What are the symptoms of viral myocarditis?

Heart failure: Shortness of breath, chest pain, shortness of breath on usual or less than usual exertion, sitting up to breath better, waking up short of breath or gasping for air, swelling in the legs and abdomen, skipped or racing beats of the heart.

None, some, many: Depending on the severity of the illness, you may not have any noticeable symptoms if very mild. Some may have chest pain, fever/sweat, chills, and shortness of breath. In severe cases, in addition to above, you may get palpitations, passing out, cardiogenic-shock (heart failure to pump) and death. If you have any concerns/symptoms above, consult doc asap. Good luck.