Long Covid

Overview

Long Covid (also called post-COVID syndrome) is when symptoms continue after a COVID-19 infection, or start weeks after you felt better, and keep going for a long time. Doctors usually say it is Long Covid when problems last for 4 weeks or more and cannot be explained by another cause. It is not a sign that you are weak or imagining things. It is a real condition that many people experience, and it can affect your body, your thinking, and your mood.

Long Covid is common. Studies suggest that a meaningful share of people who catch COVID-19 go on to have lasting symptoms, though estimates vary a lot depending on how the studies were done and which variant was around. Because so many people have had COVID-19, Long Covid affects a large number of people worldwide, and clinics have been set up in many countries to help.

Anyone who has had COVID-19 can get Long Covid, including children and people who were very fit before. It appears to be more common in adults than in children, and more common in people who were very unwell at the time. But it also happens to people who had a mild illness and never needed to see a doctor.

Symptoms

Common symptoms

• Tiredness that is much worse than usual, and that rest does not fully fix
• Breathlessness, especially when walking, climbing stairs, or talking a lot
• Brain fog: trouble concentrating, remembering things, or finding words
• Cough that lingers, or a tight chest
• Chest pain or a fluttering, pounding, or racing heartbeat
• Feeling dizzy or lightheaded, especially when standing up
• Changes to smell or taste, or food tasting strange
• Headaches and muscle or joint aches
• Sleep problems, such as not sleeping or not feeling rested
• Stomach problems such as nausea, upset stomach, or loss of appetite
• Low mood, anxiety, or feeling easily overwhelmed
• Symptoms that get worse after activity, sometimes a day or two later

Symptoms in children

• Tiredness that affects school, play, or sport
• Headaches and tummy aches
• Trouble concentrating or keeping up at school
• Sleep problems, or feeling more tired in the morning than usual
• Muscle aches and joint pain
• A cough that hangs around, or a sore throat
• Changes in smell or taste, or fussy eating
• Low mood or irritability
• Symptoms often come and go, and most children do improve over time

Symptoms in older adults

• Breathlessness and tiredness that make daily tasks harder
• Muscle weakness and a higher risk of falls
• Memory and concentration problems that can be mistaken for normal ageing
• A flare-up of existing heart, lung, kidney, or diabetes problems
• Loss of appetite, weight loss, or low energy for eating and drinking
• Low mood, loneliness, or loss of confidence
• Losing fitness after weeks of resting, which then makes activity feel harder

Causes

Main causes

• Long Covid is not fully understood, and researchers think there may be several causes rather than just one.
• The virus may leave traces or fragments behind that keep the immune system switched on.
• The immune system, your body's defence against infection, may stay overactive or confused for a while after the infection has gone.
• Inflammation and changes in small blood vessels may affect how blood and oxygen reach organs and muscles.
• Some organs, such as the lungs or heart, may be slower to heal after a severe infection.
• Weeks of rest during and after illness can lower your fitness, which then makes normal activity feel exhausting.

Risk factors

• Having a severe first illness, or being treated in hospital
• Being older, though younger adults and children are affected too
• Having other long-term conditions such as asthma, diabetes, or heart disease
• Having many different symptoms in the first weeks of the illness
• Being very stressed or having poor sleep around the time of the infection
• Being female appears to be linked with a higher chance in several studies, but the reasons are unclear

When to see a doctor

See a doctor urgently if:

• Your breathlessness is getting worse, or you cannot do things you could do a week ago
• You have chest pain, a racing heartbeat, or feel faint
• You have a fever that will not go away
• You feel very low, hopeless, or have thoughts of harming yourself — please seek help the same day
• A child is very tired, not drinking, or breathing fast

Book a routine appointment if:

• Any symptom lasts more than 4 weeks after COVID-19, or keeps coming back
• You are struggling with work, school, caring duties, or everyday tasks
• Your sleep, mood, or memory has changed and is not improving
• You want advice on how to pace yourself and rebuild your strength safely
• You feel you are getting worse rather than slowly better

Diagnosis

There is no single blood test or scan that proves you have Long Covid. Your doctor will usually start by listening to your story: when the infection was, which symptoms you have, how they affect your daily life, and whether they are getting better. They will check your health history and examine you. A key part of the process is ruling out other conditions that can cause similar symptoms, such as anaemia, thyroid problems, or a heart or lung issue.

Tests that may be done

• Blood tests to check for anaemia, thyroid problems, vitamin levels, and signs of inflammation
• Blood pressure and heart rate checks, including standing up, to look for dizziness on standing
• An ECG (a painless recording of your heart's rhythm) if you have palpitations or chest pain
• A chest X-ray or breathing tests if breathlessness or cough is a main problem
• A urine test or other simple checks depending on your symptoms
• Referral to a Long Covid clinic or a specialist, such as a heart, lung, or fatigue specialist, if symptoms are complex

What to expect at your appointment

Expect a conversation rather than a quick answer. Your appointment may be longer than usual, and you may be asked to keep a simple diary of symptoms and activity for a week or two before you go back. Some tests may come back normal. That does not mean your symptoms are not real. It usually means the cause is not yet fully understood and the focus should be on managing symptoms and supporting recovery. Ask your doctor or nurse to write down the plan so you can look at it later when you are tired.

