Knees swollen; Knees hurt like heck; could not walk; could not kneel; She had a deep tissue massage that was very painful and the person had to separate the tendon and ligament; Felt like vomiting; She just felt generally horrible in her body; This is a spontaneous report received from a contactable reporter(s) (Consumer or other non HCP) from medical information team. The reporter is the patient.  77 year-old female patient received bnt162b2 (BNT162B2), administration date 27Mar2021 11:00 (Batch/Lot number: unknown) at the age of 77 years as dose 1, single for covid-19 immunisation. The patient's relevant medical history and concomitant medications were not reported. The following information was reported: JOINT SWELLING (non-serious) with onset 27Mar2021 17:00, outcome "not recovered", described as "Knees swollen"; JOINT INJURY (non-serious) with onset 27Mar2021 17:00, outcome "not recovered", described as "Knees hurt like heck"; GAIT INABILITY (non-serious) with onset Mar2021, outcome "not recovered", described as "could not walk"; MUSCULOSKELETAL DISCOMFORT (non-serious) with onset Mar2021, outcome "not recovered", described as "could not kneel"; MYALGIA (non-serious) with onset Mar2021, outcome "unknown", described as "She had a deep tissue massage that was very painful and the person had to separate the tendon and ligament"; NAUSEA (non-serious) with onset Mar2021, outcome "unknown", described as "Felt like vomiting"; MALAISE (non-serious) with onset Mar2021, outcome "unknown", described as "She just felt generally horrible in her body". Therapeutic measures were taken as a result of joint swelling, joint injury, myalgia.  Additional information: The caller states she was a patient who took the Pfizer vaccine on 27Mar2021. She states her knees hurt like heck and all swollen and continues to experience this until today. She just felt generally horrible in her body. Her knees were swollen so bad she thought she needed a knee replacement. She stated that her body had recovered to around 98 %. She is still having trouble walking because of the adverse effects and is concerned that her side effects might be more severe after the second dose. She states it's taken this long for the swelling to stop, and that's because she had a deep tissue massage that was very painful, and the person had to separate the tendon and ligament. She states she could not kneel or walk. When she walked, she had this whole general feeling like she wanted to vomit in her body. Normally, she would walk 3 miles a day. Of course, she was walking on her legs, but it just set up something in the body and she just felt like vomiting. She couldn't really walk. She tried to push through it, but her knee would simply swell more. She states it took from 27Mar2021 to today, to be 98 % back to what her knees were before. The caller is calling because she wants to know does she get a second shot? Or does she end up with the same reaction to start the process over with? She was instructed by (name withheld) to call Pfizer since Pfizer has just been accredited a license by whatever government agency for the vaccine. She states (name withheld) Medical System said Pfizer would have the most information on negative reactions with the COVID vaccine. Caller declined to complete a report stating unless this documentation helps her decide to take the second shot. The caller asks if the call handler is able to help her. She is dismayed because she was told Pfizer would have information. She would like to know the specificity of a bad reaction and what it does to her body? What is the second shot going to do?  The caller asks what the Pfizer shot can do to blow up her knees like that? She knows reactions are very specific to each individual. She states the doctors don't know. She was told Pfizer would know because they just authorized the COVID vaccine to be a legitimate and verifiable vaccine, so they should be able to say what it's going to do. She doesn't want it blowing up her knee again, or her heart or her head or body. Caller declined to complete a report at this time. Investigation assessment was not provided.  No follow-up attempts are possible; information about lot/batch number cannot be obtained. No further information is expected.