Anxiety Disorders

Anxiety disorders are a group of conditions characterized by excessive, persistent fear and anxiety and by the behavioural disturbances they produce. They include generalized anxiety disorder, panic disorder, agoraphobia, social anxiety disorder, and specific phobias, and they are among the most common mental health presentations in primary care. This entry presents the family-medicine reference view of the group; a sibling psychiatric entry treats anxiety disorders from the specialist-nosology perspective.

Definition

Anxiety disorders are characterized by excessive fear (an emotional response to a perceived imminent threat) and anxiety (anticipation of a future threat), out of proportion to the actual situation, that persist over time and cause clinically significant distress or impairment; the specific disorders are distinguished by the objects or situations that trigger the fear and by the associated behavioural responses.

Scope

The entry covers the shared features of the anxiety-disorder group as defined in standard classifications, the distinctions among its principal members, hypothesized mechanisms, and population burden, framed for the generalist setting. It cross-links to the existing psychiatric anxiety-disorders entry and does not provide diagnostic instruments or individualized treatment guidance.

Core questions

• What separates a clinical anxiety disorder from normal, adaptive anxiety?
• How are the individual anxiety disorders distinguished from one another?
• What mechanisms are thought to underlie the development and persistence of pathological anxiety?

Key concepts

• Fear versus anxiety
• Generalized anxiety disorder
• Panic disorder and agoraphobia
• Social anxiety disorder
• Specific phobia
• Avoidance and safety behaviours
• Fear-conditioning and extinction

Mechanisms

Pathological anxiety is understood to arise from dysregulation of fear and threat-processing circuitry, with amygdala-centred networks and their cortical regulation featuring prominently in neurobiological accounts. Learning-theory models emphasize fear conditioning, and the maintenance of disorder through avoidance and safety behaviours that prevent extinction of learned fear. Genetic vulnerability, temperament, and adverse experiences are described as predisposing factors interacting within a stress-diathesis framework.

Clinical relevance

Anxiety disorders are very common in primary care, often co-occur with depression and with each other, and may present through physical (somatic) complaints. This entry describes the clinical concepts and the evidence base for understanding them as reference material; it is not a tool for diagnosing or treating an individual patient.

Epidemiology

Anxiety disorders are among the most prevalent mental disorders worldwide and rank highly among causes of years lived with disability in the Global Burden of Disease analyses. They typically have an early age of onset relative to many other psychiatric conditions, are more frequently diagnosed in women, and often follow a chronic or relapsing course.

Evidence & guidelines

The group is defined in the DSM-5, which reorganized the anxiety-disorder chapter (for example separating obsessive-compulsive and trauma-related disorders into their own chapters), and in the ICD-11 (anxiety or fear-related disorders, codes 6B00-6B0Z). Narrative reviews summarize clinical features and mechanisms, and the Global Burden of Disease studies quantify population impact. Specific management recommendations are issued by national bodies and lie outside this reference entry.

History

Concepts such as anxiety neurosis and phobia have a long history in psychiatry, but the modern grouping was shaped by twentieth-century nosology; the DSM-III introduced operationalized anxiety-disorder categories, and subsequent editions, including the DSM-5, refined their organization, while learning-theory and neurobiological research progressively clarified mechanisms of fear and avoidance.

Debates

How should the anxiety-related disorders be grouped?

The DSM-5 moved obsessive-compulsive and post-traumatic conditions out of the anxiety-disorders chapter, and the boundaries among generalized anxiety, depression, and other fear-related disorders remain a subject of nosological discussion.

Seminal works

• craske-stein-2016
• morrison-heimberg-2013
• vos-2022

Frequently asked questions

When does anxiety become a disorder?

Anxiety is a normal, often adaptive response to threat; it is considered a disorder when it is excessive and out of proportion to the situation, persists over time, and causes clinically significant distress or impairment in functioning.

How does this entry relate to the other anxiety-disorders entry in the atlas?

This entry presents anxiety disorders from the family-medicine reference perspective, while a separate atlas node treats them under the specialist psychiatric classification; the two are cross-linked as neighbours rather than duplicated.