myocarditis; pericarditis; Moderna vaccine floored him; ruined my quality of life; run out of breath; stomach discomfort a few days; He had a shoulder thing; sick for 2 months; This spontaneous case was reported by a patient and describes the occurrence of MYOCARDITIS (myocarditis) and PERICARDITIS (pericarditis) in a 51-year-old male patient who received mRNA-1273 (Spikevax) for COVID-19 prophylaxis. The occurrence of additional non-serious events is detailed below.     No Medical History information was reported.    On an unknown date, the patient received first dose of mRNA-1273 (Spikevax) (unknown route) 1 dosage form. On an unknown date, the patient experienced MYOCARDITIS (myocarditis) (seriousness criterion hospitalization), PERICARDITIS (pericarditis) (seriousness criterion hospitalization), IMMUNISATION REACTION (Moderna vaccine floored him), IMPAIRED QUALITY OF LIFE (ruined my quality of life), DYSPNOEA (run out of breath), ABDOMINAL DISCOMFORT (stomach discomfort a few days), MUSCULOSKELETAL DISCOMFORT (He had a shoulder thing) and ILLNESS (sick for 2 months). The patient was treated with IBUPROFEN for Shoulder discomfort, at an unspecified dose and frequency. At the time of the report, MYOCARDITIS (myocarditis), PERICARDITIS (pericarditis), IMMUNISATION REACTION (Moderna vaccine floored him), IMPAIRED QUALITY OF LIFE (ruined my quality of life), DYSPNOEA (run out of breath), ABDOMINAL DISCOMFORT (stomach discomfort a few days) and MUSCULOSKELETAL DISCOMFORT (He had a shoulder thing) outcome was unknown and ILLNESS (sick for 2 months) had resolved.        The action taken with mRNA-1273 (Spikevax) (Unknown) was unknown.       Patient used to run 5 miles away. Patient had been in the ER five times that July. Patient had treatment for myocarditis and pericarditis, but they can't actively helped him now. Concomitant medications were not reported.  Company comment: This spontaneous case concerns a 51 year old male patient with no reported medical history, who experienced the expected, serious (hospitalization) AESI of Myocarditis and Pericarditis , unknown days after receiving the first dose of mRNA-1273 vaccine. The patient had an active lifestyle and he used to run 5 miles. The patient reported that after the first dose, he had stomach discomfort for a few days. He also had shoulder discomfort for which he took ibuprofen per the nurse. On an unknown date after the vaccine, he was admitted to the ICU and treated for Myocarditis and Pericarditis. He was reportedly sick for 2 months and was in and out of the ER about five times. No information on risk factors, co morbidities, detailed clinical course, relevant investigations, treatment, outcome of the events was available in the report. The benefit-risk relationship of mRNA-1273 is not affected by this report.; Sender's Comments: This spontaneous case concerns a 51 year old male patient with no reported medical history, who experienced the expected, serious (hospitalization) AESI of Myocarditis and Pericarditis , unknown days after receiving the first dose of mRNA-1273 vaccine. The patient had an active lifestyle and he used to run 5 miles. The patient reported that after the first dose, he had stomach discomfort for a few days. He also had shoulder discomfort for which he took ibuprofen per the nurse. On an unknown date after the vaccine, he was admitted to the ICU and treated for Myocarditis and Pericarditis. He was reportedly sick for 2 months and was in and out of the ER about five times. No information on risk factors, co morbidities, detailed clinical course, relevant investigations, treatment, outcome of the events was available in the report. The benefit-risk relationship of mRNA-1273 is not affected by this report.