Cognitive Connie
Anxiety Disorders
Anxiety disorders are the most prevalent category of mental health conditions globally, affecting people across the full lifespan. Most disorders in this category have their first onset during childhood, adolescence, or early adulthood — from specific phobia and separation anxiety in childhood, through social anxiety disorder which typically peaks in adolescence, to generalised anxiety disorder and panic disorder which are more commonly first diagnosed in early adulthood. Women are approximately twice as likely as men to receive a diagnosis, a disparity seen across most of the anxiety disorders, though its causes remain poorly understood and are likely multifactorial.
Defining features
Key definitions
Fear vs anxiety.
Though often used interchangeably, fear and anxiety are distinct states that differ in their object, time orientation, and the nature of the threat they respond to.
Immediate and present
Distal or uncertain
Present-focused
Future-focused
Fight-or-flight alarm
Apprehensive expectation
02, Major types
The anxiety disorders.
DSM-5 and ICD-10 agree on most disorders but differ in how they name, code, and group them. Click any disorder to see its classification details, core features, and typical onset.
Quick quiz
Identify the disorder.
Read each clinical description and select the anxiety disorder it best fits.
“She talks freely at home, laughs with her siblings, and chats on the phone with grandparents — but has not said a single word at school in months, even when her teacher asks her directly.”
03. Epidemiology
How common are anxiety disorders?
Anxiety disorders are consistently the most prevalent category of mental disorder in population surveys worldwide. Several patterns cut across the specific diagnoses.
Global prevalence
Anxiety disorders collectively represent the most prevalent category of mental health conditions worldwide, ahead of mood disorders, substance use disorders, and psychotic disorders. Estimated 12-month prevalence across all anxiety disorders is approximately 10–11%, with lifetime estimates ranging from 15% to 30% depending on diagnostic system and study methodology.
Early onset — and lifelong persistence
Anxiety disorders tend to start early. The 12-month prevalence in children and adolescents is comparable to that seen in adults, reflecting both the early onset of most specific disorders and their tendency to persist rather than remit spontaneously. Specific phobia and separation anxiety typically emerge in childhood; social anxiety disorder peaks in adolescence; generalised anxiety disorder and panic disorder are more commonly first diagnosed in early adulthood.
Comorbidity is the norm
As many as half of individuals with one anxiety disorder meet criteria for another anxiety disorder at some point in their lives. Comorbidity with major depressive disorder is particularly pronounced — especially in GAD, which shares so much genetic and phenomenological overlap with depression that some researchers question whether they are distinct conditions. Substance use disorders also co-occur at elevated rates, with the relationship often bidirectional. Several specific disorders — including panic disorder, agoraphobia, and social anxiety disorder — are themselves risk factors for the later development of depressive disorders and substance abuse, underlining that anxiety is often the earlier and driving condition in these trajectories.
04. Risk factors
Who is most at risk?
Risk factors for anxiety disorders span biological, temperamental, and environmental domains. Some are specific to anxiety; most elevate risk across a broader range of mental health conditions.
Female sex
Being female is one of the most consistent risk factors for anxiety disorders. Women are approximately twice as likely as men to receive a diagnosis — a ratio observed across most specific disorders, though less pronounced in social anxiety disorder. Notably, this disparity is not present in childhood: boys and girls show broadly similar rates of anxiety disorders in early life. The gap emerges during adolescence, suggesting that hormonal changes, shifting social pressures, and the psychological demands of puberty all play a role.
Family history
Having a first-degree relative with an anxiety disorder substantially elevates personal risk. A child whose parent has at least one anxiety disorder is two to four times more likely to develop an anxiety disorder themselves. When a parent has both an anxiety disorder and depression, the risk amplifies further — indicating that parental depression acts as an independent risk factor, not merely a marker of anxiety. Twin studies estimate heritability at approximately 30–50%, with the remaining variance reflecting environmental influences, many of which are shared within families.
Non-specific risk factors
Low socioeconomic status, childhood maltreatment, physical punishment, and parental history of any mental disorder all increase vulnerability — not specifically to anxiety, but to mental health difficulties broadly. Their non-specificity means they cannot predict which disorder will develop, only that overall risk is elevated.
Behavioural inhibition
A temperamental style in early childhood marked by withdrawal, wariness, and clinging in novel or social situations. Unlike most risk factors, behavioural inhibition more selectively predicts social anxiety disorder rather than elevating risk across all anxiety disorders equally — reflecting an underlying sensitivity to social evaluation and novelty.
Key concepts
Dimensional continuum
Anxiety exists on a continuum of severity across the population rather than falling into discrete categories. Diagnostic thresholds in DSM-5 and ICD-10 represent clinically useful cut-points on this dimension, but the underlying biology and psychology operate dimensionally — which is why subclinical anxiety still causes functional impairment.
