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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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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