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Without being applied at massive scale we probably wouldn't even be able to link the two. 13.3 cases of myocarditis per 100,000 (moderna) or 2.7 cases per 100,000 (pfizer) would be very hard to detect if we weren't giving out billions of doses. For perspective, the global before-covid rate of myocarditis was something like 1.5 cases per 100,000.

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Is it possible for cases of myocarditis to go undetected? For instance can people just ignore the symptoms and go without treatment?

Yes, especially in men

I am in no way an expert, but I would guess it can. Wikipedia says:

> Symptoms can include shortness of breath, chest pain, decreased ability to exercise, and an irregular heartbeat.[1] The duration of problems can vary from hours to months.

That's the kind of thing people often ignore. Especially if it only happens once. _Especially_ when getting healthcare is expensive.

Is this something an Apple Watch could detect? Seems like a wearable with diagnostic capabilities is uniquely positioned to detect this at scale at no cost. If you use Apple Health, I believe it may also have access to your digital vaccination record depending on jurisdiction and if you’ve granted Apple access to it (which would allow segmenting by vaccine manufacturer and correlation with heart anomaly detection).

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