The CDC has reported higher-than-usual cases of myocarditis after vaccination, overwhelmingly in young men under 30.
So far 226 cases of myocarditis have been reported in men under 30 where the CDC was expected fewer than 100 cases for this age group.
Problems are most common after the second dose of an mRNA vaccine but the CDC said more research is necessary to determine if the vaccine is the cause of the problem.
Teenagers and people in their early 20s accounted for more than half of the myocarditis cases reported to the CDC’s safety monitoring systems following Covid-19 vaccination, despite representing a fraction of people who have received the shots.
Evidence grows stronger for Covid vaccine link to heart issue, CDC says
Myocarditis is inflammation of the heart muscle. Most cases were mild and went away on their own. Fifteen patients are still hospitalized with three still in the ICU.