The CDC had this to say about it
https://www.cdc.gov/coronavirus/2019...ocarditis.html
Quote:
Most patients with myocarditis or pericarditis after COVID-19 vaccination responded well to medicine and rest and felt better quickly.
Myocarditis and pericarditis after COVID-19 vaccination are rare. 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
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They still recommend people get vaccinated against COVID-19. They are all still continuing to study it.
However as with any medication or vaccine there are always varying side effects.