Treatment

There is currently no single medicine that cures Long Covid. Treatment is personal: it aims to ease your particular symptoms, protect your energy, and help you rebuild strength at a pace your body can cope with. Many people are helped by a team, which might include your family doctor, a physiotherapist, an occupational therapist, a nurse, a psychologist, and sometimes a Long Covid clinic.

Self-care at home

• Pace yourself: break tasks into small pieces and rest before you feel completely wiped out
• Try 'little and often' activity, with planned rests in between, rather than bursts of effort
• Keep a simple diary of what you did and how you felt, so you can spot patterns
• Protect your sleep: a regular bedtime, a dark quiet room, and less screen time before bed
• Drink water regularly through the day and eat regular, balanced meals
• Sit down for tasks like showering, dressing, or cooking when you can
• Ask for and accept practical help from family, friends, or colleagues
• Avoid pushing through heavy tiredness, which often leads to a crash afterwards
• Write things down, set reminders, and reduce background noise if concentration is hard
• Go back to work or study gradually, and talk to your employer or school about adjustments

Medical treatments

Your doctor will treat the problems you actually have. That might include help with breathing, physiotherapy to rebuild strength safely, talking therapies for low mood or anxiety, advice on sleep, or medicines for specific issues such as headaches or an overactive heart rate if tests show that is happening. Some people need help with dizziness when standing, or support from a dietitian. Any treatment should be discussed with you, started at a low level, and reviewed regularly so it can be adjusted if it is not helping. Never start or stop a medicine without speaking to your doctor or pharmacist first.

When is surgery considered?

Surgery is not a treatment for Long Covid itself. Occasionally, tests done because of your symptoms find a separate problem that does need a procedure or operation, and your medical team would discuss that with you in detail.

Living with this condition

Living with Long Covid often means rethinking how you use your energy. Many people find it helpful to plan the week with a mix of activity, rest, and things that lift their mood, and to keep the 'must-do' list short. It is normal to feel frustrated when your body will not do what it used to. Try to measure progress over weeks rather than days, and count small wins, such as sitting up for longer or walking to the end of the road. Tell the people around you what helps and what does not, so they can support you in the right way.

Lifestyle tips

• Keep a steady daily routine with regular meals, fluids, and rest breaks
• Build activity back slowly, and stop or ease off if symptoms flare a day or two later
• Spend some time outdoors or by a window each day, if you can, for light and fresh air
• Limit alcohol and caffeine, especially if sleep or heart rate is a problem
• Stay connected with at least one person you trust, even on low-energy days
• Ask about adjustments at work, such as shorter hours, rest breaks, or working from home
• Keep a symptom diary to share with your doctor rather than relying on memory

Diet and exercise

There is no special diet that cures Long Covid. Eating regular, balanced meals with plenty of vegetables, some protein, and slow-release carbohydrates can help steady your energy. Drink water regularly, and have small snacks if your appetite is poor. Gentle movement is usually helpful, but the key word is gentle. Short walks, light stretching, breathing exercises, or chair-based activity are good starting points. Build up slowly and rest before you are exhausted. If your symptoms get worse a day or two after activity, ease back and speak to a physiotherapist or your doctor about finding your safe level.

Mental health and emotional wellbeing

Long Covid can be emotionally hard. Feeling exhausted, foggy, and unable to do normal things can bring frustration, worry, low mood, or grief for your old life. These feelings are understandable and very common, not a sign of weakness. Talking therapies, peer support, and simple stress-reduction techniques can help. If you ever feel hopeless or have thoughts of harming yourself, please reach out straight away to your local emergency number or a crisis line in your country, or tell someone you trust and ask them to stay with you while you get help. You deserve support, and you do not have to cope alone.

Prevention

You cannot fully guarantee that you will avoid Long Covid, but you can lower your risk. The best-known way is to reduce your chance of catching COVID-19 and of becoming very unwell with it: staying up to date with recommended vaccines, washing your hands, ventilating rooms, and staying away from others when you are ill all help. If you do get COVID-19, resting properly in the early days rather than rushing back to full activity may help your recovery.

Vaccines

COVID-19 vaccines are recommended in many countries and are very effective at lowering the chance of severe illness and hospital care. Some studies suggest vaccination may also lower the chance of Long Covid, though the evidence is not yet settled and it is not a guarantee. Ask your doctor or pharmacist whether you are due a booster, especially if you are older, pregnant, or have a long-term condition.

Screening programmes

There is no screening test for Long Covid. The focus is on noticing symptoms early and getting them checked, rather than testing people who feel well.

Complications

If left untreated

• Long-lasting tiredness that makes work, study, or caring harder
• Loss of fitness and muscle strength from weeks of low activity
• Low mood, anxiety, or loneliness, which can then make other symptoms feel worse
• Money and job worries if you cannot work as before
• Undiagnosed problems, such as anaemia or a heart or lung issue, being missed
• Strain on relationships and family life

Long-term outlook

The honest and hopeful answer is that most people with Long Covid do improve over time. Recovery is often slow, and it can be uneven, with good stretches and set-backs. Some people recover fully in weeks or months, while others need longer and may have some lasting symptoms. Getting checked, pacing yourself, and accepting support all make a real difference. Many people find they gradually get back to the things that matter to them, even if the path is not a straight line.

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