Anxiety

• 1. Introduction

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  Anxiety is not the same as fear, and that distinction turns out to matter enormously. Fear, as psychologist David Barlow describes it, is a response to something present and immediate. Anxiety is something else entirely: it is directed at what has not yet happened. Barlow defines it as "a future-oriented mood state in which one is not ready or prepared to attempt to cope with upcoming negative events." That small grammatical shift, from present to future, opens onto a vast territory of human experience.

  Anxiety accompanies an enormous share of human life. Anxiety disorders affect roughly 12% of people in any given year, and between 12% and 30% at some point across their lifetimes. They appear about twice as often in women as in men, tend to begin before age 25, and are most prevalent among people aged 15 to 35. They are also among the most persistent of all mental conditions, sometimes lasting decades.

  What drives anxiety, how it is classified, and what can be done about it are questions that have occupied philosophers, psychologists, and researchers for generations. The answers draw on genetics, evolutionary biology, brain science, and social history all at once.

• 2. Fear Versus Anxiety

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  Joseph E. LeDoux and Lisa Feldman Barrett have both sought to separate automatic threat responses from the additional cognitive activity that anxiety layers on top. Their work points to a fundamental asymmetry in how the brain handles present versus future danger.

  Fear and anxiety differ across four recognizable dimensions: how long the emotion lasts, where its attention sits in time, how specific the threat is, and what behavior it drives. Fear is short-lived and present-focused, geared toward a specific threat, and it motivates escape. Anxiety is long-acting and future-focused, oriented toward a diffuse and not yet defined threat, and it promotes excessive caution rather than decisive action.

  In positive psychology, anxiety carries a slightly different charge. There it is described as the mental state that results when a person faces a difficult challenge for which they lack sufficient coping skills. The philosopher Soren Kierkegaard captured something close to this in The Concept of Anxiety, published in 1844, where he described anxiety as the "dizziness of freedom": the disorientation that comes not from danger but from an overwhelming awareness of one's own choices.

  Psychoanalytic theory adds another layer, distinguishing three types of anxiety by source: realistic anxiety, neurotic anxiety, and moral anxiety. Each maps onto a different relationship between the self and the world it perceives as threatening.

• 3. Existential Roots

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  Kierkegaard's 1844 account was not the end of philosophical inquiry into anxiety; it was closer to a starting point. In Art and Artist, published in 1932, the psychologist Otto Rank argued that the psychological trauma of birth was the primary human symbol of existential anxiety, containing within it the creative person's simultaneous fear of and desire for separation, individuation, and differentiation.

  The theologian Paul Tillich mapped the territory more systematically. He defined existential anxiety as "the state in which a being is aware of its possible nonbeing" and identified three categories. Ontic anxiety concerns fate and death. Moral anxiety concerns guilt and condemnation. Spiritual anxiety concerns emptiness and meaninglessness. Tillich argued that this third type is the one that predominates in modern times, while the other two were more central in earlier eras.

  Tillich also warned about what happens when spiritual anxiety is resisted rather than accepted. In its pathological form, it may drive a person toward certitude in systems of meaning supported by tradition and authority, even when that certitude is not, as he put it, "built on the rock of reality."

  Viktor Frankl, the author of Man's Search for Meaning, pressed further still. He wrote that when a person faces extreme mortal dangers, the most basic of all human wishes is to find a meaning of life that can combat the "trauma of nonbeing" as death approaches.

• 4. What the Body Does

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  Anxiety does not stay in the mind. Its physiological reach is extensive and cuts across nearly every organ system. Neurological symptoms include headache, vertigo, and presyncope. Cardiac symptoms include palpitations, tachycardia, and chest pain. Respiratory symptoms range from shortness of breath to sighing breathing. The digestive system produces abdominal pain, nausea, diarrhea, dry mouth, and the sensation known as globus. Stress hormones released during anxious states also affect bowel function in ways that can contribute to or worsen irritable bowel syndrome.

  Muscular effects include fatigue, tremors, and tetany. Cutaneous effects include perspiration and itching. Urogenital effects include frequent urination and urinary urgency. This list is not exhaustive; the source notes additional manifestations across multiple organ systems.

  The behavioral effects are equally varied. Withdrawal from situations that have previously provoked anxiety is common. So are changes in sleeping patterns, shifts in food intake, and increased motor tension such as foot tapping. The cognitive effects include trouble concentrating, anticipating the worst, irritability, and a persistent watch for signs of danger.

