Panic Disorder — Causes, Symptoms & Treatment Guide — Symptoms, Causes & Treatment | MyMedicPlus

Panic disorder is a common anxiety disorder characterised by recurrent, unexpected panic attacks — sudden episodes of intense fear accompanied by intense physical and psychological symptoms — along with persistent concern about future attacks and significant maladaptive behavioural changes such as avoidance. A panic attack is defined as a discrete period of abrupt-onset intense fear or discomfort reaching a peak within minutes, accompanied by at least 4 of 13 specific somatic and cognitive symptoms. Panic disorder differs from isolated panic attacks (which are common and non-pathological) in that the attacks are recurrent, unexpected, and cause significant ongoing distress or functional impairment. Panic disorder affects 2-3% of adults over a lifetime, with a 2:1 female predominance. Without treatment, panic disorder is typically chronic and disabling. With appropriate treatment (CBT and/or medication), 70-90% of patients achieve significant improvement or remission.

Panic disorder is multifactorial, with biological, psychological, and environmental contributors. Biological factors: genetic predisposition — heritability approximately 40%; dysfunction in fear circuitry involving the amygdala, locus coeruleus, and prefrontal cortex; dysregulation of the noradrenergic, serotonergic, and GABA systems. The 'false alarm' theory proposes panic attacks represent misfired normal fear responses. Hypersensitivity to bodily sensations (interoceptive hyperawareness) is a core cognitive vulnerability. Risk factors: female sex, family history of anxiety or panic disorder, childhood adversity and trauma, neuroticism and anxiety sensitivity (tendency to catastrophise physical sensations), stressful life events precipitating initial attacks (illness, bereavement, occupational stress), major life transitions (pregnancy, parenthood), comorbid depression and other anxiety disorders (present in 50-60%), and substance misuse (alcohol dependence commonly develops as self-medication).

Panic attacks: sudden intense fear or discomfort peaking within minutes, with at least 4 of: palpitations/racing heart, sweating, trembling/shaking, shortness of breath or smothering sensation, choking feeling, chest pain/discomfort, nausea/abdominal distress, dizziness/lightheadedness/pre-syncope, chills or hot flushes, paraesthesia (numbness/tingling, especially perioral and hands), derealisation (feelings of unreality) or depersonalisation (detachment from self), fear of losing control or 'going crazy', and fear of dying (most commonly of a heart attack). Attacks typically last 10-20 minutes and resolve spontaneously. Diagnostic criteria (DSM-5) require: recurrent unexpected panic attacks, at least one month of anticipatory anxiety (worry about future attacks or their consequences) or significant maladaptive behavioural changes (avoiding physical exertion, unfamiliar situations — agoraphobia). Agoraphobia (avoidance of situations where escape might be difficult during a panic attack) develops in 30-50%: avoidance of public transport, crowds, shops, being outside alone, or enclosed spaces.

Panic disorder is a clinical diagnosis based on DSM-5 or ICD-11 criteria — history of recurrent, unexpected panic attacks with anticipatory anxiety or avoidance. Medical causes of panic-like symptoms must be excluded: thyroid function tests (hyperthyroidism), full blood count (anaemia), blood glucose (hypoglycaemia), ECG (arrhythmia — paroxysmal SVT, Wolff-Parkinson-White), and urine drug screen (stimulant intoxication, cannabis, cocaine). 24-hour Holter monitoring if palpitations are the dominant symptom. 24-hour urinary catecholamines or plasma metanephrines to exclude phaeochromocytoma if hypertension accompanies attacks. Validated assessment tools: Panic Disorder Severity Scale (PDSS), Beck Anxiety Inventory (BAI). Agoraphobia and comorbid conditions (depression, other anxiety disorders, PTSD) must be assessed. Cardiac, respiratory, neurological, and endocrine conditions are the most common medical mimics of panic disorder.

Cognitive-Behavioural Therapy (CBT) is the gold standard psychological treatment — 12-16 weekly sessions. Core CBT techniques: psychoeducation (understanding the physical basis of panic, normalising symptoms), cognitive restructuring (challenging catastrophic misinterpretation of bodily sensations), interoceptive exposure (deliberate induction of feared bodily sensations to break the fear-sensation cycle), and situational exposure (graded exposure to avoided situations to treat agoraphobia). CBT achieves panic-free status in 70-90% of patients. Pharmacotherapy: SSRIs (sertraline 50-200mg, paroxetine 20-60mg, escitalopram 10-20mg, fluoxetine 20-60mg) or SNRIs (venlafaxine 75-225mg) are first-line — begin at low doses (risk of initial anxiety activation) and titrate over 2-4 weeks; full response takes 4-8 weeks; treatment for minimum 12 months to prevent relapse. Benzodiazepines (clonazepam, alprazolam): rapid relief of acute panic — NOT first-line for long-term treatment due to dependence risk; short-term use only (maximum 4 weeks) as bridging therapy during SSRI initiation; avoid in patients with substance use history. Combination CBT + SSRI is more effective than either alone for severe or comorbid cases. Intensive one-day CBT, online CBT-based programmes, and app-based interventions (Headspace, Calm, Anxiety Coach) provide accessible alternatives.

Untreated panic disorder carries substantial complications. Agoraphobia develops in 30–50% of people with persistent panic disorder — progressive avoidance of situations where escape might be difficult eventually leaves some patients housebound, severely restricting independence and quality of life. Major depressive disorder is comorbid in up to 65% of patients with panic disorder, significantly worsening prognosis and requiring combined treatment. Alcohol and substance use disorders develop in 20–30% as self-medication — alcohol's short-term anxiolytic effect creates dependency while paradoxically worsening panic frequency over time. Social and occupational impairment from avoidance behaviours affects relationships, career advancement, and education. Some population-based studies show a 2–3 fold increase in cardiac events in individuals with panic disorder — possibly from chronic autonomic dysregulation. Early treatment with CBT is the single most important intervention to prevent agoraphobia from developing, which is the most disabling long-term complication of untreated panic disorder.

Regular aerobic exercise (30 minutes 3-5x per week) reduces anxiety severity and panic frequency — reduces amygdala reactivity and increases BDNF. Diaphragmatic breathing practice — slow, controlled breathing (4-second inhale, 4-second hold, 6-second exhale) — blunts the hyperventilation-anxiety spiral. Reduce caffeine and alcohol — both lower the panic threshold. Mindfulness-based stress reduction (MBSR) — 8-week course — significantly reduces anxiety and panic recurrence. Maintain regular sleep schedule — sleep deprivation lowers panic threshold significantly. Psychoeducation: understanding the physiology of panic attacks (harmless physiological alarm response) reduces catastrophising. Avoid escape behaviours and safety behaviours during panic attacks (escape maintains avoidance). Develop a personal relapse prevention plan with identifying warning signs and early intervention strategies.

Seek emergency assessment for: first-ever severe chest pain, palpitations, or breathlessness — to exclude cardiac and other medical causes before attributing to panic disorder. See your GP if you have experienced two or more unexpected panic attacks that were followed by ongoing worry about future attacks, or if you have started avoiding situations due to fear of panic attacks. Do not attempt to self-diagnose panic disorder — many serious medical conditions can mimic panic attacks. See a psychiatrist or psychologist urgently if panic disorder is causing significant functional impairment, you are unable to work or leave your home, or you have thoughts of suicide or self-harm (panic disorder carries elevated suicide risk, particularly with comorbid depression). Early diagnosis and treatment prevents the development of agoraphobia and secondary depression.