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Anxiety disorders are the most common category of mental disorders, affecting roughly 30% of adults at some point in their lives. Understanding them means grasping the mechanisms that drive pathological fear and worry, and being able to distinguish between disorders that look similar on the surface but differ in their triggers, cognitive patterns, and behavioral consequences. The DSM-5 reorganized these disorders significantly, so knowing which conditions are still classified as anxiety disorders versus those moved to separate categories (like OCD and PTSD) is essential for exam success.
Each disorder in this guide illustrates core concepts you'll see repeatedly: the fight-or-flight response gone haywire, classical conditioning of fear, cognitive distortions that maintain anxiety, and the role of avoidance behavior in perpetuating symptoms. Don't just memorize symptom lists. Know what psychological mechanism each disorder demonstrates and how they relate to broader theories of anxiety. When you can explain why someone with panic disorder develops agoraphobia or how a specific phobia differs from generalized anxiety, you're thinking like a clinician, and that's exactly what exam questions demand.
These disorders involve anxiety that isn't tied to a specific trigger but instead spreads across multiple life domains. The cognitive hallmark is persistent, excessive worry that the individual struggles to control, often accompanied by physiological hyperarousal.
GAD is defined by excessive worry about multiple life domains (work, health, finances, relationships) that persists for at least six months and feels impossible to control. The worry isn't about one thing; it shifts from topic to topic.
This disorder involves developmentally inappropriate fear of separation from attachment figures, with persistent worry about harm befalling caregivers or being permanently separated from them.
Compare: GAD vs. Separation Anxiety Disorder: both involve persistent, excessive worry, but GAD spreads across multiple domains while separation anxiety focuses specifically on attachment relationships. On an FRQ about developmental considerations in anxiety, separation anxiety is your best example of a disorder with distinct childhood and adult presentations.
These disorders feature sudden, intense surges of fear that peak rapidly. The physiological experience mimics a genuine threat response (racing heart, shortness of breath, trembling) but occurs in the absence of actual danger.
Panic disorder is defined by recurrent, unexpected panic attacks: sudden surges of intense fear that peak within minutes, accompanied by symptoms like heart palpitations, sweating, dizziness, and feelings of impending doom. At least one attack must be followed by a month or more of worry about additional attacks or maladaptive behavioral changes.
Agoraphobia is fear of situations where escape is difficult or help would be unavailable. It is not simply a fear of open spaces, which is one of the most common misconceptions you'll encounter.
Compare: Panic Disorder vs. Agoraphobia: panic disorder centers on the attacks themselves and fear of recurrence, while agoraphobia focuses on avoiding situations. A person can have panic attacks without agoraphobia, or agoraphobia without full panic attacks. Exams often test whether you understand these are now separate diagnoses in DSM-5.
These disorders involve intense fear responses to identifiable stimuli or situations. Classical conditioning and observational learning are primary explanatory mechanisms: fear becomes associated with specific objects or contexts through direct experience, witnessing others' fear, or informational transmission (being told something is dangerous).
A specific phobia involves marked, disproportionate fear of a particular object or situation that almost always provokes immediate anxiety. The DSM-5 groups them into five subtypes: animal, natural environment (heights, storms), blood-injection-injury, situational (elevators, flying), and other.
Social anxiety disorder is defined by fear of negative evaluation in social or performance situations where scrutiny by others is possible. It's distinct from introversion or shyness because of its intensity and the degree of functional impairment it causes.
Compare: Specific Phobia vs. Social Anxiety Disorder: both involve circumscribed fear triggers, but specific phobias target objects or situations while social anxiety targets interpersonal evaluation. Treatment for both emphasizes exposure, but social anxiety also requires cognitive restructuring to address distorted beliefs about others' judgments.
This category captures anxiety that manifests primarily through an inability to speak in certain contexts. The underlying mechanism involves extreme social anxiety that selectively inhibits verbal behavior while leaving other communication channels potentially intact.
Selective mutism is a consistent failure to speak in specific social situations (typically school) despite speaking normally in other settings (typically home). It is not explained by lack of language knowledge or a communication disorder.
Compare: Selective Mutism vs. Social Anxiety Disorder: selective mutism can be conceptualized as social anxiety so severe it inhibits speech entirely in certain contexts. The key distinction is the specific behavioral symptom (not speaking) versus the broader pattern of social avoidance and distress seen in social anxiety disorder.
Important: Under DSM-5, these disorders were moved out of the anxiety disorders category into their own chapter. They share mechanisms with anxiety disorders and are frequently tested alongside them. The distinguishing feature is that a specific traumatic or stressful event is required for diagnosis.
PTSD develops following exposure to actual or threatened death, serious injury, or sexual violence. It requires the presence of symptoms from four distinct clusters:
All four clusters must be present, and symptoms must persist beyond one month. This duration criterion distinguishes PTSD from acute stress disorder and normal post-trauma reactions. The fear conditioning model explains intrusive symptoms, while cognitive models emphasize shattered assumptions about safety and the world. First-line treatments include trauma-focused CBT (including prolonged exposure) and EMDR.
Acute stress disorder has a similar symptom profile to PTSD but occurs between 3 days and 1 month post-trauma. Think of it as a diagnostic window before PTSD can be diagnosed.
Compare: PTSD vs. Acute Stress Disorder: the primary distinction is timing (acute stress disorder = 3 days to 1 month; PTSD = beyond 1 month). Both require trauma exposure and share symptom clusters. If an exam asks about DSM-5 organizational changes, remember these moved to their own category, separate from anxiety disorders.
Important: Like PTSD, OCD was reclassified in DSM-5 into its own chapter. It's included here because exams often test your knowledge of this reorganization and the historical connection to anxiety disorders.
OCD involves two components. Obsessions are intrusive, unwanted thoughts that cause marked anxiety (contamination fears, harm-related thoughts, need for symmetry). Compulsions are repetitive behaviors or mental acts performed to neutralize that anxiety (hand washing, checking, counting, arranging).
Compare: OCD vs. GAD: both involve excessive worry, but OCD features specific intrusive thoughts paired with ritualistic behaviors to neutralize them, while GAD involves diffuse worry without compulsions. This distinction frequently appears on exams testing differential diagnosis skills.
| Concept | Best Examples |
|---|---|
| Pervasive, uncontrollable worry | GAD, Separation Anxiety Disorder |
| Acute fear episodes | Panic Disorder, Agoraphobia |
| Conditioned fear to specific stimuli | Specific Phobias, Social Anxiety Disorder |
| Trauma-related anxiety | PTSD, Acute Stress Disorder |
| Anxiety with compulsive behavior | OCD |
| Communication inhibition from anxiety | Selective Mutism |
| Classical conditioning mechanisms | Specific Phobias, Panic Disorder, PTSD |
| Cognitive distortion emphasis | GAD, Social Anxiety Disorder, OCD |
Which two disorders were removed from the anxiety disorders category in DSM-5, and what do they have in common that justified their new classifications?
Compare and contrast panic disorder and agoraphobia. How did DSM-5 change their relationship, and why might someone have one without the other?
A patient reports excessive worry about multiple areas of life, muscle tension, and difficulty sleeping. Another patient reports intrusive thoughts about contamination and washes their hands 50 times daily. What distinguishes these presentations, and which disorders do they represent?
How does the fear conditioning model explain symptom development differently in specific phobias versus PTSD? What role does avoidance play in maintaining both disorders?
If an FRQ asks you to explain why separation anxiety disorder and selective mutism are both relevant to understanding anxiety across the lifespan, what developmental considerations would you emphasize in your response?