture.
Differential diagnosis
Social anxiety disorder — Fear is specifically of social evaluation, not the object/situation itself
Panic disorder with agoraphobia — Fear of escape difficulty or incapacitation; multiple situations, not single object
Obsessive-compulsive disorder — Avoidance driven by obsessions (contamination, harm) rather than direct fear of object
PTSD — Avoidance linked to a specific past traumatic event with reexperiencing and arousal symptoms
Separation anxiety disorder — Fear of separation from attachment figures, not of an object
Realistic fear / cultural belief — Fear proportionate to actual risk or culturally sanctioned
Diagnostic workup
Diagnostic criteria
DSM-5-TR: marked fear of specific object/situation, immediate, avoidance/endurance with distress, out of proportion, ≥6 months, impairment, not better explained by another disorder. Specify subtype.
Labs
Not routinely needed; clinical diagnosis
Imaging
Not indicated
Diagnostic algorithm
Subtype
Examples
Onset
Key feature
Animal
Spiders, dogs, snakes
Childhood
Most common; often co-occurring phobias
Natural environment
Heights, storms, water
Childhood
May overlap with situational
Blood-injection-injury
Venipuncture, injury, dental
Childhood
Vasovagal syncope; treat with applied tension
Situational
Flying, elevators, enclosed spaces
Mid-20s peak
Bimodal onset; high functional impact
Other
Choking, vomiting, loud sounds
Variable
Heterogeneous
DSM-5-TR specific phobia subtypes — note unique vasovagal physiology of the blood-injection-injury type.
Treatment
First-line
Exposure-based CBT (in vivo, imaginal, or virtual reality) — highly effective; single-session exposure can be curative for many specific phobias
Graded exposure with response prevention is the gold standard
Second-line / adjunct
Short-acting benzodiazepine (lorazepam, alprazolam) for one-time situational use (e.g., MRI, flight) — does NOT cure the phobia and may impair learning during exposure
Beta-blocker before procedure for autonomic blunting
SSRIs generally not first-line; reserved for comorbid anxiety/depression
Complications
Avoidance of medical care (BII phobia → unvaccinated, delayed diagnosis, untreated dental disease)
Exposure therapy is more effective than any medication for specific phobia and can be completed in 1-5 sessions for many patients.
BII phobia is the only phobia with prominent vasovagal syncope — treat with applied tension, not relaxation alone.
Benzodiazepines used during exposure may blunt the new learning needed for extinction — use sparingly.
Children may not recognize fear as excessive; reliance on parental report and functional impact is essential.
Always ask about avoidance of healthcare — BII phobia is a major driver of missed care.
References
DSM-5-TR — American Psychiatric Association. DSM-5-TR. 2022.
NICE — National Institute for Health and Care Excellence. Generalised Anxiety Disorder and Panic Disorder in Adults: Management. CG113, 2011 (updated).
Wolitzky-Taylor 2008 — Wolitzky-Taylor KB et al. Psychological approaches in the treatment of specific phobias: a meta-analysis. Clin Psychol Rev 2008;28(6):1021-37.
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