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Long COVID is when symptoms carry on for weeks or months after a COVID-19 infection. Common problems include fatigue, breathlessness, brain fog, palpitations and a reduced ability to exercise, and they can fluctuate from day to day. There is no single cure, but a structured, paced approach — gradually building activity without triggering crashes, breathing retraining and managing specific symptoms — helps most people improve. Care is tailored to your particular symptoms. This page explains long COVID and how it is managed.
Long COVID — also termed post-COVID-19 condition or post-acute sequelae of SARS-CoV-2 (PASC) — is a heterogeneous, multi-system condition that follows acute COVID-19 infection. Cardiorespiratory presentations are among the most common. The WHO Clinical Case Definition, the RACGP guidance, and Lung Foundation Australia resources are the principal Australian references.
Definition
The WHO Clinical Case Definition describes Long COVID as symptoms persisting or appearing at least 3 months after probable or confirmed SARS-CoV-2 infection, lasting at least 2 months, and not explained by an alternative diagnosis. Symptoms commonly fluctuate, relapse, and are aggravated by exertion or stress.1
Pathophysiology
Multiple overlapping mechanisms have been proposed: persistent viral antigen or reservoir, dysregulated immune response and autoimmunity, mitochondrial dysfunction, endothelial dysfunction and microvascular injury, autonomic dysregulation, mast cell activation, gut microbiome alteration, and tissue damage from acute illness. No single mechanism explains all phenotypes.2
Clinical phenotypes
Although symptom clusters overlap, recognising the dominant phenotype guides management: cardiorespiratory phenotype (dyspnoea, dysfunctional breathing, chest discomfort), fatigue-and-cognitive phenotype (post-exertional symptom exacerbation, "brain fog"), autonomic phenotype (POTS, orthostatic intolerance), and a multi-system phenotype with features of all.
Prevalence
Estimates of long COVID prevalence vary widely with case definition, infection wave, vaccination status and follow-up duration. Australian estimates suggest 5–10% of acute infections result in symptoms persisting beyond 3 months. Risk factors include severe acute illness, female sex, pre-existing chronic conditions, and pre-infection mental health diagnosis.3
Symptoms
Fatigue (often disproportionate and disabling), post-exertional symptom exacerbation (PESE/PEM), dyspnoea, cough, chest pain, palpitations, orthostatic intolerance, dysautonomia, cognitive impairment ("brain fog"), sleep disturbance, anosmia and dysgeusia, headache, joint pain, gastrointestinal symptoms, anxiety and depression.
Diagnosis
Why diagnosis matters
Long COVID is a clinical diagnosis based on history and exclusion of alternative causes. A careful approach prevents both under-recognition (with patients dismissed or escalated unnecessarily) and over-attribution (missing alternative diagnoses such as PE, hypothyroidism, anaemia, depression, or cardiac disease).
Initial assessment
Detailed history of acute infection, vaccination status, symptom timeline and triggers, post-exertional symptom exacerbation, and functional impact. Baseline investigations should be guided by phenotype but commonly include FBC, U&E, LFT, TFT, CRP, ferritin, vitamin D, B12, HbA1c, ECG, BNP/NT-proBNP, troponin if symptoms warrant, chest imaging, spirometry with DLCO, and consideration of cardiac and autonomic testing.
Cardiorespiratory phenotype assessment
Spirometry, DLCO, 6-minute walk with oximetry, ECG, echocardiography for selected patients, and assessment of breathing pattern. Cardiopulmonary exercise testing can be valuable for distinguishing pulmonary, cardiac, peripheral, and dysfunctional breathing contributors to exercise intolerance.
Autonomic and POTS assessment
Active stand or tilt-table testing for suspected POTS (see separate POTS chapter). A high proportion of long COVID patients with orthostatic intolerance meet POTS criteria.4,5
Exclusion of mimics
Specifically consider and exclude pulmonary embolism (during and after acute illness), myocarditis, new arrhythmia, thyroid disease, anaemia, sleep-disordered breathing, depression and anxiety, and medication side effects.
Management
Principles
Phenotype-led, multidisciplinary, paced rehabilitation with attention to post-exertional symptom exacerbation (PESE). Reassurance about likely improvement over time, while taking symptoms seriously and avoiding both dismissive and over-medicalising responses.
