Normal fear stuck in the on position. Learn the clock that dates each disorder, the OCD versus OCPD split, and why the answer is almost always an SSRI plus the right therapy.
The Setup
Fear Stuck On
Anxiety disorders are normal fear that fires too often and will not switch off. Tell them apart by what the fear attaches to and how long it has lasted.
A 29-year-old woman describes worrying about nearly everything: her job, her health, her finances, her family. The worry is hard to control and shows up most days. She also feels restless, tense, and tired, sleeps poorly, and cannot concentrate. This has gone on for about 8 months. Her thyroid studies and exam are normal.
Which feature most secures the diagnosis of generalized anxiety disorder?
Anxiety disorders are normal fear stuck in the on position. The brain has a smoke detector (the amygdala) that fires fear when it senses threat. In anxiety disorders that alarm fires too often, too long, or at the wrong things, and it stops switching off. The job in clinical practice is to tell the disorders apart by what the fear attaches to and how long it has lasted.
Time is half the diagnosis. Most of these disorders carry a duration threshold, and the threshold is the favorite test point. Generalized anxiety, social anxiety, agoraphobia, and specific phobia all require at least 6 months. Panic disorder requires at least 1 month of worry about the attacks. Get the clock right and the rest follows.
Sort by what the fear is about. Flip each card.
Free-floating worryTap to flip
Generalized anxietyWorry about many things at once (work, health, money, family), most days for at least 6 months, with restlessness, fatigue, irritability, muscle tension, poor sleep, and trouble concentrating.
Sudden surgesTap to flip
Panic disorderRecurrent unexpected panic attacks that peak within minutes, plus at least 1 month of worrying about the next attack or changing behavior to avoid one.
Fear of scrutinyTap to flip
Social anxietyIntense fear of being judged or embarrassed in social or performance settings, lasting at least 6 months. A performance-only subtype exists (for example, public speaking).
The Disorders
What the Fear Points At
Each disorder pins the fear to a different target. The duration thresholds are a high-yield question on their own.
Each disorder pins the fear to a different target. Tap each one to see the defining feature and its first-line treatment.
Generalized anxiety disorder
Tap to reveal
Excessive, hard-to-control worry about multiple areas, most days for at least 6 months, with somatic symptoms (tension, fatigue, poor sleep). First-line: an SSRI or SNRI plus cognitive behavioral therapy.
Panic disorder
Tap to reveal
Recurrent unexpected panic attacks that peak in minutes (palpitations, shortness of breath, chest pain, choking, derealization, fear of dying), plus at least 1 month of worry about more attacks. First-line: an SSRI plus CBT; a benzodiazepine only as a short bridge.
Agoraphobia
Tap to reveal
Marked fear of at least two situations where escape feels hard: public transit, open spaces, enclosed spaces, crowds, or being outside the home alone. Lasts at least 6 months. Often follows panic disorder.
Specific phobia
Tap to reveal
Marked, out-of-proportion fear of a specific object or situation (heights, blood, flying, animals), with avoidance, for at least 6 months. First-line: cognitive behavioral therapy with graded exposure, not medication.
Social anxiety disorder
Tap to reveal
Fear of scrutiny and humiliation in social or performance settings for at least 6 months. First-line: SSRI or SNRI plus CBT. For performance-only anxiety, a beta-blocker or short-acting benzodiazepine taken before the event.
Panic attack vs panic disorder
Tap to reveal
A panic attack is a symptom that can occur in many conditions. Panic disorder requires that the attacks be recurrent and unexpected, plus persistent worry about them. One attack is not the disorder.
The duration thresholds, side by side. This table is a frequent single-best-answer question by itself.
Disorder
Duration threshold
Generalized anxiety disorder
At least 6 months of worry
Social anxiety disorder
At least 6 months
Specific phobia
At least 6 months
Agoraphobia
At least 6 months
Panic disorder
At least 1 month of worry about attacks
Obsessive-compulsive disorder
Time-consuming (more than 1 hour per day) or marked distress
Confirming It
Obsessions, Compulsions, and the Look-Alikes
OCD is an unwanted loop the patient resents. OCPD is a personality the patient endorses. That ego-dystonic versus ego-syntonic split is the favorite trap.
