It's inflammation of the heart muscle. https://www.cdc.gov/coronavirus/2019-ncov/vaccines/safety/myocarditis.html https://www.cdc.gov/coronavirus/2019-ncov/vac

It's inflammation of the heart muscle. https://www.cdc.gov/coronavirus/2019-ncov/vaccines/safety/myocarditis.html https://www.cdc.gov/coronavirus/2019-ncov/vaccines/safety/my... There is a wealth of info about this known condition on the web including symptoms and treatment. If you have concerns, ask your GP, they're there to help you.