Like all medicines, the flu vaccine can cause side effects. They're usually mild and normally last only a day or two. It’s normal to experience side effects after a vaccine. It shows the vaccine is teaching your body’s immune system how to protect itself from the disease. But not everyone gets side effects.
Side effects are usually mild and may include:
tenderness, swelling and/or redness at the site of the injection
fever (temperature 38°C or above)
You may also feel generally unwell. These common side effects are much less serious than developing flu or complications associated with flu, and they usually go away within a few days.
You can rest and take the normal dose of paracetamol (follow the advice in the packaging) to help make yourself feel better.
Phone 111 if:
You're concerned about yourself or anyone else in your household who is unwell following a vaccination.
Where can I report suspected side effects?
You can report suspected side effects of vaccines and medicines through the Yellow Card Scheme.