myocarditis; pericarditis; almost passing out,going to faint; anxiety; dizziness,Felt dizzy; racing heartbeat,  heart is pounding out of her chest; mostly difficulty breathing; weakness; This spontaneous case was reported by a consumer and describes the occurrence of MYOCARDITIS (myocarditis) and PERICARDITIS (pericarditis) in a 64-year-old female patient who received mRNA-1273 (Moderna COVID-19 Vaccine) (batch nos. 058H21A, 030B21A and 025A21A) for COVID-19 vaccination. The occurrence of additional non-serious events is detailed below.     No Medical History information was reported.   On 19-Mar-2021, the patient received first dose of mRNA-1273 (Moderna COVID-19 Vaccine) (unknown route) 1 dosage form. On 16-Apr-2021, received second dose of mRNA-1273 (Moderna COVID-19 Vaccine) (unknown route) dosage was changed to 1 dosage form. On 03-Dec-2021, received third dose of mRNA-1273 (Moderna COVID-19 Vaccine) (unknown route) dosage was changed to 1 dosage form. In December 2021, the patient experienced PALPITATIONS (racing heartbeat,  heart is pounding out of her chest), DYSPNOEA (mostly difficulty breathing), ASTHENIA (weakness) and DIZZINESS (dizziness,Felt dizzy). On an unknown date, the patient experienced MYOCARDITIS (myocarditis) (seriousness criterion medically significant), PERICARDITIS (pericarditis) (seriousness criterion medically significant), PRESYNCOPE (almost passing out,going to faint) and ANXIETY (anxiety). At the time of the report, MYOCARDITIS (myocarditis), PERICARDITIS (pericarditis) and ANXIETY (anxiety) outcome was unknown and PRESYNCOPE (almost passing out,going to faint), PALPITATIONS (racing heartbeat,  heart is pounding out of her chest), DYSPNOEA (mostly difficulty breathing), ASTHENIA (weakness) and DIZZINESS (dizziness,Felt dizzy) had not resolved.      DIAGNOSTIC RESULTS (normal ranges are provided in parenthesis if available): On an unknown date, Heart rate: 124 (High) 124.     For mRNA-1273 (Moderna COVID-19 Vaccine) (Unknown), the reporter did not provide any causality assessments.   Concomitant medications were not provided. After the booster dose Shortly after that, within three days the patient experienced adverse effects of difficulty breathing, racing heartbeat, dizziness, weakness, shortnessof breath, and pounding heart palpitations.  Patient went to the emergency room on 06 Dec 2021and took some tests couldn't find anything wrong. On 10Jan2022, morning the patient felt dizzy, like she is going to faint and  Her heart was pounding out of her chest. Patient was experiencing like every day the last month. Patient had 124 heart beat with no exercise. Patient states myocarditis and pericarditis have been reported. Those are part of the symptoms that she's having. Patient had no history of COVID-19. Treatment medication was not provided.  Company comment: This case concerns a 64-year-old, female patient with no medical history, who experienced the expected serious events of myocarditis and pericarditis along with other non serious events. The events occurred in the same month after the third dose of mRNA-1273. As reported, within three days the patient experienced adverse effects of difficulty breathing, racing heartbeat, dizziness, weakness, shortness of breath, and pounding heart palpitations.  Patient went to the emergency room on 06 Dec 2021and took some tests couldn't find anything wrong. Approximately 1 month after third dose the patient felt dizzy, like she is going to faint and her heart was pounding out of her chest. Patient was experiencing like every day the last month. Patient had 124 heart beat with no exercise. Patient states myocarditis and pericarditis have been reported. Those are part of the symptoms that she's having. The benefit-risk relationship of mRNA-1273 is not affected by this report.; Sender's Comments: This case concerns a 64-year-old, female patient with no medical history, who experienced the expected serious events of myocarditis and pericarditis along with other non serious events. The events occurred in the same month after the third dose of mRNA-1273. As reported, within three days the patient experienced adverse effects of difficulty breathing, racing heartbeat, dizziness, weakness, shortness of breath, and pounding heart palpitations.  Patient went to the emergency room on 06 Dec 2021and took some tests couldn't find anything wrong. Approximately 1 month after third dose the patient felt dizzy, like she is going to faint and her heart was pounding out of her chest. Patient was experiencing like every day the last month. Patient had 124 heart beat with no exercise. Patient states myocarditis and pericarditis have been reported. Those are part of the symptoms that she's having. The benefit-risk relationship of mRNA-1273 is not affected by this report.