this morning when he got out of bed he did not think his left leg would hold him up; muscles and pain in the thigh/muscle pain/pain basically operates on the muscles of his thigh; terrific pain that came and went in his left thigh, up in his back and down in his left leg; He could hardly walk and has been taking Ibuprofen to help him walk; terrific pain that came and went in his left thigh, up in his back and down in his left leg; minor arthritis; This is a spontaneous report from a contactable consumer (patient).   An 81-year-old male patient received the second dose of BNT162B2 (PFIZER-BIONTECH COVID-19 VACCINE, Solution for injection, lot number: unknown, expiry date: unknown) via an unspecified route of administration at injection left shoulder (arm), up high almost where arm met body on outside on 31Mar2021  (at the age of 81-year-old) as dose 2, single as COVID-19 immunization. The patient medical history included blood clot back in 1970s (there was just normal medications that he has been on for years), coughed (1.5 years ago he had a session where he coughed for 6 weeks, he never coughed anything up), pains all over that just moved around, mainly in his side and back, short of breath, Embedded IUD, heart stopped, passed out and fallen. He was on his third IUD (lot number and expiry date: unknown). The patient's concomitant medications were not reported. Historical vaccine included the first dose of BNT162B2 (PFIZER-BIONTECH COVID-19 VACCINE, Solution for injection, Lot number was not reported), via an unspecified route of administration on an unknown date in 2021 (might be 2 weeks before second dose) as dose 1, single for covid-19 immunisation. Past drug included Pradaxa for 35 months (then he got done with that and then got a device that looks like a toy parachute in his right aorta flap in there to prevent blood clots for him to get off of Coumadin) and Coumadin for blood clots (Lots number and Expiry dates were unknown). His first device was put in in the state of withheld There were two ladies that went up there to the hospital and they backed out and it was a study. They later called patient's wife to know. how he was doing and then one of them had it done afterwards. They said he actually died in the woods before he got the IUD or Device; that his heart stopped completely, not a heart attack, his heart just stopped. A guy picked him up because he had fallen into a campfire. The guy picked him up, lifted him about as high as a table to get him out of the fire and dropped him to the ground and they thought that was what started his heart back. When he came out of that he had passed out and it sounded like someone was calling his name from way far away where he could barely hear he until it got louder and louder and he came around thinking what the he was doing down there. On an unknown date approximately in Apr2021, maybe 4 to 5 days or almost a week after he was administered second dose of Pfizer Covid-19 Vaccination could had been 04Apr2021 or 05Apr2021, the patient experienced terrific pain that came and went in his left thigh, up in his back and down in his left leg, this morning when he got out of bed he did not think his left leg would hold him up, muscles and pain in the thigh/muscle pain/pain basically operates on the muscles of his thigh and he can hardly walk. It was reported that his right leg was not bothered. It felt like the pain basically operated on the muscles of his thigh, but he did not really know what was in there. He mentioned the shots themselves were nothing. 10 minutes after he had the shots of Pfizer Covid-19 Vaccination doses he did not even know he had them. Outcome was unknown, some days side effects were better than other days but the severity he did not think has changed even over several weeks. This morning when he got out of bed he did not think his left leg would hold him up. He was not sure if he had not had the bed stand to put his hand on when he stood up for a second he was not sure his left leg would have held. He has not been hospitalized or been to the emergency room relative to this event. He has been to his healthcare provider's office multiple times relative to this event. The first two times he told the provider about it and she just hoo-hooed it off. Then he went in to see the provider again and she felt his leg and sent him packing. He could hardly walk and has been taking Ibuprofen to help him walk. Regarding relevant testing/investigations/x-rays/scans/cultures/bloodwork/lab: he has had X-rays might be about a month ago of his groin and leg areas; where they had him lay on his back, pulled his parts up, dropped his legs out like a chicken to see his bones and everything but they only thing they found was something like minor arthritis, not due to Pfizer Covid-19 Vaccination or the side effects; but just minimal everything, minimal wear for his age, like wear and tear; that everything looked good in there. The patient underwent lab tests and procedures which included x-rayed chest and heart: unknown, he got an IUD or intrauterine device almost 20 years ago so they wanted to check that and X-ray: minor arthritis unspecified date in 2021. The outcome of the event this morning when he got out of bed he did not think his left leg would hold him up was unknown and the outcome of rest of the events was not recovered.  reinforced and referenced: "Because these reactions are reported voluntarily, it is not always possible to reliably estimate their frequency or establish a causal relationship to vaccine exposure."  The lot number for the vaccine, [BNT162B2], was not provided and will be requested during follow up.