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 78 year-old female patient received bnt162b2 (COMIRNATY), administered in arm left, administration date 16Nov2021 (Lot number: 83203OBD) at the age of 78 years as dose 3 (booster), single for covid-19 immunisation. Relevant medical history included: "Known allergies: Penicillin" (unspecified if ongoing); "Cold" (unspecified if ongoing). Concomitant medication(s) included: Z-PAK taken for cough; PREDNISONE; SHINGRIX. Vaccination history included: Bnt162b2 (Dose 1, Lot No: EL9669, Anatomical Location: Arm left), administration date: 03Feb2021, when the patient was 77 years old, for Covid-19 immunization; Bnt162b2 (Dose 2, Lot No: EN6203, Anatomical Location: Arm left), administration date: 25Feb2021, when the patient was 77 years old, for Covid-19 immunization. The following information was reported: IMMUNISATION (non-serious) with onset 16Nov2021, outcome "unknown", described as "Received Booster Dose"; PAIN IN EXTREMITY (non-serious) with onset 16Nov2021, outcome "not recovered", described as "Arm still sore"; CONTUSION (non-serious) with onset 16Nov2021, outcome "not recovered", described as "Kind of bruised". Relevant laboratory tests and procedures are available in the appropriate section.  Additional Information: It was reported that Received Booster Dose 16Nov2021. It was in the morning, all were in the early morning. Arm still sore. Kind of bruised. Not there all the time, only some times. Not real sore. Every now and then feels like I have a bruise. I don't have joint pain, at my age every once in awhile.  When I get out of bed like I had a shot.  Not real sore, bruise. Move my arm a certain way feels like a bruise.How long does it last? As long as it feels like a bruise it's ok?  "Some people got really sick with it, not with Pfizer but the other one." This is the only one. Prior Vaccinations (Within 4 weeks) included Shingles Vaccine (Manufacturer: UNKNOWN,Lot Number: UNKNOWN Route). Adverse events following prior vaccinations was reported as none. She has lost weight lately, she is about 125 pounds or maybe a little more Height: She was 5'2.5" and she might be that still but she is not sure. She provided that is seems like the soreness is always there. She kept thinking that it would go away because it always did but she still feels it every once in a while and that's why she was wondering if it was normal or if others have reported that. Confirmed that it began on 16Nov2021. Inquired for outcome and she provided that it never really bothers her that much so she would say that it has gotten better. When she first got the 3rd vaccine she felt it that day but other than that it got better from that. She always feels it and that's why she called to check and make sure that it is okay. She was on a medication that they had rescheduled her vaccine because of, it was an antibiotic, they wanted to make sure that it was out of her system. During the vaccine supplemental form caller provided that she had went to the doctor because she had a cold, she didn't have COVID, she was tested for that.The doctor gave her a Z-pack and something else for her allergies. This was all around the time of her last shot, the 3rd vaccine. She then went back and she got another Z-pack because she still had a cough and they gave her prednisone. The prednisone was just so many days and then when she went to get her vaccine they said to wait 2 weeks so they had rescheduled her. Additional Vaccines Administered on Same Date of the Pfizer Suspect was none. The Emergency Room and Physician Office was reported as no.  No follow-up attempts are possible. No further information is expected.