If children have fever and myocarditis, they will show the following clinical symptoms: 1. Firstly, they will show chest tightness and panic. If the age belongs to the school-age children, this time children will have subjective feeling, children will have chest tightness, panic, and even chest pain and other symptoms.2, second, manifested as a decline in the amount of activity. Children at a young age have poor subjective expression, which is mainly manifested by a significantly low amount of activity and lack of spirit.3. Once again,, you can look at the child’s complexion. If the child’s cardiomyopathy is very pronounced, the face will appear pale or even gray. Finally, the child’s heart can be auscultated. Myocarditis can cause a marked increase in heart rate and a dull heart sound. If there is a suspicion of myocarditis in a febrile child, it is necessary to perform a cardiac ultrasound, an electrocardiogram, and a myocardial enzyme profile.