extremely weak; tired; blacked out again; heart rhythm was out of whack; could not speak and was mumbling like a stroke event/could not respond/stroke; heart attack; diabetic comma for 3 days; pulmonary embolism; was found on the floor unconscious/blacked out; multiple occurrences of seizures; loosing weigh rapidly; electrolyte imbalance; trouble swallowing; This spontaneous case was reported by a consumer and describes the occurrence of CEREBROVASCULAR ACCIDENT (could not speak and was mumbling like a stroke event/could not respond/stroke), MYOCARDIAL INFARCTION (heart attack), DIABETIC COMA (diabetic comma for 3 days), PULMONARY EMBOLISM (pulmonary embolism), LOSS OF CONSCIOUSNESS (was found on the floor unconscious/blacked out), SEIZURE (multiple occurrences of seizures), WEIGHT DECREASED (loosing weigh rapidly), DYSPHAGIA (trouble swallowing), ASTHENIA (extremely weak), FATIGUE (tired), LOSS OF CONSCIOUSNESS (blacked out again) and ARRHYTHMIA (heart rhythm was out of whack) in a 66-year-old female patient who received mRNA-1273 (Moderna COVID-19 Vaccine) (batch nos. 045B21 and 031B21A) for COVID-19 vaccination. The occurrence of additional non-serious events is detailed below.     Concurrent medical conditions included Diabetic and Low blood pressure. Concomitant products included OMEPRAZOLE MAGNESIUM (PRILOSEC [OMEPRAZOLE MAGNESIUM]), FUROSEMIDE, POTASSIUM CHLORIDE (LASIX + K), LEVOTHYROXINE, ATORVASTATIN CALCIUM (LIPITOR), LEVOTHYROXINE SODIUM (SYNTHROID) and OXYBUTYNIN HYDROCHLORIDE (DITROPAN) for an unknown indication.   On 05-Apr-2021, the patient received first dose of mRNA-1273 (Moderna COVID-19 Vaccine) (unknown route) 1 dosage form. On 03-May-2021, received second dose of mRNA-1273 (Moderna COVID-19 Vaccine) (unknown route) dosage was changed to 1 dosage form. On an unknown date, the patient experienced CEREBROVASCULAR ACCIDENT (could not speak and was mumbling like a stroke event/could not respond/stroke) (seriousness criteria medically significant and life threatening), MYOCARDIAL INFARCTION (heart attack) (seriousness criteria medically significant and life threatening), DIABETIC COMA (diabetic comma for 3 days) (seriousness criteria medically significant and life threatening), PULMONARY EMBOLISM (pulmonary embolism) (seriousness criteria medically significant and life threatening), LOSS OF CONSCIOUSNESS (was found on the floor unconscious/blacked out) (seriousness criteria hospitalization prolonged and medically significant), SEIZURE (multiple occurrences of seizures) (seriousness criteria hospitalization prolonged and medically significant), WEIGHT DECREASED (loosing weigh rapidly) (seriousness criterion life threatening), ELECTROLYTE IMBALANCE (electrolyte imbalance), DYSPHAGIA (trouble swallowing) (seriousness criterion hospitalization prolonged), ASTHENIA (extremely weak) (seriousness criterion hospitalization), FATIGUE (tired) (seriousness criterion hospitalization), LOSS OF CONSCIOUSNESS (blacked out again) (seriousness criteria hospitalization and medically significant) and ARRHYTHMIA (heart rhythm was out of whack) (seriousness criteria hospitalization and medically significant). At the time of the report, CEREBROVASCULAR ACCIDENT (could not speak and was mumbling like a stroke event/could not respond/stroke), PULMONARY EMBOLISM (pulmonary embolism), LOSS OF CONSCIOUSNESS (was found on the floor unconscious/blacked out), SEIZURE (multiple occurrences of seizures), WEIGHT DECREASED (loosing weigh rapidly), ELECTROLYTE IMBALANCE (electrolyte imbalance), DYSPHAGIA (trouble swallowing), ASTHENIA (extremely weak), FATIGUE (tired), LOSS OF CONSCIOUSNESS (blacked out again) and ARRHYTHMIA (heart rhythm was out of whack) outcome was unknown and MYOCARDIAL INFARCTION (heart attack) and DIABETIC COMA (diabetic comma for 3 days) had resolved.      DIAGNOSTIC RESULTS (normal ranges are provided in parenthesis if available): On an unknown date, Blood magnesium: low (Low) Low. On an unknown date, Blood potassium: low (Low) Low.         Patient was still in the hospital.  Patient was given all kinds of medication to treat symptoms.  Patient was diagnosed with seizure, electrolyte imbalance, potassium and magnesium extremely low, pulmonary embolism and  a blood clot in the right lung.  Very limited information regarding these events have been provided at this time. Patient's other medical conditions such as diabetes and low blood pressure might be confounding factors to the events. No further information is expected as there are no reporter contact details.; Sender's Comments: Very limited information regarding these events have been provided at this time. Patient's other medical conditions such as diabetes and low blood pressure might be confounding factors to the events. No further information is expected as there are no reporter contact details.