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Centers for Disease Control and Prevention (CDC). Since April 2021, some people have developed myocarditis (inflammation of the heart muscle) and pericarditis (inflammation of the lining outside the heart) after receiving the Pfizer-BioNTech or Moderna coronavirus vaccines in the United States, according to the U.S. Rare Side Effects of COVID Vaccines Myocarditis and the COVID-19 Vaccines They signal that your immune system is responding to the shot and building up protection against the coronavirus.
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Chills and swollen lymph nodes can also occur. You might run a fever and experience body aches, headaches and tiredness for a day or two. Common Side Effects of COVID VaccinesĪfter getting vaccinated for COVID-19, you might experience some temporary symptoms similar to those you might notice when you get a flu shot, such as a sore, swollen arm where you got the shot. Lisa Maragakis, M.D., M.P.H., senior director of infection prevention, and Gabor Kelen, M.D., director of the Johns Hopkins Office of Critical Event Preparedness and Response, help you understand side effects associated with the COVID-19 vaccines. Serious or persistent side effects associated with the approved or authorized vaccines are extremely rare. for COVID-19, the side effects, if any, have been mild. For the vast majority of people already vaccinated in the U.S. It’s helpful to understand side effects before you get a COVID-19 vaccine.