This an being a bit dizzy; have become very thirsty; Still having brain fog that comes and goes daily; Feeling like he had a brain fog/Feel strange and uncertain; Cheeks started to get a little flushed; something was affecting his memory during the brain fog; Neck muscles felt tight; Feeling fatigued; Shivering; Fatigue; This spontaneous case was reported by a consumer and describes the occurrence of FEELING ABNORMAL (Feeling like he had a brain fog/Feel strange and uncertain), FLUSHING (Cheeks started to get a little flushed), MEMORY IMPAIRMENT (something was affecting his memory during the brain fog), MUSCLE TIGHTNESS (Neck muscles felt tight) and DIZZINESS (This an being a bit dizzy) in an 81-year-old male patient who received mRNA-1273 (Moderna COVID-19 Vaccine) (batch nos. 030A21A and 013M20A) for COVID-19 vaccination. The occurrence of additional non-serious events is detailed below.     Concurrent medical conditions included Hypertension. Concomitant products included VALSARTAN for Blood pressure.   On 11-Feb-2021, the patient received first dose of mRNA-1273 (Moderna COVID-19 Vaccine) (Intramuscular) 1 dosage form. On 11-Mar-2021, received second dose of mRNA-1273 (Moderna COVID-19 Vaccine) (unknown route) dosage was changed to 1 dosage form. On 01-Apr-2021, the patient experienced FATIGUE (Fatigue). On 26-Apr-2021,  after starting mRNA-1273 (Moderna COVID-19 Vaccine), the patient experienced CHILLS (Shivering). On 28-Apr-2021, the patient experienced FATIGUE (Feeling fatigued). On 06-May-2021, the patient experienced FEELING ABNORMAL (Feeling like he had a brain fog/Feel strange and uncertain) and MEMORY IMPAIRMENT (something was affecting his memory during the brain fog). 06-May-2021, the patient experienced FLUSHING (Cheeks started to get a little flushed). 06-May-2021, the patient experienced MUSCLE TIGHTNESS (Neck muscles felt tight). On an unknown date, the patient experienced DIZZINESS (This an being a bit dizzy), THIRST (have become very thirsty) and FEELING ABNORMAL (Still having brain fog that comes and goes daily). On 29-Apr-2021, FATIGUE (Feeling fatigued) had resolved. On 06-May-2021, FEELING ABNORMAL (Feeling like he had a brain fog/Feel strange and uncertain), FLUSHING (Cheeks started to get a little flushed), MEMORY IMPAIRMENT (something was affecting his memory during the brain fog) and MUSCLE TIGHTNESS (Neck muscles felt tight) had resolved. At the time of the report, DIZZINESS (This an being a bit dizzy), CHILLS (Shivering) and FATIGUE (Fatigue) outcome was unknown and THIRST (have become very thirsty) and FEELING ABNORMAL (Still having brain fog that comes and goes daily) had not resolved.      DIAGNOSTIC RESULTS (normal ranges are provided in parenthesis if available): On 27-Apr-2021, Blood pressure measurement: 200/108 (High) Blood pressure shooting up 2000/108. On 27-Apr-2021, Blood test: normal (normal) Normal. On 05-May-2021, Blood pressure measurement: 140/57 (abnormal) blood pressure 140/57 at 09.40, 138/63 (abnormal) blood pressure 138/63 at 12.30 and 129/66 (abnormal) blood pressure 129/66 at 12.40. On 05-May-2021, Heart rate: 58 (Low) pulse 58 at 09.40, 70 (normal) pulse 70 at 12.30 and 70 (normal) pulse 70 at 12.40.         Treatment information was not provided.  Urine tests of the patient were  proven to be in normal range including his BP.   Most recent FOLLOW-UP information incorporated above includes: On 22-Jul-2021: Follow-up received contains significant information-New event: fatigue, dizzy, eye focusing started first and event start date as 01 Apr 2021, added lab data - Blood test, Urine test.