Myocarditis and Pericarditis

This information can change. Please double check resources and continue to monitor them for up to date information.

CDC and its partners are actively monitoring reports of myocarditis and pericarditis after COVID-19 vaccination. Active monitoring includes reviewing data and medical records and evaluating the relationship to COVID-19 vaccination.

Myocarditis is inflammation of the heart muscle, and Pericarditis is inflammation of the outer lining of the heart. In both cases, the body’s immune system causes inflammation in response to an infection or some other trigger. Seek medical care if you or your child have symptoms of these conditions within a week after COVID-19 vaccination.



Both myocarditis and pericarditis have the following symptoms:

  • Chest pain
  • Shortness of breath
  • Feelings of having a fast-beating, fluttering, or pounding heart

Symptoms typically emerge within a week of receiving an mRNA vaccine (Moderna or Pfizer), and tend to be more common in male adolescence and young adults. It is more likely to occur after the second dose than the first, but is still a rare side effect.  Patients who receive treatment for myocarditis or pericarditis tend to respond well and are able to return to normal activities when their symptoms improve. The CDC is also investigating any long term side effects of myocarditis and pericarditis and may contact people who have been diagnosed with the condition.


Should I still myself or my child vaccinated?

Yes, the CDC is still recommending that everyone ages 12 and older get vaccinated for COVID-19. the known risks of COVID-19 illness and its related, possibly severe complications, such as long-term health problems, hospitalization, and even death, far outweigh the potential risks of having a rare adverse reaction to vaccination, including the possible risk of myocarditis or pericarditis.

For more information about myocarditi and pericarditis you can click here for the CDC website, or click here for the National Heat, Lung and Blood Health website.