Free guide · Scarlet Beast En español →
Flu: the signs, early treatment, the emergency warning signs, and the flu vaccine
For anyone with flu symptoms, or caring for someone who has them. CDC says flu usually comes on suddenly, that most people get better at home in a few days to less than two weeks, and that some people get very sick. This page passes on, by name, what eight CDC flu pages say: who should call a provider early (antiviral drugs work best when started within 2 days), CDC’s emergency warning signs for children and adults, flu or a cold, how long it spreads, when to go back to work or school, no aspirin for children and teens, and the yearly flu vaccine. It builds the words to say to a doctor’s office, work, a school or shelter staff, and prints a card of the dates to keep.
A word with a dotted line under it, like this, opens its official definition, quoted from a U.S. government glossary.
Right now
- Someone cannot breathe, is turning blue, has a seizure, or cannot be woken: call 911 now (that line is ours).
- Trouble breathing, chest pain or pressure, confusion, not urinating, or a fever or cough that got better and then came back worse? These are on CDC’s emergency warning signs: CDC says get medical care right away. CDC’s full lists for children and adults are below, under “The emergency warning signs”.
- A baby younger than 12 weeks with any fever? That is on CDC’s list too.
- 65 or older, pregnant, a young child, or a long-term condition such as asthma, diabetes or heart disease? CDC says call your provider early: antiviral drugs work best when started within 2 days after symptoms begin.
More help
- A child who is sick: Coughs and colds in a baby or child · Fever in a baby or child · Whooping cough · All our pages on a baby’s or child’s health.
- Pregnant: Pregnant, or with a new baby. No insurance: When you need a doctor and can’t pay.
- The same season: COVID-19: the emergency signs, testing and treatment · RSV in babies and older adults. Never got better after COVID-19: When it’s Long COVID. A place to stay: A place to stay.
- All our free tools.
Looking after a baby or child? The pages on this site for a baby or child, on one list.
This page and its wording were written with AI (Claude) for Scarlet Beast (our AI policy). No doctor or nurse has reviewed it. The facts were read on October 14, 2026 on eight CDC flu pages on cdc.gov: About Influenza, Signs and Symptoms of Flu, How Flu Spreads, Treatment of Flu (updated September 2, 2025), Flu: What To Do If You Get Sick, People at Increased Risk for Flu Complications, Key Facts About Seasonal Flu Vaccine and Healthy Habits to Prevent Flu (both updated September 1, 2026). Ours: the 911 line (CDC says people with its emergency warning signs should go to the emergency room), asking shelter staff for a place apart, asking a health department about cost, and the order of the steps. What we left out: antiviral and vaccine brand names, cold and flu medicines and home remedies, case counts, and CDC’s pages for clinicians. This page saves nothing and loads no trackers.