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CDC and its partners are actively monitoring reports of myocarditis and pericarditis after COVID-19 vaccination. Active monitoring includes reviewing data and medical records and evaluating the relationship to COVID-19 vaccination.
Information about CDC’s ongoing study of myocarditis after COVID-19 vaccination can be found here: Investigating Long-Term Effects of Myocarditis | CDC
Myocarditis is inflammation of the heart muscle.
Pericarditis is inflammation of the outer lining of the heart.
- In both cases, the body’s immune system causes inflammation in response to an infection or some other trigger. Learn more about myocarditis and pericarditis. Both myocarditis and pericarditis have the following symptoms:
- Chest pain
- Shortness of breath
- Feelings of having a fast-beating, fluttering, or pounding heart
Myocarditis and pericarditis have rarely been reported. When reported, the cases have especially been in adolescents and young adult males within several days after mRNA COVID-19 vaccination (Pfizer-BioNTech or Moderna).
- More often after the second dose
- Usually within a week of vaccination
- Most patients with myocarditis or pericarditis who received care responded well to medicine and rest and felt better quickly.
- Patients can usually return to their normal daily activities after their symptoms improve.
- Those who have been diagnosed with myocarditis should consult with their cardiologist (heart doctor) about return to exercise or sports.