Overgeneralisation of conditioned fear
A proposed pathophysiological process in which fear originally learned in response to a specific stimulus extends to stimuli that are similar to, or merely associated with, the original threat — often spreading to stimuli that pose little or no genuine danger. Thought to be a key mechanism maintaining many anxiety disorders.
Deficit in fear extinction
Impaired ability to inhibit or suppress a conditioned fear response when the threat is no longer present. Extinction is thought to create a new competing inhibitory memory rather than erasing the original fear memory. In anxiety disorders, this new learning may be weaker or less stable, allowing fear to persist or return after apparent remission.
Amygdala and insula overactivity↗
Functional MRI studies in anxiety disorders consistently show overactivity in the amygdala (fear detection and initiation of the threat response) and the insula (interoceptive awareness of bodily states) in response to threat-related stimuli. This neural pattern is consistent with theoretical accounts of overgeneralised conditioned fear and the intense somatic sensations that accompany anxiety.
Test your knowledge
Frequently asked questions
Which anxiety disorder has the highest lifetime prevalence?+
Specific Phobia, with lifetime prevalence estimates of 6–12%, is the most prevalent anxiety disorder. The high rate partly reflects that most individuals with phobias have more than one, and many phobias cause less overall impairment than conditions like GAD or panic disorder — meaning they persist without treatment and accumulate in population estimates. Social Anxiety Disorder is the second most common, at approximately 10% lifetime prevalence.
Why did DSM-5 separate Panic Disorder and Agoraphobia into independent diagnoses?+
DSM-IV had treated Agoraphobia as a specifier of Panic Disorder ("Panic Disorder with Agoraphobia" or "without Agoraphobia"). Research demonstrated that a substantial minority of people develop Agoraphobia without ever having Panic Disorder, which justified making Agoraphobia a fully independent diagnosis. In DSM-5, both can be diagnosed simultaneously — or either can exist without the other.
What distinguishes a specific risk factor from a non-specific risk factor?+
Non-specific risk factors — such as low socioeconomic status, childhood maltreatment, and parental history of any mental disorder — increase vulnerability to a wide range of mental health conditions, not exclusively to anxiety disorders. Specific risk factors more selectively predict certain disorders. Behavioural inhibition is one of the more specific risk factors in the anxiety literature: unlike most environmental risks, it particularly predicts Social Anxiety Disorder rather than elevating risk across all anxiety disorders equally.
Sources
Last reviewed July 2025- 1.
Craske, M. G., & Stein, M. B. (2016). Anxiety. The Lancet, 388(10063), 3048–3059. https://doi.org/10.1016/S0140-6736(16)30381-6
+About this source
Comprehensive Lancet review covering the global epidemiology, risk factors, pathophysiology, and management of anxiety disorders. Primary basis for the epidemiological and risk factor content in this READS.
Michelle Craske is a clinical psychologist at UCLA and one of the leading figures in anxiety research. Beyond the epidemiological work in this review, she is known for developing the inhibitory learning model of exposure therapy — the idea that effective exposure creates a new competing inhibitory memory rather than erasing the original fear memory.
Murray Stein is a psychiatrist at the University of California San Diego and a leading specialist in anxiety disorders. Together, Craske and Stein's 2016 Lancet review synthesised global data across epidemiology, risk factors, pathophysiology, and clinical management, and remains one of the most widely cited overviews of the field.
- 2.
Craske, M. G., Stein, M. B., Eley, T. C., Milad, M. R., Holmes, A., Rapee, R. M., & Wittchen, H.-U. (2017). Anxiety disorders. Nature Reviews Disease Primers, 3, 17024. https://doi.org/10.1038/nrdp.2017.24
+About this source
Nature Reviews Disease Primers overview of anxiety disorders covering epidemiology, mechanisms, diagnosis, and treatment. Source for the data on the treatment gap (most cases going undetected and untreated even in high-income countries) and the chronic, waxing-and-waning course of untreated anxiety disorders.
- 3.
American Psychiatric Association. (2013). Diagnostic and statistical manual of mental disorders (5th ed.). American Psychiatric Publishing. https://doi.org/10.1176/appi.books.9780890425596
+About this source
Primary source for all DSM-5 diagnostic criteria, disorder classification, duration thresholds, and structural changes from DSM-IV.
- 4.
World Health Organization. (1992). The ICD-10 classification of mental and behavioural disorders: Clinical descriptions and diagnostic guidelines. World Health Organization.
+About this source
Primary source for ICD-10 codes and criteria across the anxiety disorders (F40–F41) and related categories (F45, F93, F94).