her arm started to hurt from the elbow down/ aching from elbow down to hand/ arm aches a bit; her arm started to hurt from the elbow down/ aching from elbow down to hand/ arm aches a bit; hurt when they put the needle in; she's gained a little weight; This is a spontaneous report received from contactable reporter(s) (Consumer or other non HCP) from medical information team. The reporter is the patient.  A 91 year-old female patient received BNT162B2 (PFIZER-BIONTECH COVID-19 VACCINE), administered in arm left, administration date 10Mar2021 (Batch/Lot number: unknown) at the age of 91 years as dose 1, single for COVID-19 immunisation. Relevant medical history included: "blood pressure" (unspecified if ongoing); "blood pressure cuff" (unspecified if ongoing). Concomitant medication(s) included: AMLODIPINE BESYLATE taken for blood pressure (ongoing); ANASTROZOLE taken for hormone (ongoing); PROLIA taken for fracture. Vaccination history included: Flu, for immunisation The following information was reported: VACCINATION SITE PAIN (non-serious) with onset 10Mar2021, outcome "recovered" (10Mar2021), described as "hurt when they put the needle in"; PAIN IN EXTREMITY (non-serious), ARTHRALGIA (non-serious) all with onset 13Mar2021, outcome "not recovered" and all described as "her arm started to hurt from the elbow down/ aching from elbow down to hand/ arm aches a bit"; WEIGHT INCREASED (non-serious) with onset Mar2021, outcome "unknown", described as "she's gained a little weight". Therapeutic measures were taken as a result of pain in extremity, arthralgia.  Additional information: The time of vaccination was 113:0-11:45. The patient had no history of previous immunization with the Pfizer vaccine considered as suspect. The patient did not receive vaccines administered on same date with the Pfizer vaccine considered as suspect. The patient had no prior vaccinations within 4 weeks. She takes 5mg for her blood pressure. Her doctor put her on 10mg and it did not do much good at 10mg and her feet swelled. Then her doctor put her back on 5mg and she cuts the 10mg tablets in half. The medication was Amlodipine Besylate. Clinical course: She received it on 10Mar202 and it hurt when they put the needle in but other than that there was no bleeding and no spot. She thought this was great. The next morning, 11Mar2021, she went back to doing her blood pressure test. Now she wonders if the shot has affected her arm. She did the blood pressure check a few more times and the arm started to hurt on 13Mar2021. She gets through the day and everything is fine until around 16:00 or 16:45 then the arm started to hurt, from the elbow down. The other part of her arm up to where the shot was hurt, but mostly the arm from the elbow down to the hand. She massages it. And it is gotten worse. She stopped checking her blood pressure on that arm. Clarified she was using a blood pressure cuff on the arm she received the injection in to check her blood pressure. Her doctor told her to check her blood pressure in the morning after she uses the bathroom. Nothing ever hurts with her flu shots, but this one hurt for a bit. She knew the injection was going in. The events did not result to Emergency Room or Physician Office visit.  No follow-up attempts are possible; information about lot/batch number cannot be obtained. No further information is expected.