When should I worry about a fever?

Concerns & risks

You were trying to take care of yourself or your kid, but the thermometer reads higher than you expected, and now you're wondering whether to wait it out or call someone.

Some fevers need care right away.

Causes & evidence

Fevers are common with infections. Warning signs matter more than the number. See fever basics. If symptoms are severe, sudden or getting worse, contact a doctor or emergency services.

What to do

1. Rest and drink fluids.
2. Use fever reducers as the label says, if appropriate.
3. Seek care if fever lasts several days or is very high.
4. Get emergency help for stiff neck, confusion, trouble breathing or a fever in a young baby.

Common mistakes: Common mistakes: focusing only on the number and not how the person looks and acts. Watch for trouble breathing, confusion, stiff neck, rash, dehydration or a fever that lasts. Babies are different: a fever in a young infant needs a call to the doctor right away. Don't give aspirin to children or teens. Use the right dose of fever reducer for weight or age, and don't double up on products with the same ingredient. When unsure, call your provider or nurse line.

Speed Man tip: Babies under 3 months with a fever should be checked by a doctor promptly.

Wrap-up: Watch symptoms, not just the number. Rest and fluids. Babies and red flags need care.