Anxiety Disorder

Anxiety is a universal human experience. It is the mind and body's response to uncertainty, threat, or challenge -- and in appropriate doses, it is adaptive. The anxiety that sharpens focus before a presentation, or the alertness that keeps us safe in genuinely dangerous situations, serves an important function.

An anxiety disorder is different. It is characterised by anxiety that is persistent, excessive, and disproportionate to the actual circumstances -- anxiety that does not resolve when the stressor passes, that is difficult or impossible to control through reasoning, and that interferes significantly with daily life. Anxiety disorders are among the most prevalent mental health conditions globally, and in Singapore, they are among the most common reasons people seek psychiatric care.

Types of Anxiety Disorder

Anxiety is not a single condition. The DSM-5 and ICD-11 (the primary diagnostic frameworks used in clinical psychiatry) classify several distinct anxiety disorders, each with its own features, triggers, and evidence base for treatment. Understanding which type a patient has guides the most effective treatment approach.

Generalised Anxiety Disorder (GAD)

Core Feature: Persistent, excessive worry about multiple aspects of everyday life -- health, finances, work, relationships -- that is disproportionate to actual circumstances and difficult to control.

Signs and Symptoms: Restlessness, fatigue, difficulty concentrating, irritability, muscle tension, sleep disturbance. Worry is present on more days than not for at least 6 months.

Panic Disorder

Core Feature: Recurrent unexpected panic attacks -- sudden surges of intense fear reaching a peak within minutes -- along with persistent worry about future attacks or avoidance of situations associated with them.

Signs and Symptoms: During a panic attack: racing heart, chest tightness, breathlessness, dizziness, sweating, trembling, tingling, nausea, a sense of unreality (derealization), or fear of losing control or dying. Attacks peak within 10 minutes.

Social Anxiety Disorder

Core Feature: Intense, persistent fear of social or performance situations in which scrutiny or negative evaluation by others is possible. The fear is recognised as excessive but cannot be controlled.

Signs and Symptoms: Anticipatory anxiety before social events, physical symptoms in social situations (blushing, sweating, trembling, blanking), avoidance of social situations, or endurance with significant distress. Affects work, study, and relationships.

Specific Phobias

Core Feature: Intense, irrational fear of a specific object, animal, or situation that poses little or no real danger. The fear response is immediate, excessive, and leads to avoidance.

Signs and Symptoms: Common phobias include: blood/injection/injury phobia, animal phobias (spiders, dogs, insects), situational phobias (enclosed spaces, heights, flying), and natural environment phobias (storms, water). Even anticipating the trigger causes anxiety.

Agoraphobia

Core Feature: Fear and avoidance of situations where escape might be difficult or help unavailable in the event of panic-like symptoms. Commonly includes public transport, open spaces, crowds, or being outside the home alone.

Signs and Symptoms: Avoidance of feared situations, or endurance only with a companion. In severe cases, may become housebound. Often develops secondary to panic disorder.

Separation Anxiety Disorder

Core Feature: Excessive fear or anxiety about separation from attachment figures, beyond what is developmentally appropriate. Can affect children and adults.

Signs and Symptoms: In children: distress at separation from parents, worry about harm coming to attachment figures, nightmares about separation, physical symptoms on school days. In adults: anxiety about leaving home, excessive concern about a partner or parent's safety.

Symptoms of Anxiety Disorder?

Anxiety disorders produce a wide range of symptoms -- psychological, cognitive, behavioural, and physical. The physical symptoms of anxiety are frequently attributed to medical conditions, leading to unnecessary investigations and delayed psychiatric diagnosis.

Psychological and emotional symptoms

• Persistent, excessive worry that is difficult to control
• A sense of dread, impending doom, or that something bad is about to happen
• Feeling on edge, restless, or keyed up
• Irritability: Lower threshold for frustration than usual
• Feeling overwhelmed or unable to cope
• Low mood alongside anxiety: Depression and anxiety commonly co-occur

Cognitive symptoms

• Difficulty concentrating: Mind going blank or focus interrupted by worry
• Racing thoughts: The mind moving rapidly between concerns
• Negative thinking patterns: Overestimating the likelihood of bad outcomes
• Catastrophising: Assuming the worst-case scenario
• Difficulty making decisions

Behavioural symptoms

• Avoidance: Staying away from situations, people, or activities that trigger anxiety
• Seeking reassurance: Repeatedly asking others for confirmation that things will be okay
• Procrastination driven by anxiety rather than laziness
• Withdrawing from social activities or relationships
• Increased use of alcohol or substances to manage anxiety

Physical symptoms

Physical symptoms of anxiety are among the most commonly misattributed. Many patients have extensive cardiac, gastrointestinal, or respiratory investigations before anxiety is identified as the primary cause.