  When people encounter foul odors or other unpleasant stimuli, PET scans show increased blood flow in the amygdala. In those same studies, participants reported moderate anxiety. This pattern suggests that anxiety may function partly as a protective mechanism, designed to prevent organisms from engaging in potentially harmful behaviors.

• 5. Anxiety in Competition and Performance

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  The Yerkes-Dodson law holds that an optimal level of arousal is necessary to perform well on tasks like exams, performances, or competitive events, and that when anxiety exceeds that optimum, performance declines. This observation anchors four major theories about how anxiety and performance interact.

  Drive theory proposes that anxiety is positive and that performance improves proportionally to the level of anxiety; the source notes this theory is not well accepted. The Inverted U theory, named for the shape of its graph when performance is plotted against anxiety, proposes that performance peaks at a moderate stress level and falls off on either side. Reversal theory suggests that outcomes depend on the individual's interpretation of their own arousal: athletes who believed their physical arousal would help them performed better; those who did not, performed worse.

  The Zone of Optimal Functioning theory proposes something more specific: there exists a zone where positive and negative emotions balance in a way that produces dissociation and intense concentration, optimizing performance.

  Test anxiety among U.S. high-school and college students has been rising since the late 1950s. Students experiencing it may report a fear of failing, fear of embarrassment by a teacher, fear of alienation from parents or friends, or a sense of time pressure and loss of control. The DSM-IV classifies test anxiety as a type of social phobia. One behavioral treatment for anxiety conditions relies on slow, device-guided breathing as a major component.

• 6. Genetics and Social Risk

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  Twin studies suggest that genetics accounts for roughly 30 to 40% of individual differences in anxiety. Within that range, specific disorder types vary: genetic differences account for about 43% of variance in panic disorder and 28% in generalized anxiety disorder. Longitudinal twin research indicates that the moderate stability of anxiety from childhood into adulthood is mainly driven by stable genetic influence.

  Candidate gene studies have tested many single genes; most findings have not replicated. Possible exceptions include TMEM132D, COMT, and MAO-A. The gene BDNF, which codes for a protein called brain-derived neurotrophic factor, has been linked to anxiety through its epigenetic signature and through neural activity patterns. A receptor gene for BDNF called NTRK2 was associated with anxiety in a large genome-wide investigation. Large-scale explorations of the common genetic architecture of anxiety have been led by the UK Biobank, the ANGST consortium, and the CRC Fear, Anxiety and Anxiety Disorders consortium.

  Environmental and social risk factors run alongside the genetic ones. A 2019 systematic review of over 50 studies found that food insecurity in the United States is strongly associated with depression, anxiety, and sleep disorders; food-insecure individuals had nearly a threefold increased risk of testing positive for anxiety compared to food-secure individuals. Other social risk factors include a history of trauma, bullying, rejection, harsh discipline, poverty, and high parental negative affect.

  Gender differences in anxiety are real, with higher levels consistently found in women than in men, but gender socialization and learning mastery, meaning the degree to which people perceive their lives to be under their own control, fully account for those differences in the research literature.

• 7. Treatment and Prevention

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  Cognitive behavioral therapy is a first-line treatment for anxiety disorders, and the evidence indicates it is equally effective when delivered via the internet. Medications also play a role, and the two approaches can be combined or used independently.

  Selective serotonin reuptake inhibitors and serotonin-norepinephrine reuptake inhibitors are first-line drug treatments; they work by blocking the reuptake of specific neurotransmitters, increasing the availability of those neurotransmitters in the brain. Benzodiazepines produce an anxiolytic effect by modulating GABA-A receptors, but they are generally not recommended for use longer than 2 to 4 weeks because of rapid tolerance, addiction, and physical dependence. The National Institute for Health and Clinical Excellence recommends only antidepressants for longer-term medication management.

  A third drug category, serotonin agonists such as those in the azapirone class, works by initiating a response at the 5-HT1A receptor, increasing the action of serotonin there. Other options include pregabalin, tricyclic or tetracyclic antidepressants such as mirtazapine, and moclobemide.

  A 2023 review found that regular physical activity is effective for reducing anxiety. Psychological and educational interventions produce a small but statistically significant benefit for prevention across varied population types. Improvement in dietary intake has also been linked to lower anxiety risk, pointing back to the 2019 finding that food insecurity nearly triples a person's risk of testing positive for anxiety.