Chickenpox

Expert review by:
  • Dr Lewis Caplin, Lead Physician at Bupa

Chickenpox is a viral infection that spreads very easily. This is usually by direct contact or via droplets in the air. The condition is most common in children. It causes an itchy rash with small blisters, and can make you feel unwell.

About chickenpox

Chickenpox is a common infection caused by the varicella-zoster virus. Children under 10 years are most likely to catch chickenpox. But you can get it at any age if you haven’t had it before.

The chickenpox virus is very contagious. It spreads easily through the air when you cough or sneeze. Or you can catch it if you touch infected surfaces or blisters. When someone gets chickenpox, it’s very likely that everyone in the same household will catch it too, if they haven’t had it before. You can catch chickenpox at any time of the year, but it’s most common in the late winter and spring.

For most people, chickenpox isn’t serious. You’ll probably feel better after a week or so. The infection can be more serious for certain people, like newborn babies or pregnant women. See our Complications section for more information.

If you’ve had chickenpox, the varicella zoster virus will stay in your body for the rest of your life. This doesn’t cause any symptoms or do you any harm. But in around one in three people, the virus reactivates (wakes up) later in life. This can trigger shingles, causing a rash and nerve pain.

You cannot catch shingles – you have to already have the virus in your body. But if you’ve never had chickenpox, you can catch this from someone with shingles.

Symptoms of chickenpox

Chickenpox symptoms generally begin 10 to 21 days after you’re infected – so at the end of the chickenpox incubation period. But some people start to feel unwell before the rash begins. This is more likely in teenagers and adults, with symptoms such as:

  • aching muscles
  • headache
  • sore throat
  • feeling sick
  • loss of appetite

The main chickenpox symptoms are an itchy rash, and a raised temperature for two or three days. The rash has flat or slightly raised red spots, which rapidly progress to fluid-filled blisters. You’ll probably notice them on the face, scalp, and chest first.


Image showing boy with chickenpox

Chickenpox rash

The spots appear in patches or ‘crops’ and may spread to your arms and legs. You may also get them in your mouth, on your nose, genitals, and scalp. The blisters can be extremely itchy and will usually crust over within a few days, forming scabs. They can take up to two weeks to heal completely.


Image showing chickenpox blisters

Chickenpox blisters

Chickenpox symptoms vary from person to person. Some children may have only a few blistered spots, but others will have spots all over their body. Adults are more likely to have worse symptoms than children. They’re also more likely to get complications.

When to seek help for chickenpox

If a young child has chickenpox, you’ll usually be able to manage the symptoms at home, without medical help. You’ll probably be able to tell it’s chickenpox because it causes such a distinctive rash. If you know your child has recently been in contact with someone who has chickenpox, this makes it even more likely.

If you’re not sure whether the symptoms could be due to something else though, contact your GP. You should also contact your GP if you (or your child) are feeling particularly unwell.

There are certain other times with chickenpox when you should also contact your GP, even if you just think you’ve been exposed to it. These include if:

  • you’re pregnant
  • you have a newborn baby
  • you have a weakened immune system

There are treatments you may be able to take that can help to make your symptoms less severe. See the Treatment section for more information.

If you do need to see a doctor, let your GP surgery know that you may have chickenpox when you contact them. If you need to be seen, they may want to keep you away from other patients. For instance, they may ask you to wait in a different room to their usual waiting room. This is to make sure you don’t pass the infection on to anyone at a higher risk of complications.

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Stopping the spread of chickenpox

Chickenpox is highly contagious. You’re most infectious one to two days before your rash appears, so you can spread it to other people before you even realise you have it. You remain infectious until all your spots crust over. This is usually about five days after the rash appears.

If you think you have chickenpox, keep away from young babies, pregnant women and anyone with a weakened immune system. This might include people having cancer treatment or taking drugs that suppress the immune system, such as steroids or methotrexate. If possible, it’s best to stay away from work and public places, including your GP surgery. If your child has chickenpox, keep them off school or nursery for at least five days, or until the spots have all crusted over.

Children will now be vaccinated against chickenpox for free on the NHS. The new MMRV vaccine will protect against measles, mumps, rubella and varicella roster virus (chickenpox).

The first dose of the vaccine will be given to children at 12 months, and the second dose at 18 months. This will be offered alongside their other routine jabs. Vaccines may also become available to older children who aren’t vaccinated against chickenpox.

Like any vaccine, your child may experience mild side-effects from the MMRV jab. These can include:

  • pain, redness or swelling at the site of the injection
  • fever
  • a mild chickenpox rash

These effects are usually temporary and nothing to worry about. But if you notice any problems or have any concerns, contact a doctor. The vaccine should help prevent severe cases of chickenpox in the future.

Self-help for chickenpox

If you or your child are generally fit and healthy, you’ll usually recover from chickenpox without any specific treatment. There are some simple things you can do at home to ease the symptoms. These include the following.

  • Make sure you’re drinking enough fluids to prevent dehydration.
  • Make sure you don’t get too hot or too cold. Wear layers so you can take clothes off (or put them on) if you need to.
  • Wear smooth, cotton fabrics that are less likely to irritate your rash.
  • Keep your nails short to stop you damaging your skin if you scratch it.
  • Try not to scratch your spots though, as this can lead to bacterial infection or scarring. You might want to put mittens on young children overnight to reduce scratching.
  • Wash or bathe regularly to relieve itching and stop your spots getting infected.

Relieving itchy skin

If your skin is very itchy, try using cool or wet compresses to ease it. Some people find that an oatmeal or cornflour bath helps. Calamine lotion can help to soothe itching at first, but stops working once the lotion dries on your skin. It can also dry out your skin, making you want to scratch more.

