Dizziness issues and her dizziness sometimes debilitating the point she has to use the walker; Dizziness issues and her dizziness sometimes debilitating the point she has to use the walker; Balance issues; Somedays she is barely able to walk and other day she can't walk; Nausea; Diarrhea; This is a spontaneous report received from a contactable reporter(s) (Consumer or other non HCP).  A 66-year-old female patient received BNT162b2 (BNT162B2), on 11Jan2022 as dose 3 (booster), single (Lot number: FF2590) at the age of 65 years for covid-19 immunisation. The patient's relevant medical history included: "Cholesterol" (ongoing), notes: Cholesterol. Concomitant medication(s) included: ATORVASTATIN taken for blood cholesterol. Vaccination history included: BNT162b2 (DOSE 1, SINGLE, Date: 04Mar2021, LOT#: EN6199), administration date: 04Mar2021, when the patient was 64-year-old, for COVID-19 immunization; BNT162b2 (DOSE 2, SINGLE, Date: 30Mar2021, LOT#: ER8733), administration date: 30Mar2021, when the patient was 64-year-old, for COVID-19 immunization. The following information was reported: DIZZINESS (non-serious), WALKING AID USER (non-serious), outcome "unknown" and all described as "Dizziness issues and her dizziness sometimes debilitating the point she has to use the walker"; BALANCE DISORDER (non-serious), outcome "unknown", described as "Balance issues"; GAIT DISTURBANCE (non-serious), outcome "unknown", described as "Somedays she is barely able to walk and other day she can't walk"; NAUSEA (non-serious), outcome "unknown"; DIARRHOEA (non-serious), outcome "unknown", described as "Diarrhea". The events "dizziness issues and her dizziness sometimes debilitating the point she has to use the walker" and "balance issues" required physician office visit. Relevant laboratory tests and procedures are available in the appropriate section. Therapeutic measures were not taken as a result of dizziness, walking aid user, balance disorder, gait disturbance, nausea, diarrhoea.  Additional Information: Concern: Reporter stated, "My wife Withheld and I both were received the initial two Pfizer shots like a year and a half ago and then we were both booster glass spring and shortly after my wife got the booster, she started having dizziness issues and her dizziness sometimes debilitating the point she has to use the walker and we got numerous, we have been to the higher state university the Withheld, the vaccination center at Withheld where we saw a Neurologist, a ear nose and throat specialist for balance, an eye specialists, thinking that may be a part of her dizziness and nobody was able to help us so then our family Physician send us to the Withheld it's near in withheld where we saw a brain surgeon again and a Neurologist, they after clean they could find nothing wrong with my wife and had no idea other than it could possibly be the Booster side effect of the vaccine, so we have been doing physical therapy which says to just, my wife is working with a lady and she is working on her Vestibular system which just part of ear and in brain I guess, trying to correct her balance but we didn't know, we just felt like we need too report this because none of the Doctors, none of the tests that we have taken to find any reason at all for here balance issues. We both got the Booster shots. Concern was paraphrased. Reporter stated, "Somedays she is barely able to walk and other day she can't walk she also has nausea and sometimes she has diarrhea also." Reporter was informed about the role of Pfizer Drug Safety. Lab Work: Reporter stated, "Not the last two but we had extensive blood work done at withheld states at the withheld in the Vaccination Center, not the last two weeks, no." Facility Details: Name: Reporter stated, "Withheld." Mailing Address and Telephone#: Reporter stated, "Well, I don't see the address of the facility right here." Treatment: Reporter stated, "No."