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A fever is a high body temperature. It's one way your body fights illness. A temperature of up to 38.9°C can be helpful, because it helps the body respond to infection. Most healthy people can have a fever as high as 39.4°C to 40°C for short periods of time without problems. In most cases, a fever means that you have a minor illness.
Follow-up care is a key part of your treatment and safety. Be sure to make and go to all appointments, and call your doctor or nurse advice line (811 in most provinces and territories) if you are having problems. It's also a good idea to know your test results and keep a list of the medicines you take.
Call your doctor or nurse advice line now or seek immediate medical care if:
Watch closely for changes in your health, and be sure to contact your doctor or nurse advice line if:
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Current as of: March 9, 2022
Author: Healthwise Staff
Medical Review:Heather Quinn MD - Family Medicine & Brian D. O'Brien MD - Internal Medicine
Care instructions adapted under license by your healthcare professional. If you have questions about a medical condition or this instruction, always ask your healthcare professional. Healthwise, Incorporated disclaims any warranty or liability for your use of this information.
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