Nervousness and anxiety are natural physiological and psychological responses that help us prepare for complex or challenging situations. They are part of the body’s stress-response system, designed to alert us to potential threats and mobilize resources for coping or problem-solving. In moderate amounts, anxiety can enhance focus, motivation, and performance.

However, these natural mechanisms can become insufficient or dysregulated. This can occur due to past experiences, early developmental or traumatic histories, or the cumulative stress of current life events. When anxiety exceeds what our coping systems can manage, it can manifest in a variety of ways—ranging from persistent worry, hypervigilance, and perfectionism, to intense physiological responses such as panic attacks, sleep disturbances, or chronic tension.

These physiological reactions are mediated by a complex interplay of hormones and neurotransmitters. Anxiety begins in the brain’s amygdala, which detects perceived threats and signals the hypothalamus. The hypothalamus activates the sympathetic nervous system, prompting the adrenal medulla to release adrenaline (epinephrine) and noradrenaline (norepinephrine). These catecholamines increase heart rate, blood pressure, respiration, and glucose availability in muscles—a state commonly referred to as the fight-or-flight response. Simultaneously, the hypothalamus stimulates the pituitary gland to release adrenocorticotropic hormone (ACTH), which signals the adrenal cortex to release cortisol. Cortisol sustains alertness and energy by modulating glucose metabolism and temporarily suppressing non-essential bodily functions, such as digestion.

At the neurotransmitter level, this hormonal surge interacts with GABA, serotonin, and dopamine systems. GABA normally calms neuronal activity, but prolonged stress can reduce its effectiveness, resulting in heightened arousal and tension. Serotonin, which regulates mood and anxiety, may become depleted or imbalanced, contributing to persistent worry or panic. Dopamine, involved in motivation and reward processing, may fluctuate, sometimes amplifying hypervigilance or perfectionistic tendencies. Over time, chronic activation of these systems can dysregulate the hypothalamic-pituitary-adrenal (HPA) axis, making the body more sensitive to stress, impairing sleep, and increasing vulnerability to anxiety disorders.

Understanding these mechanisms in therapy can help individuals recognize that their body’s overactivation is not “weakness” but a dysregulated stress response. Therapy aims not only to reduce symptoms but also to explore why anxiety is occurring at its current intensity. This involves identifying patterns of thought, behavioral responses, and emotional triggers, as well as understanding how past experiences shape present reactions.

Treatment approaches are varied and tailored to the individual. Cognitive-behavioral strategies restructure unhelpful thought patterns, while mindfulness or somatic therapies cultivate awareness and regulation of bodily sensations associated with anxiety. In some cases, psychodynamic or trauma-informed approaches provide insight into deeper relational or historical factors contributing to anxiety. The ultimate goal is to equip individuals with tools to manage anxiety effectively, reduce its disruptive impact, and foster a greater sense of agency and resilience in facing life’s inevitable challenges.

Anxiety & Mental Health Support – International Organisations

UK‑Specific Anxiety & Mental Health Resources

  • Anxiety UK – UK charity supporting people with anxiety disorders, offering helplines, therapy info, support groups, and self‑help guidance.
  • Mind – Major UK mental health charity with comprehensive information and support for anxiety and other mental health issues.
  • Samaritans – 24/7 free emotional support by phone (116 123 UK) or email for people in distress or struggling to cope.
  • Shout – UK 24/7 free text‑based mental health support (text “SHOUT” to 85258).
  • Hub of Hope – UK’s largest mental health support directory. Search for local and national anxiety, mental health, and community services.
  • Mental Health UK – Anxiety Resources – Lists UK charities and groups with anxiety support information and helplines.
  • NHS Mental Health Support – NHS guide to urgent and ongoing mental health support in England.