Long COVID
Long COVID (post-COVID syndrome) describes new or ongoing symptoms lasting 12 weeks or more after a COVID-19 infection, most commonly fatigue, breathlessness, brain fog and post-exertional symptom flare-ups. It can affect almost any body system and varies widely between individuals. There is currently no single test that confirms Long COVID. Diagnosis is based on clinical assessment, symptom history and excluding other possible causes. Most people improve gradually with appropriate pacing and personalised support.
This information is intended for educational purposes and should not replace professional medical advice. If you have new, severe or worsening symptoms, always seek advice from your GP or specialist healthcare team.
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KEY FACTS
✔ Long COVID describes symptoms that continue or develop 4 weeks or more after a COVID-19 infection. Post-COVID-19 syndrome refers specifically to symptoms lasting 12 weeks or longer that cannot be explained by another diagnosis.
✔ It can occur after mild, moderate or severe COVID-19, including infections that did not require hospital treatment.
✔ Symptoms vary widely and commonly include fatigue, post-exertional malaise (PEM), breathlessness, brain fog, muscle and joint pain, dizziness and palpitations.
✔ There is currently no single diagnostic test. Diagnosis is based on clinical assessment, symptom history and excluding other possible causes.
✔ Long COVID is increasingly recognised as a condition involving multiple body systems, including the immune, nervous, cardiovascular and cellular energy systems.
✔ Recovery is highly individual. Many people improve gradually, although progress is often non-linear, with periods of improvement interrupted by temporary flare-ups.
✔ Management focuses on education, pacing, symptom management and multidisciplinary support, tailored to each person's presentation.
UNDERSTANDING THE CONDITION
Long COVID is the commonly used term for symptoms that continue or develop after a COVID-19 infection. UK guidance distinguishes ongoing symptomatic COVID-19 (symptoms lasting between 4 and 12 weeks) from post-COVID-19 syndrome (symptoms persisting for 12 weeks or longer that cannot be explained by another diagnosis). In everyday practice, the term Long COVID is commonly used to describe both.
Long COVID is now recognised as a common consequence of COVID-19 infection. It can occur after infections of any severity, including mild illness that did not require hospital treatment.
Rather than representing a single illness, Long COVID is increasingly recognised as a spectrum of overlapping clinical presentations. Symptoms may affect almost every body system and vary considerably from one person to another. Some people experience predominantly breathlessness and cardiovascular symptoms, while others are mainly affected by profound fatigue, cognitive difficulties or widespread pain.
A distinctive feature for many people is post-exertional malaise (PEM)—a delayed worsening of symptoms following physical, mental or emotional activity. Unlike ordinary tiredness, PEM may not appear until several hours or even one or two days after exertion, and recovery may take several days or longer.
Long COVID is not a sign of ongoing active infection. Instead, current research suggests that it reflects persistent biological changes affecting several body systems, including the immune system, autonomic nervous system, blood vessels and cellular energy production. These changes help explain why symptoms cannot simply be overcome by determination or increased exercise.
For most people, symptoms gradually improve over time, although recovery is highly individual and rarely follows a straight line. Periods of improvement are often interrupted by temporary setbacks, particularly after exceeding the body's current capacity.
COMMON SYMPTOMS
Long COVID can affect almost every organ system. Some people experience only one or two persistent symptoms, while others develop a complex combination that fluctuates over time. The severity of symptoms does not necessarily reflect the severity of the initial COVID-19 infection.
Typical Symptoms
Persistent fatigue that does not fully improve with rest
Breathlessness or reduced exercise tolerance
Post-exertional malaise (PEM)
Brain fog (difficulty concentrating, thinking clearly or finding words)
Other Symptoms
Palpitations or a rapid heart rate, particularly when standing
Chest pain or chest tightness
Muscle and joint pain
Headaches
Dizziness or light-headedness
Sleep disturbance
Loss or change of smell and taste
Digestive symptoms
Anxiety or low mood associated with chronic illness
Symptoms Vary Between Individuals
No two people experience Long COVID in exactly the same way.
Some notice breathlessness and cardiovascular symptoms as their main problem, while others are more affected by fatigue, cognitive difficulties or post-exertional malaise. Many experience symptoms affecting several body systems simultaneously.
Symptoms commonly fluctuate, with periods of improvement followed by setbacks. These flare-ups are often triggered by physical activity, prolonged concentration, emotional stress, another illness or even everyday tasks that would previously have seemed insignificant.
Recognising your own symptom pattern and identifying your personal exertion threshold are often key steps towards successful long-term management.
