The Food and Drug Administration (FDA) has expanded its warnings on Pfizer and Moderna COVID-19 vaccines about the risks of two heart conditions. These manufacturers, the two main COVID-19 vaccine providers,

U.S. health officials have expanded warnings about a rare heart side effect associated with the two leading COVID-19 vaccines.

The FDA has updated labels on the top two COVID-19 vaccines to warn of a rare heart side effect, mostly seen in young men. Here's what to know.