Not being able to pitch all year doesn't make it a life threatening illness for him. He will be fine, and statistically it's overwhelmingly likely that all the NFL players mentioned will be, too.
I am sorry, where did your cardiology training come from? I missed that. Myocarditis is a severe and life threatening illness.
Beyond that, numerous young and healthy people are experiencing long term lung issues.
Here is what some actual heart experts have to say.
www.mayoclinic.org
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And I'll pull out the most important portion:
Complications
Severe myocarditis can permanently damage your heart muscle, possibly causing:
- Heart failure. Untreated, myocarditis can damage your heart's muscle so that it can't pump blood effectively. In severe cases, myocarditis-related heart failure may require a ventricular assist device or a heart transplant.
- Heart attack or stroke. If your heart's muscle is injured and can't pump blood, the blood that pools in your heart can form clots. If a clot blocks one of your heart's arteries, you can have a heart attack. If a blood clot in your heart travels to an artery leading to your brain before becoming lodged, you can have a stroke.
- Rapid or abnormal heart rhythms (arrhythmias). Damage to your heart muscle can cause arrhythmias.
- Sudden cardiac death. Certain serious arrhythmias can cause your heart to stop beating (sudden cardiac arrest). It's fatal if not treated immediately.