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.
Many things can cause a high temperature, but it's usually caused by your body fighting an infection.
You may have a high temperature if:
A high temperature could be COVID-19.
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.
If you feel hot or shivery, you may have a high temperature even if a thermometer says your temperature is below 38C.
It can help to:
This page is for adults. For advice about children, see fever in children.