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High temperature (fever) in adults
What is a high temperature?

Normal body temperature is different for everyone and changes during the day.

A high temperature is usually considered to be 38C or above. This is sometimes called a fever.

Check if you have a high temperature

You may have a high temperature if:

  • your chest or back feel hotter than usual
  • you have other symptoms, such as shivering (chills), sweating or warm, red skin (this may be harder to see on black or brown skin)
  • a thermometer says your temperature is 38C or above

Important

If you feel hot or shivery, you may have a high temperature even if a thermometer says your temperature is below 38C.

Do I need to take my temperature?

You do not need to take your temperature using a thermometer, but you can if you have one.

Make sure you use it correctly to help get an accurate result. See how to take a temperature.

Treating a high temperature

There are some things you can do to help treat a high temperature.

Do

  • get lots of rest

  • drink plenty of fluids (water is best) to avoid dehydration – drink enough so your pee is light yellow and clear

  • take paracetamol or ibuprofen if you feel uncomfortable

Try to stay at home and avoid contact with other people until you do not have a high temperature.

Ask for an urgent GP appointment or get help from NHS 111 if you have:

  • a high temperature and you've been treating it at home but it's not getting better or is getting worse

You can call 111 or get help from 111 online.

Causes of a high temperature

Many things can cause a high temperature. It's not usually a sign of anything serious.

It's often just caused by your body fighting an infection, such as a cold or flu.

Sometimes it could be a sign of something more serious if your temperature is very high or will not come down.

Advice for children

This page is for adults. For advice about children, see high temperature (fever) in children.

Last Reviewed
26 May 2023
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