Some COVID-19 shots may be linked to rare heart problems in teens, CDC says

The FDA on Wednesday said it plans to add a warning to Pfizer and Moderna vaccines after a CDC advisory panel said data suggests a "likely association" between the vaccines and rare cases of heart inflammation in adolescents and young adults. Despite the warning, doctors and researchers say they still strongly recommend that all Americans 12 and older get vaccinated, noting that the heart problems are uncommon and in most cases very mild. 

The CDC tracked more than 1,200 cases of myocarditis, which is inflammation of the heart muscle, and pericarditis, which is inflammation of the outer lining of the heart. More than 800 of the cases occurred after the second dose, and 65% were linked to the Pfizer vaccine. The largest share of the cases occurred in men under the age of 24, according to the report.  Sixteen-year-old Noah Hiers was rushed to the hospital just two days after receiving his second dose of the Pfizer vaccine.