US CDC Probes into Heart Problem in Vaccinated Teens by Angela Mohan on May 27, 2021 at 10:39 AM CDC looks into "relatively few reports" of possible link between heart problem and COVID vaccines in young people, doctors suggest people should pay close attention to possible symptoms, like chest pain and shortness of breath. However, It still remains unclear whether the vaccine is the cause of the heart problem called myocarditis, reports NBC News, quoting health experts. The report said it identified at least 55 suspected cases in the US. "Reported cases appear to be mild and often go away without requiring treatment." Myocarditis and pericarditis are conditions that involve inflammation in and around the heart.