lactic acid was high; dementia had suddenly progressed; spot where her lung was starting to collapse; potassium, Vitamin D and Vitamin B12 were low; potassium, Vitamin D and Vitamin B12 were low; potassium, Vitamin D and Vitamin B12 were low; stopped talking; Cellulitis in her arm/ cellulitis was further down her arm, around her wrist hand area (Her wrist was huge, hot, red, and her hand was swollen); it burned when she peed; blood in her urine; wanted to sleep/getting worse with sleeping; was shutting down; she was dehydrated because her urine was dark; urine was dark; began just feeling bad/having like a terrible time/having a hard time/really not feeling good; more confused; lethargic; had trouble her getting up/was having to do everything for her, feed her, bathe her; couldn't walk; lost her appetite; arm was sore; This is a spontaneous report from a contactable consumer (patient's daughter). An 83-year-old female patient received the second dose of BNT162B2 (PFIZER-BIONTECH COVID-19 VACCINE, lot number: EL3247), via an unspecified route of administration, administered in the left arm, on 24Feb2021, as single dose, for COVID-19 immunisation.  Medical history included mild asthma, dementia (moments like putting things in the wrong place and being forgetful) and was confused. There were no concomitant medications. Historical vaccine included the first dose of BNT162B2 (PFIZER-BIONTECH COVID-19 VACCINE, lot number: EK9231) received at age 83 years, on 03Feb2021, for COVID-19 immunisation. On 24Feb2021, after the second vaccinations, the patient's arm was sore. On 06Mar2021, the patient began just feeling bad, was having like a terrible time, having a hard time, was really not feeling good; was more confused; lethargic; had trouble getting her up, was having to do everything for her, feed her, bathe her; couldn't walk and lost her appetite. On 09Mar2021, the patient was shutting down. On the same day at 18:30, the patient had gone in the bathroom and said it burned when she peed. So, the patient was taken to urgent care so it would not get out of hand. At the urgent care, they said she has a UTI, there was blood in her urine so they gave her Cipro but they cultured her urine and it grew no bacteria but there was still blood in her urine and she was getting worse with sleeping and she didn't even get up to eat. The patient was also dehydrated and her urine was dark. The events dehydrated, urine was dark, it burned when she peed, blood in her urine required emergency visit on 16Mar2021. The reporter thought the patient was going to die. On 16Mar2021, in the ER, they did blood work (unknown result), chest xray which showed she had a spot where her lung was starting to collapse (they said it was a tiny place, from not getting up and moving around, they said it would correct itself) and the patient's potassium, Vitamin D and Vitamin B12 were low. They did a CT scan of the head and chest to look for stroke or seizure and there was nothing. They blamed it on her dementia that had suddenly progressed. The patient was hospitalized from 16Mar2021 to 18Mar2021. On 12Mar2021, the patient experienced cellulitis in her arm. The reporter clarified that the cellulitis was further down her arm, around her wrist hand area. Her wrist was huge, hot, red, and her hand was swollen. On 24Mar2021, the patient followed up with the family doctor because the hospital wanted her to follow up with a GYN because they didn't feel it was urinary at all. When the reporter took the patient in to see the doctor, she couldn't walk in, she had to roll her in a wheelchair, she had stopped talking again. On 26Mar2021, the doctor sent the patient to the emergency room (unspecified reason) and they kept her. They said her said lactic acid was high. She was admitted on 26Mar2021 and discharged on 29Mar2021. On 29Mar2021, the patient's potassium was 3.3 and her lactic acid level was back to 2. The patient was recovering from lactic acid was high; potassium, Vitamin D and Vitamin B12 were low; began just feeling bad/having like a terrible time/having a hard time/really not feeling good; more confused; lethargic; had trouble her getting up/was having to do everything for her, feed her, bathe her; couldn't walk; lost her appetite; was shutting down; stopped talking. The patient recovered from cellulitis in her arm/ cellulitis was further down her arm, around her wrist hand area (Her wrist was huge, hot, red, and her hand was swollen) in Mar2021; and arm was sore on 29Mar2021. The outcome of events spot where her lung was starting to collapse, dementia had suddenly progressed; she was dehydrated because her urine was dark; it burned when she peed; blood in her urine; and wanted to sleep/getting worse with sleeping was unknown.