Published online by Cambridge University Press: 02 September 2021
Anxiety disorders, including post-traumatic stress disorder (PTSD), generalized anxiety disorder (GAD), panic disorder (PD) and phobias (including social phobia and agoraphobia), are the most common (1) and most economically costly psychiatric conditions (2). All anxiety disorders are characterized by pathological fear reactions and/or anxiety (3) in response to stimuli specific to each disorder in the absence of danger (4). Impairments in the ability to extinguish learned fear in response to specific stimuli and to learn safety behaviours are also cardinal characteristics of anxiety disorders (4). Because anxiety disorders are highly comorbid with other psychiatric conditions and adverse physical health conditions that increase mortality, including cardiovascular disease, obesity and diabetes (1,5), biomedical research has focused on defining the mechanisms underlying anxiety disorders.
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