http://www.newsweek.com/israel-pfizer-vaccine-what-myocarditis-heart-inflammation-1586363

Israel's health ministry has said it is investigating a small number of cases of myocarditis—heart inflammation—in people who have received the Pfizer COVID vaccine.

It is not yet clear whether the number of myocarditis cases is higher than would be expected in the general population, or whether the cases are connected to the vaccine, according to Nachman Ash, Israel's pandemic response coordinator.