Back pain (a thousand times worse)/severe pain/Pain starting on back and wrapping around; Couldn't hardly move; Couldn't hardly take a breath; It's hurting down into her stomach.; This is a spontaneous report from a contactable consumer. A 66-year-old female patient received second dose of bnt162b2 (PFIZER-BIONTECH COVID-19 VACCINE, solution for injection, Batch/lot number: unknown and Expire Date: unknown) via unspecified route of administration, on 22Apr2021 as single dose, for covid-19 immunisation. Medical history of patient included Type 2 diabetic and small herniated disc. Concomitant product included medicine for diabetes (Not specified). Patient received first dose of vaccination on 01Apr2021 at the age of 66 years. There was no family medical history. The patient had no prior vaccinations (within 4 weeks). The patient experienced Back pain (a thousand times worse)/severe pain/Pain starting on back and wrapping around, couldn't hardly move, Couldn't hardly take a breath and It's hurting down into her stomach on Apr2021. The reporter was calling on behalf of sister in law. Prior to receiving vaccine had already experienced back pain. The patient received first vaccine dose on 01Apr2022, back pain felt was different than previous pain. Patient received second dose on 22Apr2021 and back pain was described as "a thousand times worse". Reporter learned of this information approximately 01May2021. Her sister in law got the vaccine because she stays with her wife and her wife just had triple bypass. So she signed her sister-in-law up and got her the vaccine and she and her wife had already had the vaccine and they did not have any issues. Prior to her sister in law getting the vaccine she had a little bit of a back issue which they knew was a small herniated disc. She had some issues off and on. The patient got the second booster and from there it was down hill. It was like it amplified a thousand times. She thinks it's a side effect or some type of combination between the vaccine. Somehow the vaccine has done something, but she can't figure out what. She knows it has done something to cause her immune system to make it worse. She thinks it was initiated by the vaccine. She states hopefully this does not impact her job at all. She does not think it will, but she is concerned for her sister-in-law. The vaccine seems to correlate with the back pain. She didn't say anything until probably the second week or so after she got the second one. The first, she was kind of like, I think it's doing something, but she wasn't sure. Then when she got the second one, it amplified it and then she was like yeah, it's got something to do with it. It's bad. She states her sister-in-law is a very strong lady. This morning she went in to see her and she couldn't even hardly move or take a breath. She's trying to move around. She wants to know if this is going to effect her job. She states the pain is starting in the back and wrapping all the way around. It's hurting down into her stomach. The events were persisting and she's not sure how much worse it can get. Her doctor suggested that she get it. She feels bad now because she kind of talked her into getting it as well because she is a type 2 diabetic. Her diabetes is controlled with medicine. She had a test prior to vaccine about the back problem.  She has a very high pain tolerance. She was now hurting to a point where she is about ready to go to the emergency room. There was no previous immunization with the Pfizer vaccine considered and no vaccines administered on same date of the Pfizer suspect. The patient had no relevant tests. There was no investigation assessment. The outcome of the events was not recovered.   Information on the lot/batch number has been requested.