What is critical illness cover?

Learn about critical illness cover. Find out what it is and how it works. And discover the benefits of Tesco Life Insurance.

Published: 11 February 2026

Two adults and a child smiling together in a cheerful kitchen, with plates and utensils in the background.

What is critical illness insurance?

Critical illness cover is insurance that pays out a tax-free lump sum if:

  • you’re diagnosed with a critical illness during the term of the policyyou’re diagnosed with a critical illness during the term of the policy
  • your illness is covered by the policyyour illness is covered by the policy

You can make a claim if you survive for a set time after meeting the conditions of the policy. And you can use the lump sum to help with the cost of medical treatment, a mortgage or paying the bills while you’re not working.

Critical illness cover is designed to support you and your family financially, so you can focus on your treatment and recovery. It doesn’t pay out if you die - that’s where life insurance could help.

It’s also worth noting that critical illness cover isn’t a savings or investment plan. It’ll only pay out if you make a successful claim.

    What does critical illness insurance cover?

    Critical illness insurance usually covers a range of different illnesses. For example:

    • invasive cancerinvasive cancer
    • heart attackheart attack
    • strokesstrokes
    • dementiadementia
    • motor neurone diseasemotor neurone disease
    • organ failure and transplantorgan failure and transplant
    • multiple sclerosismultiple sclerosis

    How does critical illness cover work?

    You can take out critical illness cover on its own or with a life insurance policy. With Tesco Insurance you will need to buy it with a life insurance plan. You decide:

    • how much cover you needhow much cover you need
    • how long you want the policy to lasthow long you want the policy to last
    • whether you want level cover or decreasing coverwhether you want level cover or decreasing cover

    When deciding on your cover, it’s worth thinking about whether you’re paying a mortgage, childcare or other regular expenses. And who you need to support if you’re unable to work.

      What is level cover?

      For level cover, you decide the cover amount and how long you want to be covered for. And you’ll pay the same monthly premium throughout the policy term.

      Level cover can help you with things like living expenses while you’re off work.

      You can choose to increase your cover with inflation. If you do, your monthly payment and cover will go up over time.

        What is decreasing cover?

        With decreasing cover, the value of your cover goes down over time. But your monthly premiums stay the same throughout the policy term.

        Decreasing cover can help you with monthly debts that reduce over time, like a repayment mortgage.

        At Tesco Insurance we only offer level cover.

          Why get critical illness cover?

          51% of Brits think their loved ones would need more than £1,000 a month to cover financial costs if something happened to them, according to our research.*

          Critical illness cover can help to give you peace of mind and financial support during a difficult time. Especially if you’re the main breadwinner in your household and you’re unable to work.

            Help to protect your loved ones with life insurance

            It’s also worth highlighting that 80% of people say they don’t have savings set aside for their future.* So it might be worth thinking about life insurance, in case you can’t be there to provide for your family in the future.

            If you’re new to life insurance, you could take a look at our beginner’s guide - What is life insurance?

              What affects the cost of critical illness cover?

              Monthly premiums can vary depending on your personal circumstances. The amount of cover will affect how much you pay. And your insurance provider will take a number of other things into account. Including:

              Age - The older you are, the higher the premiums will be. As you age, you also have more risk of developing a critical illness. That makes your cover more expensive.

              Health - including your height, weight, medical history, family medical history and more. If you’re at risk of critical illness because of an existing medical condition, you might not be able to get cover. Or you might have to pay a higher premium.

              Lifestyle - Smoking can increase your chances of becoming critically ill. Drinking a lot of alcohol can also increase your risk and mean you’ll pay a higher premium.

              Occupation - Having a high-risk job can mean there’s more chance of you getting a physical injury or critical illness. That can increase the cost of your cover.

                Do I need critical illness cover?

                Whether you need critical illness cover or not depends on your own circumstances. But here are some reasons why it might be good to have.

                  Main income earner

                  If you’re the only one in your family earning an income, you might want to think about critical illness cover. If you become critically ill, a lump sum payout could help you with medical care and living expenses.

                  Our research shows that 29% of Brits admit ‘their partner’s ability to manage alone’ is their biggest financial worry for when they die.* So it’s worth thinking about financial protection - for you and your loved ones.

                    Self-employed

                    If you’re self-employed, you might not have the same benefits as working for a large company. Things like sick pay, annual leave or private healthcare. Having critical illness cover can help you to pay the bills while you’re not working.

                      Lack of savings

                      If you become critically ill, critical illness cover can help you to meet monthly expenses if you don’t have enough savings to fall back on.

