Stress — Symptoms, Causes & Treatment | MyMedicPlus

Stress is the physiological and psychological response elicited when an individual perceives that environmental demands exceed their available coping resources. The acute stress response (commonly called the 'fight-or-flight' response) is a biologically evolved and adaptive survival mechanism: the perception of threat activates the hypothalamic-pituitary-adrenal (HPA) axis, triggering cortisol secretion from the adrenal cortex (raising blood glucose, mobilising energy, and suppressing immune, digestive, and reproductive functions), while simultaneous sympathetic nervous system activation causes adrenaline (epinephrine) and noradrenaline secretion from the adrenal medulla, producing the immediate physiological effects of stress (rapid heart rate, raised blood pressure, pupil dilation, muscle tension, and heightened alertness). Acute stress is normal and temporary. Chronic stress — sustained activation of these pathways over weeks, months, or years — causes allostatic load: pathological cumulative physiological 'wear and tear' from chronically elevated cortisol, catecholamines, and inflammatory cytokines. Chronic stress is now recognised as a major contributor to the global burden of non-communicable disease. Population surveys consistently report that over 80% of adults experience regular significant stress in modern life — with work-related stress being the most prevalent source in high-income countries. Stress exists on a spectrum from beneficial eustress (motivating, stimulating challenge that improves performance) through optimal arousal to distress (overwhelming, destructive, and impairing). The Yerkes-Dodson law describes an inverted-U relationship between arousal and performance — both insufficient stimulation and excessive stress impair function. Key occupations with the highest chronic occupational stress burden include: healthcare workers, emergency services personnel, teachers, caregivers, lawyers, and social workers.

Work-related stressors represent the most prevalent source of chronic stress in high-income countries: excessive workload (demands exceeding capacity), lack of control or autonomy over work tasks, lack of support from managers or colleagues (poor supervisory relationships — the single strongest predictor of occupational stress in research), poor work-life balance (unpaid overtime, working through holidays), job insecurity and fear of redundancy, workplace bullying or harassment, role ambiguity (unclear expectations), and shift work with disrupted circadian rhythms. The UK Health and Safety Executive (HSE) Management Standards framework identifies six work domains where poor management causes occupational stress. Life events as stressors (using the Holmes-Rahe Social Readjustment Rating Scale — SRRS): bereavement and grief (death of spouse or child — highest SRRS score); relationship breakdown and divorce; serious personal illness or injury; illness or caregiving for a family member; financial crisis or debt; job loss; and major life transitions (retirement, children leaving home, relocation). Chronic stressors: poverty and socioeconomic deprivation (living in economic hardship with chronically elevated allostatic load — explaining much of the socioeconomic health inequality); social isolation and loneliness (among the most powerful predictors of physical and mental health outcomes — equivalent risk to smoking 15 cigarettes per day); chronic pain and long-term illness; caring for a disabled or seriously ill family member (caregiver burnout); and racial discrimination and minority stress. Predisposing individual factors that amplify stress responses: Type A personality (time urgency, hostility, competitiveness — 2x cardiovascular risk); perfectionism; neuroticism; poor emotional regulation skills; prior adverse childhood experiences (ACEs — increasing HPA axis reactivity and baseline cortisol levels in adulthood); low social support; and maladaptive coping strategies (avoidance, rumination, substance misuse).