CAUSES, MECHANISMS AND DIAGNOSIS
Why Does It Happen?
The exact mechanisms behind Long COVID are still being actively researched, but a growing body of evidence suggests that several biological processes contribute simultaneously rather than there being a single cause.
One important mechanism currently being investigated involves the renin–angiotensin system (RAS), the hormonal system that helps regulate blood pressure, blood vessel tone, fluid balance and inflammation throughout the body.
SARS-CoV-2 enters human cells by attaching to a protein called angiotensin-converting enzyme 2 (ACE2). Under normal circumstances, ACE2 helps maintain a healthy balance within the RAS by limiting the effects of angiotensin II, a hormone that promotes blood vessel constriction and inflammation. Following COVID-19 infection, this protective balance may remain disrupted in some individuals, even after the virus has been cleared.
Because the RAS influences the cardiovascular system, lungs, kidneys and blood vessels, persistent dysregulation may contribute to symptoms such as:
breathlessness
palpitations
dizziness
exercise intolerance
altered blood pressure regulation
It may also contribute to the endothelial dysfunction and microvascular abnormalities that have been reported in some people with Long COVID.
Alongside this, several other biological mechanisms are being investigated, including:
persistent immune activation
low-grade inflammation
autonomic nervous system dysfunction
altered muscle metabolism
impaired cellular energy production (mitochondrial dysfunction)
Together, these mechanisms may help explain why physical or mental exertion can trigger delayed symptom flare-ups and why recovery can be slow.
Recent studies using muscle biopsies have demonstrated measurable metabolic and structural abnormalities in people who experience post-exertional malaise, reinforcing that these symptoms reflect genuine biological changes rather than simple deconditioning or anxiety.
Several factors have been associated with an increased likelihood of developing Long COVID, although no single factor reliably predicts who will be affected.
Importantly, Long COVID is not a sign that the original infection remains active, nor is it caused by a lack of fitness, motivation or effort. This distinction matters because advice that may be appropriate for other conditions—such as pushing through fatigue or steadily increasing exercise—can worsen symptoms in people who experience post-exertional malaise.
How It Is Diagnosed
There is currently no single blood test, scan or biopsy that confirms Long COVID.
Diagnosis is based on a clinical assessment that considers:
previous COVID-19 infection
new or persistent symptoms
symptom duration
exclusion of alternative diagnoses
Your GP or specialist may recommend investigations such as blood tests, chest imaging, lung function tests, ECG or other heart investigations to exclude alternative medical conditions or identify complications requiring specific treatment.
Current UK guidance recommends a holistic, person-centred assessment that considers not only which symptoms are present, but also:
how symptoms fluctuate over time
whether physical or mental exertion triggers deterioration
the impact on work and daily activities
sleep, mental wellbeing and quality of life
any associated medical conditions
As Long COVID can affect multiple body systems simultaneously, understanding how these symptoms interact is often as important as identifying each symptom individually. This broader perspective helps guide a more personalised management plan.
HOW IS IT USUALLY MANAGED?
Management depends on the diagnosis, symptom severity, underlying mechanisms and each person's individual circumstances.
There is currently no single treatment that cures Long COVID. Management focuses on understanding the individual's symptoms, identifying treatable complications and supporting recovery through a personalised, multidisciplinary approach.
Education
Understanding your condition is one of the most important parts of recovery.
Learning to recognise post-exertional malaise, identify early warning signs of a flare and understand your personal activity limits often helps reduce unnecessary setbacks and improves confidence in day-to-day management.
Physical Rehabilitation
Long COVID differs importantly from many other chronic conditions.
For people who experience post-exertional malaise (PEM), NICE no longer recommends graded exercise therapy, as increasing activity to predetermined targets may worsen symptoms.
Instead, the recommended approach is pacing—matching activity to your current capacity, allowing adequate recovery and avoiding repeated symptom flare-ups.
For people who do not experience post-exertional malaise, a gradual return to activity may be appropriate, but rehabilitation should always be individualised and regularly reviewed.
Medication
There is currently no medication that cures Long COVID itself.
However, medicines may be used to help manage individual symptoms such as:
pain
headaches
palpitations
sleep disturbance
dizziness
associated medical conditions
Treatment should always be guided by your GP or specialist according to your individual clinical presentation.
Psychological Support
Living with a fluctuating long-term condition can have a significant emotional impact.
Psychological support may help people:
adapt to changes in daily life
develop practical coping strategies
manage uncertainty
reduce anxiety associated with chronic illness
improve confidence during recovery
This support complements—not replaces—the management of the physical condition.
