As shown in the results of clinical trials, more serious or long-lasting side effects are possible. Like any vaccine, COVID-19 vaccines can cause side effects, most of which are mild or moderate and go away within a few days on their own. Experiencing no side effects doesn’t mean the vaccine is ineffective. These side effects usually go away on their own after a few days.Ĭommon and mild or moderate side effects are a good thing: they show us that the vaccine is working. Response), and is gearing up to fight the virus. Mild-to-moderate side effects, like a low-grade fever or muscle aches, are normal and not a cause for alarm: they are signs that the body’s immune system is responding to the vaccine, specifically the antigen (a substance that triggers an immune This is because your immune system is instructing your body to react in certain ways: it increases blood flow so more immune cells can circulate, and it raises your body temperature in order to kill the virus. It’s common to experience some mild-to-moderate side effects when receiving Vaccines are designed to give you immunity without the dangers of getting the disease. Why it’s normal to have mild side effects from vaccines ![]() ![]() You may experience some mild side effects after getting vaccinated, which are signs that your body is building Learn more about vaccines – from how they work and how they’re made to ensuring safety and equitable access – in WHO’s Vaccines Explained series.ĬOVID-19 vaccines are safe, and getting vaccinated will help protect you against developing severe COVID-19 disease and dying from COVID-19. ![]() This article is part of a series of explainers on vaccine development and distribution.
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