RNA vaccines can cause serious side effects in men and increase the risk of myopericarditis, a disease characterized by inflammation of the heart muscle and surrounding tissues, researchers at the National University Hospital, Singapore, said.

The results of their study were published in the journal Lancet Respiratory Medicine.

The authors of the study wanted to find out how often vaccinations against coronavirus infection lead to the development of cardiovascular disease. To do this, they analyzed data from 395 million vaccinated people who lived in different parts of the world and had been vaccinated in the past two years.

It turned out that the chances of getting myopericarditis do increase with the use of coronavirus vaccines, but it should be noted that there were only 33 such cases per million doses of vaccines. However, in one group of subjects (young men under 30) the risk of getting the disease was significantly higher - inflammation of heart tissues occurred 4-5 times more often after using RNA vaccines from Pfizer and Moderna, as opposed to vaccines from other manufacturers.