                        Financial obligations

                        It might be worth thinking about critical illness cover if you have any financial obligations - like a mortgage, rent or childcare. A lump sum could help you cover these costs if you become critically ill.

                          Financial support for treatment

                          Critical illness cover can also help to give you financial support while you’re getting medical care. A lump sum could remove some of your worries and help you to focus on your recovery.

                            How much critical illness cover do I need?

                            The amount of critical illness cover you need depends on your personal circumstances.

                            Think about your monthly expenses, and what you’d still need to pay out if you weren’t able to work. So, things like your mortgage, living expenses and childcare or education costs.

                            To make sure you and your loved ones have financial protection for different circumstances, you could get critical illness cover along with life insurance. The policies would be separate, so they could both pay out.

                              How is critical illness different from terminal illness?

                              The main difference between critical and terminal illness is how serious the condition is. A critical illness is a serious condition, but you can usually recover from it. If you have a terminal illness, it’s incurable and you’re likely to die from it.

                              It’s worth knowing that life insurance doesn’t just pay out a lump sum to your loved ones if you die. It can sometimes pay you a lump sum if you’re diagnosed with a terminal illness.

                              To be considered terminally ill, your doctor needs to confirm that:

                              • your illness can’t be curedyour illness can’t be cured
                              • you have less than 12 months to liveyou have less than 12 months to live
                              • all treatment options have been exploredall treatment options have been explored

                              If your condition doesn’t meet the criteria for a terminal illness claim under your life insurance policy, you might be able to claim on your critical illness cover. But only if your condition is covered by your policy.

                                About our research

                                *Based on Tesco Insurance “life insurance research

                                  Important information

                                  About Tesco Life Insurance

                                  Tesco Life Insurance is arranged, administered and underwritten by Aviva Life & Pensions UK Limited.

                                  Tesco Personal Finance Ltd acts as an introducer to Aviva Life & Pensions UK Limited which is authorised by the Prudential Regulation Authority and regulated by the Financial Conduct Authority and the Prudential Regulation Authority. Member of the Association of British Insurers. Firm Reference Number 185896.

                                  Aviva Life & Pensions UK Limited. Registered in England & Wales No. 3253947. Registered Office: Aviva, Wellington Row, York, YO90 1WR. Tesco Personal Finance Ltd and Aviva Life & Pensions UK Limited. are not part of the same corporate group.

                                    About Tesco Insurance

                                    Tesco Insurance is a trading name of Tesco Personal Finance Ltd, Registered Office: 2 South Gyle Crescent, Edinburgh, EH12 9FQ (registered in Scotland, no SC173199) which is authorised and regulated by the Financial Conduct Authority (register no. 186022).

                                      Aviva DigiCare+ app

                                      With the Aviva DigiCare+ app, you can start using a range of health and wellbeing services when you take out your policy.

                                      Members of your family can use it too, as long as they're eligible.

                                      The Aviva DigiCare+ app is provided by Square Health. The services are provided by Square Health and other selected partners.

                                      You'll find full details about the services in the app, along with the terms and conditions, residency restrictions and privacy policy.

                                        Aviva DigiCare+ is a non-contractual benefit that could be changed or withdrawn by Aviva at any time. So, it won't appear in any contract you've signed, or in any terms and conditions.

                                          Life Insurance policy booklets

                                          Please check the policy documents to make sure the cover you’ve chosen meets your needs.

                                          The policy booklet and product information documents tell you about the benefits, limitations and exclusions that’ll apply to your cover.

                                            Tesco Life Insurance is provided, administered and underwritten by Aviva Life & Pensions UK Limited.

                                            Aviva have a 5-star rating for life insurance from Defaqto. And they pay out on 98.8% of life insurance claims*.

                                            *Aviva UK individual claims report 2025, based on claims paid in 2024.

                                              Learn more about Life Insurance

                                              Find the right cover to give financial support to your family after you’ve gone. Tesco Life Insurance comes with Clubcard Prices for Clubcard members, some great Tesco shopping benefits and Aviva DigiCare+.

                                              Life insurance guides

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                                              When should you get life insurance?

                                              How much does life insurance cost?

                                              What is decreasing term life insurance?

                                              Can you have more than one life insurance policy?

                                              What are the benefits of life insurance?

                                              How much life insurance do I need?

                                              What is life insurance?

                                              What does life insurance cover?

                                              Do you need life insurance for a mortgage?

                                              Types of life insurance explained

                                              Life insurance glossary