experiencing muscle pain her back/the muscle pain is in her back and it's kind of strenuous and painful; 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 65 year-old female patient received bnt162b2 (BNT162B2), administered in arm, administration date 21Sep2021 (Batch/Lot number: unknown) at the age of 65 years as dose 2, single for covid-19 immunisation. Relevant medical history included: "bronchitis" (unspecified if ongoing). The patient took concomitant medications. Vaccination history included: Bnt162b2 (Dose:1, lot: PF2689 or 2F2689, Anatomical location:arm), administration date: 31Aug2021, when the patient was 65 years old, for COVID-19 Immunization. The following information was reported: MYALGIA (non-serious) with onset Dec2021, outcome "not recovered", described as "experiencing muscle pain her back/the muscle pain is in her back and it's kind of strenuous and painful".  Upon follow up 18Jan2022 updated information included reporter contact information added. Patient DOB added. AE "the muscle pain is in her back and it's kind of strenuous and painful.Caller states she was just speaking to her manager and she is thinking her muscle pain is from after the vaccine, 2 shots, but it's more than 3 weeks apart since she had that. Caller states it's been more than 3 weeks since she had the shot and she is having muscle pain now and would like to know if we have any suggestions. Caller relays that the muscle pain is in her back and it's kind of strenuous and painful. Reporter Details: Caller declines to provide email. Patient Details: Patient states that the muscle pain has been for about 3 weeks. States she is 63. Prescribing Healthcare Professional Info: Caller declines stating she just spoke to her case worker. Caller states she has had the muscle pain for about 3 weeks and it is getting painful.Caller states she didn't know who to call, she is wanting the next vaccine but wanted to let us know that if she is having a painful reaction to something should she get that vaccine. Suspect Product: Pfizer BioNTech Covid 19 vaccine. Caller states her 1st dose was on 21Dec2021 in her arm, does not recall which side, in the morning. Caller then clarifies her 1st dose was on 31Aug2021. Caller does not have NDC or expiry to provide. States lot is PF2689 or 2F2689.Caller states her 2nd dose was on 21Sep2021 in her shoulder, does not recall which side, in the morning. Caller does not have NDC or expiry to provide. States the lot is E100186 or EL10086.Caller is asking does it make sense for her to talk to the call handler as a representative about her muscle pain. Caller states she was just speaking to her manager and she is thinking her muscle pain is from after the vaccine, 2 shots, but it's more than 3 weeks apart since she had that. Caller states it's been more than 3 weeks since she had the shot and she is having muscle pain now and would like to know if we have any suggestions. Caller relays that the muscle pain is in her back and it's kind of strenuous and painful. Reporter Details: Caller declines to provide email. Patient Details: Patient states that the muscle pain has been for about 3 weeks. States she is 63. Prescribing Healthcare Professional Info: Caller declines stating she just spoke to her case worker. Caller states she has had the muscle pain for about 3 weeks and it is getting painful.Caller states she didn't know who to call, she is wanting the next vaccine but wanted to let us know that if she is having a painful reaction to something should she get that vaccine. Suspect Product: Pfizer BioNTech Covid 19 vaccine. Caller states her 1st dose was on 21Dec2021 in her arm, does not recall which side, in the morning. Caller then clarifies her 1st dose was on 31Aug2021. Caller does not have NDC or expiry to provide. States lot is PF2689 or 2F2689. Caller states her 2nd dose was on 21Sep2021 in her shoulder, does not recall which side, in the morning. Caller does not have NDC or expiry to provide. States the lot is E100186 or EL10086. .Concomitant Medication: No, she is on a new medicine but if she puts her finger on it, no that did not cause the pressure in her back. No follow-up attempts are possible; information about lot/batch number cannot be obtained. No further information is expected.