abdominal pain; Vacillating pulse; High blood pressure of 186/110 mmHg/They took him to the ER where his blood pressure got regulated; felt a little funny; This spontaneous case was reported by a consumer and describes the occurrence of ABDOMINAL PAIN (abdominal pain) and PULSE ABNORMAL (Vacillating pulse) in an 81-year-old male patient who received mRNA-1273 (Moderna COVID-19 Vaccine) (batch nos. 046L21A, 017B21A and 013A21A) for COVID-19 vaccination. The occurrence of additional non-serious events is detailed below.     Patient had no allergies, acute and chronic illnesses at the time of vaccination.    On 04-Mar-2021, the patient received first dose of mRNA-1273 (Moderna COVID-19 Vaccine) (unknown route) 1 dosage form. On 01-Apr-2021, received second dose of mRNA-1273 (Moderna COVID-19 Vaccine) (unknown route) dosage was changed to 1 dosage form. On 26-Mar-2022, received third dose of mRNA-1273 (Moderna COVID-19 Vaccine) (unknown route) dosage was changed to 1 dosage form. On 31-Mar-2022, the patient experienced ABDOMINAL PAIN (abdominal pain) (seriousness criterion hospitalization), PULSE ABNORMAL (Vacillating pulse) (seriousness criterion hospitalization), HYPERTENSION (High blood pressure of 186/110 mmHg/They took him to the ER where his blood pressure got regulated) and FEELING ABNORMAL (felt a little funny). At the time of the report, ABDOMINAL PAIN (abdominal pain), PULSE ABNORMAL (Vacillating pulse) and FEELING ABNORMAL (felt a little funny) had not resolved and HYPERTENSION (High blood pressure of 186/110 mmHg/They took him to the ER where his blood pressure got regulated) was resolving.      DIAGNOSTIC RESULTS (normal ranges are provided in parenthesis if available): On 31-Mar-2022, Blood pressure measurement: 186/110 (High) 186/110 mmHg. On 31-Mar-2022, Heart rate: 195 (High) 195 bpm and 44 (Low) pulse dropped to 44 bpm.         Concomitant product provided as high blood pressure medicine.  No treatment medication was provided.  Company Comment: This is a spontaneous case concerning an 81-year-old male patient with no reported medical history, who experienced the unexpected serious events of Abdominal Pain and Pulse Abnormal. The events led to the hospitalization of the patient and occurred 5 days after receiving the booster dose of mRNA-1273 Vaccine. As reported, 5 days after receiving the booster dose, patient felt a little funny and noticed elevated blood pressure and pulse, he was then rushed to the emergency room where blood pressure was controlled however his pulse dropped below normal range and had abdominal pain hence patient was put on observation. Rechallenge was not applicable since the events of high blood pressure, high pulse, and abdominal pain occurred on the second dose, the outcome was unknown. The benefit-risk relationship of mRNA-1273 Vaccine is not affected by this report.   This case was linked to MOD-2022-530116, MOD-2022-530147.; Sender's Comments: This is a spontaneous case concerning an 81-year-old male patient with no reported medical history, who experienced the unexpected serious events of Abdominal Pain and Pulse Abnormal. The events led to the hospitalization of the patient and occurred 5 days after receiving the booster dose of mRNA-1273 Vaccine. As reported, 5 days after receiving the booster dose, patient felt a little funny and noticed elevated blood pressure and pulse, he was then rushed to the emergency room where blood pressure was controlled however his pulse dropped below normal range and had abdominal pain hence patient was put on observation. Rechallenge was not applicable since the events of high blood pressure, high pulse, and abdominal pain occurred on the second dose, the outcome was unknown. The benefit-risk relationship of mRNA-1273 Vaccine is not affected by this report.