Most symptoms happen in the first two days after vaccination, with headache, fatigue and chills or shivers being the most common. Almost one in five (19.9%) of the participants under 55 years old were likely to experience after-effects, compared to around one in ten (9.6%) over 55s.

Is it normal to feel sick after getting the COVID-19 vaccine?

It is normal to feel sick after getting a COVID-19 vaccine.
You may have a sore arm.
Put a cool, wet cloth on your sore arm.

Does COVID-19 vaccine have side effects?

COVID-19 vaccines are safe and effective. Vaccines cannot give you COVID-19. You may have side effects after vaccination. These are normal, and should go away in a few days.