Fluttering in my chest; Feeling really funny/feel different/felt a little fluey/feel different/feel different/felt like I was hit by train; Red in the face; Few little patches of rash; 99.9°F/I had a temperature; Nausea feeling; Faltering; This spontaneous case was reported by a consumer and describes the occurrence of CARDIAC FLUTTER (Fluttering in my chest), FEELING ABNORMAL (Feeling really funny/feel different/felt a little fluey/feel different/feel different/felt like I was hit by train), ERYTHEMA (Red in the face), ASTHENIA (Faltering) and RASH (Few little patches of rash) in a 68-year-old female patient who received mRNA-1273 (Moderna COVID-19 Vaccine) (batch nos. 939904, 012M20A and 011A21A) for COVID-19 vaccination. The occurrence of additional non-serious events is detailed below.     No Medical History information was reported.   On 08-Feb-2021, the patient received first dose of mRNA-1273 (Moderna COVID-19 Vaccine) (Intramuscular) 1 dosage form. On 08-Mar-2021, received second dose of mRNA-1273 (Moderna COVID-19 Vaccine) (unknown route) dosage was changed to 1 dosage form. On 26-Oct-2021, received third dose of mRNA-1273 (Moderna COVID-19 Vaccine) (unknown route) dosage was changed to 1 dosage form. In October 2021, the patient experienced ASTHENIA (Faltering) and NAUSEA (Nausea feeling). On 27-Oct-2021, the patient experienced CARDIAC FLUTTER (Fluttering in my chest), FEELING ABNORMAL (Feeling really funny/feel different/felt a little fluey/feel different/feel different/felt like I was hit by train), ERYTHEMA (Red in the face) and PYREXIA (99.9°F/I had a temperature). 27-Oct-2021, the patient experienced RASH (Few little patches of rash). At the time of the report, CARDIAC FLUTTER (Fluttering in my chest), FEELING ABNORMAL (Feeling really funny/feel different/felt a little fluey/feel different/feel different/felt like I was hit by train), ERYTHEMA (Red in the face), ASTHENIA (Faltering), RASH (Few little patches of rash), PYREXIA (99.9°F/I had a temperature) and NAUSEA (Nausea feeling) outcome was unknown.      DIAGNOSTIC RESULTS (normal ranges are provided in parenthesis if available): On an unknown date, Blood pressure measurement: 169/90 (High) 169/90 blood pressure. On an unknown date, Body temperature: 99.9 (High) 99.9°F.         Patient did not have symptoms after 1st  and 2nd doses. Patient did not had history of COVID-19 or myocarditis/pericarditis. No concomitant medication were provided. No treatment information were provided.  Company Comment This case concerns a 68-year-old, female patient with no relevant medical history reported, who experienced the unexpected event of cardiac flutter. The event occurred the same day after the third dose of mRNA-1273 Moderna vaccine. The rechallenge was not applicable since the events happened after the third dose. The benefit-risk relationship of mRNA-1273 Moderna vaccine in not affected by this report. The event was downgrade to non-serious due the patient did not seek medical attention and there is no information in the supporting that the event was medically significant.; Sender's Comments: This case concerns a 68-year-old, female patient with no relevant medical history reported, who experienced the unexpected event of cardiac flutter. The event occurred the same day after the third dose of mRNA-1273 Moderna vaccine. The rechallenge was not applicable since the events happened after the third dose. The benefit-risk relationship of mRNA-1273 Moderna vaccine in not affected by this report. The event was downgrade to non-serious due the patient did not seek medical attention and there is no information in the  supporting that the event was medically significant.