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This page provides general information about fever. If you have a child with a fever, see fever in children.
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A fever (high temperature – 38 degrees Celsius or above) can be a sign of COVID-19.
Compare the symptoms of COVID-19, flu and cold
Your body’s normal temperature is between 36 and 36.8 degrees Celsius.
A high temperature or fever, for most people, is when your body temperature is 38 degrees Celsius or higher. This can be a sign that you are unwell. It usually means you have an infection such as a cold. But it can also be due to more serious infections, such as coronavirus.
For more information, see our Coronavirus symptoms page
Even if you don’t have a high temperature you may still be seriously ill. So it”s important to look at all your symptoms.
A fever is usually caused by your body fighting a viral or bacterial infection.
A fever usually lasts 3 to 5 days and most people will recover from a mild fever with self-care at home.
Symptoms
Mild fever (38 to 38.9 degrees Celsius)
With a mild fever you might have flushed cheeks, feel tired and be warm to touch. You will generally be able to carry out normal daily activities.
High fever (39 to 39.9 degrees Celsius)
With a high fever, you’ll feel hot to touch. You may not feel well enough to go to work and you may have aches and pains.
Very high fever (40 degrees Celsius or higher)
With a very high fever, you will usually want to stay in bed or be inactive – you won’t feel well enough to carry out normal activities. You’ll feel hot to touch and you may have lost your appetite.
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When to see a GP
Young babies and pregnant women
Babies under 3 months old with fever must be checked by your GP. Contact your GP if your baby is between 3 and 6 months and has a high or very high fever. Read more about fever in children.
If you’re pregnant and have a temperature of 38.5 degrees Celsius, or any fever lasting for 3 days or more, see your GP. They need to monitor the effects of the fever on your baby.
Other ages
Older infants, children and adults will not usually need any medical treatment for mild fever, especially if you are otherwise well.
You should contact your doctor if you:
have a very high fever (over 40 degrees Celsius)are still feverish after 3 days of home treatment or seem to be getting sickerare shivering or shaking uncontrollably, or have chattering teeth, and it doesn’t stop within an hour or sohave a severe headache that doesn’t get better after taking painkillersare having trouble breathingare getting confused or are unusually drowsyhave recently travelled overseas
Contact your GP immediately if you notice the following symptoms (along with a fever):
severe headachestiff necksensitivity to light
These symptoms may be a sign of meningitis. This needs urgent medical attention.
Causes of fever
Fever is usually caused by a viral or bacterial infection. Fever is your body”s way of fighting infection. Raising the temperature inside your body helps to kill the virus or bacteria causing the infection.
Common conditions that can cause fevers include:
respiratory tract infectionsflu (influenza) and flu-like conditionscoldstummy bugs (gastroenteritis)ear infectionsinfection of your tonsils (tonsillitis)kidney or urinary tract infectionscommon childhood illnesses, such as chickenpox, scarlet fever, rubella (German-measles), whooping cough and rheumatic fever
You might have a mild fever after getting a vaccine.
Adults should not take paracetamol before or after getting a vaccine. It may make the vaccine less effective.
Treatment
Medication for fever
Fever is your body’s way of fighting infection. Medication is not needed for mild fever, but you can use paracetamol if you also have a headache, pain or distress.
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Self management
Get plenty of rest. Sleeping for 2 to 3 hours at a time is slightly better than just resting.Make sure the room temperature is comfortable – not too hot or too cold.If possible, open a window for ventilation but avoid draughts.Wear lightweight clothing and use lighter bedding.Do not use hot water bottles or electric blankets.Use a cool cloth to wash face, hands and neck.Change bed linen and clothing regularly.
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