Lower Back, Spine and Rib Cage Pain; lost weight because tired and hardly sleep; Lower Back, Spine and Rib Cage Pain; Lower Back, Spine and Rib Cage Pain; lost weight because tired and hardly sleep; lost weight because tired and hardly sleep; This is a spontaneous report received from contactable reporter(s) (Consumer or other non HCP) from medical information team. The reporter is the patient.  A 81 year-old female patient received bnt162b2 (BNT162B2), administered in arm left, administration date 08Dec2021 12:30 (Batch/Lot number: unknown) at the age of 81 years as dose 3 (booster), single for covid-19 immunisation. Relevant medical history included: "High Blood Pressure" (ongoing); "Osteoarthritis" (ongoing); "Osteoporosis" (ongoing); "Osteopenia" (ongoing). Family history included: "Atrial Fibrillation" (unspecified if ongoing), notes: Sister in Law in (Withheld) when pandemic started Physician in (Withheld), doesn't remember if she took it or not, but she went to the hospital and within a week she died. Don't think she got the vaccine, very controlled Atrial Fibrillation. The patient's concomitant medications were not reported. Vaccination history included: Bnt162b2 (Dose: 01, Lot: EN6206), administration date: 03Mar2021, when the patient was 80 years old, for COVID-19 immunization; Bnt162b2 (Dose: 02, Lot: EN6201), administration date: 28Mar2021, when the patient was 80 years old, for COVID-19 immunization. The following information was reported: BACK PAIN (non-serious), SPINAL PAIN (non-serious), MUSCULOSKELETAL CHEST PAIN (non-serious) all with onset 08Dec2021, outcome "recovering" and all described as "Lower Back, Spine and Rib Cage Pain"; INSOMNIA (non-serious), WEIGHT DECREASED (non-serious), FATIGUE (non-serious) all with onset 08Dec2021, outcome "recovering" and all described as "lost weight because tired and hardly sleep". Relevant laboratory tests and procedures are available in the appropriate section.  Additional information: Caller stated she was calling about the Booster; verified Pfizer Covid Vaccine Booster. Caller stated she needs some information, she was 82 years old, and she had her 3 doses, the first 2 were no problem, but the booster, she has been suffering since, for 3 months already. Caller stated what happened when they administered the Booster was they kept her at (Withheld) for the 15-20 minutes to see if there were any reactions, well 8-10 minutes later she felt, after they administered it, she felt pain going into her rib cage, back and neck. Caller stated she told the nurse, and the nurse said it was her lymph nodes and that was normal. Caller stated she has been suffering with back aches that travel to her rib cage since. Caller stated she doesn't know what to do. What was the difference between the first two and the booster. Caller stated she was so sorry she took it. Caller stated anything Osteo she has, Osteoporosis, Osteoarthritis, Osteopenia, so she may be fighting it, but it was already in her body. Caller stated the pain was in her lower back and it travels to her rib cage. Caller stated she didn't have it before. Caller stated she has lost weight because she was tired and can hardly sleep because of the pain. Caller stated it was difficult to concentrate on sleeping. Caller stated maybe it was like a venom and there is an antidote. Caller stated that was a bad example. Treatment included home Remedies and Teas. Booster Dose: Lot: FH8077 or FH8027. The time of onset of AE: 8-10 Minutes after Vaccine. No prior Vaccinations within 4 weeks. No AE(s) following prior vaccinations.   The lot number for bnt162b2 was not provided and will be requested during follow up.