arm soreness and swelling; arm soreness and swelling; Pfizer-BioNTech Covid19 Booster Dose; tenderness at the injection site; foggy brain; difficulty in focus; 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 63 year-old female patient received bnt162b2 (BNT162B2), administered in arm left, administration date 18Nov2021 (Lot number: 463527) at the age of 63 years as dose 3 (booster), single for covid-19 immunisation. The patient had no relevant medical history. There were no concomitant medications. Vaccination history included: Bnt162b2 (First dose; Lot: ER8727; Exp: Unknown; NDC :Unknown), administration date: 25Mar2021, when the patient was 63 years old, for COVID-19 immunisation, reaction(s): "soreness in the arm", "headache"; Bnt162b2 (Second dose; Lot: EW0151), administration date: 15Apr2021, when the patient was 63 years old, for COVID-19 immunisation, reaction(s): "soreness in the arm", "headache". The following information was reported: IMMUNISATION (non-serious) with onset 18Nov2021, outcome "unknown", described as "Pfizer-BioNTech Covid19 Booster Dose"; PAIN IN EXTREMITY (non-serious) with onset 19Nov2021 08:00, outcome "not recovered", PERIPHERAL SWELLING (non-serious) with onset 19Nov2021 08:00, outcome "recovered" and all described as "arm soreness and swelling"; VACCINATION SITE PAIN (non-serious) with onset 2021, outcome "not recovered", described as "tenderness at the injection site"; FEELING ABNORMAL (non-serious) with onset 2021, outcome "unknown", described as "foggy brain"; DISTURBANCE IN ATTENTION (non-serious) with onset 2021, outcome "unknown", described as "difficulty in focus".  Additional information: Patient wants to know if this was a side effects and when will it go away? Patient was also wants to know about the possible side effects of the booster dose, like having memory loss or dementia. Per Patient she read in the CDC website that booster dose may cause memory loss and she's concerned about that. The Patient states she was reading the booster dose Pfizer Unknown Vaccine causes dementia and all this mess. The Patient reports she has side effects from the booster dose made by Pfizer and does not know how to explain what feeling exactly. The (with held) at the CDC called it foggy brain. The Patient states she does not know what was wrong with herself. Side effects from booster dose, not sure how to explain what was the feeling exactly: The Patient stated she has been looking on the internet about foggy brain. When the Patient sees this stuff, Patient stated something was happening to Patient which the Patient did not have. The Patient states she was going to call Pfizer back after she sees what the CDC says. Patient states no one seems to care and someone was going to tell the Patient what was going on. Patient states she was going to call Pfizer back and disconnects the call abruptly. Yes there was a Product Complaint. Patient reports she has side effects from the booster dose made by Pfizer's company, Pfizer Unknown Vaccine, and did not know how to explain what feeling exactly. The Patient states she was reading the booster dose Pfizer Unknown Vaccine causes dementia and all this mess. Patient declined to provide complete the report about additional lot numbers. No details about patient history, investigation assessment and other products provided. Report 1 of 2 Patient on the line calling about Comirnaty, the Covid 19 booster Vaccination. She has some concerns about it. She was trying to understand what was going on, what she believes has happened, has to go back in mind to what it was at this point. Patient stated on 18Nov2021 her and daughter got the booster for Covid, the Pfizer, administered at withheld. Patient explained they both, her and her daughter, received both of the covid shots and had soreness in the arm and stuff, had things like headache. This was after the first two shots. Patient explained everyone she knows had sore arm, especially the way the stick the needle deep in there, like seeing all on tv. No other details provide regarding these other individuals. Patient mentioned to focus on her. She was concerned because both her and her daughter went in, and after the booster had side effect of soreness under the arm, and swelling. The under arm being swollen did not happen for the first two shots. When probed for details she stated, she stated the swelling was has gone away, but she still has some tenderness. Some of it was at the injection site, shoulder arm part where the injection was administered. She called the pharmacist the following day and was informed it's a side effect. She was told normal lymph nodes could be swollen, but she did not have this on shot one and two. Patient confirmed the other two doses received were the Pfizer Covid-19 Vaccine. Comirnaty, Pfizer Covid-19 Vaccine- Administered on 18Nov2021 Product details in formal field Patient commented she thought the covid booster, the one her and daughter received something was wrong with it. Time received: It's not written, her memory was sort of shot, cannot really remember. Stated it was maybe 2PM or 3PM. She stated she called withheld this morning. She was afraid to look into events, she was afraid if she saw something she may find out something was wrong. Stated cannot take it back after getting the vaccine. What's happening continued to bother her. She was informed this was a normal side effect, but she was already fuzzy, and could not think clear. She spoke with other individuals with withheld too. She also contacted the CDC to see if this has been reported and was informed to complete VAERS form. They took down the information and everything. She still wants to know if this was a side effect, if so does it go away, and was there a medication to take. She also mentioned while looking things up and while waiting for covid 19 vaccination online something came up about Pfizer. Some were reports show they knew this shot could be subject to Lou Garret's Disease, Alzheimer, and Dementia. No additional vaccines administered on same date of the Pfizer suspect. No any AE(s) require a visit to Emergency Room, Physician Office. No prior vaccinations (within 4 weeks) provided. AE(s) following prior vaccinations: After the first two Pfizer Covid-19 Vaccinations had soreness in the arm and stuff, had things like headache. No patient's medical history (including any illness at time of vaccination) and relevant tests provided. Follow-up attempts are completed. No further information is expected.; Sender's Comments: Linked Report(s) : US-PFIZER INC-202101782395 same vaccine, different patient and AE.;US-PFIZER INC-202101782206 same vaccine, different patient and AE