Your health expert: Dr Adrian Raby, General Practitioner
Content editor review by Rachael Mayfield-Blake, December 2021
Next review due December 2024
The normal body temperature of children varies from child to child and goes up and down naturally throughout the day. But fever in children is when 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. Each year, around three in 10 parents seek health advice because their child has a fever. When your child is ill and has a fever, it can be upsetting and worrying but there are things you can do to help them feel better.
A high temperature (fever) in children is usually caused by an infection of some kind, and often gets better on its own. But it can sometimes be a sign of a more serious infection. So, it’s important to know how to manage and treat your child when they have a fever, and when to get medical help.
Causes of fever in children
There are many conditions that can cause a fever in children. Most fevers in children are caused by viral infections, and some are caused by bacterial infections. These can include coughs, colds, flu and other viral infections, and throat, ear, chest and urine infections. Less often, a fever can be a sign of a serious illness such as meningitis or sepsis.
Children can also develop a fever as a symptom of other health conditions, including some autoimmune conditions. An autoimmune condition is when your immune system attacks your healthy body tissues. Familial dysautonomia, some cancers, liver disease and kidney disease may all cause a fever. But these causes are rare.
Children can also get a fever as a side-effect of some immunisations. For more information, see the FAQ: Could my child have a fever after being immunised?
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.
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, whereas some serious infections can cause only a small rise in temperature. As well as your child’s high temperature, you may notice other symptoms of an infection such as:
- diarrhoea and vomiting
- earache or your child may clutch at their ears
- a cough, runny nose or wheezy breathing
- a rash
Getting medical advice or help
If your child has a high temperature or fever, they may need to go to a hospital for treatment. You should get medical help straightaway by taking your child to accident and emergency or calling 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 are breathing very quickly or noisily
- 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 – see the FAQ below for symptoms of dehydration
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 up
- they’re less active than usual
- their fever has lasted for five days or more
- 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 are not feeding or eating as normal
In some children, a high fever can lead to fits called febrile seizures or convulsions. If this happens, your child can lose consciousness and twitch and shake for several minutes. You can find out what to do if your child has a febrile seizure, in the FAQ section.
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.
- If your child is younger than four weeks old, use an electronic thermometer to take their temperature under their arm (in their armpit).
- For children between a month and five years, you can measure temperature under their arm or in their ear using an electronic thermometer.
- You can use a digital mouth thermometer for children aged over five (as well as the methods for younger children).
Follow the instructions that come with the thermometer to make sure you get an accurate reading.
Thermometers that measure temperature on a child’s forehead can be unreliable. It is better to use one of the types listed above.
At the doctor’s
If you go to see your GP, they’ll ask about your child's symptoms and medical history and examine them. 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 other signs of infection by examining your child’s ears, throat and tummy (abdomen), and by listening to their breathing.
There may be an obvious cause for your child’s fever, so they may not need to have further tests. But if it isn’t clear, your GP may ask for a urine (pee) sample. Your GP may also refer your child to a paediatrician (a doctor who specialises in children’s health) for more tests.
Under 18 GP Appointments
We now offer GP appointments for children aged 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 0343 253 8381∧
Self-help for fever in children
Fever is part of the body’s natural response to infection, so sometimes it doesn’t need to be treated, as long as your child isn’t distressed.
Offer your child something to drink regularly to prevent them getting dehydrated. If you’re breastfeeding your child, you can carry on as normal. For information on how you can tell if your child is dehydrated, see the FAQ: How can I tell if my child is dehydrated?
Although it’s important that your child doesn’t overheat, take care to ensure they aren’t 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.
If 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.
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.
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, to treat your child’s fever, 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 believes your child has a bacterial infection, they may prescribe a course of antibiotics to treat the cause of the fever. And if your child’s doctor identifies the cause of the fever, they’ll treat this if possible.
Common childhood viruses
In this podcast, Specialist Health Editor, Alice Windsor, is joined by Bupa GP, Dr Samantha Wild, to discuss common childhood viruses. They discuss why children pick up so many viruses and illnesses during childhood, how to manage them and when to seek medical advice. They also discuss the implications of the pandemic on general immunity and if the vaccination programme will extend to children.
