Sore arm/ arm hurt a little bit the next day; This is a spontaneous report received from contactable reporter(s) (Consumer or other non HCP). The patient was reporter's sister.  A 78 year-old female patient received bnt162b2 (BNT162B2), administration date Mar2021 (Batch/Lot number: unknown) at the age of 78 years as dose 1, single for covid-19 immunisation. Relevant medical history included: "Open heart surgery" (unspecified if ongoing), notes: Open heart surgery a couple years ago or maybe longer than that; "Fell and broke shoulder" (unspecified if ongoing), notes: The patient fell and broke her shoulder 2-3 years ago; "Diabetes" (ongoing), notes: The patient was diagnosed with diabetes a long long time ago; "Fell and broke shoulder" (unspecified if ongoing), notes: The patient fell and broke her shoulder 2-3 years ago. The patient took concomitant medications. The following information was reported: PAIN IN EXTREMITY (non-serious) with onset Mar2021, outcome "unknown", described as "Sore arm/ arm hurt a little bit the next day". Relevant laboratory tests and procedures are available in the appropriate section.  Additional information: Reason for no lot number: of Covid-19 vaccine: Other: Information was not provided by the caller for her sister's injection. Expiry Date of Covid-19 vaccine: Not Provided. Why was the patient taking Covid-19 vaccine: Because she doesn't want to get covid. Other Products: Unknown. Patient History: Yes. Patient history: Open heart surgery (From: Unspecified To: Unspecified), additional Information for Other Conditions: Caller reported that the patient had open heart surgery a couple years ago or maybe longer than that. Patient history: Fell and broke shoulder (From: Unspecified To: Unspecified), additional Information for Other Conditions: Caller reported that the patient fell and broke her shoulder 2-3 years ago. Patient history: Diabetes (From: Unspecified To: Ongoing), additional Information for Other Conditions: Caller reported that the patient was diagnosed with diabetes a long long time ago. Investigation Assessment: Unknown. Additional Context: Clone to Report, While completing a report for herself, the caller mentioned that that her sister, had a sore arm following the Pfizer Covid-19 vaccine. Caller states that her sister's husband also got a shot, and he did not have any problems or anything. Patient Details: Age: Caller provided her sister's age as 78. Height: Caller reported that her sister was smaller than the caller, and stated her sister was probably 5'3" or 5'2". Weight: Caller reported she was unsure of his sister's weight, maybe 140. Reporter Details: Email: Caller reported that she doesn't really use email and she doesn't have a computer. Caller reported that she does have email on her phone but doesn't really use that. Caller declined to provide email address. HCP: Caller reported that the patient used the same physician as caller does. Caller was unable to provide street number, zip code, or email address for HCP. Event Details: Sore arm: Caller reported that she and the patient had been talking and the patient reported that her arm hurt a little bit the next day. Caller reported that the patient didn't have any problems or anything. Caller reported that the patient stated that she didn't even know that she had a shot. Suspect Product: Caller stated that she received her first dose of the Pfizer Covid-19 vaccine on 03Mar2021 and that her sister received the product, either that same day or maybe the morning after on 04Mar2021, and that her sister went to the same vaccination location and received the same vaccine. Caller unable to provide the NDC number, lot number, or expiration date for her sister's vaccine. Concomitant products: Caller reported that the patient takes a lot of medications. Caller reported that the patient takes heart medication, but the caller doesn't know what those medications are. Vaccine Supplemental Form: Patient Details: See formal field. Time the Vaccination Was Given: unknown. Anatomical Location of Administration of Pfizer vaccine considered as suspect: Unknown. Vaccination Facility Type: Pharmacy/Drug Store. Vaccine Administered at Military Facility: No. Vaccination Facility Address: provided. Caller did not know street number of the facility. Phone: Unknown. History of all previous immunization with the Pfizer vaccine considered as suspect: N/A, first dose. Additional Vaccines Administered on Same Date of the Pfizer Suspect: Unknown. Adverse Event (AE) Details: See formal field: Did any AE(s) require a visit to: Emergency Room: No. Physician Office: No. Prior Vaccinations (within 4 weeks): Unknown. AE(s) following prior vaccinations: Unknown. Patient's Medical History (including any illness at time of vaccination): See formal field. Family Medical History Relevant to AE(s): No. Relevant Tests: Unknown.  No follow-up attempts are possible; information about lot/batch number cannot be obtained. No further information is expected.