This is a spontaneous report received from a contactable reporter(s) (Consumer or other non HCP) from medical information team. A female patient received bnt162b2 (BNT162B2), administration date 01Apr2021 (Batch/Lot number: unknown) as dose 2, single for Covid-19 immunisation. Relevant medical history included: "osteoporosis" (unspecified if ongoing), notes: they have osteoporosis they take medication for that. The patient took concomitant medications. Vaccination history included: Bnt162b2 (Dose 1), for COVID-19 immunization. The following information was reported: PAIN IN EXTREMITY (non-serious), VOMITING (non-serious), outcome "recovered" and all described as "I had the second shot; I had the sore arm and vomiting"; ARTHRALGIA (non-serious), MUSCLE TIGHTNESS (non-serious), outcome "recovered" and all described as "I had a problem for 4months with my joints and my muscles. My legs were so tight my left hip was popping and I couldn't move my left leg back very well"; MYALGIA (non-serious), ARTHROPATHY (non-serious), outcome "unknown" and all described as "I had a problem for 4months with my joints and my muscles. My legs were so tight my left hip was popping and I couldn't move my left leg back very well"; LYMPH NODE PAIN (non-serious), BURNING SENSATION (non-serious), outcome "recovered" and all described as "burning lymph nodes and burning down the legs". Additional information: Patient had taken the Moderna shot (further not clarified hence, suspect captured as per verbatim) because I had a hard time with the Pfizer, and they let me do that. So, patient went last March and had her first shot and patient just was tired and had little bit of sore arm and then three weeks later patient had the second shot on April 1st and on the second day patient had the sore arm and vomiting and her legs were so tight, and her joint hurt and it lasts for four months. Patient had a problem for 4 months with my joints and my muscles. her legs were so tight, her left hip was popping, and patient couldn't move her left leg back very well. So, patient went to her doctor, and she test her for Lyme disease and patient didn't have Lyme disease, but patient was bit by tick so that's why she said Well patient rule that out. She didn't think it was a Lyme disease thing. She said that it was a reaction to the Pfizer shot so patient want to know what is in the Pfizer shot that could have given me a problem. But patient also have muscle skeletal problem and patient take magnesium and omegas (further not clarified hence, magnesium and omegas captured as unspecified product). The omegas help me with the 'information' and the magnesium helps to relax her muscles and patient just wondering if patient had that reaction because of those vitamins that she takes. But patient have my best friend and her sister burning lymph nodes and burning down the legs they have osteoporosis they take medication for that and their lymph nodes when they have the second Pfizer shot their lymph nodes were burning under their arm pits and at the back of their legs for seven weeks and then it went away (further clarifications unknown, split not made). So, patient speak to her girlfriend when it was time for us in Oct to get a booster. Patient said what her need to do is take the Moderna shot do not take another Pfizer shot and they let us do the change and I was happy to do the Moderna shot patient reacted very well and her girlfriend and her sister did as well. But they are saying in Oct it looks like this Oct we may need another booster and to take the Moderna, but patient want to know the difference between the Pfizer and Moderna because patient listened to the politics shows on Sunday and (voice not clear) being interviewed the scientists and scientists said by the seventh time this virus mutates. These shots are not going to cover for that, so they are making a whole new series of shots (further not clarified) and they are going to want people to get booster but they not going to force people to do that. It's going to be their own decision so patient want to know if they are changing these medications these shots and patient understand what's coming down the pike and to be prepared for, but patient don't want to experience what she experienced again, and patient don't want to see my good friend and her sister to have same problem either and everybody else patient knows reacted. But patient hear lot of older people (further clarifications unknown) had a bad experience from the second Pfizer shot. But patient didn't get in all their personal business. Patient have with my girlfriend and myself because of this you know because we are close. So, do you know patient am told that the Pfizer doesn't not have egg white and latex. I was told when we had got the shot that's all that we were told (further not clarified). So, do you know what's been there that we have been reacted to and if the future shot going to carry that same drug or whatever it is in there?" Consumer was informed about the role of Pfizer Drug Safety and Pfizer Medical information Department for the concern. Consumer was provided with Pfizer Medical information Department number as Option 8am to 9pm, M-F, EST. Other medical condition: Consumer stated, "The only thing patient have is muscle skeletal problem from Whiplash years ago (further not clarified) patient get degenerating disc her my neck and back that's why patient take the magnesium and patient see the chiropractor. Patient been going there ever since 2001. Patient having problem since." (Further clarifications unknown) Treatment: Consumer stated, "No patient don't take any medication. If patient take anything it's Tylenol, extra strength Tylenol and patient rubbed it (voice not clear) in vein when she muscle were so tight and patient went through bottles and bottles of (voice not clear) and patient took Tylenol." The lot number for bnt162b2 was not provided and will be requested during follow up.