there's a feeling of painful pressure under my arm.; Left armpit and left side pain, feels like a bruise, comes and goes.; Left armpit and left side pain, feels like a bruise, comes and goes.; sore bruise feeling; Booster; This is a spontaneous report received from a contactable reporter(s) (Consumer or other non HCP). The reporter is the patient.  A 47 year-old female patient (not pregnant) received bnt162b2 (BNT162B2), intramuscular, administered in arm left, administration date 09Oct2021 09:30 (Lot number: FF2590) at the age of 47 years as dose 3 (booster), single for covid-19 immunisation. Relevant medical history included: "Hashimoto's thyroiditis" (unspecified if ongoing); "GERD" (unspecified if ongoing); "acetabular labral tears" (unspecified if ongoing); "uterine fibroids" (unspecified if ongoing); "endometriosis" (unspecified if ongoing); "ovarian cyst" (unspecified if ongoing); "exercise-induced reactive airway" (unspecified if ongoing); "hx of MVA/concussion" (unspecified if ongoing), notes: other medical history: hx of MVA/concussion; "known allergies: PCN" (unspecified if ongoing), notes: known allergies: PCN; "IV CT contrast" (unspecified if ongoing), notes: known allergies:IV CT contrast; "latex" (unspecified if ongoing), notes: known allergies: latex; "adhesives" (unspecified if ongoing), notes: known allergies: adhesives; "cocoa butter" (unspecified if ongoing), notes: known allergies: cocoa butter; "prior rt arm injuries " (unspecified if ongoing), notes: prior rt arm injuries . Concomitant medication(s) included: FLU taken for immunisation; SYNTHROID; FAMOTIDINE; FISH OIL; VITAMIN D3. Past drug history included: Sporanox, reaction(s): "known allergies"; Celebrex, reaction(s): "known allergies"; Macrobid, reaction(s): "known allergies". Vaccination history included: Bnt162b2 (prev dose product=COVID 19, prev dose brand=Pfizer, prev dose brand unknown=False, prev dose lot number=ER8734, prev dose lot unknown=False, prev dose administrator route=, Intramuscular, prev dose administration date=, 09Apr2021, prev dose administration time=11:45 AM, prev dose number=2), administration date: 09Apr2021, when the patient was 47 years old, for COVID-19 immunization, reaction(s): "Left armpit and left side pain, feels like a bruise, comes and goes. At first I thought it'd go away after a few days, as it went away after my 1nd and 2nd doses.", "Left armpit and left side pain, feels like a bruise, comes and goes. At first I thought it'd go away after a few days, as it went away after my 1nd and 2nd doses.", "Left armpit and left side pain, feels like a bruise, comes and goes. At first I thought it'd go away after a few days, as it went away after my 1nd and 2nd doses."; Bnt162b2 (prev dose product=COVID 19, prev dose brand=Pfizer, prev dose brand unknown=False, prev dose lot number=ER6208, prev dose lot unknown=False, prev dose administrator route=, Intramuscular, prev dose administration date=, 19Mar2021, prev dose administration time=11:30AM, prev dose number=1), administration date: 19Mar2021, when the patient was 46 years old, for Covid-19 Immunization, reaction(s): "Left armpit and left side pain, feels like a bruise, comes and goes. At first I thought it'd go away after a few days, as it went away after my 1nd and 2nd doses", "Left armpit and left side pain, feels like a bruise, comes and goes. At first I thought it'd go away after a few days, as it went away after my 1nd and 2nd doses", "Left armpit and left side pain, feels like a bruise, comes and goes. At first I thought it'd go away after a few days, as it went away after my 1nd and 2nd doses". The following information was reported: IMMUNISATION (disability) with onset 09Oct2021 09:30, outcome "unknown", described as "Booster"; PAIN IN EXTREMITY (disability) with onset 10Oct2021, outcome "not recovered", described as "there's a feeling of painful pressure under my arm."; AXILLARY PAIN (disability), PAIN (disability) all with onset 10Oct2021, outcome "not recovered" and all described as "Left armpit and left side pain, feels like a bruise, comes and goes."; CONTUSION (disability) with onset 10Oct2021, outcome "not recovered", described as "sore bruise feeling". Therapeutic measures were not taken as a result of, pain in extremity, axillary pain, pain, contusion. She wonder if Adverse events going to be permanent so she checked "disability or permanent damage" in the list. She was not disabled but she can't rest her arm against her side without a sore bruise feeling. It's not enough to stop her activities of daily living, but it's enough to be conscious of most of the time. she did get her flu shot in the left arm exactly 3 weeks after her 3rd covid shot, on a day that she thought her armpit pain might have resolved. she don't think the pain is from the flu shot--it's totally different. No Covid-19 prior vaccination and did not tested covid after vaccination.