If you’re very itchy, you could try taking an antihistamine, such as chlorphenamine (Piriton). You can buy this over the counter from a pharmacy. Some antihistamines can cause drowsiness, so are best taken at bedtime. They’re not suitable for babies under one year.

Reducing fever

You can take paracetamol if you have any pain or a fever that’s bothering you. Children and babies older than two months can have junior paracetamol (such as Calpol).

Remember - don’t take non-steroidal anti-inflammatory drugs (such as ibuprofen). These medicines can cause a serious skin infection in children and adults with chickenpox.

Always read the patient information leaflet that comes with any medicine. If you have any questions, ask your pharmacist for advice. If your symptoms seem to be getting worse, or you start feeling very unwell, contact your GP.

Treatment of chickenpox for people at risk

In certain cases, your doctor may be able to offer you treatment if you have chickenpox, or think you’ve been exposed to the virus. This includes if:

  • you’re pregnant
  • you have a newborn baby
  • you have a weakened immune system

There are two main types of treatment your doctor may give you.

Antiviral medicines

If you’re over 14 years, your GP may offer you an antiviral drug called aciclovir (Zovirax). This is most likely if your chickenpox is severe or you’re at risk of getting complications. For aciclovir to work, it has to be less than 24 hours since your spots first appeared. Starting it this soon may help to reduce your symptoms and mean you recover more quickly.

Antibody treatment

If you know you’ve been exposed to the virus, you may be able to have antibody treatment before you get symptoms, to help to fight it off. Your doctor is only likely to offer this if you’re at real risk of a severe infection or complications (for example, you’re pregnant or have a weakened immune system).

Your doctor will ask you to have a test for antibodies to chickenpox first, to check whether you’re immune. You may have to go to hospital to have this done, as it can be quicker to get the results. If the test is negative (meaning you’re not already immune), you may have an antibody injection. This is called a varicella zoster immunoglobulin (VZIG) injection.

Antibodies are proteins that help your immune system to fight bacteria and viruses. For the VZIG injection to work, you’ll need to have it within 10 days of coming into contact with someone who has chickenpox. The antibodies may not stop you having chickenpox, but they may make your symptoms milder.

Complications of chickenpox

Complications of chickenpox are rare. If you’re generally healthy, it’s usually a mild infection and serious problems are unlikely. Chickenpox in adults is more likely to be serious than in children. Chickenpox can also be more serious for:

  • pregnant women
  • older people
  • newborn babies
  • people with a weakened immune system

Sometimes the chickenpox spots get infected with bacteria – often from scratching. Chickenpox spots can sometimes leave scars, especially if they become infected. Signs of a bacterial infection include a high temperature (fever), and redness and pain around the chickenpox spots. Get urgent medical help if you or your child have these symptoms.

Young children can also be at risk of becoming dehydrated. Signs of dehydration include peeing less, feeling very tired, and cold fingers and toes. Your child’s skin may also be less elastic, which means it won’t bounce back if you pull it slightly. If your child shows these signs, call a doctor straightaway.

Rarer complications of chickenpox can include:

Chickenpox and pregnancy

If you’re not immune to chickenpox and you catch it during the first 28 weeks of your pregnancy, there’s a small risk it could affect your baby. If you get chickenpox in the last few weeks of your pregnancy, before you give birth, your baby could get chickenpox too. Women who are pregnant are also more likely to get complications from chickenpox, such as pneumonia.

If you’re pregnant and come into contact with chickenpox, you don’t need to worry if you’ve had chickenpox before. Or if you’ve had a chickenpox vaccine, as you should already be immune.

If you’ve never had chickenpox or aren’t sure, see your midwife or GP as soon as possible. Your GP may give you treatments that can make the infection less severe if you do get it. See the Treatment section above for more information. If you develop chickenpox, your GP may want to monitor you closely in case of complications, or refer you to a specialist.

Contact your GP or get urgent medical advice from your midwife or health visitor if you get chickenpox within a week of giving birth. Your baby can be given injections of antibodies to help to protect them against the infection.

Chickenpox is most infectious one to two days before your rash appears. So you can spread it to other people before you even realise you have it. You remain infectious until all your spots crust over – usually about five days after the rash appears. See the section on stopping the spread of chickenpox.

Chickenpox spreads easily, usually by direct contact or via droplets in the air. So chickenpox is transmitted when you cough or sneeze. Or you can catch it if you touch infected surfaces or blisters. See the section on stopping the spread of chickenpox.

Some people feel ill for a day or two before they get a rash. The rash starts with spots that blister, and then crust over about five days after the rash started. After that, you’re no longer infectious. Once you’ve had chickenpox, the virus stays in your body for life, but usually causes no problems.

If your child has chickenpox, you can still go to work as long as you’re healthy and you’ve had chickenpox before. If you haven’t had chickenpox before, it’s very likely that you’ll catch it from your child, so you should stay off work. It usually takes around two weeks to get symptoms after catching it yourself.

There is a chickenpox vaccine, which across the UK is recommended for certain groups (if they’re not immune already). This includes healthcare workers and anyone in regular close contact with someone who has a weakened immune system. In England (from January 2026), the chickenpox vaccine is also offered to all children, combined with their other routine jabs at 12 and 18 months of age.

You’ll usually recover from chickenpox without any specific treatment if you or your child are generally fit and healthy.

There are some simple things you can do at home to ease the symptoms. These include drinking enough fluids, wearing clothes that aren’t irritating, trying not to scratch, and bathing regularly. See the section on self-help for chickenpox.

You may get treatment from the GP if you’re pregnant, have a newborn baby, or have a weakened immune system. This treatment may be antivirals or antibodies. See the section on treatment of chickenpox for people at risk.

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