Physical symptoms of stress arise from sustained HPA axis and sympathetic nervous system activation: tension-type headaches (the most common stress-related physical symptom — caused by sustained muscle tension in the neck, scalp, and shoulders, often described as a tight band or pressure across the forehead); musculoskeletal tension (neck, shoulder, and lower back pain from chronically contracted muscles with reduced blood flow — common in desk workers and people under prolonged stress); fatigue (paradoxically persistent despite rest — from elevated cortisol interfering with restorative sleep architecture); sleep disturbance (initial insomnia and sleep-onset difficulty from hyperarousal and difficulty disengaging from ruminative worry, or early morning waking — the classic sleep disturbance of stress and depression); gastrointestinal symptoms (irritable bowel syndrome — IBS — affects 15% of people under chronic stress; nausea, diarrhoea or constipation alternation, bloating, and abdominal pain from HPA-gut axis interactions and altered gut motility); palpitations from catecholamine-driven tachycardia; elevated blood pressure (sustained sympathetic activation raises blood pressure 5-20 mmHg — accelerating hypertension progression); immune suppression (elevated cortisol suppresses lymphocyte proliferation and natural killer cell activity — increasing susceptibility to upper respiratory infections, viral reactivations such as herpes simplex and EBV, and delayed wound healing); skin manifestations (stress exacerbates acne, psoriasis, eczema, and urticaria through neurogenic inflammation and impaired skin barrier function); and menstrual irregularities in women from HPA axis suppression of the HPG axis. Psychological symptoms: anxiety (excessive worry about specific stressors or more generalised free-floating anxiety); irritability, impatience, and reduced frustration tolerance; poor concentration and working memory impairment (cortisol suppresses prefrontal cortex function and hippocampal memory consolidation); forgetfulness and difficulty with new learning; emotional lability (tearfulness, disproportionate reactions); low mood (stress-induced negative affective state that may progress to clinical depression with sustained exposure); anhedonia (reduced enjoyment and motivation); sense of overwhelm and inability to prioritise; and cynicism or detachment (the cognitive component of burnout). Behavioural symptoms: emotional or comfort eating (stress-induced hyperphagia from cortisol-driven craving for high-calorie foods); alcohol misuse (short-term anxiolytic but long-term amplifies anxiety, depression, and stress reactivity); smoking; social withdrawal and isolation; neglect of exercise, sleep hygiene, and health behaviours; procrastination; and presenteeism (working while too unwell to perform effectively).

There is no single biomarker or laboratory test that diagnoses stress — it is assessed through a combination of validated self-report questionnaires, clinical interview exploring the nature, severity, and duration of stressors, functional impact on work and relationships, and examination for stress-related physical symptoms and comorbid mental health conditions. Validated psychometric assessment tools: Perceived Stress Scale (PSS-10): the most widely used self-report tool for measuring subjective perception of stress over the past month (10 questions rated 0-4; total score above 13 indicates moderate stress, above 20 indicates high perceived stress); General Health Questionnaire (GHQ-12): a 12-item general psychological distress screening tool widely used in primary care and occupational health settings; Work Stress Questionnaire (WSQ) or HSE Management Standards Indicator Tool: specific for occupational stress, assessing the six work domains (demands, control, support, relationships, role, change); and COPE Inventory or Brief COPE for assessing coping strategies. Comorbid mental health conditions must be assessed because stress frequently transitions to or coexists with clinical anxiety or depression: PHQ-9 (Patient Health Questionnaire-9) for depression screening (score above 10 indicates moderate-severe depression); GAD-7 (Generalised Anxiety Disorder-7) for anxiety (score above 10 indicates moderate-severe anxiety); and audit-C or AUDIT for alcohol misuse screening (alcohol misuse rates are significantly elevated in people with chronic stress). Laboratory investigations to exclude organic medical conditions that can cause or closely mimic the physical symptoms of stress: thyroid function tests (TSH and free T4 — hyperthyroidism causes anxiety, palpitations, heat intolerance, weight loss, and insomnia that can be misattributed to stress; hypothyroidism causes fatigue, cognitive slowing, and low mood resembling stress and depression); morning serum cortisol (if Cushing's syndrome is suspected — characterised by central obesity, striae, hypertension, glucose intolerance, and fragile skin alongside mood changes and fatigue); full blood count (anaemia causing fatigue and palpitations); fasting glucose (diabetes mellitus presenting with fatigue); and ECG if palpitations are prominent (to exclude cardiac arrhythmia).

Psychological: CBT (highest evidence for stress reduction and related anxiety/depression); Mindfulness-Based Stress Reduction (MBSR) — 8-week structured program; Problem-Solving Therapy (PST); progressive muscle relaxation; and biofeedback. Pharmacological: SSRIs/SNRIs for comorbid anxiety or depression; beta-blockers (propranolol) for acute somatic symptoms; short-term benzodiazepines for crisis only. Organizational: workplace wellbeing programs. Regular monitoring of treatment response, early detection of side effects, and ongoing assessment of disease progression are essential components of optimising patient outcomes over the long term. Treatment plans should be proactively reviewed and appropriately adjusted based on clinical response, patient-reported tolerability, changing patient circumstances, and continuously evolving evidence-based clinical guidelines. Meaningful shared decision-making between patients and their healthcare team, incorporating patient values and treatment preferences, consistently improves both treatment adherence and long-term outcomes. Consultation with an experienced specialist ensures patients receive the most appropriate and up-to-date management throughout the course of their condition.

