AFIB; chest pain; he couldn't see the road; He's sluggish; chest discomfort; fogginess in head; he sleeps a lot; fogginess in head; Headache; chest discomfort; high blood pressure; This spontaneous case was reported by a consumer (subsequently medically confirmed) and describes the occurrence of CHEST PAIN (chest pain) and ATRIAL FIBRILLATION (AFIB) in a 67-year-old male patient who received mRNA-1273 (Moderna COVID-19 Vaccine) (batch nos. 025J20A and 012M20A) for COVID-19 vaccination. The occurrence of additional non-serious events is detailed below.     The patient's past medical history included COPD.   On 07-Jan-2021, the patient received first dose of mRNA-1273 (Moderna COVID-19 Vaccine) (Intramuscular) 1 dosage form. On 02-Feb-2021, received second dose of mRNA-1273 (Moderna COVID-19 Vaccine) (Intramuscular) dosage was changed to 1 dosage form. On 16-Feb-2021, the patient experienced CHEST PAIN (chest pain) (seriousness criterion hospitalization), BLOOD PRESSURE INCREASED (high blood pressure), the first episode of CHEST DISCOMFORT (chest discomfort), the first episode of FEELING ABNORMAL (fogginess in head) and HEADACHE (Headache). On 14-May-2021, the patient experienced ATRIAL FIBRILLATION (AFIB) (seriousness criteria hospitalization and medically significant) and SOMNOLENCE (he sleeps a lot). On 24-May-2021, the patient experienced the second episode of CHEST DISCOMFORT (chest discomfort) and the second episode of FEELING ABNORMAL (fogginess in head). On 25-May-2021, the patient experienced VISUAL IMPAIRMENT (he couldn't see the road) and SLUGGISHNESS (He's sluggish). The patient was hospitalized from 05-Apr-2021 to 06-Apr-2021 due to ATRIAL FIBRILLATION and CHEST PAIN. At the time of the report, CHEST PAIN (chest pain), ATRIAL FIBRILLATION (AFIB), BLOOD PRESSURE INCREASED (high blood pressure), VISUAL IMPAIRMENT (he couldn't see the road), SLUGGISHNESS (He's sluggish), SOMNOLENCE (he sleeps a lot), the last episode of CHEST DISCOMFORT (chest discomfort), the last episode of FEELING ABNORMAL (fogginess in head) and HEADACHE (Headache) outcome was unknown. Unknown          On 03-Mar-2021, Blood pressure measurement result was unknown. On 09-Mar-2021, patient had head scan and coronary test and results were unknown. On 05-Apr-2021, patient had Electrocardiogram and X-ray tests and results were unknown. On 19-Apr-2021, lab work result was unknown. On 27-apr-2021 patient wore heart monitor for two days.  On 28-Apr-2021, Angiogram result was unknown .On 25-May-2021, Electrocardiogram result was unknown. No concomitant medications were reported.  No treatment information was provided. Patient was in the emeragncy two times and hospitalized one time.  Based on current available information and the temporal association between product use and the start date of the events a causal relationship cannot be excluded.       Most recent FOLLOW-UP information incorporated above includes: On 25-May-2021: follow-up was received on 25-may-2021 contains new laboratory data and new event.; Sender's Comments: Based on current available information and the temporal association between product use and the start date of the events a causal relationship cannot be excluded.