Pacing and energy management
Pacing is the foundation of rehabilitation in patients with PESE. The "envelope" of tolerable activity is identified through monitoring (subjective scales, heart rate cap below estimated anaerobic threshold, activity-symptom diaries). Standard graded exercise therapy is contraindicated in patients with PESE and may cause sustained worsening.6,7
Cardiorespiratory rehabilitation
In patients without PESE, a structured cardiorespiratory rehabilitation programme adapted from pulmonary rehabilitation is appropriate. Components include breathing retraining (very commonly required), supervised aerobic and resistance training, education, and psychological support.8,9,10
Breathing pattern intervention
Breathing pattern dysfunction is highly prevalent in long COVID and frequently underpins dyspnoea, chest discomfort, and exercise intolerance. Targeted physiotherapy-led breathing retraining is one of the most consistently effective interventions.
Treatment of specific contributors
Targeted treatment of identified contributors: POTS (see POTS chapter), MCAS, sleep disturbance, anxiety and depression, anosmia (smell training), GORD, and deconditioning. Vaccination remains recommended and does not, on balance, worsen long COVID in most patients.
Australian care pathways
Long COVID assessment clinics have been established at several Australian centres. The Lung Foundation Australia and the National COVID-19 Clinical Evidence Taskforce provide evolving guidance. GP-led care coordination, with allied health and specialist input as required, is the standard model.
Medications
Symptom-directed pharmacotherapy
There is no specific approved pharmacotherapy for long COVID. Symptom-directed treatment may include bronchodilators for objective airflow limitation, low-dose beta-blockers or ivabradine for POTS-related tachycardia, antihistamines for MCAS-like features, low-dose naltrexone in some specialist practice, and conventional treatment of identified depression, anxiety, and sleep disorders.
Caution with deconditioning narratives
Long COVID is not simply deconditioning. Treatment plans should avoid framing that minimises symptoms and should prioritise pacing-based rehabilitation in patients with PESE.
Multi-system manifestations
Post-exertional symptom exacerbation (PESE)
Worsening of symptoms after physical, cognitive, or emotional exertion, often with delayed onset and prolonged recovery. PESE is the cardinal feature that distinguishes long COVID rehabilitation from conventional cardiopulmonary rehabilitation.
Autonomic dysfunction and POTS
Orthostatic tachycardia, lightheadedness, palpitations, exercise intolerance, brain fog, and gastrointestinal symptoms. See the POTS chapter for detailed assessment and management.
Cognitive symptoms
Brain fog encompasses impaired concentration, working memory, word-finding, and processing speed. Sleep optimisation, treatment of mood disturbance, paced cognitive load, and gentle cognitive rehabilitation strategies all have a role.
Cardiac and respiratory sequelae
A minority have measurable cardiac (post-viral myocarditis, residual myocardial scar) or respiratory (post-COVID interstitial change, persistent reduced DLCO) abnormalities. These warrant specific diagnosis and treatment but account for only a fraction of long COVID symptoms overall.
Mental health
Depression, anxiety, post-traumatic symptoms, and grief about lost function are common. Screening and active management are essential and do not imply that the underlying illness is psychogenic.
Living with long COVID
Pacing in daily life
Pacing extends beyond exercise to all forms of energy expenditure — cognitive, social, emotional, and physical. Activity diaries, heart rate-based pacing, and pre-emptive rest blocks are effective tools.
Return to work and study
Graded return-to-work plans, workplace adjustments, and clear communication with employers and educators are central. Premature full-load return is a common cause of relapse.
Family and carer support
Long COVID disproportionately affects working-age adults and parents. Practical and psychological support for family members is an under-recognised need.
Prognosis
A substantial proportion of patients improve over months to years. Some patients have persistent or fluctuating symptoms beyond 2 years. Prognosis correlates with phenotype, severity at presentation, presence of PESE, and access to appropriate rehabilitation. Recurrent infection can cause symptom relapse.
Role of the physiotherapist
Physiotherapy for long COVID is paced and symptom-led. Where post-exertional symptom exacerbation is present, the physiotherapist guides careful activity pacing and energy management rather than pushing exercise, screens for dysfunctional breathing and provides breathing retraining, and introduces graded activity only when it can be tolerated without setback.
Warning signs
Part 1 · References
- National Institute for Health and Care Excellence, Scottish Intercollegiate Guidelines Network, Royal College of General Practitioners. COVID-19 rapid guideline: managing the long-term effects of COVID-19 (NG188). London: NICE; 2024.