• Muscle tension: Particularly in the neck, shoulders, and jaw
• Fatigue: Persistent tiredness not explained by physical illness
• Sleep disturbance: Difficulty falling asleep, staying asleep, or restless sleep with anxious dreams
• Headaches: Often tension-type, from chronic muscle tension
• Gastrointestinal symptoms: Nausea, stomach aches, irritable bowel, diarrhoea with anxiety
• Cardiovascular symptoms: Palpitations, racing heart, chest tightness (most prominent in panic disorder)
• Respiratory symptoms: Shortness of breath, feeling unable to take a deep breath, hyperventilation
• Sweating, trembling, and tingling: Particularly in panic attacks
• Dizziness and lightheadedness

The Anxiety-Depression Connection

Anxiety and depression are distinct conditions, but they frequently co-occur. It is estimated that more than 50% of people diagnosed with depression also meet criteria for an anxiety disorder, and vice versa. The relationship is bidirectional: anxiety increases the risk of developing depression, and depression increases the risk of developing or worsening anxiety.

In clinical practice, anxiety often presents first -- particularly in younger patients -- with depression developing subsequently, especially if the anxiety is undertreated. The comorbid presentation is associated with greater severity, longer duration, and higher functional impairment than either condition alone.

When both conditions are present, treatment must address both. SSRIs and SNRIs are effective for both anxiety and depression, and CBT protocols exist for comorbid presentations. This is one reason why a thorough psychiatric assessment -- rather than self-diagnosis -- is important: the treatment approach depends on the complete clinical picture.

Causes and Contributing Factors

Anxiety disorders arise from a complex interaction of biological, psychological, and environmental factors. No single cause determines whether someone develops an anxiety disorder, and having risk factors does not mean an anxiety disorder is inevitable.

Biological factors

• Genetics: Anxiety disorders run in families. Having a first-degree relative with an anxiety disorder increases risk, though the genes involved are not fully identified
• Brain chemistry: Imbalances in neurotransmitter systems (serotonin, noradrenaline, GABA) are implicated in the development of anxiety disorders
• Temperament: A more anxious or inhibited temperament from childhood is associated with higher lifetime risk
• Medical conditions: Thyroid disorders, cardiac arrhythmias, and certain medications can produce anxiety symptoms

Psychological and Experimental Factors

• Childhood adversity: Trauma, abuse, neglect, or witnessing traumatic events in childhood significantly increases lifetime anxiety risk
• Learned anxiety responses: Anxiety can be learned through conditioning (associating a neutral situation with fear), modelling (observing anxious behaviour in caregivers), or information transmission (being told situations are dangerous)
• Cognitive patterns: Habitual negative thinking styles (catastrophising, overestimating risk, underestimating coping ability) maintain and worsen anxiety

Psychological and Experimental Factors

• Significant life stressors: Job loss, relationship breakdown, bereavement, financial stress, health diagnosis
• Chronic stress: Prolonged exposure to stressors without adequate recovery
• Major life transitions: Migration, retirement, parenthood, academic pressure
• Substance use: Caffeine, alcohol, and many drugs can produce or worsen anxiety; anxiety from alcohol withdrawal can be severe

How Anxiety Disorders are Diagnosed

There is no blood test or brain scan that diagnoses an anxiety disorder. Diagnosis is a clinical process based on a thorough assessment by a trained mental health professional -- a psychiatrist or clinical psychologist.

