weird chest pain; heart was racing; blood pressure was crazy high; slept a lot; super tired; he had Myocarditis; This spontaneous case was reported by a consumer and describes the occurrence of MYOCARDITIS (he had Myocarditis) in a 35-year-old male patient who received mRNA-1273 (Moderna COVID-19 Vaccine) (batch nos. 025J20-2A and 030L20A) for COVID-19 vaccination. The occurrence of additional non-serious events is detailed below.     No Medical History information was reported.   On 22-Dec-2020, the patient received first dose of mRNA-1273 (Moderna COVID-19 Vaccine) (Intramuscular) 1 dosage form. On 19-Jan-2021, received second dose of mRNA-1273 (Moderna COVID-19 Vaccine) (unknown route) dosage was changed to 1 dosage form. In December 2020, the patient experienced MYOCARDITIS (he had Myocarditis) (seriousness criterion medically significant). On 21-Dec-2020, the patient experienced HYPERSOMNIA (slept a lot) and FATIGUE (super tired). On 27-Dec-2020, the patient experienced CHEST PAIN (weird chest pain), PALPITATIONS (heart was racing) and HYPERTENSION (blood pressure was crazy high). On 22-Dec-2020, HYPERSOMNIA (slept a lot) and FATIGUE (super tired) outcome was unknown. At the time of the report, MYOCARDITIS (he had Myocarditis), CHEST PAIN (weird chest pain), PALPITATIONS (heart was racing) and HYPERTENSION (blood pressure was crazy high) outcome was unknown.      DIAGNOSTIC RESULTS (normal ranges are provided in parenthesis if available): In December 2020, Blood pressure measurement: 135-138 (Inconclusive) blood pressure was crazy high for him( 135 to 138 ) no medications.     mRNA-1273 (Moderna COVID-19 Vaccine) (Unknown) and mRNA-1273 (Moderna COVID-19 Vaccine) (Intramuscular) dosing remained unchanged.       Patient heart was racing so he tried breathing exercises but it continued to end of March. While this was happeing had weird chest pain feeling.  Patient felt very bad On a scale of 1 to 10 was a 9/10 the first 3 weeks. Then went to 7 for a month, then to 6 in may. 4/3 for July to June and now at about a 2.  No cardiac test was done. 1st 2nd week January labs came back normal. Did not have heart test done and labs came back normal.patient Had no symptom like this before vaccine and no treatment was given no history of COVID 19 infection or Myocarditis/pericarditis.  No concomitant and treatment information was provided.  It has been reported that symptoms started a week or so after first dose.  Rechallenge was unknown.   Company Comment: This case concerns a 35-year-old male patient, with no reported relevant medical history, who experienced the serious expected AESI of Myocarditis .The event occurred on unknown date after receiving first dose of Spikevax. The rechallenge was unknown for the event, as there is only information available about the first dose. The benefit-risk relationship is not affected by this report.; Sender's Comments: This case concerns a 35-year-old male patient, with no reported relevant medical history, who experienced the serious expected AESI of Myocarditis .The event occurred on unknown date after receiving first dose of Spikevax. The rechallenge was unknown for the event, as there is only information available about the first dose. The benefit-risk relationship is not affected by this report.