Like all medicines, vaccines can cause side effects. Most of these are mild and short term, and not everyone gets them. Even if you do have symptoms after the first dose, you still need to have the second dose. Although you may get some protection from the first dose, having the second dose will give you the best protection against the virus.
Very common side effects include:
Although feeling feverish is not uncommon for two to three days, a high temperature is unusual and may indicate you have COVID-19 or another infection. You can rest and take the normal dose of paracetamol (follow the advice in the packaging) to help you feel better. Symptoms following vaccination normally last less than a week. If your symptoms seem to get worse or if you are concerned, call NHS 111.
If you do seek advice from a doctor or nurse, make sure you tell them about your vaccination (show them the vaccination card if possible) so that they can assess you properly. You can also report suspected side effects to vaccines and medicines through the Yellow Card scheme.