Sometimes I don't hear real well; Terrible reaction to my muscles and my joints;   could not move, I could not get out of bed; muscles and joints were like frozen; Terrible reaction to my muscles and my joints;   could not move, I could not get out of bed; muscles and joints were like frozen; the main muscles in my upper arms were so sore; When I would stand up it seems like it was just intense pain that went from; under my shoulders; around through the, bicep and all the way down my body; I could hardly walk; I am tired; This is a spontaneous report received from a contactable reporter(s) (Consumer or other non HCP). The reporter is the patient.  An 83-year-old female patient received BNT162b2 (BNT162B2), on 05Apr2022 as dose 4 (booster), single (Batch/Lot number: unknown) at the age of 82 years, in left arm for covid-19 immunisation. The patient's relevant medical history included: "Low thyroid" (unspecified if ongoing). Concomitant medication(s) included: LEVOTHYROXINE taken for thyroid disorder. Vaccination history included: Bnt162b2 (DOSE 3(BOOSTER), SINGLE), for COVID-19 immunization; Bnt162b2 (DOSE 2, SINGLE), for COVID-19 immunization; Bnt162b2 (DOSE 1, SINGLE), for COVID-19 immunization. The following information was reported: HYPOACUSIS (non-serious), outcome "unknown", described as "Sometimes I don't hear real well"; MUSCULOSKELETAL STIFFNESS (non-serious), JOINT STIFFNESS (non-serious), outcome "unknown" and all described as "Terrible reaction to my muscles and my joints; could not move, I could not get out of bed; muscles and joints were like frozen"; MYALGIA (non-serious), outcome "unknown", described as "the main muscles in my upper arms were so sore"; PAIN (non-serious), outcome "unknown", described as "When I would stand up it seems like it was just intense pain that went from; under my shoulders; around through the, bicep and all the way down my body"; GAIT DISTURBANCE (non-serious), outcome "unknown", described as "I could hardly walk"; FATIGUE (non-serious), outcome "unknown", described as "I am tired". Relevant laboratory tests and procedures are available in the appropriate section.  Additional information: Consumer stated, "I did not had any reactions to the first three but on this particular second booster, I have had a terrible reaction to my muscles and my joints and I have been fighting this. My muscles and joints were like frozen and I just could not move out of bed and it took me quite a while to find. I think, I kept rubbing my leg or trying to make it move or actually helping it to move with both of my hands but it was hard to do that too because the main muscles in my upper arms were so sore and my legs. So, when I would stand up it seems like it was just intense pain that went from my I guess just under my shoulders. I guess it was around through the bicep starts you know, the bicep and all the way down my body and I could hardly walk." Consumer stated, "I have a question. I have been through steroid (Later clarified as Prednisone and captured as Suspect conservatively) and after the steroid were up, I still have this type of pain in my muscles. So, first of all, did I called the right number to report this?" Treatment for Adverse Event: Consumer stated, "My doctor had recommended a steroid, Prednisone. Well, this is crazy I took the first pill and I thought I was cured so of course I wasn't, but you know it started working right away and I just about 3 days ago you know you have to wean off of it so, I took my last pill you know, I had series of 5 days where I took 4 a day for 5 days, and then I took 2 a day for 5 days and then I took one a day for 5 days so, that's how I took it, does that make sense?"  The information on the batch/lot number for BNT162b2 has been requested and will be submitted if and when received.