Could stand, couldn't walk; Swollen lymph nodes in left arm; neck ache; Frontal headache; Heaviness and soreness in arms; Heaviness and soreness in arms; has a sore spot only where the COVID vaccine was; This is a spontaneous report from a contactable pharmacist (patient).  A 60-year-old female patient received the second dose bnt162b2 (PFIZER-BIONTECH COVID-19 VACCINE, batch/lot number: EN9581), via an unspecified route of administration on 04Feb2021 at 10:20 at SINGLE DOSE in left arm for covid-19 immunisation. Medical history included ongoing multiple sclerosis. There were no concomitant medications. The patient previously received the first dose bnt162b2 (Lot: EL3249) on 14Jan2021 for COVID-19 immunisation and experienced couldn't re stand. The patient experienced could stand, couldn't walk on 05Feb2021, frontal headache, heaviness and soreness in arms on 04Feb2021, swollen lymph nodes in left arm on 05Feb2021, neck ache on 04Feb2021 at 22:00, had a sore spot only where the covid vaccine was in Feb2021. Event details: The patient had the second COVID vaccine on 04Feb2021. Was fine that day. Had heaviness in her arm and little bit of headache. Was fine the day of the shot. 04Feb2021, felt a little heavy in the arm where she got the COVID shot. Received COVID vaccine in left arm. Drove home and was fine. Sat down and watched TV and had a frontal headache. Took Tylenol. By the time she went to bed, around 10:00 PM, her neck was so sore to turn from side to side. On top of her arms where shoulder pads would be is there the heaviness was. Both arms became sore. It was manageable and she took Tylenol. Eventually it went away. Friday morning 05Feb2021 when she got up, got to the point where she got out of bed and couldn't get up. There was no possible way for her to get up. Her husband had to buy her a 3-in-1 potty chair so she could just stand and pivot, seriousness was provided as disabling, could understand hospitalization, but confirmed she never went to the hospital. Could not rest that day or go back to the bathroom. Didn't walk anywhere. Was in a chair that she could sleep in. Husband bought her a potty chair. Was able to use the lift on the lift chair later that afternoon. Definitely debilitating. Sister who was an orthopedist nurse had to help her and secured she wouldn't fall. The patient had swollen lymph nodes only in the left arm on 05Feb2021. At time of reporting the patient had a sore spot only where the COVID vaccine was. It was not red. Only sure up underneath and when it was touched. The outcome of events could stand, couldn't walk, heaviness and soreness in arms was resolved on 06Feb2021, outcome of other events was unknown.; Sender's Comments: Based on available information, due to close temporal association, a possible contribution roe of bnt162b2 to the onset of "unable to walk" cannot be excluded.  The case will be reassessed should additional information become available.  The impact of this report on the benefit/risk profile of the Pfizer product is evaluated as part of Pfizer procedures for safety evaluation, including the review and analysis of aggregate data for adverse events. Any safety concern identified as part of this review, as well as any appropriate action in response, will be promptly notified to Regulatory Authorities, Ethics Committees and Investigators, as appropriate.