- Singh SJ, Baldwin MM, Daynes E, et al. Respiratory sequelae of COVID-19: pulmonary and extrapulmonary origins, and approaches to clinical care and rehabilitation. Lancet Respir Med 2023;11(8):709–725.
- Ayoubkhani D, Bermingham C, Pouwels KB, et al. Trajectory of long covid symptoms after covid-19 vaccination: community based cohort study. BMJ 2022;377:e069676.
- Ladlow P, O'Sullivan O, Houston A, et al. Dysautonomia and exercise intolerance in post-COVID-19 syndrome. J Appl Physiol 2022;132(6):1382–1391.
- Fedorowski A, Sutton R. Autonomic dysfunction and postural orthostatic tachycardia syndrome in post-acute COVID-19 syndrome. Nat Rev Cardiol 2023;20(5):281–282.
- World Physiotherapy. Safe rehabilitation approaches for people living with long COVID: physical activity and exercise. London: World Physiotherapy; 2021.
- National Institute for Health and Care Excellence. Myalgic encephalomyelitis (or encephalopathy)/chronic fatigue syndrome: diagnosis and management (NG206). London: NICE; 2021.
- McGregor G, Sandhu H, Bruce J, et al. Clinical effectiveness of an online supervised group physical and mental health rehabilitation programme for adults with post-covid-19 condition (REGAIN study): multicentre randomised controlled trial. BMJ 2024;384:e076506.
- Nopp S, Moik F, Klok FA, et al. Outpatient pulmonary rehabilitation in patients with long COVID improves exercise capacity, functional status, dyspnea, fatigue, and quality of life. Respiration 2022;101(6):593–601.
- Daynes E, Gerlis C, Chaplin E, Gardiner N, Singh SJ. Early experiences of rehabilitation for individuals post-COVID to improve fatigue, breathlessness, exercise capacity and cognition: a cohort study. Chron Respir Dis 2021;18:14799731211015691.
References are numbered in citation order (Vancouver/BMJ style) and were current at the time of writing. Guidelines are living documents — verify against the latest version before clinical use.
More than one of our services applies here, and which combination suits you depends on what your assessment shows.
Clinical evidence
Part 1 covers the same condition without the technical detail. What follows is the evidence base behind it, written for clinicians — the literature, the reasoning and the gaps.
For clinicians: this summary supports clinical reasoning and is not a protocol. Check current guidelines and local policy before applying it, and read it alongside the key references and guidelines directory.
Framing. Post-COVID-19 condition is a symptom-defined diagnosis of exclusion with several distinguishable clinical patterns — breathlessness with deconditioning or breathing pattern disorder, fatigue with post-exertional symptom exacerbation, autonomic dysfunction, and cognitive symptoms — and the pattern determines the prescription.1,2 Getting this wrong in either direction causes harm: withholding rehabilitation from a deconditioned patient prolongs disability, while pushing progressive exercise onto post-exertional symptom exacerbation reliably makes people worse.3
Rehabilitation evidence
- REGAIN — the largest randomised trial to date — found an online supervised group programme combining physical and mental-health rehabilitation improved health-related quality of life, depression and fatigue at three months compared with usual care in adults with post-COVID condition after hospitalisation.4
- Outpatient pulmonary rehabilitation improved exercise capacity, functional status, dyspnoea, fatigue and quality of life in observational cohorts, with the largest gains in those with the worst baseline function.5
- Structured programmes combining exercise, education and breathing retraining improved fatigue, breathlessness and cognition in early service-evaluation data, which is where most of the practical protocols originate.6
- Exercise intolerance is frequently peripheral rather than cardiopulmonary on cardiopulmonary exercise testing — impaired oxygen extraction, deconditioning and hyperventilatory responses rather than cardiac or ventilatory limitation.7
- Where post-exertional symptom exacerbation is present, World Physiotherapy guidance and the NICE ME/CFS guideline both direct symptom-titrated pacing and explicitly caution against fixed incremental exercise programmes.3,8
Mechanism and course
- Breathing pattern disorder is common and treatable, and is one of the highest-yield findings in a long-COVID assessment because it responds to retraining regardless of what else is going on.2
- Autonomic dysfunction, including POTS, is a recognised pattern requiring recumbent and semi-recumbent conditioning, fluid and salt strategies, and compression before upright work.9
- Vaccination before infection reduces the risk of developing the condition, and the population burden has fallen with immunity and changing variants — but prevalence in those already affected remains substantial.10
Physiotherapy implications
- Screen for post-exertional symptom exacerbation before prescribing anything, using symptom-onset timing (typically 12–72 hours after activity) and duration. This single question decides between graded exercise and pacing.3,8
- Screen for orthostatic intolerance with a lying-to-standing observation of heart rate and symptoms, and adjust position and progression accordingly.9
- Assess the breathing pattern formally — rate, ratio, upper-chest dominance, sighing, Nijmegen score — and treat it directly; many patients labelled deconditioned are hyperventilating.2
- Use activity-first, symptom-titrated progression: establish a sustainable baseline, work below the symptom threshold, and progress by consistency before volume or intensity.
