Pain in his entire body was so intense; Weakness in his legs; feels like it's almost like a spasm when he first stands in the morning; tug on the muscles; had to use the walker for almost 15 days; Could not walk; This is a spontaneous report received from a contactable reporter(s) (Consumer or other non HCP). The reporter is the patient.  A 71 year-old male patient received bnt162b2 (BNT162B2), administration date 15Apr2021 (Lot number: ER8731, Expiration Date: 31Jul2021) at the age of 71 years as dose 2, single for covid-19 immunisation. Relevant medical history included: "blood pressure", start date: 1997 (unspecified if ongoing), notes: States he has been taking the same blood pressure medications since around 1997; "spring allergies" (unspecified if ongoing), notes: spring allergies. The patient took concomitant medications. Vaccination history included: Bnt162b2 (Dose: 1, Lot number; ER8730, Time the Vaccination Was Given: 11:00, Anatomical location: left shoulder), administration date: 26Mar2021, when the patient was 71 years old, for COVID-19 immunization, reaction(s): "slight headache", "could not walk". The following information was reported: GAIT INABILITY (non-serious) with onset Apr2021, outcome "recovered" (05May2021), described as "Could not walk"; PAIN (non-serious) with onset 17Apr2021, outcome "recovered" (05May2021), described as "Pain in his entire body was so intense"; MUSCULAR WEAKNESS (non-serious) with onset Apr2021, outcome "not recovered", described as "Weakness in his legs"; MUSCLE SPASMS (non-serious) with onset Apr2021, outcome "not recovered", described as "feels like it's almost like a spasm when he first stands in the morning"; MUSCLE STRAIN (non-serious) with onset Apr2021, outcome "recovering", described as "tug on the muscles"; WALKING AID USER (non-serious) with onset Apr2021, outcome "recovered" (05May2021), described as "had to use the walker for almost 15 days". Therapeutic measures were taken as a result of gait inability, pain, muscular weakness, muscle spasms, muscle strain.  Additional Information: The patient had the 2nd dose of the vaccine and by the morning of the 3rd day after his 2nd dose, he could not walk and by the 5th day after the 2nd dose, he was walking with a walker; he crawled around the house on his hands and knees. The reason he could not walk was due to the pain in his entire body was so intense and he could not move by the 4th day after the 2nd dose of the vaccine and he was able to get from room to room by using a walker and had to use the walker for almost 15 days because the pain was just too intense and nothing helped the pain. The pain lasted for almost about 05May2021 before he could walk without a walker or cane or the pain subsided. The patient went to get his patient card and was out of breath. The patient stated that for the medications he took that did not work by helping the pain, he usually takes Aleve when it was needed, not very often if something goes wrong and he takes Aleve 1/2 a pill and did have Vicoden left from some dental work he had done much much earlier and nothing touched the pain; for any medication he took that did not help the pain, he had no dosages, lots, expiry dates or NDC numbers to provide as that information was not with him at this time and he did know the dosage of the Aleve was 200mg and he usually did things as directed pretty much but the Aleve did not help at all; stated that for the Aleve it directed not to take more than 3 in a 24 hour period but he took three at a time because it hurt and did not help at all and did not touch the pain. The pain began on 17Apr2021 and was not ongoing as much but the weakness in his legs was still there and felt like it's almost like a spasm when he first stands in the morning and was not like a pain but a tug on the muscles and this was much improved. No additional Vaccines Administered on Same Date of the Pfizer Suspect. The patient kept thinking he would be alright tomorrow and kept thinking that and no visit to Emergency Room or Physician Office. The patient did his annual check up in Oct2021 and there was nothing out of the ordinary and it was his regular visit and he has not had illness but was just waiting for spring allergies to go away. The patient had been taking the same blood pressure medications since around 1997 and did not provide further information. He did not talk clearly without his teeth. No Prior Vaccinations (within 4 weeks).  Follow-up attempts are completed. No further information is expected.