What is the occasional chest tightness?

First of all, it is necessary to make clear whether the child has cold symptoms recently. If there is a history of cold, it may not be caused by viral myocarditis. It may also be caused by myocardial ischemia caused by insufficient sleep of the child. It may also be caused by paroxysmal tachycardia. It is suggested that parents can take the child to check ECG and echocardiography to clarify the cause.