Common childhood viruses [podcast]
Why children pick up so many viruses | Podcast | Listen in 18:31 minutes
In this podcast, Bupa GP, Dr Samantha Wild, to discuss common childhood viruses. Find out why children pick up so many viruses and illnesses during childhood, how to manage them and when to seek medical advice. They also discuss how the pandemic has affected general immunity, and whether the vaccination programme will extend to children.
Speaker 1: Alice Windsor
Hello and welcome to another episode of the Bupa Healthy Me Podcast. Today we're going to be talking about common childhood viruses. I'm Alice Windsor and I'm a specialist health editor at Bupa. I'm also a mother to two young children, Julius who's 3, and Molly, who's 6. I'm joined today by Doctor Samantha Wild, who is a Bupa GP. Hi, Samantha.
Speaker 2: Dr Samantha Wild
Hi, Alice.
Alice Windsor:
Hi. Thank you for joining me today.
Alice Windsor:
I think we'll start off by saying that it's very common for children to pick up viruses throughout childhood, as we know.
As a parent myself, I know just how easily and how often children could pick up things, may that range from a mild cold or to more severe bouts of illness such as tonsillitis or croup.
And some children I think are probably more prone to becoming more ill than others. I know my two children are very different in how often they pick up things.
Or some parents might say that their child has a weakness. They might be, you know, a child that always gets a temperature or always has a cough or a runny nose.
So I think it would be great to start by talking about why children get so many illnesses. Not all of them, but why throughout childhood, it's maybe more common and is this important for children to help them build a strong immune system?
Dr Samantha Wild:
Yes, it is. So, in the first few years of life, catching viruses is the best way for your child to build a strong and healthy immunity which will set them up for life. Babies are born with a very delicate immature immune system, which is why we recommend breastfeeding because we then pass on natural antibodies in our breast milk, and we also administer vaccines at that age too.
But as children are exposed to vaccines and viruses on a day-to-day basis in childcare, and then at school, and these are all spread by coughing, sneezing or breathing, as we know from the precautions, we've had to take now with COVID. But this is the way that they build up their immune systems. And so, the average school-age child can get sort of three to eight colds a year and two to three bouts of viral gastroenteritis.
And that is completely normal. So, although it may seem a lot, that's normal. It's also very common for children to get sick from one virus very quickly after recovering from another.
So, it might seem that they've been sick for weeks on end and as a GP, you often see these children being brought in and parents are worried, but they have actually recovered from one illness and you've not really noticed, and they very quickly caught another one again, but that frequency does drop as they get older and their immune system has then been built up.
Alice Windsor:
Definitely. Actually, I can relate to that. My youngest seemed to, in his first couple of years, really have, you know, one thing after another, so it's interesting that you say that.
Dr Samantha Wild:
Yeah, I remember that with my children too.
Alice Windsor:
Thinking about some of the most common childhood viruses that are out there in the community. You know, what are the most common viruses that children can bring home and are they things we should be worried about?
Dr Samantha Wild:
So, I think top of the list has got to be sort of common colds and coughs, which obviously we all know about. So, the common cold it’s usually a mild self-limiting viral upper respiratory tract infection. We know it's more frequent in the winter months.
Dr Samantha Wild:
But the main take home message is that antibiotics are ineffective. It is a virus, and so antibiotics do not work for that. So, on the whole, you know, children can be managed quite safely at home, keeping them well hydrated, giving them paracetamol if they need it.
And it's not unusual for them to sort of lose their appetite a little bit or maybe be a bit more sleepy.
Dr Samantha Wild:
But you know, we would always say use your parental instinct. So, mother, father, if you feel that the child is just not right, if they've got a very high fever, if they've got a rash, if they're very sleepy, if they're having difficulty breathing, that is when you need to see a GP.
But a normal cough or cold then obviously, you know, I think most parents would be happy to manage that at home.
Dr Samantha Wild:
It's using your common sense really. And using that sort of that gut instinct that we must never sort of-
Alice Windsor:
Take for granted.
