booster dose: usual pain at the site of injection; booster shot: very tired, real lethargic; booster dose: aches, felt like she was hit by a bus; booster dose: wasn''t very hungry; booster dose: red patch on her arm, maybe 3-4 inches below the injection site; arms were aching/legs were aching; real lethargic; She touched the spot and it was very hot; This is a spontaneous report received from a contactable reporter(s) (Consumer or other non-HCP). The reporter is the patient.  A 78-years-old female patient received bnt162b2 (BNT162B2), administered in arm left, administration date 30Sep2021 (Batch/Lot number: unknown) at the age of 78 years as dose 3 (booster), single for covid-19 immunisation. The patient's relevant medical history was not reported. There were no concomitant medications. Vaccination history included: Bnt162b2 (Dose: 2nd, Lot Number / Expiry Date:EN6201/ Unknown, Route, Anatomical Location:  Left arm, first and second dose: a little bit tired), administration date: 25Feb2021, when the patient was 77 years old, for Covid-19 immunization, reaction(s): "a little bit tired"; Bnt162b2 (Dose: 1st, Lot Number / Expiry Date: EN5318/ Unknown, Route, Anatomical Location:  Left arm, first and second dose: a little bit tired), administration date: 04Feb2021, when the patient was 77 years old, for Covid-19 immunization, reaction(s): "a little bit tired". The following information was reported: VACCINATION SITE PAIN (non-serious) with onset 2021, outcome "unknown", described as "booster dose: usual pain at the site of injection"; FATIGUE (non-serious) with onset 2021, outcome "unknown", described as "booster shot: very tired, real lethargic"; PAIN (non-serious) with onset 2021, outcome "unknown", described as "booster dose: aches, felt like she was hit by a bus"; DECREASED APPETITE (non-serious) with onset 2021, outcome "unknown", described as "booster dose: wasn''t very hungry"; VACCINATION SITE ERYTHEMA (non-serious) with onset 2021, outcome "unknown", described as "booster dose: red patch on her arm, maybe 3-4 inches below the injection site"; PAIN IN EXTREMITY (non-serious) with onset 2021, outcome "unknown", described as "arms were aching/legs were aching"; LETHARGY (non-serious) with onset 2021, outcome "unknown", described as "real lethargic"; FEELING HOT (non-serious) with onset 2021, outcome "unknown", described as "She touched the spot and it was very hot". Relevant laboratory tests and procedures are available in the appropriate section.  Additional Information: The caller was calling in regards to the Pfizer booster shot. When probed to determine what the booster shot was for, she responds that she was 78 and she already had her first 2 shots back in Feb, so she went to her local (Withheld) drug store and both her and her husband got their booster shots. She is calling because she figured Pfizer needed to know the side effects people get. She figured that's how Pfizer gets their data. She states it's not a real serious situation, she had no effect on the first and second one, but the booster dose kind of affected her. She stated with the booster shot, she had the usual pain at the site of injection. She also was very tired. She states she was sitting on the sofa watching tv and fell asleep a couple of times. She was real lethargic. She aches. She felt like she was hit by a bus, she states her legs were aching, her arms were aching. Then, she wasn't very hungry. She was given some paperwork and she read that and she was okay. She confirmed her booster shot was last Thursday, 30Sep2021. She stated yesterday morning, she happened to look in the mirror and noticed a red patch on her arm, maybe 3-4 inches below the injection site. She touched the spot and it was very hot. She thought there was an infection there or that she got bitten by a bug, but there was no indication of that. She was very concerned especially because it was way down her arm, no where near where the needle was injected. She put ice on it, and then thought maybe she wasn't supposed to put ice on it. She called her cousin, whose son is an RN, and her cousin informed her there was such a thing as COVID arm and showed her pictures and reports of people having these patches on their arm and it goes away. She clarifies her cousin sent her different pictures of arms with all these red spots from after taking the vaccine. The caller was told it wasn't serious and it was nothing to worry about and that it should go away. She confirms the red patch on her arm is fading today. The patch is still there, but it is fading. It's less than it was yesterday. The area is still hot, but it's smaller. She states 7 days prior to the getting her booster shot, clarified as 24Sep2021, she did have to get a CT scan at the hospital. She was injected in the same arm (left arm), clarified in the vein at the elbow, with the contrast they do for a CT scan. She wonders if it has anything to with her symptoms. No additional Vaccines were administered on Same Date of the Pfizer Suspect If applicable, list all vaccines administered on same date with the Pfizer vaccine considered as suspect. Prior Vaccinations (within 4 weeks) If applicable, list any other vaccinations within four weeks prior to the first administration date of the suspect vaccines: None.  No follow-up attempts are possible. No further information is expected.