her back hurts; she can barely walk straight; still sick; This is a spontaneous report received from a contactable reporter(s) (Consumer or other non HCP) from medical information team. The reporter is the patient.  An 88-year-old female patient received BNT162b2, BNT162b2 omi ba.4-5 (BNT162B2, BNT162B2 OMI BA.4-5), on 24Oct2022 as dose 5 (booster), single (Batch/Lot number: unknown) at the age of 88 years, in right arm for covid-19 immunisation. The patient's relevant medical history was not reported. The patient took concomitant medications. Vaccination history included: Covid-19 vaccine (Primary Immunization series complete but unknown manufacturer), for COVID-19 immunization; Covid-19 vaccine (Dose: 3 (booster)), for COVID-19 immunization; Covid-19 vaccine (Dose: 4 (booster)), for COVID-19 immunization. The following information was reported: BACK PAIN (disability, medically significant) with onset Oct2022, outcome "unknown", described as "her back hurts"; GAIT DISTURBANCE (disability, medically significant) with onset Oct2022, outcome "unknown", described as "she can barely walk straight"; ILLNESS (non-serious) with onset Oct2022, outcome "unknown", described as "still sick". The events "her back hurts" and "she can barely walk straight" required emergency room visit. The patient underwent the following laboratory tests and procedures: Body height: 5'3'' or 5'4'', notes: she shrunk, that's how it is when someone gets old; Weight: 150 to 160 pounds, notes: last time she weighed 150 pounds. Therapeutic measures were taken as a result of back pain. Clinical course: Patient wants to know if pain the back is commonly report after receiving the Pfizer Booster shot. Patient stated that since the 24th when she received the shot her back hurts and she can barely walk straight. She stated: "I had to call (phone number withheld) and ran into the Hospital, but they did nothing for me. I just lay in bed, put ice on my back and heat on my back, but they did nothing for me." Patient continued: "They did nothing, they just told me what to do when I go back home, but I can't even walk straight because I have pain in my back." She also mentioned that she is laying in her bed, that it feels a little bit better and that she has been putting ice and heat on her back. Patient mentioned she currently does not have a Doctor. She also mentioned that she believes the medicine caused her pain, because she did not have a problem like this before. Furthermore, it was reported that she got a Covid booster shot and a couple days later she is still sick and laying in bed on her back. Her back, she cannot walk straight, she could hardly walk. She called (phone number withheld) and went to the hospital. She was told that it was her nerves and she forgot to tell them she had a covid shot. So they sent her back home. She confirms she was not admitted. She still couldn't walk straight, it is the pain in her back. She does not know if that is from the shot, but does not know what else it could be. Treatment: She put heat and ice on her back but nothing helped. She is laying in bed. She provided NDC from paperwork. NDC number of covid booster: 59267030402. She does not have her vaccine card handy to provide further details such as lot number and expiration date. She is laying down and vaccine card is downstairs. Pain is all over her back. She takes aspirin and. It does not go away. Clarifies it is not so bad when she takes aspirin. She takes a blood thinner that start with a L or an E.  The information on the batch/lot number for BNT162b2, BNT162b2 omi ba.4-5 has been requested and will be submitted if and when received.