Dr Samantha Wild:
Ignore, yeah, exactly. And I think this is where, you know, people have come unstuck in the past. You know, it's such an important instinct that parents have.
Alice Windsor:
Yeah. And I think from my point of view as well that one of the most worrying things I find when I've got a child at home who's is sick is what is the temperature. And I've actually, you know, what my youngest did have a febrile seizure at one point from his temperature just being too high.
Alice Windsor:
And I'd done everything right and sort of given them, you know, ibuprofen and paracetamol at the right time period. And it still happened. What advice could you give parents around temperatures at home because, you know, for me, I'm aware of how to manage them, but it's still a worry. And I am that parent that's got their thermometer in their ear quite often.
Dr Samantha Wild:
Yeah, yeah.
Oh, that's good. That's good. So just to sort of put it into perspective. So a normal temperature in a child is 36.4°.
And in general, we tend to say a high temperature is over 38°, although for a child sort of over 37.5° is quite high and high temperatures are really common and they often clear up themselves without needing any treatment.
And the reason your temperature does go up is because that's the way that the body fights off infection.
So you know it has an important function. But if a child is becoming distressed with that, that is when we say that you should give paracetamol or ibuprofen.
You don't need to use them together at the same time. Usually sort of use one or the other, but if the child isn't responding to the one, that's when you can use the other one. And so yeah, it's not just treating the temperature on its own, it's treating the fact that they may be distressed with it too.
As you said, very good to use a digital thermometer to actually ascertain what the temperature is. And then really important to give the child plenty of fluids. Make sure that they're not becoming dehydrated.
Give them a little bit of food if they want to, and then just keep an eye on things. If your child's younger, so three months or below, then a GP would want to see them. If their temperature was over 38°, a child at between three and six months, a temperature over 39°.
But for any other child, just if that temperature is lasting and it's just not settling, if they are becoming dehydrated or again just using those parental instincts - if there's any other sort of signs that just don't seem right.
So, we talk about floppy children. So, if children just seem like they've got no energy, if they're not responding to you, if they are breathing very quickly, obviously if there's a rash that you know, just doesn't look like a normal rash, all those sorts of reasons that you should get some medical advice.
Alice Windsor:
Yeah, brilliant. In terms of that, these sort of you know these things to look for that we really should be seeking medical help about, what would your best advice be? Would it be the first port of call to contact your GP surgery, or would you say always go for the 111 number for advice, and then what are those moments where it is always a 999 call?
Dr Samantha Wild:
I mean it completely depends what time of day it is. So, you know if you're within sort of normal working hours for a GP, try your GP surgery.
Obviously, things have been very different at the moment with COVID, so it will depend how your GP surgery is working at the moment and sometimes things are being directed still, through 111 to start with, if it's out of hours, I would definitely go 111 first.
Again, it's just using those instincts so you know if a child is really struggling to breathe, if they can't complete a sentence without stopping for breath, you're going to want to get them seen very quickly.
And so, you know, if if it's taking time, then it's going to be 999. You know other things to consider, or whether you've got transport to get to A&E.
Alice Windsor:
Yeah.
Dr Samantha Wild:
But at the moment, you know we are being encouraged not to just turn up at GP surgeries at hospitals as well because of COVID. So the advice is very different at the moment than it would normally be. So I think at the moment, yeah, you need to speak to someone and 111 is going to be the best, sort of quickest route to get some advice.
Alice Windsor:
Brilliant. I think as well, you know, it's just really important, like you say, to look at your child as a whole. And I think as a parent, you know your child better than anyone. So I think that is the best advice.
Dr Samantha Wild:
Definitely.
Alice Windsor:
OK. I've got a few questions that I've gathered from parents here that I thought we could just pick up on. I've got one here about viral rashes and when they come up and post-viral rashes, could you tell me a little bit more about those?
Because I think as a parent again, you know, my children have often had rashes alongside different illnesses and, you know, what we should be looking for in rashes and what is common, and when should we be seeking some medical advice?
Dr Samantha Wild:
So viral rashes, again, as you said, are really common in young children and they are usually called sort of reddish or pink spots over large parts of the body. So often on the chest and the back area.
