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Fever in children

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Normal body temperature varies between children. A child’s temperature will also go up and down naturally throughout the day. But a fever means their temperature is 38°C (100.4°F) or higher. The medical name for fever is pyrexia.

About fever in children

Fever is very common, especially in young children. It’s the body’s normal response to help fight infection. Each year, around 3 in 10 parents seek health advice because their child has a fever. It’s upsetting and worrying when your child is ill and has a fever. But there are things you can do to help them feel better.

A high temperature (fever) in children is usually caused by a viral infection of some kind. These often get better on their own. But fever can sometimes be a sign of a more serious infection. So, it’s important to know what to look out for and how to manage a fever in your child – and know when to get medical help.

Causes of fever in children

Many conditions can cause fever in children. By far the most common cause is a viral infection. These include coughs, colds, and flu. Some infections are bacterial, including some throat and urine infections.

Children may develop a fever as a symptom of other health conditions. These include some inflammatory and autoimmune conditions, such as inflammatory bowel diseases or juvenile arthritis. An autoimmune condition means your immune system has become overactive and attacks healthy body tissues.

Other conditions can cause fever, but these causes are much rarer than viral or bacterial infections.

Fever is also a common side-effect of immunisations. Some vaccines can cause a fever within a few hours, for example, tetanus. Others, such as the MMR vaccine, may lead to fever seven to 10 days later. When your child has an immunisation, ask the doctor or nurse what to do if they develop a fever.

Symptoms of fever in children

If your child has a fever, they’ll have a body temperature of 38°C (100.4°F) or higher. They may feel or look generally unwell and may not be as active and engaged as usual. They may not want to eat or drink.

Symptoms of fever can include:

  • feeling hot to touch
  • feeling cold and shivery
  • looking pale
  • headache
  • tummy ache
  • red or flushed skin
  • feeling sick

Your child’s temperature alone isn’t always a sign of how serious their illness is. Sometimes, minor illnesses can cause a very high temperature. Some serious infections may only cause a small rise in temperature.

Diagnosis of fever in children

You can tell if your child has a fever by checking their temperature with a thermometer. You can do this yourself at home. It will be most accurate if you use an electronic, digital thermometer. Read and follow the instructions to make sure you get an accurate reading.

  • For babies less than four weeks old, use an electronic thermometer under the arm (in the armpit).
  • For children between a month and five years, use an electronic thermometer under the arm or in the ear.
  • For children over five use a digital mouth thermometer. Or use the methods for younger children.

Measuring temperature on a child’s forehead can be unreliable. It is better to use one of the methods listed above.

At the doctor’s

If you go to see your GP, they’ll examine your child and ask about their symptoms and medical history. If you’ve travelled abroad recently or had contact with someone who has been unwell with a fever, let your GP know. They’ll take your child’s temperature and check their heart rate. Your GP might check for signs of infection in your child’s ears, throat, or tummy (abdomen). They may also use a stethoscope to listen to their breathing.

If there is an obvious cause for your child’s fever, they may not need any further tests. But if it isn’t clear what’s causing it, your GP may ask for a urine (pee) sample. They may refer your child to a paediatrician for more tests. This is a doctor who specialises in children’s health.

For advice on when to get emergency help, see our section on Self-Help below.

Under 18 GP Appointments

We now offer GP appointments for children under 18 via our remote video service (UK wide) and face to face appointments at selected centres. Please note that these appointments cannot be booked online so please call 0330 822 3072 for more information or to book. Lines are open Monday to Friday 8am to 8pm, Saturday and Sunday 9am to 5pm. We may record and monitor our calls. Available from £49.

To book or to make an enquiry, call us on 0800 665 577

Self-help for fever in children

Fever is part of the body’s natural response to infection. If you are caring for a child with a fever, there are a few things you can do to keep them comfortable.

Offer your child regular drinks to prevent them getting dehydrated. If you’re breastfeeding, you can carry on as normal.

It’s important that your child doesn’t overheat, but they shouldn’t be underdressed either. Don’t actively try to cool your child – for example, with tepid sponging or a cold bath. It’s unlikely to work, it can be distressing for your child, and it may cause them to start shivering.

While your child has a fever, it’s best to keep them away from school or nursery. Keep an eye on them and check them during the night too.

Medicines

If your child has a fever and they’re uncomfortable or distressed, you can give them paracetamol or ibuprofen. Don’t give these medicines just to bring down their temperature if your child is otherwise well. The fever is helping the body to fight the infection.

IIf you try paracetamol and it doesn’t seem to work, you can try ibuprofen instead and vice versa. Don’t give both medicines at once, though. If your child has asthma, check with your doctor before giving ibuprofen. You should also not give ibuprofen to a child with chicken pox or is dehydrated.

Make sure you keep a note of how much paracetamol or ibuprofen your child has had and when you’ve given it. This will help to make sure you don’t accidentally give them more than the recommended amount.

You can buy medicines for children from a pharmacy without a prescription. Always read the patient information leaflet that comes with your child’s medicine and if you have any questions, ask your pharmacist for advice.