Obsessions feed compulsions. An obsession is an intrusive, unwanted thought (contamination, harm, symmetry) that spikes anxiety. A compulsion is a repetitive act (washing, checking, counting, ordering) done to neutralize that anxiety. The relief is brief, so the loop repeats and eats time. The defining feature is that the patient finds the thoughts distressing and senseless. Work the discriminators.
A patient washes her hands until they crack because intrusive thoughts of contamination terrify her. She knows the fear is excessive and hates it. Which best describes this?
Obsessive-compulsive disorder. The thoughts are intrusive and unwanted (ego-dystonic), and the behaviors are compulsions done to relieve them. She knows it is irrational and is distressed by it. True obsessions and compulsions that the patient resents point to OCD.
A different man is rigid, perfectionistic, and preoccupied with rules and lists. He sees nothing wrong with it and thinks everyone else is sloppy. Which is this?
Obsessive-compulsive personality disorder. It is a personality style (ego-syntonic): the person is comfortable with their rigidity and lacks true obsessions and compulsions. No intrusive thoughts, no neutralizing rituals. OCPD is a personality trait the patient endorses; OCD is an unwanted, distressing loop.
What is the most effective psychotherapy specifically for OCD?
Exposure and response prevention (ERP), a form of CBT. The patient is exposed to the trigger and coached to resist the compulsion, which breaks the relief loop over time. Pair it with an SSRI. ERP is the signature behavioral treatment for OCD.
OCD travels with a family of related conditions. Flip each card.
OCD vs OCPDTap to flip
The classic splitOCD is ego-dystonic: unwanted obsessions and compulsions that distress the patient. OCPD is ego-syntonic: a rigid, perfectionistic personality the patient is fine with. Different category, different treatment.
Body dysmorphic disorderTap to flip
Perceived defectPreoccupation with a flaw in appearance that others barely notice, plus repetitive behaviors like mirror checking. Treated with an SSRI and CBT. Do not give cosmetic surgery; it does not help.
Hoarding, hair-pulling, skin-pickingTap to flip
OCD-related disordersHoarding disorder (cannot discard possessions), trichotillomania (pulling out one's own hair), and excoriation (compulsive skin-picking) sit in the OCD-related family. CBT is central; SSRIs may help.
The Plan
SSRIs and the Exceptions
First-line is almost always an SSRI plus the right therapy. Know the exceptions: exposure for phobia, a beta-blocker for performance anxiety, and no chronic benzodiazepines.
First-line medication is almost always an SSRI. For generalized anxiety, panic, social anxiety, OCD, and the OCD-related disorders, a selective serotonin reuptake inhibitor (SSRI) is the medication of choice, usually paired with CBT. SNRIs (such as venlafaxine or duloxetine) are strong alternatives. OCD often needs higher doses and a longer trial than depression before it responds.
Know the exceptions to the SSRI default. Specific phobia is treated first with exposure therapy, not a pill. Performance-only social anxiety is handled with a beta-blocker (for example, propranolol) or a short-acting benzodiazepine before the event. Buspirone is a non-sedating, non-addictive add-on for generalized anxiety, but it is slow and does not work for panic.
Situation
First-line treatment
Generalized anxiety disorder
SSRI or SNRI plus CBT; buspirone as an adjunct
Panic disorder
SSRI plus CBT; benzodiazepine only as a short bridge
Social anxiety (generalized)
SSRI or SNRI plus CBT
Social anxiety (performance only)
Beta-blocker or benzodiazepine before the event
Specific phobia
CBT with graded exposure (first-line, not medication)
OCD
SSRI at higher doses plus ERP; clomipramine second-line
From the AttendingSSRIs take 4 to 6 weeks to work, and they can make anxiety feel worse in the first week or two (jitteriness, activation). Tell the patient that up front, start low, and go slow, or they will quit on day three convinced it backfired. Set the expectation: better in weeks, possibly bumpier first.
Board TrapDo not park an anxious patient on chronic benzodiazepines. They work fast, which is the trap, but they cause tolerance, dependence, and rebound anxiety, and they are risky with alcohol or opioids. Use them only as a short bridge while the SSRI takes hold. For OCD specifically, a benzodiazepine does little; the answer is an SSRI plus ERP.
Prove It
Board Walkthrough
Original clinical vignettes, 5 dealt per round, answer choices shuffled, never repeating within a round. Tap a wrong answer first to see why it almost works, then read the glowing clues.
Medically reviewed by Fatima Ali, DO and Kaitlyn Cocuzzo, MD · Last reviewed June 2026
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