And they're usually not sort of itchy or although some can be. Usually, like I say, it sort of covers that big area, but it's also symmetrical as opposed to just one side of the body, and you can usually tell that it's come, you know very quickly after or with a viral infection.
So, they might have a fever or runny nose or cough. Something else that you can tell you know is going on to sort of explain that.
So, you know, if a child is fairly well with it, if they've obviously just got a cough or a cold and the rash and we don't need to see them. When you do need to see a doctor is 1: if you did want a definite diagnosis of what it was, but also if the rash was causing them any pain at all.
A meningitis rash is obviously something that you know, we all worry about when we see a rash.
Alice Windsor:
Yeah. And is the glass test still something that we should do?
Dr Samantha Wild:
It definitely is. But just to say that a meningitis rash appears very late, usually with meningitis. So, you can usually tell that your child is very unwell before that rash appears, so we want to see a child before a rash appears there so, but yes, we use the tumbler test.
So, for people that don't know, that's if you use the bottom of a clear tumbler to gently apply pressure onto a rash, and it doesn't then go white or lighten up as you press on it and it sort of remains quite dark. And so what the rash that you get in meningitis is, it's bleeding under the skin.
So, it's very different to something that, you know, as you press it, it disappears. So that is, you know, definitely a medical emergency and you should then be calling 999.
Another reason you would call a GP if they had a rash, again, is if your child's very lethargic, if they are getting dehydrated so they're not feeding. If they have a fever, again, that isn't settling, as I said already, or if the rash just isn't settling after a few days as well.
Alice Windsor:
Brilliant. It's great advice. And the next question here is about a cough. As we all know with COVID going on, it's all about coughs at the minute, but someone has asked: my child has had a cough for a while a while after suffering a cold and at what point should you take them to the doctor? So, you know, how long do we keep them at home with this cough before we seek some advice.
Dr Samantha Wild:
OK. So again, you know, coughs are really common with colds and what happens is the mucus trickles down the back of the throat. Children are not very good at blowing their noses as adults are.
So, you know, that that's what stimulates the cough. If they're feeding, drinking, eating, breathing normally, you know, the cough is nothing to worry about.
So, although it can be sort of quite upsetting to hear them cough, you know that's the body's way of clearing the phlegm away from the chest or the back of the throat. And so that's completely normal. If it's been going on for longer than three weeks.
So that's when a GP would normally want to see them or, again, if they had a very high temperature, if they're, you know, if they feel hot and shivery, if they've got any difficulty with their breathing with it, again, if they can't talk in sentences, we would want to see them to make sure that it's not a chest infection.
And also, we'd want to see them if it carried on for, as I say, longer than the three weeks, if it's worse at night, if it's brought on by sort of running around, exertion, that could be a sign of asthma. So again, we would want to see them then.
So, it's if it's lingering and if it seems to be associated with any other symptoms, we would want to review them.
Alice Windsor:
And I think from my personal experience and it's not quite a question, but it's more of a topic of conversation. My youngest has had recurring croup since he was very little. We've had a few trips to A&E.
And it's amazing how many people, especially maybe of an older generation like my parents, you know, would say, get the steam going in the shower and and if he's got, you know, he's tight in the chest and it's sort of that croup cough, to use steam when actually the guidance has changed that.
Dr Samantha Wild:
Yeah, we don't recommend that. No, no. And yeah. So, you will still find that some doctors will sort of recommend that as well because they might not be sort of up to date. They used to think that the steam would loosen the mucus and make it easier to breathe. But there is very little evidence that it does do any good.
Alice Windsor:
Yes.
Dr Samantha Wild:
And I think some children were actually being scalded by the steam. So actually, you know, we've stopped recommending that now. The key with croup is to just keep children as calm as possible.
So not to panic, to keep them sat upright on your lap, as I'm sure you've probably found out, then, if you've been through this a few times, and you know a GP or hospital doctor, if they've ended up in hospital, we usually give a single dose of steroid medication if they need it and then that's what really works.
Alice Windsor:
It's very effective isn’t it.
OK. I've got a question here. It's sort of related to the pandemic. Should we be worried about the fact that children haven't been picking up the usual childhood infections this winter?