Chronic unmanaged stress leads to: burnout (complete exhaustion with depersonalization), major depression, generalized anxiety disorder, cardiovascular disease (2x risk of MI with chronic work stress), hypertension, type 2 diabetes, immune dysfunction (reduced NK cell activity), substance use disorders, and significantly impaired occupational and social functioning. Long-term specialist follow-up and structured regular review are essential to detect and appropriately manage complications at the earliest possible stage, minimising long-term disability, preserving organ function, and improving the overall prognosis. Patient education about the early warning signs of complications and clear guidance on when to seek urgent medical attention empowers timely help-seeking behaviour and reduces preventable serious adverse outcomes. Psychological impact — including depression, anxiety, and reduced quality of life — should be proactively assessed and addressed as part of comprehensive complication management.

Regular aerobic exercise is the most evidence-backed lifestyle intervention for stress, anxiety, and mood: 30 minutes of moderate-intensity aerobic exercise (brisk walking, cycling, swimming, running) on most days of the week produces significant reductions in cortisol, inflammatory markers (CRP, IL-6), and perceived stress; meta-analyses show aerobic exercise is comparable to antidepressants for mild-moderate depression and anxiety in effect size; and benefits appear within 2-4 weeks of starting a regular programme. Prioritise restorative sleep: 7-9 hours for adults is the recommended target; chronic sleep deprivation dramatically amplifies cortisol reactivity, reduces emotional resilience, and significantly worsens stress tolerance; optimise sleep hygiene (consistent sleep and wake times, dark and cool bedroom, no screens 1 hour before bed, no caffeine after 2pm, limit alcohol which disrupts sleep architecture). Mindfulness meditation practice: multiple randomised controlled trials and meta-analyses support Mindfulness-Based Stress Reduction (MBSR) and mindfulness practice for cortisol reduction, lowering perceived stress, and improving emotion regulation; even 10-20 minutes of daily mindfulness practice produces measurable neurobiological changes (reduced amygdala reactivity, increased prefrontal cortex activity). Social connection: strong social support networks are consistently the most powerful protective factor against stress-related health consequences — maintain regular contact with supportive relationships; join community groups, volunteer, or access peer support. Work-life boundary management: define clear boundaries between work time and personal time; turn off email and work communications outside working hours; use annual leave for genuine rest; communicate clearly with managers about workload capacity. Healthy diet: the Mediterranean dietary pattern (olive oil, legumes, vegetables, fruits, whole grains, fish) is associated with 25-35% reduction in depression and anxiety risk; omega-3 fatty acids (oily fish, flaxseed) reduce inflammatory cytokine production driven by chronic stress. Limit caffeine (above 400 mg per day exacerbates anxiety and stress reactivity) and alcohol (short-term anxiolytic but long-term amplifies HPA axis dysregulation and worsens mood).

Seek emergency help (call 999, 116 123 Samaritans, or go to A&E) immediately if you are experiencing thoughts of suicide or self-harm, or if the stress has escalated to a mental health crisis. See your GP as soon as possible if: stress is significantly impairing your ability to work, maintain relationships, or care for yourself or dependants; you have been managing with alcohol, drugs, or other potentially harmful coping strategies; physical symptoms of stress (chest pain, palpitations, severe headaches, significant weight change, persistent sleep disruption) have emerged — these require medical assessment to rule out organic causes; and you have been under significant stress for more than 2-3 weeks with no improvement despite self-help strategies. Referral pathways from your GP include: CBT-based talking therapy via IAPT (Improving Access to Psychological Therapies in England) or equivalent primary care mental health services; referral to occupational health for work-related stress; and referral to psychiatry or psychology for complex, persistent, or severe presentations or comorbid depression and anxiety. You do not need to be in crisis to seek support — early intervention prevents stress from progressing to clinical burnout, depression, or anxiety disorder.