Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Myocarditis ?
    ### Response:
    Myocarditis is a condition that is characterized by inflammation of the heart muscle (myocardium). Some affected people have no noticeable symptoms of the condition. When present, signs and symptoms may include chest pain, abnormal heartbeat, shortness of breath, fatigue, signs of infection (i.
    