I almost collapsed as my left leg felt as if someone had taken a baseball bat and struck it. I thought I was paralyzed/ right leg is experiencing the same issues; pain in my left leg/ right leg is experiencing the same issues; tingling of the legs and feet; biting sensation, pain in both knees and my right shoulder where the booster shot was administered; biting sensation, pain in both knees and my right shoulder where the booster shot was administered; biting sensation, pain in both knees and my right shoulder where the booster shot was administered; legs feel unusually warm and tight; legs feel unusually warm and tight; soreness/ right shoulder began to feel as if someone had pulled it out of the socket when I made certain moves; every joint in my body was in pain; At times it feels as if I am being stuck with tiny needles over my body. Both shoulders are having the same sensation; This is a spontaneous report received from a contactable reporter(s) (Consumer or other non HCP). The reporter is the patient.  An 81-year-old patient received BNT162b2 (BNT162B2), in Jan2022 as dose number unknown (booster), single (Batch/Lot number: unknown), in right arm for covid-19 immunisation. The patient's relevant medical history included: "MS" (unspecified if ongoing), notes: I even had tests done to eliminate MS and Lupus.; "Lupus" (unspecified if ongoing), notes: I even had tests done to eliminate MS and Lupus. Concomitant medication(s) included: FLU VACCINE VII taken for immunisation. Vaccination history included: Covid-19 vaccine (Primary Immunization series complete but unknown manufacturer.), for Covid-19 immunization. The following information was reported: PAIN IN EXTREMITY (hospitalization) with onset 09Mar2022, outcome "unknown", described as "pain in my left leg/ right leg is experiencing the same issues"; MONOPLEGIA (hospitalization, medically significant) with onset 10Mar2022, outcome "unknown", described as "I almost collapsed as my left leg felt as if someone had taken a baseball bat and struck it. I thought I was paralyzed/ right leg is experiencing the same issues"; PARAESTHESIA (non-serious) with onset 2022, outcome "unknown", described as "At times it feels as if I am being stuck with tiny needles over my body. Both shoulders are having the same sensation"; ARTHRALGIA (non-serious) with onset 2022, outcome "not recovered", described as "every joint in my body was in pain"; FEELING HOT (non-serious), MUSCULOSKELETAL STIFFNESS (non-serious) all with onset Jun2022, outcome "unknown" and all described as "legs feel unusually warm and tight"; VACCINATION SITE PAIN (non-serious) with onset 2022, outcome "not recovered", described as "soreness/ right shoulder began to feel as if someone had pulled it out of the socket when I made certain moves"; PARAESTHESIA (non-serious), outcome "not recovered", described as "tingling of the legs and feet"; SENSORY DISTURBANCE (non-serious), ARTHRALGIA (non-serious), ARTHRALGIA (non-serious), outcome "not recovered" and all described as "biting sensation, pain in both knees and my right shoulder where the booster shot was administered". The events "soreness/ right shoulder began to feel as if someone had pulled it out of the socket when i made certain moves", "every joint in my body was in pain" and "at times it feels as if i am being stuck with tiny needles over my body. both shoulders are having the same sensation" required physician office visit. The events "i almost collapsed as my left leg felt as if someone had taken a baseball bat and struck it. i thought i was paralyzed/ right leg is experiencing the same issues" and "pain in my left leg/ right leg is experiencing the same issues" required physician office visit and emergency room visit. Therapeutic measures were taken as a result of monoplegia, pain in extremity, vaccination site pain, arthralgia, paraesthesia.  Clinical course: Patient was not including the 2 vaccine shots, as patient did not experience any side effects as having with the booster shot. In Jan2022 patient received Pfizer booster shot in right arm. Two weeks earlier, patient had annual flu shot in the left shoulder and thought it best to get the booster in the right shoulder. Patient experienced soreness but did not think about it until the soreness was not going away. Patient right shoulder began to feel as if someone had pulled it out of the socket when made certain moves. Over the weeks, it got worse. On 09Mar, patient noticed a pain in left leg. Had not fallen on bumped it. On the morning of 10Mar, patient almost collapsed as the left leg felt as if someone had taken a baseball bat and stuck it. Thought Patient was paralyzed. Patient got to the emergency room, and after taking tests was admitted into the hospital. There were no blood clots or circulation problems, but every joint in body was in pain. Patient was told to see an orthopedic doctor, which he/she did. And he advised physical therapy. Patient was in physical therapy starting 14Apr through 13May, 3 times a week. Patient right leg was experiencing the same issues. At times patient felt as if being stuck with tiny needles over body. Both shoulders are having the same sensation. Patient was not feeling like this until after taking the booster shot. In Jun2022, about 6 months since after getting the booster and every joint in body seems to be affected. Legs feel unusually warm and tight. One of the ongoing symptom is tingling of the legs and feet, biting sensation, pain in the both knees and right shoulder where the booster shot was administered at times still feel as if it is out of place. Patient have been following Physicians instructions with hopes that medications and therapy would be the answer. The therapy has helped somewhat with walking and mobility, but not with the joint pains. Patient was 81-years-old, but have never had this kind of problem before. Patient even had tests done to eliminate MS and Lupus.  The information on the batch/lot number for BNT162b2 has been requested and will be submitted if and when received.