Anxiety

Anxiety is a universal emotional response that serves an essential adaptive function: alerting the organism to possible threats and preparing it for action. In its normal form, anxiety sharpens attention, mobilizes energy resources, and facilitates the fight-or-flight response. However, when the intensity, duration, or frequency of anxiety is disproportionate to the actual threat, or when it appears in the absence of objective danger, it becomes pathological. The dividing line between normal and pathological anxiety is not sharp but constitutes a continuum influenced by biological, psychological, and social factors.

Anxiety disorders constitute the most prevalent group of mental disorders worldwide. The DSM-5 includes generalized anxiety disorder (excessive and persistent worry), panic disorder (recurrent attacks of intense fear), specific phobias (intense fear of particular objects or situations), social anxiety disorder (fear of negative evaluation by others), and agoraphobia (fear of situations from which it would be difficult to escape). These disorders share the central feature of excessive anxiety but differ in the objects or situations that trigger it and in the associated patterns of avoidance behavior.

From a neurobiological perspective, anxiety involves a complex network of brain circuits. The amygdala acts as an alarm system, rapidly evaluating potentially threatening stimuli and activating the stress response. The prefrontal cortex performs regulatory functions, modulating amygdalar reactivity. In anxiety disorders, an imbalance occurs between excessive amygdalar activation and insufficient prefrontal regulation. The neurotransmitters GABA, serotonin, and norepinephrine play fundamental roles in anxiety modulation, and their alterations constitute the basis for pharmacological interventions.

Treatment for anxiety disorders encompasses a broad range of empirically supported interventions. Cognitive-behavioral therapy is the psychological treatment with the strongest evidence base, combining cognitive restructuring (identifying and modifying catastrophic thoughts) with exposure techniques (gradual confrontation with feared situations). Aaron Beck and David Clark demonstrated that individuals with pathological anxiety overestimate the probability and severity of threats while underestimating their coping capacity. Selective serotonin reuptake inhibitors are the first-line pharmacological treatment, and the combination of pharmacotherapy and psychotherapy often produces the best outcomes.