Anxiety Disorders

Anxiety disorders are the most common group of mental disorders, defined by excessive, persistent fear or worry that is out of proportion to actual threat and impairs daily functioning. They include generalised anxiety disorder, panic disorder, social anxiety disorder, and specific phobias, and are a frequent presentation across mental health and general nursing settings.

Definition

Anxiety disorders are a group of conditions characterised by excessive fear (the response to a perceived imminent threat) and anxiety (anticipation of future threat), with associated behavioural disturbances, that are persistent, disproportionate to the situation, and cause clinically significant distress or impairment.

Scope

This topic covers the shared features of the anxiety disorders, the main diagnostic categories, the distinction between adaptive fear and pathological anxiety, epidemiology, explanatory models, and relevance to nursing care. It is reference-educational and does not provide dosing or individualised treatment instructions.

Core questions

• How does pathological anxiety differ from normal, adaptive fear?
• What features distinguish the main anxiety disorders from one another?
• Why are anxiety disorders so frequently comorbid with depression?
• What roles do avoidance and safety behaviours play in maintaining anxiety?

Key concepts

• Fear versus anxiety
• Generalised anxiety disorder
• Panic disorder and panic attacks
• Social anxiety disorder
• Specific phobia
• Avoidance and safety behaviours
• Anticipatory anxiety
• Comorbidity with depression

Key theories

Fear-conditioning and avoidance model

Frames anxiety disorders in terms of learned fear responses and the negative reinforcement of avoidance, which provides short-term relief but maintains the disorder over time; this underpins exposure-based psychological treatment.

Threat-system dysregulation

Proposes that anxiety disorders involve heightened reactivity of brain fear circuits (notably amygdala-prefrontal systems) interacting with temperamental and genetic vulnerability.

Mechanisms

Anxiety disorders are understood to arise from the interaction of temperamental and genetic vulnerability with environmental experiences, expressed through heightened activity of brain fear and threat-appraisal circuits and reinforced behaviourally by avoidance. No single mechanism defines the group; the combination of biological reactivity and learned avoidance helps explain why exposure-based psychological approaches and certain pharmacological treatments are used in care.

Clinical relevance

Anxiety disorders are among the conditions nurses encounter most often, both as primary presentations and alongside physical illness and other psychiatric disorders, where recognising anxiety, providing reassurance and psychoeducation, and supporting engagement with evidence-based treatment are central. This entry describes the disorder group for orientation and is not a basis for individual diagnostic or treatment decisions.

Epidemiology

Anxiety disorders are the most prevalent class of mental disorders, affecting a large proportion of people over their lifetime, with onset often in childhood or adolescence, a female predominance, and frequent comorbidity with depressive and substance use disorders. They are consistently ranked among the leading global contributors to years lived with disability.

Evidence & guidelines

Diagnosis follows the DSM-5-TR and ICD-11 (anxiety or fear-related disorders, block 6B0Z); burden estimates come from the Global Burden of Disease programme; and management of specific disorders is addressed in guidelines such as NICE CG113. Pharmacological and psychotherapy detail belongs in those guidelines rather than this reference entry.

History

Earlier nosology grouped many of these conditions under "anxiety neurosis" and broad neurotic categories; modern classification in the DSM and ICD separated them into discrete disorders and, in DSM-5, moved obsessive-compulsive and trauma-related conditions into their own chapters, narrowing the anxiety disorders category.

Debates

Where should the boundaries of the anxiety disorders lie?

The reclassification of obsessive-compulsive and post-traumatic conditions out of the anxiety disorders, and the high overlap with depression, raise ongoing questions about how distinct these categories truly are.

Seminal works

• craske-2017
• apa-dsm5tr-2022

Frequently asked questions

When does anxiety become a disorder?

Anxiety becomes a disorder when it is excessive or persistent, out of proportion to the actual situation, and interferes with daily life, rather than the normal, time-limited anxiety that everyone experiences in response to stress.

Are anxiety disorders and depression related?

They frequently occur together and share some risk factors and symptoms, but they are distinct diagnoses; many people experience both, which is relevant to assessment in nursing practice.