Inclusion Criteria:  Patients age >= 12 years of age,  Developed a new symptom of suspected myocarditis/pericarditis within 42 days of receiving a COVID-19 vaccination. The clinical symptoms include chest pain, pressure, or discomfort; dyspnea, shortness of breath, or pain with breathing; palpitations; or syncope.  OR Developed two new non-specific symptoms in patients 12-18 years of age within 42 days of receiving a COVID-19 vaccination. These symptoms include irritability, vomiting, poor feeding, tachypnea, or lethargy.  At least one of the following:  ECG abnormalities Elevations in any type of troponin (above threshold of normal) MRI evidence of abnormal T1 or T2 values compatible with myocarditis, as recommended by the updated Lake Louise criteria, or pericarditis, or pericardial effusion Any new or worsening cardiac arrhythmias on ECG or telemetry or Holter monitor Echocardiographic findings of abnormal cardiac function, new wall motion abnormality, or pericardial effusion Pericardial friction rub on physical exam  Exclusion Criteria:  1. Clear alternative diagnosis or explanation for the symptoms and findings such as active COVID-19 infection.