Studies and reports have shown that there might be an association between the development of Myocarditis and the receipt of mRNA vaccines used against COVID-19. However, the severity and frequency of Myocarditis post vaccination has not been studied extensively to draw a conclusion.
Myocarditis and pericarditis, are an inflammation of the muscles in the heart, or the area around the heart. It can be caused by a number of things, however, it is often undetected due to the nature of where it is and the symptoms. Arrhythmia and other heart related symptoms may develop, but often are not correctly attributed, leading to potential long term damage. A biopsy is needed to come up with an accurate plan, so because of this, many cases go undiagnosed.
However, they have found signs of myocarditis in many surprise passings of people under 30. And due to the nature of testosterone, males have a harder time with it, similar to what we are seeing in the vaccine statistics.