Psychiatric or Psychological Assessment

A comprehensive assessment covers

• The nature, frequency, intensity, and duration of anxiety symptoms
• The impact of anxiety on work, relationships, sleep, and daily activities
• Triggers, patterns, and situations that worsen or improve anxiety
• The presence of avoidance behaviour
• Physical symptoms and prior medical investigations
• Alcohol and substance use
• Family and personal psychiatric history
• Life history -- significant events, childhood experiences, current stressors
• Current mental state -- mood, concentration, sleep, suicidal ideation if relevant

Medical Assessment to Exclude Physical Causes

Anxiety symptoms -- particularly palpitations, chest tightness, breathlessness, and tremor -- can be caused by or worsen with medical conditions. A physical examination and targeted investigations (thyroid function tests, ECG, blood glucose, full blood count) help exclude medical contributors to anxiety symptoms before or alongside psychiatric assessment.

Supporting Someone with an Anxiety Disorder

If someone close to you has an anxiety disorder, understanding what is and is not helpful can make a significant difference to their recovery.

Helpful Responses

• Listen without minimising: Avoid 'just relax' or 'there is nothing to worry about'. These are dismissive even when well-intentioned.
• Offer practical support: Accompany them to appointments, help with tasks that feel overwhelming
• Encourage treatment: Gently encourage seeking professional help without pressure
• Educate yourself: Understanding anxiety disorders reduces frustration and helps you respond more supportively
• Look after your own wellbeing: Supporting someone with a mental health condition is demanding. Your own mental health matters too.

Avoid

• Enabling avoidance: Repeatedly reassuring someone or helping them avoid feared situations maintains the anxiety rather than helping them overcome it
• Taking over tasks they are capable of: Reducing their independence worsens anxiety long-term
• Expressing frustration with their pace of improvement: Anxiety disorders take time to treat

Treatment Options for Anxiety Disorders

Anxiety disorders are among the most treatable mental health conditions. The evidence base for treatment is extensive and consistent: psychotherapy and medication -- used together or separately depending on the severity, type, and patient preference -- produce significant improvement in the majority of patients.

• Cognitive Behavioural Therapy (CBT): The gold-standard psychotherapy for anxiety disorders. CBT addresses the relationship between thoughts, feelings, and behaviours that maintain anxiety. Core components include: identifying and challenging distorted thinking patterns (cognitive restructuring), graduated exposure to feared situations (behavioural component), and developing coping skills. Typically 8-20 sessions. Highly effective for GAD, panic disorder, social anxiety, and phobias. Effects are durable -- patients retain skills after treatment ends.
• Exposure Therapy: A key component of CBT, exposure involves systematic, graduated confrontation with feared objects, situations, or thoughts -- in a safe, controlled context -- to break the avoidance cycle that maintains anxiety. For specific phobias, exposure therapy alone is highly effective and can produce significant results in a small number of sessions. Imaginal exposure (confronting feared scenarios mentally) and in vivo exposure (confronting real situations) are both used.
• Medications: Selective serotonin reuptake inhibitors (SSRIs: sertraline, escitalopram, paroxetine) and serotonin-norepinephrine reuptake inhibitors (SNRIs: venlafaxine, duloxetine) are first-line pharmacological treatments for most anxiety disorders. They are not addictive, work gradually over 4-8 weeks, and are well tolerated by most patients. Typically prescribed for 6-12 months minimum. Effective for GAD, panic disorder, social anxiety disorder, and as adjuncts in other anxiety conditions.
• Mindfulness-Based Approaches: Mindfulness-Based Cognitive Therapy (MBCT) and Mindfulness-Based Stress Reduction (MBSR) have good evidence for anxiety, particularly in preventing relapse after an anxiety episode. Mindfulness trains attention toward the present moment, reducing the ruminative and anticipatory thinking that drives anxiety. Most effective as an adjunct to CBT or medication, or for maintenance after recovery.
• Lifestyle and Self-Management: Regular aerobic exercise has a well-established anxiolytic effect comparable to medication in some studies -- 150 minutes per week of moderate intensity activity. Sleep hygiene is critically important as sleep deprivation significantly worsens anxiety. Reducing caffeine intake reduces physiological arousal. Mindfulness practice, breathing exercises (diaphragmatic breathing, box breathing), and relaxation techniques (progressive muscle relaxation) are useful self-management tools alongside professional treatment.