Two studies in the New England Journal of Medicine (NEJM) and a research letter in JAMA Internal Medicine this week found that myocarditis—inflammation of the heart muscle—following COVID-19 mRNA vaccination is rare and usually mild.Younger men seemed to be at increased risk of the condition, however, and today Finland joined Sweden and Denmark in pausing the Moderna vaccine among young men after a Nordic study found a slightly elevated risk in that demographic.On Jun 25, the US Food and Drug Administration added a warning to the fact sheets for the Pfizer/BioNTech and Moderna mRNA-based COVID-19 vaccines about both myocarditis and pericarditis (inflammation of the tissue surrounding the heart).Myocarditis in IsraelIn a nationwide