walking is still very bad; lower back pain; he reported lower back pain, that has migrated more to the right hip and into the glute; he reported lower back pain, that has migrated more to the right hip and into the glute; it might be kidney pain; arm pain; This is a spontaneous report from a contactable other Health Professional (HCP). A 71-year-old male patient received first dose of bnt162b2 (PFIZER-BIONTECH COVID-19 VACCINE, Batch/lot number: EL3302), intramuscular on 22Jan2021 15:10 at 0.3 mL, single (0.3ml by intramuscular injection left shoulder) for COVID-19 prophylaxis. Medical history included ongoing high blood pressure (diagnosed about 21 years ago), ongoing gout (Diagnosed about 2 years ag), ongoing ankle spur right foot, ongoing diminished cartilage both knees, joint pain. The concomitant medications included torsemide. The patient reported adverse event (AE) after his first Pfizer-Biontech covid19 vaccine at 15:10  on 22Jan2021. He reported arm pain starting 3 hours after vaccination until noon the next day (23Jan2021). When he woke up on 23Jan2021 he reported lower back pain, that has migrated more to the right hip and into the glute. The pain inhibits walking, standing, etc. He did note that he is >300lbs and has had joint pain in the past, but the hip pain is new. He also thought it might be kidney pain, as he takes a daily diuretic. He stated he has been treating with Aleve twice a day, but that walking is still very bad.  The patient is an optometrist that was calling about the Covid-19 vaccine and said that he did not know if the Lot number written on the vaccination card is EL3302, E13302, or EI3302. He got the vaccine on 22Jan2021 and reported that he got a sore arm about 3 hours after receiving the injection. He woke up with a sore lower back pain. He is 5ft 9.5 and 310 lbs and he is on Torsemide, a pretty strong diuretic. He woke up with the back pain and stated that it moved right and middle to his buttocks, a little lower than the end of his spine and to the right. He did not think it was his kidneys. He said that Torsemide can make kidneys work overtime. His knees were pretty shot, the left worse than the right. No further details provided. He was upset to know that he has shrunk a 1.5 inches over the years. He has been taking 2 Aleve a day since Saturday, this morning was his 4th pill. He said that it is really odd when he stands equally on both feet his lower back hurts. He has to sleep on his right side and that it hurts more when he sleeps on his back and on his left side. He was fearful doing eye exams next to his patient and how the lower back pain would affect him.  Reporter considered seriousness for Lower back pain was Medically significant. The outcome of event lower back pain was not recovered; of event arm pain was recovered on 23Jan2021; of other events was unknown.; Sender's Comments: Based on the time association, the possible contribution of suspect vaccine BNT162B2 to the event low back pain cannot be excluded. The ongoing gout and concomitant drug torsemide may also play contributory roles to the event. The impact of this report on the benefit/risk profile of the Pfizer product is evaluated as part of Pfizer procedures for safety evaluation, including the review and analysis of aggregate data for adverse events. Any safety concern identified as part of this review, as well as any appropriate action in response, will be promptly notified to Regulatory Authorities, Ethics Committees and Investigators, as appropriate.