panic attack; brain fog and high blood pressure have been associated with the vaccination; cold sweat; fever/ low grade fever; 8 hours later experienced muscle pain at the lower back, sciatica like; anxious; This spontaneous case was reported by a patient and describes the occurrence of SCIATICA (8 hours later experienced muscle pain at the lower back, sciatica like), ANXIETY (anxious), PANIC ATTACK (panic attack), BRAIN FOG (brain fog and high blood pressure have been associated with the vaccination) and COLD SWEAT (cold sweat) in a 71-year-old male patient who received mRNA-1273.815 (SPIKEVAX 2023-2024 PFS) (batch no. 3031283) for COVID-19 prophylaxis. The occurrence of additional non-serious events is detailed below.     Previously administered products included for Product used for unknown indication: Pfizer (5th dose) on 10-Oct-2022. Past adverse reactions to the above products included No adverse event with Pfizer. Concurrent medical conditions included Hypertension (on Telmisartan), Anxiety (meds taken before going to bed statin drug) and Depression (meds taken before going to bed statin drug). Concomitant products included TELMISARTAN for Hypertension.    On 01-Oct-2023, the patient received sixth dose of mRNA-1273.815 (SPIKEVAX 2023-2024 PFS) (unknown route) 1 dosage form. On 01-Oct-2023, the patient experienced SCIATICA (8 hours later experienced muscle pain at the lower back, sciatica like) and ANXIETY (anxious). On 03-Oct-2023, the patient experienced COLD SWEAT (cold sweat) and PYREXIA (fever/ low grade fever). On an unknown date, the patient experienced PANIC ATTACK (panic attack) and BRAIN FOG (brain fog and high blood pressure have been associated with the vaccination). On 03-Oct-2023, COLD SWEAT (cold sweat) and PYREXIA (fever/ low grade fever) had resolved. At the time of the report, SCIATICA (8 hours later experienced muscle pain at the lower back, sciatica like), ANXIETY (anxious) and PANIC ATTACK (panic attack) had not resolved and BRAIN FOG (brain fog and high blood pressure have been associated with the vaccination) outcome was unknown.      DIAGNOSTIC RESULTS (normal ranges are provided in parenthesis if available): On 01-Oct-2023, Blood pressure measurement: 172/105  high. On 01-Oct-2023, White blood cell count: 18 high. On 03-Oct-2023, Body temperature: 99.1  low grade fever.     For mRNA-1273.815 (SPIKEVAX 2023-2024 PFS) (Unknown), the reporter did not provide any causality assessments.   It was reported that, 8 hours later the patient experienced muscle pain at the lower back, sciatica like, which may not be directly associated with the vaccine. The patient asked if brain fog and high blood pressure had been associated with the vaccination. The patient was forgetting things like picking a bottle and not knowing where to place it. On Sunday, 01Oct2023, the patient started to feel anxious and the patient's blood pressure went up to 172/105. The patient could not get it to come down and then went to the emergency room. Tests were run and they found that the white blood cell count was high - 18. All other functions were normal except for a couple of tests which were slightly high. They were able to lower the blood pressure and the elevation may be due to panic attack, the patient stayed at the ER until midnight and was discharged without any medication. On 03Oct2023, the patient had cold sweat, low grade fever (99.1) for an hour but it went back to normal.  ]   This case was linked to US-MODERNATX, INC.-MOD-2023-743848 (E2B Linked Report).; Sender's Comments:  US-MODERNATX, INC.-MOD-2023-743848:Master case for SPIKEVAX 2023-2024 PFS