- Exclude the mimics before rehabilitating: anaemia, thyroid disease, myocarditis, pulmonary embolism, deconditioned cardiovascular disease, sleep apnoea and depression all present this way.1
- Escalate exertional chest pain, syncope, new desaturation on exertion, or a sustained step-down in function — these are not expected features and need medical review.
- Measure and share: sit-to-stand tests, walking distance, symptom diaries and quality-of-life scores make progress visible in a condition where patients are frequently disbelieved.
Clinical reasoning
- Decide first which pattern dominates — deconditioning, dysfunctional breathing, post-exertional symptom exacerbation, autonomic dysfunction, or a mixture — and prescribe for that, not for the diagnosis label.
- Improvement that reverses after two or three sessions is a dose problem, not a motivation problem; reduce and rebuild.
- Normal investigations do not mean absence of disease, and saying so plainly is part of the treatment.
- Fatigue with a preserved exercise response is a pacing and sleep problem; breathlessness with a normal saturation and a chaotic pattern is a retraining problem.
Evidence gaps
- No trial has yet compared graded exercise against symptom-titrated pacing in phenotyped subgroups — the single most important unanswered question in the field.3
- Most rehabilitation evidence is observational or from hospitalised cohorts, so generalisability to community-managed patients is limited.5,6
- There is no validated phenotyping tool to allocate patients between treatment pathways.
- Long-term trajectory, relapse rate and predictors of recovery remain poorly defined.1
References for the clinical evidence summary
- National Institute for Health and Care Excellence, Scottish Intercollegiate Guidelines Network, Royal College of General Practitioners. COVID-19 rapid guideline: managing the long-term effects of COVID-19 (NG188). London: NICE; 2024.
- Singh SJ, Baldwin MM, Daynes E, et al. Respiratory sequelae of COVID-19: pulmonary and extrapulmonary origins, and approaches to clinical care and rehabilitation. Lancet Respir Med 2023;11(8):709–725.
- World Physiotherapy. Safe rehabilitation approaches for people living with long COVID: physical activity and exercise. London: World Physiotherapy; 2021.
- McGregor G, Sandhu H, Bruce J, et al. Clinical effectiveness of an online supervised group physical and mental health rehabilitation programme for adults with post-covid-19 condition (REGAIN study): multicentre randomised controlled trial. BMJ 2024;384:e076506.
- Nopp S, Moik F, Klok FA, et al. Outpatient pulmonary rehabilitation in patients with long COVID improves exercise capacity, functional status, dyspnea, fatigue, and quality of life. Respiration 2022;101(6):593–601.
- Daynes E, Gerlis C, Chaplin E, Gardiner N, Singh SJ. Early experiences of rehabilitation for individuals post-COVID to improve fatigue, breathlessness, exercise capacity and cognition: a cohort study. Chron Respir Dis 2021;18:14799731211015691.
- Ladlow P, O'Sullivan O, Houston A, et al. Dysautonomia and exercise intolerance in post-COVID-19 syndrome. J Appl Physiol 2022;132(6):1382–1391.
- National Institute for Health and Care Excellence. Myalgic encephalomyelitis (or encephalopathy)/chronic fatigue syndrome: diagnosis and management (NG206). London: NICE; 2021.
- Fedorowski A, Sutton R. Autonomic dysfunction and postural orthostatic tachycardia syndrome in post-acute COVID-19 syndrome. Nat Rev Cardiol 2023;20(5):281–282.
- Ayoubkhani D, Bermingham C, Pouwels KB, et al. Trajectory of long covid symptoms after covid-19 vaccination: community based cohort study. BMJ 2022;377:e069676.
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