So, my son had chickenpox, hand, foot and mouth, and a host of other infections in his first year of school. But given COVID precautions, my daughter hasn't had any of these since starting reception. Should I be worried?
Dr Samantha Wild:
I think that's a really interesting question and I think time will probably tell with that. I think at the moment, as it's only been a year, and we don't necessarily get all those illnesses and build up all the immunity in that year, then you know it's unlikely to be an issue. And as children start to mix again in schools, then they're going to sort of – we’ll see that things start to spread again.
Also, as I said before, as children get older, their immune system is becoming more mature anyway, so it might be that they can fight off some of these illnesses themselves.
Yeah, it'll be interesting to see, but I think, you know, within the school environment and especially younger age children, obviously it's very difficult for teachers to ensure that there is any social distancing, you know, masks aren't necessarily worn in children of that age. So, I think, yeah, it'll start to spread as it always has done.
Alice Windsor:
Absolutely.
Great. And I think as well it'd be actually really good to talk about the flu vaccine. I’ve got a question here and it says, what is the effect of the flu vaccination on my child's long-term immunity?
Dr Samantha Wild:
OK. So obviously we have the flu vaccine every year and, you know, we're waiting to see really what's going to be happening with the COVID vaccine, because it looks like that's going to need to be, you know, fairly frequent as well.
So, the reason that we have the flu vaccine every year is because our immune protection that we're given from the vaccination declines with time, and also because the flu virus is constantly changing and, again, we've talked about this with COVID and the different variants that appear.
So, what they have to do is, you know, from the research, try and predict what might, what virus might be coming up next that needs to be protected. So that is why we are given the vaccination on a yearly basis.
As you know, the flu vaccine has been around for years. It's very safe. It's very effective. And so, you know, we would carry on having that yearly in conjunction with COVID vaccination as whatever they decide the time interval needs to be.
Alice Windsor:
Right. And I think it's why we, you know, we probably no one knows the answer to this at the moment. But do you think that the coronavirus vaccine is going to you know come down to children at some point this year or next year? Obviously, it's still a question mark.
Dr Samantha Wild:
Yes, I think it, yeah, I think it definitely will. I was speaking to a professor from London who was saying that he thought probably children over the age of 12, maybe to start with.
But yes, I think, you know, there's been a lot of talk about herd immunity and obviously if we can get that amongst children and we know that children don't really tend to suffer with it, but unfortunately, they do spread it, then it would seem to make sense I think, but I'm definitely not an expert in this area. So, I will leave that to the experts to decide.
Alice Windsor:
That's great, Sam. Thank you so much. We've covered some really brilliant questions today. It's such a vast topic area and children can get so many illnesses and viruses when they're young, but I think, you know, we've just touched on the surface today about how parents can deal with it and, you know, really when to go and see a doctor and when to ask for help.
I think that's a really important thing, when to seek that medical advice, and you know, we've got so much information on our Bupa website about, you know, different childhood illnesses, which is a great place for people to go if they need to, but we'll leave that for today and say thank you for joining.
Dr Samantha Wild:
Thank you.
A high fever in children will normally get better on its own as your child fights off an infection. While they recover you can do some things to keep them comfortable. But sometimes, a fever can be the sign of a more serious illness. So, it’s important to keep an eye out for any changes in your child’s behaviour and any other symptoms.
For more information, see our sections: Self-help for fever in children and Symptoms of fever in children.
A child is considered to have a fever if their temperature is 38°C (100.4°F) or higher. The normal body temperature of children can vary and can go up and down in an individual child naturally throughout the day. But if it’s higher than 38°C (100.4°F), they have a fever.
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 section: Symptoms of 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 something to drink regularly if they have a fever. If you’re breastfeeding, keep trying to feed your baby.
Yes, immunisation can sometimes cause a mild fever. Some vaccines – for example, tetanus – can cause a fever within a few hours. Others, such as the MMR vaccine, may lead to fever seven to 10 days later. When your child has a vaccine, ask your health professional what to do if your child develops a fever.
Febrile seizures (fits caused by a high temperature) 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. But if the seizure lasts for longer than five minutes, call for an ambulance.
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