she thought she was going to black out; felt warm to touch; could not remember things, did not recognize names of medications the patient had regularly taken for years, had no memory of the fact that the patient had no memory; feel the fogginess/ fog mentally/could not understand or recognize simple words; heavy head; little bit warm where the vaccination was given; arm was swollen; arm was tender; arthrtic pain on the joints; chills; got the Moderna booster on Sunday, got the J and J vaccine back in 12-Mar-2021; This spontaneous case was reported by a consumer and describes the occurrence of FEELING HOT (felt warm to touch), MEMORY IMPAIRMENT (could not remember things, did not recognize names of medications the patient had regularly taken for years, had no memory of the fact that the patient had no memory), FEELING ABNORMAL (feel the fogginess/ fog mentally/could not understand or recognize simple words), PRESYNCOPE (she thought she was going to black out) and COVID-19 IMMUNISATION (got the Moderna booster on Sunday, got the J and J vaccine back in 12-Mar-2021) in a 90-year-old female patient who received mRNA-1273 (Moderna COVID-19 Vaccine) for COVID-19 vaccination. The occurrence of additional non-serious events is detailed below.     Previously administered products included for COVID-19 vaccination: COVID-19 VACCINE JANSSEN (she got the J&J vaccine back in 12Mar2021) on 12-Mar-2021. Past adverse reactions to the above products included No adverse event with COVID-19 VACCINE JANSSEN. Family history included Aneurysm cerebral (patient's mother has a brain aneurism history, 56 years ago). Concurrent medical conditions included Arthritic pains and Blood pressure high. Concomitant products included PARACETAMOL (TYLENOL [PARACETAMOL]) for an unknown indication.    On 14-Nov-2021, the patient received third dose of mRNA-1273 (Moderna COVID-19 Vaccine) (unknown route) 1 dosage form. On 14-Nov-2021, the patient experienced COVID-19 IMMUNISATION (got the Moderna booster on Sunday, got the J and J vaccine back in 12-Mar-2021). On 15-Nov-2021, the patient experienced ARTHRALGIA (arthrtic pain on the joints) and CHILLS (chills). On 16-Nov-2021, the patient experienced FEELING HOT (felt warm to touch), MEMORY IMPAIRMENT (could not remember things, did not recognize names of medications the patient had regularly taken for years, had no memory of the fact that the patient had no memory), FEELING ABNORMAL (feel the fogginess/ fog mentally/could not understand or recognize simple words), HEAD DISCOMFORT (heavy head), VACCINATION SITE WARMTH (little bit warm where the vaccination was given), VACCINATION SITE SWELLING (arm was swollen) and VACCINATION SITE PAIN (arm was tender). On an unknown date, the patient experienced PRESYNCOPE (she thought she was going to black out). On 14-Nov-2021, COVID-19 IMMUNISATION (got the Moderna booster on Sunday, got the J and J vaccine back in 12-Mar-2021) had resolved. On 16-Nov-2021, MEMORY IMPAIRMENT (could not remember things, did not recognize names of medications the patient had regularly taken for years, had no memory of the fact that the patient had no memory), FEELING ABNORMAL (feel the fogginess/ fog mentally/could not understand or recognize simple words) and HEAD DISCOMFORT (heavy head) had resolved. At the time of the report, FEELING HOT (felt warm to touch), VACCINATION SITE WARMTH (little bit warm where the vaccination was given), VACCINATION SITE SWELLING (arm was swollen), VACCINATION SITE PAIN (arm was tender), ARTHRALGIA (arthrtic pain on the joints) and CHILLS (chills) outcome was unknown and PRESYNCOPE (she thought she was going to black out) had resolved.      DIAGNOSTIC RESULTS (normal ranges are provided in parenthesis if available): On an unknown date, Blood pressure measurement: 98/65 (Low) 98/65 : very low.. On an unknown date, Body temperature: 98.3 (normal) 98.3 degree Fahrenheit.         Patient took blood pressure pill very low dose on the evening as concomitant drug product.  No treatment medication was reported by the reporter.  Company comment : This is a case of Covid-19 immunization (Revaccination with a different Covid-19 vaccine) concerning a 90-year-old, female patient, with no relevant medical history, who experienced the non-serious, unexpected events of memory impairment, presyncope, feeling hot, feeling abnormal and vaccination site warmth. The events occurred  1 day after booster dose of mRNA 1273 vaccine. The patient initially had J and J vaccine as primary dose, and had Moderna booster 8 months after. The patient felt foggy mentally, could not remember the names of her medications, could not understand simple words, her head was so heavy and she felt like she was going to black out. She was ok after an hour or two. The rechallenge is not applicable as there is no additional dose expected. The patient's age may be a confounding factor to the events memory impairment and feeling abnormal. The benefit-risk relationship of mRNA 1273 vaccine is not affected by this report.; Sender's Comments: This is a case of Covid-19 immunization (Revaccination with a different Covid-19 vaccine) concerning a 90-year-old, female patient, with no relevant medical history, who experienced the non-serious, unexpected events of memory impairment, presyncope, feeling hot, feeling abnormal and vaccination site warmth. The events occurred  1 day after booster dose of mRNA 1273 vaccine. The patient initially had J and J vaccine as primary dose, and had Moderna booster 8 months after. The patient felt foggy mentally, could not remember the names of her medications, could not understand simple words, her head was so heavy and she felt like she was going to black out. She was ok after an hour or two. The rechallenge is not applicable as there is no additional dose expected. The patient's age may be a confounding factor to the events memory impairment and feeling abnormal. The benefit-risk relationship of mRNA 1273 vaccine is not affected by this report.