Specialist Care
Many people are successfully managed through primary care.
Referral to specialist Long COVID or multidisciplinary rehabilitation services may be appropriate when symptoms are complex, severe, involve multiple body systems or significantly affect daily function.
Successful management often combines medical assessment, symptom-specific treatment, appropriate pacing, lifestyle measures and regular review as recovery progresses.
LIVING WELL WITH THE CONDITION
Impact on Daily Life
Living with Long COVID often requires adapting to a condition that can fluctuate from day to day.
Symptoms may improve for a period before returning unexpectedly, making it difficult to predict what you will be able to do from one day to the next.
Understanding these fluctuations, rather than fighting against them, is often an important step towards achieving greater stability.
Pacing and Energy Management
For people who experience post-exertional malaise (PEM), pacing is one of the most effective self-management strategies.
Unlike "building up fitness", pacing involves working within your current energy envelope—balancing activity with adequate recovery to reduce the risk of symptom flare-ups.
This applies not only to physical activity but also to:
mental concentration
computer work
reading
emotional stress
social activities
sensory stimulation such as noise or bright environments
Many people find it helpful to spread demanding activities throughout the week rather than completing everything on days when they feel better.
Sleep and Recovery
Sleep disturbance is common in Long COVID and may contribute to fatigue, poor concentration and reduced resilience.
Helpful strategies include:
maintaining regular sleep and waking times
allowing time to wind down before bed
avoiding excessive physical or mental activity late in the evening
discussing persistent sleep problems with your healthcare professional
Improving sleep may not eliminate symptoms completely but often supports overall recovery.
Work and Daily Activities
Returning to work or normal daily routines is often one of the biggest challenges.
Many people benefit from temporary adjustments such as:
phased return to work
flexible working hours
home working where possible
regular rest breaks
reducing physically demanding tasks
simplifying daily routines during periods of increased symptoms
Because Long COVID symptoms are often invisible, explaining the condition to employers, family members and friends can help improve understanding and support.
Managing Flare-Ups
Periods of symptom worsening are common and do not necessarily mean the condition is deteriorating permanently.
Many flare-ups occur after exceeding your current activity limits.
Recognising early warning signs, reducing activity promptly and allowing adequate recovery often shortens the duration of a setback and helps avoid prolonged crashes.
Looking After Your Wellbeing
Living with Long COVID can affect confidence, independence and emotional wellbeing.
Many people experience frustration, uncertainty or isolation, particularly when symptoms are poorly understood by others.
Looking after your mental wellbeing is an important part of recovery and may include:
maintaining social connections where possible
setting realistic goals
celebrating gradual progress
seeking support when needed
remembering that recovery is rarely a straight line
HOW ROWAN HEALTH SUPPORTS YOU
Every person experiences Long COVID differently.
Some are mainly affected by post-exertional malaise, while others experience autonomic dysfunction, breathlessness, cognitive difficulties, persistent pain or a combination of symptoms.
At Rowan Health, our assessment aims to identify your individual clinical presentation, rather than treating every person with Long COVID in the same way.
During your initial consultation, we assess:
your symptom pattern
exertion sensitivity
possible post-exertional malaise
medical history
lifestyle
previous investigations
the impact of symptoms on work, family life and daily activities
This allows us to develop a personalised supportive care programme that complements your NHS or specialist care.
Depending on your individual needs, your programme may include:
education and self-management strategies
personalised pacing and activity planning
nutritional and lifestyle guidance
symptom monitoring
return-to-work support where appropriate
selected integrative interventions, including medical acupuncture, homeopathy, herbal medicine, manual therapy or neuro-coaching
Our aim is not simply to reduce symptoms, but to help you better understand your condition, improve your daily function and support your recovery while working alongside your conventional healthcare team.
When to Seek Medical Advice
Although Long COVID itself is not usually a medical emergency, you should seek prompt medical assessment if you develop:
new or worsening chest pain
severe or rapidly worsening breathlessness
fainting or repeated blackouts
severe palpitations with dizziness
coughing up blood
persistent fever or signs of infection
unexplained weight loss
new weakness, numbness or difficulty speaking
confusion or altered consciousness
If you experience severe chest pain, sudden difficulty breathing, signs of stroke or any other medical emergency, call 999 immediately.
If your symptoms are severe, rapidly worsening or causing immediate concern, contact NHS 24 on 111. In a medical emergency, call 999 or attend your nearest Accident & Emergency department.
FAQs
Is Long COVID a recognised medical condition?
