This usually happens within 2 days (48 hours) of getting the vaccine. It usually goes away within 2 days.
You are more likely to get a fever after the second dose of your vaccine.
If you feel uncomfortable, take Paracetamol or Ibuprofen following the instructions on the box or leaflet.
If your fever starts more than 2 days after you are vaccinated, or lasts longer than 2 days, you should self-isolate (stay in your room). Phone your GP to arrange a COVID-19 test.