And in most cases it will heal without any complications or long term effects.
Not sure where you're getting your information from, but heart tissue does not regenerate, similar to brain tissue, once damaged it remains so. Even mild cases of myocarditis are taking potentially years off a persons life, and the 5 year survival rate for severe myocarditis is only around 40%.
You should read up on it: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3370379/ specifically the Clinical symptoms and Prognosis sections. It's a serious, life altering condition.
How do you check for myocarditis?
From that paper I posted
Symptoms: Myocarditis can manifest like a myocardial infarction with sudden-onset angina pectoris, arrhythmias, and/or heart failure developing within days. Most patients with myocarditis initially have such non-specific symptoms that these are often categorized in the context of the preceding infection and not as being of cardiac origin.
Diagnosis: Electrocardiography results and laboratory chemical findings that are characteristic of acute myocarditis—such as the changes to the ST segment and raised cardiac enzymes that are typical for acute myocardial involvement. As the pathophysiological changes of infectious and non-infectious myocarditis occur at a cellular and subcellular level, confirmation of a specific pathogen or inflammation requires a direct examination of myocardial tissue, which can be obtained without problems by means of a biopsy.
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