Polymyalgia rheumatica, or PMR; This is a spontaneous report received from contactable reporter (Consumer) from medical information team for a Pfizer sponsored program. The reporter is the patient. Other Case identifier(s): US-PFIZER INC-202101843166.  A 73-year-old male patient received bnt162b2 (BNT162B2), via an unspecified route of administration, administered in arm (reported as "right arm" and "left arm"), administration date 11Mar2021 (Lot number: EL6208) at the age of 72 years as dose 2, single for covid-19 immunisation. The patient's relevant medical history was not reported. Concomitant medications included: WARFARIN and patient was taking a whole bunch of medications. Vaccination history included: Bnt162b2 (Dose: 1, Lot: EL9266, Arm (reported as "right arm" and "left arm")), administration date: 11Feb2021, when the patient was 72 years old, for Covid-19 immunization; Flu vaccine (he's been receiving the Flu shot for 40 years and never had any side effects), reaction(s): "never had any side effects". The following information was reported: POLYMYALGIA RHEUMATICA (medically significant) with onset Apr2021, outcome "unknown", described as "Polymyalgia rheumatica, or PMR". The event "polymyalgia rheumatica, or pmr" was evaluated at the physician office visit. The patient underwent the following laboratory tests and procedures: blood test: unknown results, notes: I might have taken the blood test. I am not sure after that. Therapeutic measures were taken as a result of polymyalgia rheumatica. The patient got his first and second dose at a hospital on 11Feb2021 and 11Mar2021, respectively. Sometime in Apr2021, the patient received some side effects regards with the vaccine. He had tightness in top of thighs and back. It was hard to move fast and then the pain started. It went to his shoulders and then he could not lift his arms above his shoulders in the morning. As day goes by, he would be able to move them more. He mentioned that in his leg he felt some pain. He was then diagnosed with Polymyalgia rheumatica, or PMR.  He checked it out and it says it can come from vaccines. He is not saying it was the Pfizer vaccine though, but in case it did, he would like to know if he can get the booster. He's been receiving the Flu shot for 40 years and never had any side effects. He also mentioned not to be sure about this was caused by the Pfizer Biontech COVID 19 vaccine but that he found online that PMR might be caused by any COVID 19 vaccine.  He is also bothered, or he is also worried to get the booster shot because he is planning to get the booster shot. So, he is kind of worried because he might experience another side effect. The patient was trying to find out if somebody can tell him whether he should get the booster shot or not because he had side effect apparently from the second vaccine shot and he is trying to find if someone can give him that. When probed for anatomical site of injection, the patient stated, "I think both on the right arm". When probed for lab test, the patient state "no, I would not have been because I might have taken the blood test. I am not sure after that". He was 72 when he got the shots and when the pain started, he turned 73. When providing his height, he said he is shrinking a little bit.  It was before the vaccines and he said it is from old age. His rheumatologist was at the same hospital as his primary care. He went to his PCP and he said to check again, and she said she did not know what to tell him about the booster dose. He believed both doses were given in the left arm. He's be taking prednisone since diagnosed and warfarin for many years now. He asked his Rheumatologist if it was safe to receive the booster dose of the Pfizer Biontech COVID 19 vaccine while taking these medications. HCP did not have any information about it.