sore arm; This is a spontaneous report received from contactable reporter(s) (Consumer or other non-HCP). The reporter is the patient.  A 78-year-old female patient received bnt162b2 (BNT162B2), administered in arm left, administration date 04Oct2021 (Lot number: 301556A) at the age of 78 years as dose 3, (booster), single for covid-19 immunisation. Relevant medical history included: "Breast cancer" (unspecified if ongoing); "Asthma" (unspecified if ongoing); "drug sensitive" (unspecified if ongoing), notes: drug sensitive; "she had Covid", start date: 2020 (unspecified if ongoing), notes: she had Covid; "brain fog", start date: Feb2020 (unspecified if ongoing), notes: brain fog; "osteoporosis" (unspecified if ongoing). Family history included: "asthma" (unspecified if ongoing). Concomitant medication(s) included: PRADAXA taken for blood disorder; METOPROLOL TARTRATE taken for heart rate irregular; SINGULAIR taken for asthma; ADVAIR; REMERON taken for sleep disorder; TAMOXIFEN taken for neoplasm malignant; FLUTICASONE; PROLIA taken for osteoporosis. Vaccination history included: Bnt162b2 (Dose: 1, LOT: EL9261, Route, Anatomical Location: left arm, below the shoulder), administration date: 24Jan2021, when the patient was 77 years old, for COVID-19 Immunization; Bnt162b2 (Dose: 2, LOT: EN6701 or EN6201, Route, Anatomical Location: left arm, below the shoulder), administration date: 15Feb2021, when the patient was 77 years old, for COVID-19 Immunization. The following information was reported: PAIN IN EXTREMITY (non-serious) with onset 04Oct2021, outcome "recovered" (05Oct2021), described as "sore arm".  Additional Information: Additional Context: Reporter states she had the fourth vaccine, the booster, last Thursday and she is very drug sensitive. When she had the third one, she had similar side effects but it wasn't that terrible. Her husband had it and nothing happened to him. She had night sweats and just had the chills. She woke up for 3 and a half, our days, ringing out wet hair and her sheets. She was just concerned about the chills and the shaking. Clarified that the vaccine, booster being referred to is the Pfizer Covid vaccine booster. Reporter states she is going to call him next and find out why she has been having this. She had these night sweats for so long and she had breast cancer and is also taking Tomaxafin. She is just wondering if that might have something to do with this. She has been getting tender breasts and has been taking this medication for a year and hasn't had that before. She states that if someone is going to get something, it is going to be her. She is so drug sensitive. Event Details: Night sweats, chills, shaking: Reporter states she had her booster Thursday and states they started that night. She had the shot at 10 in the morning, or so. About 9:00pm that night, she just started with severe shaking. She went to bed that night and when she woke up, her hair was all wet, as well as her sheets. Today is the first day it has gotten better. She still has the night sweats but the chills have gotten better. Reporter states that Thursday night, Friday and Saturday, she had these symptoms. Last night, she had the sweats but they were not as severe as the night before. Treatment Not received, because of the severe shaking and muscles and bones hurting, she took 2 Tylenol. She states she is very careful and took just 2 extra strength Tylenol, only on that Thursday night. Clarified she is not experiencing the muscle and bones hurting anymore. Reporter states she is just old and is just loaded with those darn pills. She knows they are for her health. She knows that beginning of 2020 all of this came down and she had Covid. The only thing she didn't have was the taste and smell. Clarified that she had Covid prior to getting the Covid vaccines. Tamoxifen: Reporter states this is her cancer medication that she will have to take for 5 years. Clarified that she thinks this might have been the Tamoxifen because, her breasts were feeling sore and states this medication is hormonal and stops the hormones. Reporter states she started taking it one year ago. Clarified she is taking the generic medication, the Tamoxifen. Reporter states it is a hormone receptor. Reporter states there are 2 other medications she takes at night. She knows that it had to do with Covid. That is when she started taking most of this stuff. She states she has brain fog too which she has had since she got it in Feb2020. She was ill and in bed for 3 weeks and was on nebulizers. Clarified she was referring to when she actually had Covid and not regarding the Covid vaccine. Tests: Reporter states she has to take Prolia every 6 months for osteoporosis. She just had it a few months ago and has had no problems at all. Reporter states she wants to be careful because she is so weak. Adverse Event: night sweats, chills, severe shaking. Time of Onset: 9:00pm, 31Mar2022. Additional Information: Prior Vaccinations (within 4 weeks): No. She does not think so. Reporter states that she got the Prolia right before that but has not received anything else. AE(s) following prior vaccinations: She states that the third shot was pretty bad. She didn't have sweats but it was pretty bad and only lasted a day. She just had a sore arm. Clarified that she was referring to the third Covid shot. No Family Medical History Relevant to AE(s): There are only allergies and asthma.  If follow-up activities cannot be or are not conducted: No follow-up attempts are possible; information about lot/batch number cannot be obtained.