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Children's health

Flu in children: symptoms, home care and the children's flu vaccine

Flu is a viral illness that comes on suddenly, and in children it can mean a high temperature, an aching body, a dry cough and a child who is much less active than usual. Many children recover at home in about a week, but flu can lead to pneumonia and hospital care. This guide explains the signs, simple care measures, when to ask for help and how the NHS children's flu vaccine works.

Last checked: 2026-10-04

Key facts

At a glance.

  • Onset

    The NHS says flu symptoms come on very quickly, within a few hours, and make you feel exhausted and too unwell to carry on as normal.

  • Duration

    NHS inform says most people feel better within a week, though a lingering cough and tiredness can last a few more weeks.

  • No antibiotics

    The NHS says antibiotics do not work for viral infections such as flu, and GPs do not recommend them for flu.

  • Spread

    The NHS says you are more likely to give flu to others in the first 5 days after getting infected.

  • Vaccine

    The NHS says the children's flu vaccine is offered to children aged 2 to 3, school-aged children (reception to year 11) and children with certain long-term conditions, mostly as a nasal spray.

What flu looks like in a child

The NHS lists a sudden high temperature, an aching body, feeling tired or exhausted, a dry cough, sore throat, headache, difficulty sleeping and loss of appetite. It says the symptoms are similar in children but they can also get pain in the ear, sore eyes, swollen glands and appear less active. NHS inform adds chills, a runny or blocked nose, sneezing, diarrhoea or tummy pain, and feeling or being sick.

Because flu viruses change regularly, NHS inform says you can catch flu many times as the body will not have natural resistance to new versions.

Telling flu from a cold

Both are viral and similar at first. The NHS describes the difference as follows.

Flu compared with a cold (NHS)
FluCold
OnsetWithin a few hoursGradually, over 1 to 2 days
AffectsMore than the nose and throatMainly the nose and throat
EffectExhausted, too unwell to carry on as normalUnwell but still able to do normal activities

Caring for a child with flu at home

The NHS suggests rest and sleep, paracetamol or ibuprofen if the child is distressed or uncomfortable (checking the packaging is suitable for the child, or asking a pharmacist or GP), and plenty of water to avoid dehydration, with urine light yellow or clear. It says not to give aspirin to children under 16, and not to take paracetamol together with flu remedies that contain paracetamol, because it is easy to take more than the recommended dose. NHS inform recommends keeping warm and staying off school until the child feels better.

The NHS says antibiotics do not work for viral infections such as flu and GPs do not recommend them because they will not relieve symptoms or speed up recovery.

When to get help

The NHS says to ask for an urgent GP appointment or get NHS 111 help if a child has flu symptoms and you are worried about your baby's or child's symptoms, they have a long-term medical condition such as diabetes or a condition affecting the heart, lungs, liver, kidneys, brain or nerves, a weakened immune system, feel very unwell, feel short of breath, or symptoms do not improve after 7 days. It says to call 999 or go to A&E for sudden chest pain, severe difficulty breathing or coughing up blood.

NHS inform adds, for children, signs that call for urgent GP contact including being more short of breath than usual, pain breathing in or coughing, confusion or dizziness, being unable to keep fluids down, and peeing less than usual as a sign of dehydration; and for 999, severe difficulty breathing, drowsiness, and lips or skin turning very pale, blue or grey.

Children at higher risk and complications

NHS inform says flu can affect any age but is more common and more serious in babies and young children, older people, pregnant women and people with other conditions such as asthma, cystic fibrosis, or heart, kidney or liver conditions or a weakened immune system. People in these groups are more likely to need hospital treatment or antiviral medication. Complications include pneumonia or worsening of lung problems, usually after a few days of symptoms. The NHS says each winter in the UK, thousands of children who do not have a health condition need hospital care because of flu.

The children's flu vaccine

The NHS says the vaccine is offered every autumn or early winter to children aged 2 or 3 on 31 August of that year, children aged 4 who have not started school, school-aged children from reception to year 11, and children aged 6 months to 17 with certain long-term conditions, including asthma needing steroid inhaler or tablets, cystic fibrosis, serious heart conditions, kidney or liver disease, some conditions affecting the brain or nerves such as cerebral palsy, diabetes, a weakened immune system and problems with the spleen such as sickle cell disease. Eligibility dates change each year, so check the current NHS page.

Most children are offered a nasal spray, the preferred vaccine for ages 2 to 16, which contains porcine gelatine; an injected vaccine without gelatine is available and is offered to under-2s and children who cannot have the spray. The NHS says to wait if the child has a high temperature or a very blocked nose, that the usual side effects are mild and settle in 1 to 2 days, and that you cannot get flu from any flu vaccine.

Spreading flu and school attendance

The NHS says flu is spread by germs from coughs and sneezes, which can live on hands and surfaces for 24 hours, so washing hands, covering coughs and sneezes with a tissue and binning tissues help. UKHSA says infected people should stay away from the setting until they are better and no longer have a temperature, and that settings should contact the health protection team only if there is increasing absence or serious illness.

Frequently asked

Questions people ask.

Quick, plain-English answers to the questions we hear most.

  • How long does flu last in a child?

    NHS inform says most people feel better within a week, but a lingering cough and tiredness can last a few more weeks. The NHS says to ask for an urgent GP appointment or call 111 if symptoms do not improve after 7 days.

  • Is it flu or a cold?

    The NHS says flu appears within a few hours, affects more than the nose and throat and leaves a child exhausted, while a cold comes on gradually and mainly affects the nose and throat.

  • Do antibiotics help?

    No. The NHS says antibiotics do not work for viral infections such as flu and GPs do not recommend them for flu.

  • When can my child go back to school?

    UKHSA says infected people should stay away until they are better and no longer have a temperature. NHS inform says to stay off school until feeling better.

  • Who is offered the children's flu vaccine?

    The NHS lists children aged 2 or 3, 4-year-olds not yet at school, school-aged children from reception to year 11, and children aged 6 months to 17 with certain long-term conditions. Dates change each year.

  • What is the nasal spray vaccine?

    The NHS says it is a quick, painless spray in each nostril and the preferred vaccine for ages 2 to 16. It contains a small amount of porcine gelatine, and an injection without gelatine is available.

  • Can the vaccine give my child flu?

    No. The NHS says you cannot get flu from any of the flu vaccines. Common side effects are mild and get better in 1 to 2 days.

  • Should the vaccine be delayed if my child is ill?

    The NHS says if a child has a high temperature, wait until they feel better, and a very blocked or runny nose may mean waiting for the spray or being offered an injection instead.

  • Why vaccinate healthy children?

    The NHS says flu can be very unpleasant and sometimes cause pneumonia, thousands of otherwise healthy children need hospital care each winter, and vaccinating children also helps protect babies, pregnant people and older people.

  • What fluids are best?

    The NHS says drink plenty of water to avoid dehydration, with light yellow or clear urine as the sign. NHS inform notes that peeing less than usual can be a sign of dehydration.

Where this comes from

Sources and checking.

This guide is for information, not medical advice.

Your GP or consultant knows your history and can tell you which parts apply to you. If your symptoms are severe, rapidly worsening, or come with red-flag features, seek urgent medical care. Figures and availability change, so treat them as a guide and confirm with the provider.

Published 2026-10-04, next review 2027-10-04.