muscle pain; joint pain; Debilitating leg pain; When she goes from a sitting position or a lying position to a standing position, her entire body locks up, majority in her legs and her feet go flat; Her knees lock up; I am standing, I am okay but  it is progressively getting worse/debilitating leg pain was reported as worsened; Having trouble going from sitting or laying position to standing without assistance, once I am up, I am standing, I am okay but  it is progressively getting worse; When she walks she's in pain; 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.  A 55 year-old female patient received bnt162b2 (BNT162B2), intramuscular, administered in deltoid left, administration date 21Aug2021 (Lot number: FD8448, Expiration Date: 31Oct2021) at the age of 55 years as dose 2, single for covid-19 immunisation. The patient had no relevant medical history. There were no concomitant medications. Vaccination history included: Bnt162b2 (Dose: 1, Lot: EW0180, Exp: 31Aug2021             , Intramuscularly in left deltoid), administration date: 31Jul2021, when the patient was 55 years old, for COVID-19 Immunization. The following information was reported: PAIN IN EXTREMITY (non-serious) with onset 21Aug2021, outcome "not recovered", described as "Debilitating leg pain"; DYSSTASIA (non-serious) with onset 2021, outcome "not recovered", described as "Having trouble going from sitting or laying position to standing without assistance, once I am up, I am standing, I am okay but  it is progressively getting worse"; PAIN (non-serious) with onset 2021, outcome "unknown", described as "When she walks she's in pain"; DYSKINESIA (non-serious) with onset 21Aug2021, outcome "not recovered", described as "When she goes from a sitting position or a lying position to a standing position, her entire body locks up, majority in her legs and her feet go flat"; JOINT LOCK (non-serious) with onset 2021, outcome "unknown", described as "Her knees lock up"; CONDITION AGGRAVATED (non-serious) with onset 2021, outcome "unknown", described as "I am standing, I am okay but  it is progressively getting worse/debilitating leg pain was reported as worsened"; MYALGIA (non-serious), outcome "unknown", described as "muscle pain"; ARTHRALGIA (non-serious), outcome "unknown", described as "joint pain". No follow-up attempts are possible. No further information is expected.  Additional information: Caller was a 55 years old patient who received the 2nd dose of the adult Pfizer Covid vaccine on 21Aug2021, and has been complaining of "debilitating leg pain, having trouble going from sitting or laying position to standing without assistance, once I am up, I am standing, I am okay but  it is progressively getting worse. And was asking Have these side effects been reported before?. Side effects that have been reported with the vaccine include: muscle pain joint pain. Event: debilitating leg pain was reported as worsened. Event: entire body locks up, majority in her legs and her feet go flat was reported as worsened.  Caller was a consumer calling about the Covid Vaccine. She had the first and second dose of the vaccine. She stated that after she got the second shot, from that moment on she has had debilitating leg pain. When she goes from a sitting position or a lying position to a standing position, her entire body locks up, majority in her legs and her feet go flat. She cannot even straighten them and when she walks she's in pain. This happens every single day and every single time she tries to stand. It lasts probably 10 minutes each time it happens. Once she gets going though, she can walk for miles. She feels like this is some kind of side effect in the medication. Like it is some build up in her body. It was like her body has decided to contract or tighten where her knees lock up, cant bend her knees and her feet are flat and frozen in place. She cannot get herself up with just her legs and has to use her arms to get up.  She wants Pfizer to get her seen by a doctor because this was related to the vaccine and she does not have insurance. She wants to know if other people have reported this after the vaccine with the same LOT number. There was no emergency room visit and No physician office visit. But it would've required a visit to the doctor's office but she does that have insurance in this state. There was no prior vaccination within four weeks prior to the first administration date of the suspect vaccine(s).   Follow-up attempts are completed. No further information is expected.