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How do you know if your child has the flu?
Flu in kids: how it differs from a cold, who should get antiviral medicine early, home care for fever and aches, emergency signs, and the yearly flu shot.
The short answer
Flu usually hits suddenly: high fever, chills, body aches, headache, tiredness, dry cough and sore throat, sometimes vomiting in younger kids. A cold builds slowly and is milder. Call the doctor early, ideally within 48 hours, because antiviral medicine works best when started fast. Seek care right away for fast or hard breathing, bluish lips, dehydration, or a fever that returns after improving.
Your child probably has the flu if they go from fine to sick within hours, with a high fever, chills, body aches, headache, exhaustion, a dry cough and sore throat; younger children may also vomit or have diarrhea. A cold creeps in with a runny nose and is milder. Call your doctor early, because antiviral medicine works best in the first 48 hours. KidsHealth's flu guide says flu is caused by influenza viruses and that children under 5, and kids with conditions like asthma, are more likely to have complications (Flu, accessed November 12, 2026).
Flu or cold?
| Flu | Cold | |
|---|---|---|
| Start | Sudden, within hours | Gradual, over a day or two |
| Fever | Common, often 102°F or higher | Low or none |
| Aches and chills | Common, can be strong | Mild |
| Tiredness | Wiped out, may last weeks | Mild |
| Runny nose | Sometimes | Very common |
| Child's own words | "Everything hurts" | "My nose is stuffy" |
A rapid flu test at the doctor's office, done with a nose swab, can confirm it in minutes. Many offices now test for flu, COVID and RSV with the same swab.
Antiviral medicine
Oseltamivir (Tamiflu) and similar medicines shorten flu and lower the chance of complications. They work best started within 48 hours of the first symptoms. Doctors generally recommend them for children under 5, children with asthma, diabetes, heart or lung disease, weakened immune systems, or anyone very sick or in the hospital. Older healthy kids may get them too, depending on timing.
Side effects can include nausea and vomiting; giving the dose with food helps. The liquid tastes bitter, so ask the pharmacist about flavoring.
Antibiotics don't treat flu. They're only used if a bacterial infection like an ear infection or pneumonia follows.
Caring for flu at home
- Rest. Couch days are expected. Flu tiredness can linger after the fever goes.
- Fluids. Water, broth, popsicles, oral rehydration drinks. Small, frequent sips.
- Fever and aches. Acetaminophen or ibuprofen, dosed by weight, can make your child comfortable. KidsHealth's fever guide notes that no treatment is needed if a child with a fever is still playing, drinking normally, and seems comfortable (Fever, accessed November 12, 2026). Never give aspirin to children or teens. Our guide to giving a toddler liquid medicine shows how to measure a dose with a syringe.
- Cough. Honey for kids over 1 year. Cough and cold medicines aren't recommended for young children.
- Humid air. A cool-mist humidifier for a stuffy nose.
Emergency warning signs
Get medical care right away, or call 911, if your child has:
- fast breathing, working hard to breathe, or ribs pulling in with each breath;
- bluish lips or face;
- chest pain;
- severe muscle pain or refusing to walk;
- signs of dehydration, like no urine for 8 hours, a dry mouth, or no tears;
- not waking up or not interacting when awake;
- a seizure;
- fever above 104°F;
- in babies under 12 weeks, any fever;
- fever or cough that improves, then comes back worse;
- worsening of asthma or another chronic condition.
That last one matters: a second wave of fever after a few better days can signal pneumonia or an ear infection.
How long it lasts and when to go back
Fever usually lasts 3 to 5 days. Cough and tiredness can hang on for one to two weeks. Kids can generally go back to school or daycare once they've been fever-free for 24 hours without fever-reducing medicine and are feeling better. Check your school's rule.
Protecting the rest of the family
- Wash hands with soap often, especially before meals.
- Cough and sneeze into elbows; toss tissues right away.
- Keep the sick child's cup, towel and toothbrush separate.
- Wipe doorknobs, remotes and faucet handles.
- Ask the doctor whether family members at high risk, like a baby or a grandparent, should take preventive antiviral medicine.
The flu shot
A yearly flu vaccine is recommended for everyone 6 months and older. Children 6 months through 8 years getting it for the first time need two doses, four weeks apart. The nasal spray is an option for many healthy kids 2 and up. Getting vaccinated early in the fall is ideal, but it's still worth it later in the season. For needle nerves, our page on getting a shot at the doctor has scripts.
Helping a miserable kid
Flu feels terrible. Audiobooks, a pile of picture books, and a parent nearby help. If flu turns into a hospital stay, children often want to talk about it later. A personalized getting-better book can retell the stay with your child in the pictures. See the hospital book.
Keeping track at home
When a child has the flu, the days blur together. A simple log on your phone helps you and the doctor:
- temperature and the time you took it;
- each dose of fever medicine, with the time and amount;
- how much your child drinks and how many wet diapers or bathroom trips;
- new symptoms, like ear pain or a worse cough.
This keeps you from doubling a dose by mistake, and it shows quickly whether your child is improving or getting worse. If a fever goes away for a day and then comes back, or the cough gets worse after seeming better, call the doctor. That pattern can mean a second infection, such as an ear infection or pneumonia.
Related reading
FAQ
Can a child get the flu twice in one season?
Yes. Different flu strains circulate.
Does the flu shot cause the flu?
No. The shot can't cause flu; some kids get a sore arm or a low fever for a day.
Is stomach flu the same thing?
No. "Stomach flu" is usually a different virus that causes vomiting and diarrhea.
