Psychology › Mental health & disorders
Anxiety disorders
· Condition or disorder
Well replicatedStrong, repeated evidence.
A family of conditions in which fear and worry are out of proportion to real danger, persist, and disrupt daily life.
See it on the Psychology map →What it says
Anxiety disorders include generalized anxiety (constant worry), panic disorder (sudden surges of terror with a pounding heart), social anxiety, agoraphobia and specific phobias such as fear of flying. About 31 percent of US adults meet criteria at some point, women about twice as often as men, usually starting in childhood or the teens. Avoidance brings short-term relief but keeps fear alive. Cognitive behavioral therapy with gradual exposure, and SSRI medications, help most people.
Why it matters
Normal anxiety is a useful alarm; these disorders are the alarm stuck on. They are common, cause major disability, and respond well to treatment.
Think of it like
Like a smoke detector that shrieks at burnt toast: the alarm works, it is just set far too sensitive.
The evidence
The US National Comorbidity Survey Replication (2001–03) and WHO surveys give prevalence; many controlled trials show exposure-based therapy and SSRIs work, often with lasting gains.
Open questions
Why rates appear to be rising among teens and young adults, and how much smartphones and social media contribute, is hotly debated.
Inside this (2)
Connections (8)
▸The amygdala: threat detection and fear is overactive in Anxiety disordersMixed evidence
The connection
The amygdala flags possible threats and triggers fear responses. Brain scans often show it reacting more strongly to angry faces or threat words in people with anxiety disorders, while the prefrontal cortex may fail to calm it, so alarms fire too easily and fade too slowly.
Who showed it and when
Joseph LeDoux's fear-circuit studies in rats at Cornell and then NYU in the 1980s–90s; human brain imaging of anxiety patients from the late 1990s onward.
How solid is it?
Many imaging studies find heightened amygdala responses, but large recent analyses show small, inconsistent effects. A woman with amygdala damage, 'S.M.', shows strikingly little fear.
Open questions
LeDoux himself argues the amygdala detects threat but does not create the felt experience of fear or anxiety, which involves wider brain networks.
▸Classical conditioning (Pavlov's dogs) helps explain phobias among Anxiety disordersMixed evidence
The connection
When a neutral thing is paired with fright, it can come to trigger fear on its own, much as Pavlov's dogs learned to salivate at a signal. This explains some phobias, and its flip side, unlearning fear through repeated safe exposure, is the basis of exposure therapy.
Who showed it and when
John Watson and Rosalie Rayner's 1920 'Little Albert' study at Johns Hopkins; Joseph Wolpe's systematic desensitization in South Africa in the 1950s.
How solid is it?
Fear conditioning is easily shown in animals and people in labs, and exposure therapy built on it is among the best-supported phobia treatments.
Open questions
Many people with phobias recall no frightening event, and people fear snakes more readily than cars, suggesting evolution primes some fears. Little Albert itself was ethically and scientifically weak.
▸Neuroticism and emotional stability raises the risk of Anxiety disordersWell replicated
The connection
People high in neuroticism react more strongly to stress and worry more, making anxiety disorders more likely. In long-term studies, high scorers develop anxiety and depression far more often. The trait and the disorders share much of their genetic basis, so neuroticism works like an underlying vulnerability.
Who showed it and when
Hans Eysenck tied the trait to 'neurosis' in the 1940s–50s; modern evidence comes from cohort studies and genome-wide studies since the 2010s.
The evidence
A 2010 meta-analysis by Roman Kotov found large neuroticism differences across anxiety and depressive disorders; twin studies show shared genes.
Open questions
Whether neuroticism causes anxiety disorders, or is simply a milder, lasting form of the same tendency, is debated.
▸Anxiety disorders are the most common group of Mental disorders: what they are and how commonWell replicated
The connection
Anxiety disorders, taken together, affect more people than any other group of mental disorders: about one in five US adults in a given year and roughly 300 million people worldwide. Many start in childhood and go untreated for years.
Who showed it and when
The US National Comorbidity Survey Replication (2001–03, led by Ronald Kessler at Harvard) and WHO estimates for 2019.
The evidence
The pattern holds across large surveys in many countries, though exact rates vary with methods and cultural reporting.
Open questions
Whether high prevalence reflects real suffering or thresholds set too low is debated, as is the apparent recent rise among young people.
▸Anxiety disorders often co-occur with Depression and mood disordersWell replicated
The connection
About half of people with depression also have an anxiety disorder at some point, and vice versa. They share genes, the trait of neuroticism, and brain systems for threat and reward. Anxiety often comes first, in childhood or the teens, with depression following; both respond to SSRIs and CBT.
Who showed it and when
Shown in the US National Comorbidity Surveys of the 1990s–2000s and Kenneth Kendler's twin studies in Virginia.
The evidence
Large surveys show high overlap, and twin studies find the genes behind generalized anxiety and major depression are largely the same.
Open questions
Whether anxiety and depression are truly separate disorders or two faces of one 'internalizing' tendency is a central debate.
▸Post-traumatic stress disorder (PTSD) was once classed among Anxiety disordersWell replicated
The connection
From 1980 until 2013 the DSM listed PTSD among the anxiety disorders, because fear, hyperarousal and avoidance are central. DSM-5 moved it to a new 'trauma- and stressor-related' chapter, since it requires a triggering event and many patients' main problems are guilt, shame, anger or numbness.
Who showed it and when
DSM-III (1980) placed PTSD with the anxiety disorders; the DSM-5 work group moved it in 2013.
The evidence
The change is documented in DSM-5; PTSD and anxiety disorders still share genes, fear circuitry and exposure-based treatments.
Open questions
Some researchers see the move as mostly administrative; whether PTSD is fundamentally a fear disorder or a disorder of memory is debated.
▸Obsessive-compulsive disorder (OCD) is closely related to Anxiety disordersWell replicated
The connection
OCD's obsessions create intense anxiety and compulsions briefly relieve it, so OCD was classed as an anxiety disorder until 2013. DSM-5 gave it its own chapter because of its distinct brain circuits, repetitive behavior and links to conditions like hoarding, yet both respond to exposure therapy and SSRIs.
Who showed it and when
Classed with anxiety disorders in DSM-III (1980) and DSM-IV (1994); moved to the 'obsessive-compulsive and related disorders' chapter in DSM-5 (2013).
The evidence
Family, imaging and treatment studies show overlap with anxiety disorders but also differences, such as the central role of frontal–basal ganglia circuits.
Open questions
Whether OCD is better grouped with anxiety, with tic disorders, or with other repetitive behaviors remains debated.
▸Cognitive behavioral therapy (CBT; Beck, Ellis) is a first-line treatment for Anxiety disordersWell replicated
The connection
CBT for anxiety combines gradual exposure to feared situations with testing catastrophic predictions, such as 'my racing heart means a heart attack'. It treats panic disorder, social anxiety, generalized anxiety and phobias, typically in 8 to 16 sessions, and its gains often outlast those of medication.
Who showed it and when
David Clark at Oxford and David Barlow in the US developed influential panic treatments in the 1980s; protocols for social anxiety and chronic worry followed in the 1990s.
The evidence
Many randomized trials and meta-analyses support it; the UK's NICE guidelines recommend it as a first treatment for most anxiety disorders.
Open questions
Perhaps 40 to 50 percent of patients still have notable symptoms after treatment; how to help them is a major research question.