Getting urgent medical advice or help

If your child has a high temperature or fever, they may need to go to a hospital for treatment. Take your child to accident and emergency or call an ambulance if they:

  • are less than three months old and have a temperature of 38°C (100.4°F) or above
  • have bluish, pale or mottled skin
  • have a weak, high-pitched cry or won’t stop crying
  • have difficulty breathing or their breathing is very quick or noisy
  • have a stiff neck
  • shy away from bright lights
  • develop a rash that doesn’t disappear when you press on it
  • don’t respond to you in the usual way – for example, your baby doesn’t smile when you smile
  • are dehydrated
  • have very cold hands and feet

Your child or baby may look generally unwell if they’re dehydrated. They may pee less and have sunken eyes. If they cry, they may not produce any tears.

Seek urgent medical advice from your GP or out-of-hours service if:

  • you think they’re getting worse instead of better
  • they’re shivering
  • they’re unusually sleepy or difficult to wake
  • they’re less active than usual
  • their fever has lasted for five days or more
  • the temperature goes above 39°C in a baby under six months old
  • they have swollen joints, arms or legs
  • they can’t put weight on one or both legs, or they don’t seem to be using their arms or legs
  • they don’t pee as much as normal
  • they’re not feeding or eating as normal

In some children, a high fever can lead to fits called febrile seizures or convulsions. This can be very frightening but try to stay calm. Use your hands or a cushion to protect your child’s head. Once the seizure stops, put your child in the recovery position while they recover. Febrile seizures usually last just a few minutes and often don’t need any treatment.

Remember: if it’s the first seizure your child has had, OR it lasts for longer than five minutes, always call an ambulance.

Treatment of fever in children

A high fever in children is often caused by a viral infection and will get better on its own. So you may just need to keep them comfortable and wait for them to get better (see our section on self-help). But sometimes, a fever can be the sign of a more serious illness. That’s why it’s important to keep an eye out for any changes in your child’s behaviour and any other symptoms.

If your GP thinks your child’s infection is bacterial, they may prescribe antibiotics. It’s very important to finish the full course when you or your child are prescribed antibiotics. If you don’t, you may help to cause resistant strains of bacteria.

Fevers in children normally get better on their own. But seek help if a fever worsens, or hasn’t improved after five days. Keep an eye out for changes in other symptoms. See our symptoms of fever in children section, for suggestions of what to look out for.

A temperature isn’t considered a fever unless it’s higher than 38°C (100.4°F). Normal body temperature varies between children. Temperature also naturally goes up and down in an individual child throughout the day. If a child’s temperature goes above 39°C and they are under six months old, contact your doctor. For more about when to contact the doctor, see our symptoms of fever in children section.

If your child has a fever, make sure they drink plenty, to prevent dehydration. Try to keep them at a comfortable temperature. But don’t sponge them down as they may become chilled. Paracetamol or ibuprofen will help to bring a temperature down, but you should only give it if your child is uncomfortable or distressed. See our section self-help for fever in children for more information.

Yes, you can let your child go to sleep but do check on them regularly during the night. If you’re at all concerned, contact your GP surgery or call an ambulance. For more information on how to assess your child’s fever and get an idea of what’s normal and when to get help, see our sections on symptoms of fever in children and self-help for fever in children.

Your child or baby may look generally unwell if they’re dehydrated. They may pee less and have sunken eyes too. If they cry, they won’t produce any tears. Give your child regular drinks. If you’re breastfeeding, keep trying to feed your baby. For more information on caring for a child with a fever, see our section on self-help for fever in children .

Yes, immunisation can sometimes cause a mild fever. When your child has a vaccine, ask your health professional what to do if your child develops a fever. For more information, see our section on causes of fever in children .

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  • Fever in Infants and Children. MSD Manuals. msdmanuals.com, last reviewed November 2022
  • Assessment of fever in children. BMJ Best Practice. bestpractice.bmj.com, last updated October 2023
  • Ill and Feverish Child. Patient. patient.info, last updated February 2020
  • Fever in under 5s. National Institute for Health and Care Excellence. nice.org.uk, last updated November 2021
  • Autoimmune diseases. UCL Institute of Immunity and Transplantation. ucl.ac.uk, accessed February 2024
  • The Green Book. UK Health Security Agency. gov.uk, accessed February 2024
  • Meningitis. Patient. patient.info, last updated July 2019
  • Febrile seizures. MSD Manuals. msdmanuals.com, last reviewed March 2023
  • Febrile convulsions. Patient. patient.info, last updated December 2020
  • Feverish children – risk assessment and management. NICE Clinical Knowledge Summaries. cks.nice.org.uk, last revised June 2023
  • Ibuprofen. NICE British National Formulary for Children. bnfc.nice.org.uk, accessed February 2024
  • Paracetamol. NICE British National Formulary for Children. bnfc.nice.org.uk, accessed February 2024
  • Fever in children. St John Ambulance. sjacymru.org.uk, accessed July 2024
  • Personal Communication, Dr Sarah Aldugman, BUPA Lead Clinician, July 2024
  • Ibuprofen for pain and inflammation. Medicines for Children. medicinesforchildren.org.uk, accessed July 2024
  • A leaflet for treating respiratory tract infections. Target. elearning.rcgp.org.uk, published November 2017
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