sciatic nerve thing; Diarrhea; pain in her back; 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 58-year-old female patient received BNT162b2 (BNT162B2), on 06Jun2022 as dose 3 (booster), single (Lot number: FM7553) at the age of 58 years for covid-19 immunisation. The patient's relevant medical history included: "cholesterol" (unspecified if ongoing). Concomitant medication(s) included: ROSUVASTATIN taken for hypercholesterolaemia. Vaccination history included: coviD-19 vaccine (Dose: 1, she had Johnson & Johnson when they first came out because she is a teacher., Caller's first vaccine was Johnson & Johnson on 03Mar2021, LOT: 1805029; NDC/Expiry unknown.), administration date: 03Mar2021, when the patient was 57-year-old, for COVID-19 Immunization; coviD-19 vaccine (Dose: 2, She had the other two shots, Moderna was her first booster., Second vaccine: Moderna on 31Oct2021, LOT: 088D21A, NDC/Expiry unknown), administration date: 31Oct2021, when the patient was 57-year-old, for COVID-19 Immunization. The following information was reported: BACK PAIN (non-serious) with onset 09Jun2022 at 17:00, outcome "not recovered", described as "pain in her back"; DIARRHOEA (non-serious) with onset 12Jun2022, outcome "recovered", described as "Diarrhea"; SCIATIC NERVE NEUROPATHY (non-serious), outcome "unknown", described as "sciatic nerve thing". Therapeutic measures were taken as a result of back pain, sciatic nerve neuropathy.  Additional information: Caller received her booster dose of the Pfizer-Biontech Covid vaccine and would like to know if the pain in her back is a side effect. Caller mentioned reading on the internet that the vaccine might cause the inflammation to move to the spine. Caller said she thinks this seems related to the vaccine. Consumer that received Pfizer booster shot at (Facility withheld) on 06Jun2022, FM7553 for Covid-19, reporting on Thursday, 09Jun2022 she was walking on along the sea wall and got a pain in the middle of back and thought it was a sciatic nerve thing. She started to consider if she could make it back to her car, it hurt so much. A few days later, she had diarrhoea on Sunday and thought it was food poisoning because she had gone out to eat.Her back is still in pain, and now it's been fifteen days. She's had pain before but it never lasted more than a week. She is active, and this is not something that happens often. She is taking Tylenol, but doesn't know what it is. Is it the vaccine, could it be a side effect. She had the other two shots, Moderna was her first booster, and she had Johnson & Johnson when they first came out because she is a teacher. She went to her pharmacy for her booster and they said they only had Pfizer but that was ok. Pain in the middle of back: Started 09Jun2022 at 5:00 to 5:30 PM while walking along the sea wall, which she does daily. On her way back, about a quarter mile to her car, she got a sharp pain in her back and thought that was weird, but enough to question if she could make it to her car. It was excruciating for about 4 days. She put some muscle stuff on it that didn't work: Diclofenac Sodium Topical Gel: NDC: 69097-524-44, LOT number A1067 and expiration: Jan2023. It seemed like it got better. Sometimes she feels like she can't walk. She can move around and sometimes it's better but it's still there. It won't go away already. Just the Tylenol. She did have a bladder infection before the booster and informed the pharmacist that she was taking Cipro right now and asked if it was ok if she got the booster and pharmacist said yes. Ciprofloxacin 500mg: NDC/LOT unknown, it is in a pharmacy bottle. Expiration 31May2023. Dose is one tablet by mouth every 12 hours, but she took it every 24 hours