DVT; arm pain in the right arm that went into the shoulder area; chills; blood clot; This is a spontaneous report received from a contactable reporter(s) (Consumer or other non HCP) from medical information team, Program ID: (159558). The reporter is the patient.  A 60-year-old male patient received BNT162b2 (BNT162B2), in 2021 as dose 1, single (Batch/Lot number: unknown), in left arm for covid-19 immunisation. The patient's relevant medical history included: "he wasn't feeling good and and shoveling snow", start date: Feb2021 (unspecified if ongoing); "He was have chest pain", start date: Feb2021 (unspecified if ongoing); "They ran a number of tests and while in the hospital received an IV line in his right arm", start date: Feb2021 (unspecified if ongoing), notes: He has a family history of health disease and his wife told him to go to the ER. They ran a number of tests and while in the hospital received an IV line in his right arm. The patient's concomitant medications were not reported. The following information was reported: DEEP VEIN THROMBOSIS (medically significant) with onset Mar2021, outcome "recovered", described as "DVT"; PAIN (non-serious) with onset 2021, outcome "unknown", described as "arm pain in the right arm that went into the shoulder area"; THROMBOSIS (medically significant) with onset 2021, outcome "recovered", described as "blood clot"; CHILLS (non-serious) with onset 2021, outcome "unknown". The events "blood clot", "dvt", "arm pain in the right arm that went into the shoulder area" and "chills" required physician office visit. The patient underwent the following laboratory tests and procedures: Blood test: Unknown Results, notes: they did blood work and made sure there was no family history. Hematologist thought clot was from IV,; I had a test done: Blood clot, notes: I had a test done and they found DVT blood clot; Ultrasound scan: no new clots, notes: He got an ultrasound and its a little black and blue. He was told that the veins might have been redirected but the ultrasound was the same, a little scar tissue but no new clots, all stable. Therapeutic measures were taken as a result of thrombosis, deep vein thrombosis.  Clinical course: Last February he went to the hospital- he wasn't feeling good and shoveling snow. He was having chest pain and not feeling very good.  He has a family history of health disease and his wife told him to go to the ER. They ran a number of tests and while in the hospital received an IV line in his right arm. The next day after being released he received his first dose of the Pfizer BioNTech Covid 19 vaccine. Initially he had no symptoms other than chills maybe. He received the vaccine in his left dose because he had the IV line in the right arm at it was bruised. A week or so later he developed arm pain in the right arm that went into the shoulder area- not the same side as the vaccine.  He went to the doctor and it was found that he had a blood clot. He was prescribed Eliquis for the DVT.  The doctor said he's healthy for 60 and they did blood work and made sure there was no family history.  Hematologist thought clot was from IV, he said its rare but it can happen. He no longer has a clot and he is on a lower dose of Eliquis. Things are stable, things are good. He has since then got a second dose and booster, all three of his Covid vaccines have been Pfizer. He states he is all in on booster and vaccines are great. He had a little arm pain with all three Pfizer Covid shots. He hasn't gotten the second booster yet though because he still has some nerve pain in his right shoulder from the DVT. He was told to stop using that arm and to use the other one. For the past year he's been doing physical therapy doing upper body/ chest exercises and the elliptical bike to get blood flow to that right arm. He got an ultrasound and its a little black and blue.He was told that the veins might have been redirected but the ultrasound was the same, a little scar tissue but no new clots, all stable. Went to the doctor's a few day ago and the assistant did ask him if they every figured out the cause of that blood clot?  He knows there's been some rare reports with J&J and Moderna but he didn't mention Pfizer. Are blood clots a side effect that's been reported with the Pfizer vaccine?  Is there anything to differentiate between a DVT from a vaccine versus a regular DVT.I do have a Caller on the other line he is a consumer or a patient. He is reporting this, when he got his first vaccine shot, the COVID-19 vaccine (Pfizer COVID-19 vaccine) dose, so two weeks after that he had a blood clot." Consumer was informed about the Role of Pfizer drug Safety When paraphrased the concern: Consumer stated, "That is correct, that's kind of one of the question I had, so what happened last February of last year I went to the emergency room. I wasn't feeling really good (event captured conservatively). So, I spent the night and I had some test done and I had an IV (unspecified medication), I had the vaccine scheduled and that's when I asked (Name withheld) if it was difficult to get this, he said no, definitely get the vaccine, it's really important. So I went to get the vaccine next day, than a week or two weeks later, I started feeling some arm pain and I had a test done and they found DVT blood clot and so they put me on Eliquis (treatment) and the good news is (incomplete sentence) and they put me on Eliquis then for the DVT." When probed to clarify medication name: Consumer stated, "So, what happened I had the IV (Unspecified Medication) and then I had the vaccine the next day. I didn't had any reaction, just the kind of, I had the chills, that kind of stuff. But nothing real bothersome and then I went in about 2 weeks later they did a test and then they found the DVT and then so the Hematologist and he said you know for (incomplete sentence), I was 60 (years) at that time at that time, he said you have pretty good health for 60 (years). He said we don't normal see DVTs in someone a patient like you. He told me that they got the budget and he told me that the DVT came from the IV and that was last March and then I didn't really asked about it but then but couple of weeks ago on my primary, just for follow up and he said, what was the cause of the DVT, and I said they think it is an IV but you know it was interesting, I did have the vaccine, the next day, you know the ER and blah, you got it. So I insist can I know it, and I know about the J&J but I am not sure if you had any other, you know any experience with the people with the DVT or the blood clot with the Pfizer? The good news is I am better and Eliquis has been taken, everything stable, so that is all. I don't know if it's anything else how I need to treat it differently or is it any other (incomplete sentence)."Consumer was informed about the role of Pfizer Medical information department and Pfizer drug safety department.  No follow-up attempts are possible; information about lot/batch number cannot be obtained. No further information is expected.