Nearly fainted twice on the bathroom floor; Postural hypotension; Left lower quadrant abdominal pain which continued for 24 hours; Dumping water from her rectum for approximately 24 hours; swelling of the lymph nodes on right side that increased to the size of a foot ball; Unable to move arm due to swelling in the lymph nodes; stabbing pains in chest that lasted from one to five minutes/pains on left lateral/Pain in chest wall and into heck on the lymph track; Throat was swelling with irregular heart beats; full compensatory pause when the patient was listening to heartbeat with her stethoscope; This spontaneous case was reported by a nurse (subsequently medically confirmed) and describes the occurrence of SYNCOPE (Nearly fainted twice on the bathroom floor) and ARRHYTHMIA (full compensatory pause when the patient was listening to heartbeat with her stethoscope) in a 60-year-old female patient who received mRNA-1273 (Moderna COVID-19 Vaccine) (batch no. 040A21A) for COVID-19 vaccination. The occurrence of additional non-serious events is detailed below.     The patient's past medical history included No adverse event.    On 31-Mar-2021, the patient received second dose of mRNA-1273 (Moderna COVID-19 Vaccine) (unknown route) 1 dosage form. On 31-Mar-2021, the patient experienced ARRHYTHMIA (full compensatory pause when the patient was listening to heartbeat with her stethoscope) (seriousness criterion medically significant), CHEST PAIN (stabbing pains in chest that lasted from one to five minutes/pains on left lateral/Pain in chest wall and into heck on the lymph track) and PHARYNGEAL SWELLING (Throat was swelling with irregular heart beats). On 01-Apr-2021, the patient experienced LYMPHADENOPATHY (swelling of the lymph nodes on right side that increased to the size of a foot ball) and HYPOKINESIA (Unable to move arm due to swelling in the lymph nodes). On 04-Apr-2021, the patient experienced ORTHOSTATIC HYPOTENSION (Postural hypotension), ABDOMINAL PAIN (Left lower quadrant abdominal pain which continued for 24 hours) and DIARRHOEA (Dumping water from her rectum for approximately 24 hours). On 05-Apr-2021, the patient experienced SYNCOPE (Nearly fainted twice on the bathroom floor) (seriousness criterion medically significant). At the time of the report, SYNCOPE (Nearly fainted twice on the bathroom floor), ARRHYTHMIA (full compensatory pause when the patient was listening to heartbeat with her stethoscope), ORTHOSTATIC HYPOTENSION (Postural hypotension), CHEST PAIN (stabbing pains in chest that lasted from one to five minutes/pains on left lateral/Pain in chest wall and into heck on the lymph track), PHARYNGEAL SWELLING (Throat was swelling with irregular heart beats), LYMPHADENOPATHY (swelling of the lymph nodes on right side that increased to the size of a foot ball), HYPOKINESIA (Unable to move arm due to swelling in the lymph nodes), ABDOMINAL PAIN (Left lower quadrant abdominal pain which continued for 24 hours) and DIARRHOEA (Dumping water from her rectum for approximately 24 hours) outcome was unknown.        For mRNA-1273 (Moderna COVID-19 Vaccine) (Unknown), the reporter did not provide any causality assessments.   Treatment was not reported/ unknown.  Based on the current available information and temporal association between the use of the product and the start date of the events, a causal relationship cannot be excluded.  Further information has been requested.; Sender's Comments: Based on the current available information and temporal association between the use of the product and the start date of the events, a causal relationship cannot be excluded.  Further information has been requested.