pulmonary embolism; started clotting after the third shot; This is a spontaneous report received from contactable reporter(s) (Consumer or other non HCP) from medical information team, Program ID. The reporter is the patient.  A 63-year-old male patient received bnt162b2 (BNT162B2), on 21Dec2021 as dose 3 (booster), single (Lot number: 30125BA) at the age of 61 years intravenous, in left arm for covid-19 immunisation. The patient's relevant medical history included: "Hypothyroidism" (unspecified if ongoing), notes: Hypothyroidism diagnosed about 55 years ago; "serious breathing issue" (unspecified if ongoing), notes: very serious breathing issue after the first pulmonary embolism. Concomitant medication(s) included: LEVOTHYROXINE oral taken for hypothyroidism (ongoing); ELIQUIS. Vaccination history included: bnt162b2 (Pfizer covid19 vaccine first dose: 09Mar2021, Lot: EN6206, Expiration/NDC: unknown), administration date: 09Mar2021, when the patient was 60-year-old, for Covid-19 Immunization; bnt162b2 (Pfizer covid19 vaccine second dose: 12Apr2021, Lot: ER8734, Expiration/NDC: unknown), administration date: 12Apr2021, when the patient was 60-year-old, for Covid-19 Immunization. The following information was reported: PULMONARY EMBOLISM (medically significant), outcome "unknown"; THROMBOSIS (medically significant), outcome "unknown", described as "started clotting after the third shot". The events "pulmonary embolism" and "started clotting after the third shot" required physician office visit and emergency room visit. The patient underwent the following laboratory tests and procedures: Blood test: (unspecified date) unknown results, notes: He was tested for covid and they did a chest x-ray and a blood draw; Computerised tomogram: (unspecified date) unknown results, notes: They did CT chest scan when he went to the hospital and he was diagnosed with multiple pulmonary embolisms; Endocrine test: (unspecified date) unknown results, notes: I had multiple, multiple tests, that were expensive to insurance and I still have a balance on co-pays, cardiac tests, endocrine tests, pulmonary tests, neurological tests; Fibrin D dimer: (Mar2022) 2500, notes: He was told that his d dimers were 2500 and that he should go to emergency room immediately; cardiac tests: (unspecified date) unknown results, notes: I had multiple, multiple tests, that were expensive to insurance and I still have a balance on co-pays, cardiac tests, endocrine tests, pulmonary tests, neurological tests; Test: (unspecified date) unknown results, notes: I had multiple, multiple tests, that were expensive to insurance and I still have a balance on co-pays, cardiac tests, endocrine tests, pulmonary tests, neurological tests; Neurological examination: (unspecified date) unknown results, notes: I had multiple, multiple tests, that were expensive to insurance and I still have a balance on co-pays, cardiac tests, endocrine tests, pulmonary tests, neurological tests; Pulmonary function test: (unspecified date) unknown results, notes: I had multiple, multiple tests, that were expensive to insurance and I still have a balance on co-pays, cardiac tests, endocrine tests, pulmonary tests, neurological tests; SARS-CoV-2 test: (unspecified date) unknown results, notes: He was tested for covid and they did a chest x-ray and a blood draw; X-ray: (unspecified date) unknown results, notes: He was tested for covid and they did a chest x-ray and a blood draw.  Clinical course: The reporter states, "The pulmonary embolism, it was pretty significant in size. I was fine, then all of a sudden, I get these unprovoked blood clots, and my life has changed, for the first year and a half after my first rounds of Pulmonary Embolisms, I had multiple, multiple tests, that were expensive to insurance and I still have a balance on co-pays, cardiac tests, endocrine tests, pulmonary tests, neurological tests. They ran the gamut, after the first set of Pulmonary Embolisms they couldn't find a reason and the hematology they did their blood study and found no clinical reason or genetic history in my family. After 19  months, I am exhausted with the issues that revolve around this that occurred. I am feeling better than in the past 19 months, but still having issues. I never had these issues prior to the event and it's concerning. I was able to do things that I can't even think about doing, walking up and down my yard 5 times a day and cutting the grass. He sent an inquiry through the website and agent called him back. Reports he is having to take blood thinners now for the rest of his life after getting the Pfizer covid jabs, which were confirmed to be Pfizer covid 19 vaccines. At the age of 62, his blood started clotting after the third covid shot. He stopped taking the blood thinners and then in 20 days a new pulmonary embolism developed. Agent will send additional information. Agent addressed inquiry regarding side effects and referred to hcp. He is not sure exactly when he started taking blood thinner. He just knows he was not feeling well and it turned out his wife that is a RN told him he should get checked out. So he went to an express care through his insurance. He was tested for covid and they did a chest x-ray and a blood draw. He was told that his d dimers were 2500 and that he should go to emergency room immediately. This occurred in Mar2022. They did CT chest scan when he went to the hospital and he was diagnosed with multiple pulmonary embolisms. He was admitted to the hospital for about 3 days and states he was on an IV. He wants to explain the second time he was diagnosed with pulmonary embolism: He had to stop his blood thinner, Eliquis, three days before a procedure and they wanted him to come back in two weeks for a second procedure so clarifies he did not take the blood thinner for about 18 days when he ended up being diagnosed with pulmonary embolism for the second time. This one was a pain in his back that provoked him to go to the hospital. Confirms he was also admitted to the hospital this time. He was in the hospital for three days. What concerned him, the radiologist was very concerned since the size of the clot may have been causing too much back pressure on his heart and they were talking possible emergency surgery to remove the clot. Surgery did not have to be done. It must have been pretty big.