Dizzy; not so steady on her feet; Chills; wasn't feeling well; This is a spontaneous report received from contactable reporter(s) (Consumer or other non HCP). The reporter is the patient.  A 76 year-old female patient received bnt162b2 (BNT162B2), administered in arm left, administration date 03Apr2022 (Lot number: FJ9943) at the age of 76 years as dose 4 (booster), single for covid-19 immunisation. Relevant medical history included: "Blood pressure" (unspecified if ongoing). Concomitant medication(s) included: LOSARTAN taken for blood pressure measurement; NORVASC taken for blood pressure measurement. Vaccination history included: Bnt162b2 (Dose 1, Lot number: EN6208), administration date: 10Mar2021, when the patient was 75 years old, for Covid-19 Immunization, reaction(s): "Sore arm"; Bnt162b2 (Dose 2, Lot number: EW0150), administration date: 31Mar2021, when the patient was 75 years old, for Covid-19 Immunization, reaction(s): "Sore arm"; Bnt162b2 (Dose 3, Lot number: FD0809), administration date: 29Oct2021, when the patient was 76 years old, for Covid-19 Immunization, reaction(s): "Sore arm".   The following information was reported: CHILLS (non-serious) with onset 04Apr2022, outcome "recovered" (04Apr2022), described as "Chills"; DIZZINESS (non-serious) with onset 04Apr2022 07:30, outcome "recovered" (04Apr2022 07:30), described as "Dizzy"; MALAISE (non-serious) with onset 04Apr2022, outcome "unknown", described as "wasn't feeling well"; LIMB DISCOMFORT (non-serious) with onset 04Apr2022 07:30, outcome "recovered" (04Apr2022), described as "not so steady on her feet". Relevant laboratory tests and procedures are available in the appropriate section. Therapeutic measures were taken as a result of chills, dizziness, malaise, limb discomfort.  Additional information: Caller states she went yesterday to get her 4th booster for the BA5 and clarifies BA2 Variant. Caller states last night she had chills. She reports this morning she wasn't feeling well and thought she was coming down with COVID-19. Caller states she never had these side effects before except a sore arm that she has had before. She was concerned because she didn't want her husband to catch anything. Email Address: unknown; Caller states she will leave the report at her house address. She states she is sure Pfizer receives a few phone calls regarding this. Patient details: Caller states she thinks that she has shrunk. Caller states weight is unknown, but she is not big and fat. She states she tells the doctor she does not want to be weighed as she is not fooling with that. She states maybe 170 pounds. Caller states the phone broke up. Caller confirms the call is regarding the COVID-19 vaccine. Caller states a 4th dose is recommended for the new variant and clarifies the sub variant she thinks. Caller states her symptoms are not a big deal. HCP Details: Caller states she has Medicare. Caller declines consent for follow up with primary care physician since she states she will be okay. Caller states she was afraid she had caught COVID-19 but states she was told she didn't.  Chills: Caller states the chills began around 1:00 am today, 04Apr2022 and stopped after about 3 hrs. She states she put blankets on the bed and the chills stopped. Caller states after talking to the pharmacist she feels better now. The pharmacist told her 24-48 hours for her symptoms to resolve. Dizzy: Caller states when she got out of bed her head was spinning and she had to hold on to something because she didn't want to fall. Caller reports she woke up and got out of bed at 7:30am, 04Apr2022. Not steady on feet: Caller states she was not feeling good. She reports the not steady on her feet began at the same time as the dizziness at 7:30am, 04Apr2022. She states she took Tylenol and feels better now. She states her vaccination card is in her purse. Caller reports the pharmacy gave her some paperwork yesterday maybe her vaccination information will be there. She states the pharmacy gave her a lot of papers.  Dose: Caller states the vaccination took like 3 seconds in her left arm. Indication: She states she does not know if she is immune compromised, but she is old. She reports her granddaughter comes to her house and her granddaughter is not vaccinated. Caller states all her test results came back fine but she needs her physical this month. She reports that she hasn't had her physical since last year, but all her tests were fine last year. Caller declined to complete supplemental form as she states she has someone calling on the other line. No further details to provide. Description of Product Complaint: Description of complaint: She reports this morning she wasn't feeling well and thought she was coming down with COVID-19. She thought she may have got COVID-19 from the vaccine but the pharmacy told her she didn't catch COVID-19. Patient underwent lab test procedures which included: Investigation came back fine.  No follow-up attempts are possible. No further information is expected.