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    Timeline of COVID Symptoms

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    1. COVID-19 symptoms 
    2. How long before COVID symptoms start? 
    3. How soon after exposure to COVID-19 can I be tested? 
    4. How long do COVID symptoms last? 
    5. How long are you contagious with COVID? 
    6. Post COVID symptoms 

    Man in mask with fever

    Updated 24th February 2022 - for the most up to date coronavirus (COVID-19) guidance and information, please visit the NHS or government’s dedicated pages. This advice may differ in Wales, Scotland and Northern Ireland

    While it might feel like we’ve been living with COVID-19 for a long time, it is still a relatively new disease. For this reason, and the fact people can have very different reactions to the virus, we’re constantly learning more about it. This makes it hard for us to give answers to some of the key questions people ask about symptoms, how long they take to show, how long people are infectious for and how long they last.

    In this article we’re going to take a look at an estimated timeline of a COVID-19 infection, when people are most contagious and how long people can expect symptoms to typically last. 

    COVID-19 symptoms 

    We’ve had the symptoms of COVID-19 drilled into us since the start of the pandemic, but it’s worth reminding ourselves that the key symptoms are still: 

    • A high temperature 
    • A new, continuous cough 
    • A loss or change to your sense of smell or taste. 

    Public Health England (PHE) say about 85% of people with COVID-19 will have at least one of these three symptoms. Other common symptoms include breathlessness, tiredness and aches and pains.

    We also can’t forget that many people are asymptomatic. It’s thought that between 17% and 20% of people with the virus have no symptoms at all. 

    Timeline of COVID symptoms 

    How long before COVID symptoms start? 

    The time between getting infected with a disease and starting symptoms is known as the incubation period. The incubation period for COVID-19 is between 2 and 14 days. But the average time before showing symptoms is thought to be 5 days. This is based on a study done in Wuhan, China, where the pandemic started. The study found that the median incubation period was 5.1 days and that 97.5% of people with symptoms will develop these within 11.5 days. 

    The day you develop symptoms is classed as ‘day 0’ of your infection.

    How soon after exposure to COVID-19 can I be tested? 

    If you’ve been in contact with someone who’s tested positive, you might want to take a lateral flow test to see if you have COVID-19 too. 

    Taking a test after exposure to COVID-19 proves that you do not have COVID-19 on the day you get tested, but it doesn’t mean you can’t develop it later

    We know that incubation periods vary depending on the person, so it is possible to get tested too early after exposure. 

    How long do COVID symptoms last? 

    The Kings College and ZOE symptom study suggests that the majority of people recover from COVID-19 within 2 weeks, but that 1 in 10 people still have symptoms after three weeks. 

    People with severe COVID-19 symptoms typically follow a pattern which begins with loss of taste and/or smell, fever, and cough in the first couple of days. This cough then develops into severe respiratory symptoms which can require hospital treatment around a week after their symptoms started.

    How long are you contagious with COVID? 

    How infectious someone is depends on how much virus they’re carrying and how much of this virus is able to multiply.  

    An extensive study in the Lancet Microbe has found that people are most likely to pass on COVID-19 during the first five days of symptoms starting. The study found that the amount of active virus (virus that can replicate) in people’s throat particles peaked in the first 5 days from symptoms starting. No active virus was found after 9 days of symptoms starting, so it’s unlikely that the majority of these people would be very infectious beyond those 9 days.

    Post COVID symptoms 

    For some people, COVID-19 can cause symptoms which last weeks or months after the infection has gone. This is known as post-COVID-19 syndrome or long COVID.

    Most people will recover from COVID in a couple of weeks, but for some people this recovery process might take longer. There seems to be no link between how ill people are with the COVID and their chances of experiencing long COVID. 

    Common symptoms of long COVID include: 

    • Fatigue 
    • Shortness of breath 
    • Tight chest 
    • Problems with memory and/or concentration 
    • Insomnia 
    • Heart palpitations 
    • Dizziness 
    • Pins and needles 
    • Aches and pains 
    • Anxiety  
    • Depression 
    • Tinnitus 
    • Feeling sick, diarrhoea, stomach aches, loss of appetite

    Some people also experience some of the symptoms associated with the COVID-19 infection, such as, a high temperature, cough, headaches, sore throat, changes to sense of smell or taste.

    Find out more about long COVID

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    References 
    https://www.bbc.co.uk/news/health-51048366 
    https://www.nhs.uk/conditions/coronavirus-covid-19/self-isolation-and-treatment/when-to-self-isolate-and-what-to-do/
    https://www.nhs.uk/conditions/coronavirus-covid-19/symptoms/
    https://www.bmj.com/content/371/bmj.m4851
    https://www.theguardian.com/world/2020/nov/29/getting-tested-for-covid-19-need-to-know  
    https://patient.info/news-and-features/coronavirus-how-quickly-do-covid-19-symptoms-develop-and-how-long-do-they-last
    https://www.acpjournals.org/doi/10.7326/M20-0504
    https://www.gov.uk/government/publications/guidance-for-contacts-of-people-with-possible-or-confirmed-coronavirus-covid-19-infection-who-do-not-live-with-the-person
    https://covid.joinzoe.com/post/covid-long-term
    https://www.bbc.co.uk/news/health-55006313
    https://www.thelancet.com/journals/lanmic/home 

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