First of all, myocarditis in general presents with variable and usually vague symptoms. Most commonly patients have tachycardia, which has also been associated with patients on the drug who have no signs of myocarditis. Patients may experience palpitations. In patients whose heart muscle is inflamed, corresponding fatigue that is otherwise unexplained and shortness of breath are also common. Some patients may experience an atypical, hard-to-describe chest pain that could be referred to as dull, constant, or heavy. Fever, usually low grade, is often present, but may be entirely absent.