evidence: Why get vaccinated against COVID-19? [...] What to expect after getting vaccinated - Some people will experience mild side effects after being vaccinated against COVID-19. Common side effects of COVID-19 vaccines include fever, head or body aches and a sore arm. These symptoms usually go away within a day or two and, if needed, can be managed by getting some rest, drinking fluids, or taking pain-relieving medications. [...] If you do get COVID-19 after vaccination, you are more likely to have mild or no symptoms than if you hadn’t been vaccinated.