hot; heart rate was high felt like she was going to have cardiac arrest; felt suddenly weaken,still feel weak; dizziness,felt fainting,felt dizzy while sitting down,still feel dizzy; now have high blood pressure; Pain in her chest area which is manageable; vertigo; constant headache; This spontaneous case was reported by a consumer and describes the occurrence of ASTHENIA (felt suddenly weaken,still feel weak), DIZZINESS (dizziness,felt fainting,felt dizzy while sitting down,still feel dizzy), HYPERTENSION (now have high blood pressure), FEELING HOT (hot) and FEELING ABNORMAL (heart rate was high felt like she was going to have cardiac arrest) in a 61-year-old female patient who received mRNA-1273 (Moderna COVID-19 Vaccine) (batch nos. 013F21A and 037F21A) for COVID-19 vaccination. The occurrence of additional non-serious events is detailed below.     No Medical History information was reported.   On 21-Oct-2021, the patient received first dose of mRNA-1273 (Moderna COVID-19 Vaccine) (Intramuscular) 1 dosage form. On 18-Nov-2021, received second dose of mRNA-1273 (Moderna COVID-19 Vaccine) (Intramuscular) dosage was changed to 1 dosage form. In 2021, the patient experienced HYPERTENSION (now have high blood pressure) (seriousness criterion hospitalization), CHEST PAIN (Pain in her chest area which is manageable), VERTIGO (vertigo) and HEADACHE (constant headache). On 18-Nov-2021,  after starting mRNA-1273 (Moderna COVID-19 Vaccine), the patient experienced ASTHENIA (felt suddenly weaken,still feel weak) (seriousness criterion hospitalization), DIZZINESS (dizziness,felt fainting,felt dizzy while sitting down,still feel dizzy) (seriousness criterion hospitalization), FEELING HOT (hot) (seriousness criterion hospitalization) and FEELING ABNORMAL (heart rate was high felt like she was going to have cardiac arrest) (seriousness criterion hospitalization). The patient was hospitalized on 18-Nov-2021 due to ASTHENIA, DIZZINESS, FEELING ABNORMAL and FEELING HOT. The patient was treated with NAPROXEN at an unspecified dose and frequency and MECLIZINE [MECLOZINE] for Dizziness, at a dose of 25 mg. At the time of the report, ASTHENIA (felt suddenly weaken,still feel weak), DIZZINESS (dizziness,felt fainting,felt dizzy while sitting down,still feel dizzy), HYPERTENSION (now have high blood pressure), CHEST PAIN (Pain in her chest area which is manageable), VERTIGO (vertigo) and HEADACHE (constant headache) had not resolved and FEELING HOT (hot) and FEELING ABNORMAL (heart rate was high felt like she was going to have cardiac arrest) outcome was unknown.      DIAGNOSTIC RESULTS (normal ranges are provided in parenthesis if available): On 18-Nov-2021, Blood glucose: normal (normal) blood glucose level was normal. On 18-Nov-2021, Blood pressure measurement: high (High) blood pressure was high/ tried getting her blood pressure but they could not.. On 18-Nov-2021, Electrocardiogram: normal (normal) result came back okay. On 18-Nov-2021, Heart rate: 138 (High) heart rate was 138/ heart rate was high. On 18-Nov-2021, Myocardial necrosis marker: normal (normal) result came back okay.         Concomitant drugs were not reported. Patient stated that after sitting for 20-30 minutes as it was recommended by the facility. Patient stated that while leaving the facility they felt suddenly weaken, dizziness, hot, felt fainting. The facility sat her down, tried getting her blood pressure but they could not. The facility then rushed her to ER. In the ER, patient stated their heart rate was 138, felt dizzy while sitting down, their blood glucose level was normal, blood pressure was high, and her heart rate was high felt like she was going to have cardiac arrest. Patient stated in the ER they received 2 bags of fluid to hydrate them. Patient was stated in the ER they performed EKG and Cardiac Enzyme and the result came back okay and was told see Cardiologist and see their Primary Physician. The Primary Physician refilled Naproxen and gave Meclizine 25 mg for the dizziness. Patient states that currently she is feeling weak, dizziness, vertigo, and constant headache. Pain in their chest area which is manageable and now have high blood pressure. Patient stated that they are scheduled to see Cardiologist on 27-Dec-2021. Patient had no history of COVID-19 infection and Myocarditis/pericarditis  Company Comment:This is a spontaneous case concerning a 61-year-old, female patient with no reported medical history, who experienced the unexpected serious events of Asthenia, Dizziness, Hypertension, Feeling hot, Feeling abnormal, Chest pain, Vertigo and Headache. The events occurred on the same day after the second dose of mRNA-1273 vaccine. Patient was rushed to ER where her heart rate was 138 and felt dizzy while sitting down, blood glucose level was normal, blood pressure was high. Patient stated that she received 2 bags of fluid to hydrate her, and they performed EKG and Cardiac Enzyme both are normal. Naproxen and Meclizine are used as treatment. The benefit-risk relationship of mRNA-1273 vaccine is not affected by this report.   This case was linked to MOD-2021-413634 (Patient Link).; Sender's Comments: This is a spontaneous case concerning a 61-year-old, female patient with no reported medical history, who experienced the unexpected serious events of Asthenia, Dizziness, Hypertension, Feeling hot, Feeling abnormal, Chest pain, Vertigo and Headache. The events occurred on the same day after the second dose of mRNA-1273 vaccine. Patient was rushed to ER where her heart rate was 138 and felt dizzy while sitting down, blood glucose level was normal, blood pressure was high. Patient stated that she received 2 bags of fluid to hydrate her, and they performed EKG and Cardiac Enzyme both are normal. Naproxen and Meclizine are used as treatment. The benefit-risk relationship of mRNA-1273 vaccine is not affected by this report.