4.2 Anxiety, Trauma-Related & Somatic Symptom Disorders

Clinical Overview of Anxiety, Trauma, and Somatosensory Spectrum Disorders

Anxiety, trauma-related, and somatic symptom disorders represent a frequent reason for medical evaluation across primary care and emergency settings. Patients frequently present with prominent physical complaints—such as palpitations, dyspnea, chest tightness, or unexplainable neurological deficits—that require systematic medical workup before establishing a psychiatric diagnosis. USMLE Step 2 CK questions emphasize distinguishing these conditions based on symptom duration, trauma exposure history, and whether symptoms are intentionally produced.

Generalized Anxiety Disorder & Panic Disorder Criteria

• Generalized Anxiety Disorder (GAD): Characterized by excessive, uncontrollable worry about multiple everyday issues (e.g., finances, health, family, work) for ≥6 months. The anxiety must be associated with ≥3 of the following 6 symptoms in adults (only 1 required in children):
  1. Restlessness or feeling keyed up/on edge
  2. Easy fatigability
  3. Difficulty concentrating or mind going blank
  4. Irritability
  5. Muscle tension
  6. Sleep disturbance (difficulty falling/staying asleep or restless sleep)
• Panic Disorder: Defined by recurrent, unexpected panic attacks that reach a peak within minutes. At least one attack must be followed by ≥1 month of persistent concern or worry about having additional attacks, or a significant maladaptive change in behavior related to the attacks (e.g., avoiding exercise or unfamiliar locations). Panic attacks involve abrupt surges of intense fear accompanied by at least 4 of 13 somatic/cognitive symptoms (palpitations, sweating, trembling, shortness of breath, chest pain, nausea, dizziness, chills/heat, paresthesias, derealization/depersonalization, fear of losing control, fear of dying).

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Diagnostic & Screening Algorithm for Anxiety and Somatic Symptoms

Diagnostic Decision Tree for Anxiety, Trauma, and Somatic Presentations:
1. Symptoms tied to discrete, catastrophic traumatic event?
   - Duration 3 days to 1 month -> Acute Stress Disorder (ASD).
   - Duration >1 month with intrusive memories, avoidance, negative mood, hyperarousal -> Post-Traumatic Stress Disorder (PTSD).
2. Unexplained physical/somatic symptoms or health anxiety?
   - Prominent physical symptom(s) causing excessive thoughts/feelings/behaviors >6 months -> Somatic Symptom Disorder.
   - Preoccupation with having a serious illness with minimal/no physical symptoms >6 months -> Illness Anxiety Disorder.
   - Sudden neurological deficit (e.g., blindness, paralysis) incompatible with neuroanatomy, often following stress -> Conversion Disorder.
   - Intentional production of symptoms for primary internal gain (sick role) -> Factitious Disorder.
   - Intentional production of symptoms for secondary external gain (disability, financial, legal) -> Malingering.
3. Spontaneous recurrent panic attacks with persistent fear of future attacks for ≥1 month -> Panic Disorder.
4. Excessive worry across multiple domains for ≥6 months + ≥3 somatic symptoms -> Generalized Anxiety Disorder.

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Comparative Analysis of Trauma & Stressor-Related Disorders

Trauma exposure can result in distinct clinical syndromes based on duration and symptom clusters.

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Somatic Symptom and Related Disorders Spectrum

Somatic spectrum disorders involve physical symptoms or health preoccupations that cause severe distress. Medical workup must be judicious to avoid unnecessary invasive testing while building a strong therapeutic alliance.

• Somatic Symptom Disorder: Characterized by ≥1 somatic symptom (e.g., chronic pain, fatigue, GI distress) that is distressing or disrupts daily life, accompanied by excessive thoughts, feelings, or behaviors related to the symptoms (persistent high anxiety, excessive time/energy devoted to health concerns). Symptoms must persist for >6 months. The physical symptom may or may not have an identified medical cause; the diagnosis is based on the abnormal psychological reaction to the symptom.
• Illness Anxiety Disorder: Preoccupation with having or acquiring a serious, undiagnosed medical illness. Physical symptoms are absent or minimal. The individual performs excessive health-related behaviors (e.g., repeatedly checking body for signs of illness) or exhibits maladaptive avoidance (e.g., avoiding doctor appointments).
• Conversion Disorder (Functional Neurological Symptom Disorder): Neurological symptoms (e.g., sudden onset weakness, paralysis, blindness, non-epileptic seizures, aphonia) that demonstrate clinical incompatibility with recognized neuroanatomical pathways (e.g., Hoover sign positive for functional weakness, normal EEG during non-epileptic seizure). Symptoms are not intentionally produced and often follow acute psychological stress.
• Factitious Disorder: Intentional falsification of physical or psychological signs or induction of injury/disease (e.g., contaminating urine samples, self-injecting insulin) associated with identified deception. The motivation is to assume the sick role (primary internal gain). Can be imposed on self or on another (Factitious Disorder Imposed on Another / Munchausen syndrome by proxy).
• Malingering: Intentional production or exaggeration of false physical or psychological symptoms motivated by external incentives (secondary external gain), such as obtaining disability payments, avoiding military duty, escaping criminal prosecution, or obtaining prescription drugs. Malingering is a clinical behavior, not a DSM-5 psychiatric disorder.

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Evidence-Based Psychopharmacotherapy & Psychotherapy

Pharmacologic Protocols

• SSRIs and SNRIs: First-line pharmacotherapy for GAD, Panic Disorder, Social Anxiety Disorder, and PTSD. Dose initiation should be at half the starting dose used for depression to prevent initial anxiogenic side effects.
• Benzodiazepines (e.g., Alprazolam, Clonazepam, Lorazepam): Rapid-acting GABA-A receptor modulators. Indicated only for short-term acute stabilization of severe panic or agitation. Long-term use is limited by tolerance, physical dependence, cognitive impairment, fall risk in elderly, and severe withdrawal seizures.
• Buspirone: Non-benzodiazepine 5-HT1A receptor partial agonist. Effective for GAD. Lacks sedating, muscle relaxant, or addictive properties, but requires 2–4 weeks of continuous use to achieve therapeutic benefit. Ineffective for acute panic attacks.
• Alpha-1 Blockers (Prazosin): Centrally acting alpha-1 adrenergic antagonist that reduces sympathetic overactivation, specifically indicated to treat PTSD-associated nightmares and sleep disruption.
• Beta-Blockers (Propranolol): Centrally and peripherally acting beta-blocker taken 30–60 minutes prior to public speaking or performance to control autonomic arousal (tachycardia, tremor) in performance-only Social Anxiety Disorder.

Cognitive Behavioral Therapy & Exposure Modalities

• Cognitive Behavioral Therapy (CBT): First-line psychotherapeutic treatment across all anxiety, trauma, and somatic disorders. Focuses on cognitive restructuring (identifying catastrophizing thoughts) and behavioral experiments.
• Prolonged Exposure & EMDR: Trauma-focused CBT protocols that facilitate emotional processing of traumatic memories in PTSD.
• Primary Care Management of Somatic Symptom Disorder: The most effective intervention is establishing regularly scheduled brief appointments with a single primary care physician, performing focused physical exams, avoiding unnecessary diagnostic workups, and gradually introducing CBT.