Yes. Long COVID (including post-COVID-19 syndrome) is recognised by NICE, the NHS and the World Health Organization, with national guidance supporting its diagnosis and management.
Will I recover?
Many people gradually improve, particularly with appropriate pacing and supportive care. Recovery varies considerably between individuals, and while some recover within months, others experience symptoms for longer.
Why do I experience palpitations or dizziness, particularly when standing?
These symptoms may be related to changes affecting the autonomic nervous system and the renin–angiotensin system (RAS), both of which help regulate heart rate, blood pressure and blood vessel tone. Ongoing research suggests these systems may remain altered in some people following COVID-19 infection, contributing to dizziness, palpitations and reduced exercise tolerance.
Should I exercise if I have Long COVID?
If you experience post-exertional malaise, increasing activity too quickly may worsen symptoms. Current NICE guidance recommends an individualised pacing approach rather than graded exercise therapy for people with PEM.
Is Long COVID the same as ME/CFS?
No. They are different conditions, although they share many features, particularly fatigue and post-exertional malaise. Some people with Long COVID later fulfil the diagnostic criteria for ME/CFS.
Can Long COVID occur after a mild infection?
Yes. Long COVID can develop after COVID-19 infections of any severity, including mild illness that did not require hospital treatment.
Does Long COVID mean the virus is still active?
Current evidence suggests that Long COVID reflects the body's response following infection rather than an ongoing active infection.
Sources & references
National Institute for Health and Care Excellence (NICE), Scottish Intercollegiate Guidelines Network (SIGN) & Royal College of General Practitioners (RCGP). COVID-19 Rapid Guideline: Managing the Long-term Effects of COVID-19 (NG188). Updated 2024.
National Health Service (NHS). Long-term Effects of COVID-19 (Long COVID). NHS England. Updated regularly.
World Health Organization (WHO). Post COVID-19 Condition (Long COVID). Clinical Case Definition and Patient Information.
National Institute for Health and Care Excellence (NICE). Myalgic Encephalomyelitis (or Encephalopathy)/Chronic Fatigue Syndrome: Diagnosis and Management (NG206). 2021.
Ely EW, Brown LM, Fineberg HV. Long COVID Defined. New England Journal of Medicine. 2024;391:1746–1753.
Davis HE, McCorkell L, Vogel JM, Topol EJ. Long COVID: Major Findings, Mechanisms and Recommendations. Nature Reviews Microbiology. 2023;21:133–146.
Appelman B, Charlton BT, Goulding RP, et al. Muscle Abnormalities Worsen After Post-Exertional Malaise in Long COVID. Nature Communications. 2024;15:17.
Yong SJ. Long COVID and Post-Infectious Disease: Current Concepts and Biological Mechanisms. Nature Reviews Microbiology. 2024.
Mancini DM, Brunjes DL, Lala A, et al. Use of Cardiopulmonary Stress Testing for Patients with Unexplained Exercise Intolerance Following COVID-19. JACC: Heart Failure. 2021;9(12):927–937.
Nopp S, Moik F, Klok FA, et al. Practical Recommendations for Exercise Training in Patients with Long COVID with or without Post-Exertional Malaise: A Best Practice Proposal. Sports Medicine – Open. 2024;10:14.
Moula AI, et al. The Pathophysiology of Long COVID Throughout the Renin–Angiotensin System. Molecules. 2022;27(9):2903.
Sasidharan S, et al. Role of the Renin–Angiotensin System in Long COVID's Cardiovascular Injuries. Biomedicines. 2023;11(7):2004.
Clinical Review
Clinical content reviewed by
Rowan Health
Last reviewed:
22 July 2026
Related Resources
If you would like to learn more about Long COVID and related topics, the following pages may be helpful:
Related Conditions
Myalgic Encephalomyelitis / Chronic Fatigue Syndrome (ME/CFS) >
Related Symptoms
Brain Fog
Persistent Fatigue
Breathlessness
Sleep Problems
Chronic Pain
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Living with Long COVID can affect many aspects of daily life, from work and family responsibilities to physical activity and emotional wellbeing. Because symptoms vary considerably between individuals, effective support begins with understanding your unique clinical presentation and how the condition is affecting you.
At Rowan Health, we provide personalised supportive care programmes designed to complement your existing medical care. Following a comprehensive assessment, we develop an individualised management plan tailored to your symptoms, priorities and recovery goals.
If you would like to explore whether our approach may be suitable for you, you can arrange a comprehensive initial consultation or book a free 10-minute discovery call to discuss your situation before making an appointment.