Influenza
Influenza, commonly known as the flu, is a contagious respiratory illness caused by influenza viruses. It can cause mild to severe illness, and in some cases can become serious, especially for young children and those with underlying conditions. The flu is different from a cold and usually comes on suddenly.
Common symptoms
- Fever or feeling feverish/chills
- Cough
- Sore throat
- Muscle or body aches
- Headaches
- Extreme fatigue
- Vomiting and diarrhea (more common in children than adults)
Cause
Influenza is caused by influenza viruses, which are highly contagious and spread through respiratory droplets when an infected person coughs, sneezes, or talks.
How common is it?
Seasonal flu affects approximately 20-30% of U.S. children each year. According to CDC estimates, children experience the highest rates of flu infection and account for significant emergency department visits and hospitalizations during flu season (October-May). Annual vaccination is recommended for all children 6 months and older.
Treatment
Treatment for the flu primarily focuses on relieving symptoms. This includes ensuring your child gets plenty of rest, drinks lots of fluids to prevent dehydration, and using over-the-counter medications like acetaminophen or ibuprofen for fever and aches (avoid aspirin in children). In some cases, a doctor may prescribe antiviral medications, especially if started early in the illness.
What parents keep on hand
These are everyday supplies parents tell us they like to have on hand, not medical advice. Nothing here diagnoses or treats anything. Always follow your pediatrician's guidance, and check labels for your child's age and weight.
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- ThermometerA reading you trust settles most of the should-we-call-the-doctor debate. One is enough, so pick the style that suits your child's age.
- Kids' fever and pain relieverHave both acetaminophen and ibuprofen options on hand and dose by weight.
- Saline nose spray or dropsLoosens a stuffy nose for babies and toddlers who can't blow yet.
- Cool-mist humidifierHelps a night-time cough and a dry throat.
Frida Baby 3-in-1 Cool Mist HumidifierLarge-room cool mist with 60-hour runtime, a calming nightlight, and an essential oil diffuser. Auto shut-off and a carry handle make nursery use simple.
Crane Ultrasonic Cool Mist HumidifierQuiet ultrasonic mist for a baby nursery or kids' room. One-gallon tank runs up to 24 hours; filter is optional to save on replacements.
Prevention
The most effective way to prevent the flu is to get an annual flu vaccine for your child and yourself. Encourage frequent handwashing with soap and water, and teach your child to cover their mouth and nose with a tissue or their elbow when coughing or sneezing. Avoid close contact with people who are sick, and keep your child home from school or daycare when they are ill to prevent spreading the virus.
See what's going around
Track Influenza and other illnesses at your child's school in real time.
Frequently asked questions
Influenza articles for parents
- September 2026How Long Is the Flu Contagious? A Day-by-Day Timeline for ParentsKids spread flu before the first symptom and for days after. Here's the contagious window, day by day, plus when it's genuinely safe to go back to school.
- September 2026Flu A vs Flu B: What the Letter on Your Child's Test Actually MeansThe lab says flu A. Or flu B. Here's what that letter actually tells you about symptoms, timing, treatment, and when your kid can go back to school.
- January 2026Chicago Flu Season 2025-2026: H3N2 Strain DominatesInfluenza A H3N2 is the dominant flu strain in Chicago this season. Learn about symptoms, treatment, and when to get vaccinated.
- December 2025How to Prepare for Cold & Flu SeasonTips from Chicago parents on stocking up, staying healthy, and managing sick days when they happen.
Related illness guides
Medical disclaimer: Educational only. Always consult a healthcare provider for diagnosis and treatment.





