Using myself as example, I took the first shot of Novavax vaccine awhile ago. 6 days after the shot, I had tightness in my chest for two days. It was unlikely to be heart burn since I rarely rarely get it and never last for days. Now the FDA noted the Novavax can cause myocarditis. I haven’t heard much negative about Chinese inactivated vaccines.
I had the same exact experience with Pfizer. 7 days after my 2nd shot of Pfizer mRNA, I had tightness in my chest, fatigue, and dizziness for few days, I've never experienced that before... Few weeks later, I read an article from FDA saying there is a chance mRNA can cause myocarditis/pericarditis, so I immediately went to emergency room to get tested, but the D-dimer and troponin levels indicated no myocarditis/pericarditis. Instead, these doctors say it: 1) esophageal spasm, 2) acid reflux, 3) heartburn, which is bullshit. I am 100% sure it was vaccine-related, so I reported my symptoms to CDC's VAERS, and I spoke with a gastroenterologist, who said it's highly unlikely to be acid reflux or esophageal spasm. So it is 100% vaccine-related.
Just yesterday, a claims-analysis published in the Lancet reported the risk was highest among young men 18-25 with 1.7 per 100,000 person-years of myocarditis/pericarditis with Pfizer mRNA after their 2nd dose. (Source:
) I'm basically in early 30's so somewhat in that cohort, but the older you are, the less likely of developing myocarditis post-mRNA vaccine.
BUT... with that said, I still got my 3rd booster shot (no side-effects), because I know the risk of myocarditis/pericarditis is even higher from COVID infection than from mRNA vaccines itself. According to
, the excess risk of myocarditis with mRNA is 1-6 extra cases per 1 million, compared to 40 extra cases per 1 million after COVID infection. In other words, if I got COVID, the risk of myocarditis is higher than from vaccination itself. So I'd rather take my chances with the vaccine than with COVID itself.
