Within a few days of receiving the second COVID vaccine,  I developed severe back pain, shooting down my leg and calf.  I went from walking 5 miles a day to being unable to walk. I was bent over in pa; Within a few days of receiving the second COVID vaccine,  I developed severe back pain, shooting down my leg and calf.  I went from walking 5 miles a day to being unable to walk. I was bent over in pa; Within a few days of receiving the second COVID vaccine,  I developed severe back pain, shooting down my leg and calf.  I went from walking 5 miles a day to being unable to walk. I was bent over in pa; Within a few days of receiving the second COVID vaccine,  I developed severe back pain, shooting down my leg and calf.  I went from walking 5 miles a day to being unable to walk. I was bent over in pa; Within a few days of receiving the second COVID vaccine,  I developed severe back pain, shooting down my leg and calf.  I went from walking 5 miles a day to being unable to walk. I was bent over in pa; Within a few days of receiving the second COVID vaccine,  I developed severe back pain, shooting down my leg and calf.  I went from walking 5 miles a day to being unable to walk. I was bent over in pa; Within a few days of receiving the second COVID vaccine,  I developed severe back pain, shooting down my leg and calf.  I went from walking 5 miles a day to being unable to walk. I was bent over in pa; Within a few days of receiving the second COVID vaccine,  I developed severe back pain, shooting down my leg and calf.  I went from walking 5 miles a day to being unable to walk. I was bent over in pa; Within a few days of receiving the second COVID vaccine,  I developed severe back pain, shooting down my leg and calf.  I went from walking 5 miles a day to being unable to walk. I was bent over in pa; Within a few days of receiving the second COVID vaccine,  I developed severe back pain, shooting down my leg and calf.  I went from walking 5 miles a day to being unable to walk. I was bent over in pa; This is a spontaneous report received from a contactable other HCP. A 61-year-old female patient received bnt162b2 (BNT162B2, PFIZER-BIONTECH COVID-19 VACCINE, Formulation: Solution for injection, Batch/Lot Number: EL9261), dose 2 via an unspecified route of administration, administered in Arm Left on 04Feb2021 10:00 (at the age 61-year-old) as DOSE 2, SINGLE for covid-19 immunisation. Medical history included thyroiditis (Verbatim: Hoshimoto's Thyroiditis), food allergy known_allergies: Stadol, Demerol, fish. Concomitant medication(s) included levothyroxine sodium (THYROXINE) for an unspecified indication. The patient previously took stadol for drug hypersensitivity, demerol for drug hypersensitivity, bnt162b2 dose: 1 (Lot: EL3248) via unspecified route of administration, administered in left arm on 14Jan2021 at 10 AM for covid-19 immunisation. The patient did not receive any other vaccines within 4 weeks prior to the COVID vaccine. Prior to vaccination, the patient was not diagnosed with COVID-19. Since the vaccination, the patient has been tested for COVID-19. It was stated that "Within a few days of receiving the second COVID vaccine, I developed severe back pain, shooting down my leg and calf. I went from walking 5 miles a day to being unable to walk. I was bent over in pain. I spent three weeks being barely able to walk or stand and unable to leave my home. It was another three weeks before I could walk 1/2 mile comfortably. I had difficulty regulating heat and cold, had hyperhydrosis, decreased appetite and lethargy. My knee and calf were swollen and discolored. I went to the ER, Physical Therapy, and finally my MD, who said it was an inflammatory reaction to the vaccine. I still have some hip, leg, and back pain. I had x-rays to confirm it was not a musculoskeletal problem. I did not hurt my back. Pain medication did little to help. Until this time, I had never had an xray. Before this I was in exceptionally good health. I have finally returned to daily walking and yoga. I am a Registered Nurse with 40-year experience and a Doctorate", in Feb2021at 05:00 AM. The patient underwent lab tests and procedures which included sars-cov-2 test: negative on 10Feb2021, physiotherapy: unknown on an unspecified date (inflammatory reaction to the vaccine), x-ray: unknown on an unspecified date. Therapeutic measures were taken as a result of events. Outcome of the events was recovering.  Follow-Up (30JUN2021): Follow-up attempts are completed. No further information is expected.