Received her Pfizer Covid Booster shot on 08Dec2021; Right arm injection site redness/her arm where she got the shot, in her muscle was red and hot; feeling sluggish and lazy/very sluggish; feeling sluggish and lazy with right arm injection site redness; feels the muscle is hot and warmer than normal; felt really drugged out/Went back to bed the following day around 930, and slept until 430 that afternoon; her arm where she got the shot, in her muscle was red and hot/arm was really hot; injection site is also itchy/had some itching right on her muscle where she got that shot; Under her right arm, down to her right breast she has gotten puffy/ On that same right arm on the underneath right side of her breast towards the back side of it, there is another swollen spot; Her arm ached like a tooth ache; under her right arm, down to her right breast she has gotten puffy and it hurts if you push on it/It hurts a little; Still doesn't feel good/feels worse currently; 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 89 year-old female patient received bnt162b2 (BNT162B2), administered in arm right, administration date 08Dec2021 14:30 (Lot number: EW0191) at the age of 89 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 (1st dose, lot number EL9262), administration date: 22Jan2021, when the patient was 88 years old, for COVID-19 immunization; Bnt162b2 (2nd dose, lot number EN6201), administration date: 15Feb2021, when the patient was 88 years old, for COVID-19 immunization. The following information was reported: IMMUNISATION (non-serious) with onset 08Dec2021 14:30, outcome "unknown", described as "Received her Pfizer Covid Booster shot on 08Dec2021"; VACCINATION SITE ERYTHEMA (non-serious) with onset 08Dec2021, outcome "recovering", described as "Right arm injection site redness/her arm where she got the shot, in her muscle was red and hot"; SLUGGISHNESS (non-serious) with onset 08Dec2021, outcome "recovering", described as "feeling sluggish and lazy/very sluggish"; LAZINESS (non-serious) with onset 08Dec2021, outcome "recovering", described as "feeling sluggish and lazy with right arm injection site redness"; MUSCULAR WEAKNESS (non-serious) with onset 08Dec2021, outcome "recovering", described as "feels the muscle is hot and warmer than normal"; VACCINATION SITE PRURITUS (non-serious) with onset Dec2021, outcome "recovering", described as "injection site is also itchy/had some itching right on her muscle where she got that shot"; SWELLING (non-serious) with onset Dec2021, outcome "unknown", described as "Under her right arm, down to her right breast she has gotten puffy/ On that same right arm on the underneath right side of her breast towards the back side of it, there is another swollen spot"; PAIN IN EXTREMITY (non-serious) with onset Dec2021, outcome "unknown", described as "Her arm ached like a tooth ache"; PAIN (non-serious) with onset Dec2021, outcome "unknown", described as "under her right arm, down to her right breast she has gotten puffy and it hurts if you push on it/It hurts a little"; FEELING ABNORMAL (non-serious) with onset Dec2021, outcome "not recovered", described as "Still doesn't feel good/feels worse currently"; SOMNOLENCE (non-serious) with onset 08Dec2021, outcome "unknown", described as "felt really drugged out/Went back to bed the following day around 930, and slept until 430 that afternoon"; FEELING HOT (non-serious) with onset 08Dec2021, outcome "unknown", described as "her arm where she got the shot, in her muscle was red and hot/arm was really hot".  Additional information: The patient got the Pfizer COVID 19 booster last Wednesday, 08Dec2021. By the time she got home her arm where she got the shot, in her muscle was red and hot. It stayed that way. Her arm was really hot. In fact her arm was still warmer than normal. Her arm was getting better. She also had some itching right on her muscle where she got that shot. She was a little better but not much. This was happening in the same arm that the shot was given in. On that same right arm on the underneath right side of her breast towards the back side of it, there was another swollen spot. She thinks it is just drainage or something. It hurts a little, but it was manageable. The arm issue was still going on as of today Monday 13Dec2021. It has almost been a full 7 days. Her arm was just now starting to cool down.  Follow-up attempts are completed. No further information is expected. No follow-up attempts are possible. No further information is expected.