What should you know about maximum fever temperature?

There is no single maximum fever temperature that predicts the cause; the reading, age, symptoms and overall condition all guide urgency. A fever is the body's response to illness, but a very high or persistent temperature needs careful attention.

Temperature varies with the measurement site, device and time of day. Record the number, method and time rather than relying on how warm the skin feels. Fever may accompany a Common Cold, Acute Bronchitis, COVID-19, Chickenpox or another infection. In babies, older adults, pregnant people and those with weakened immunity, concerning illness can occur without a dramatic reading.

Rest, drink regular fluids and wear light, comfortable clothing. Use a reliable thermometer according to its instructions and recheck if the person seems worse. Fever medicine may improve comfort, but follow the product label and check with a pharmacist if the person is a child, pregnant, dehydrated or taking other medicines. Do not use cold baths or alcohol rubs.

Get urgent help for trouble breathing, a seizure, confusion, a stiff neck, a severe headache, blue or grey lips, a widespread concerning rash, severe dehydration or difficulty waking. Seek prompt advice for a very young baby with fever, a fever that persists or returns, or a person who is becoming markedly unwell. Fever with a painful, spreading skin area may need assessment for Cellulitis.

Ask which thermometer method is most useful, how often to check the temperature, which medicine and dose fit the person's age and health, and which symptoms should trigger urgent review. Share the temperature log and any recent travel, exposure or new rash.