A even more rapid and pronounced pounding in my chest and ears, accompanied by cold air in the center of my chest; A even more rapid and pronounced pounding in my chest and ears, accompanied by cold air in the center of my chest; A even more rapid and pronounced pounding in my chest and ears, accompanied by cold air in the center of my chest; My heart rate which was normally mid 60's/minute would suddenly become 80-100/minute; Shortness of breath; Periodic dizziness; Also I began having a consistently harder & harder time climbing the 17 stairs to my condo without stopping for a break; This is a spontaneous report received from contactable reporter(s) (Consumer or other non HCP). The reporter is the patient.  A 73-year-old female patient received BNT162b2 (BNT162B2), on 15Apr2022 as dose 4 (booster), single (Lot number: FJ5682) at the age of 72 years for covid-19 immunisation. The patient's relevant medical history and concomitant medications were not reported. Vaccination history included: BNT162b2 (DOSE 1, SINGLE, Lot number: EL9269), administration date: 13Feb2021, when the patient was 71-year-old, for COVID-19 immunization; BNT162b2 (DOSE 2, SINGLE, Lot number: EN6198), administration date: 06Mar2021, when the patient was 71-year-old, for COVID-19 immunization, reaction(s): "following my second initial COVID shot, I have developed atrial fib and have been put on Eliquis", "Rapid, thumping pulse in the back of my neck at the base of the skull", "Alternating episodes of rapid heartbeat in my chest and throat that were so strong, I felt them without using my hand or an instrument", "A lump in my left breast that was the shape and size of a new erase on a #2 pencil. Even though it had gone away before the scan, the local breast center said it probably was a result of my second COVID shot"; BNT162b2 (DOSE 3 (BOOSTER), SINGLE, Lot number: FE3590), administration date: 04Oct2021, when the patient was 72-year-old, for COVID-19 immunization, reaction(s): "By early 2022, the thumping pulse in the back of my neck became less and less frequent". The following information was reported: PALPITATIONS (non-serious), TINNITUS (non-serious), CHEST DISCOMFORT (non-serious) all with onset 2022, outcome "unknown" and all described as "A even more rapid and pronounced pounding in my chest and ears, accompanied by cold air in the center of my chest"; ASTHENIA (non-serious) with onset 2022, outcome "unknown", described as "Also I began having a consistently harder & harder time climbing the 17 stairs to my condo without stopping for a break"; HEART RATE INCREASED (non-serious) with onset 2022, outcome "unknown", described as "My heart rate which was normally mid 60's/minute would suddenly become 80-100/minute"; DIZZINESS (non-serious) with onset 2022, outcome "unknown", described as "Periodic dizziness"; DYSPNOEA (non-serious) with onset 2022, outcome "unknown", described as "Shortness of breath". Relevant laboratory tests and procedures are available in the appropriate section. Additional information: By mid-fall 2022 after taking both boosters, patient's symptoms changed to an even more rapid and pronounced pounding in chest and ears, accompanied by cold air in the center of chest. The patient's heart rate which was normally mid 60's/minute suddenly become 80-100/minute. Patient had periodic dizziness and shortness of breath, but it was not constant. The only consistent trigger was drinking ice water. Also, patient began having a consistently harder and harder time climbing the 17 stairs to condo without stopping for a break. For the last 20 plus years, patient had never even been winded when rapidly climbing them. At this point, patient had to lie down afterwards.; Sender's Comments: Linked Report(s) : US-PFIZER INC-202300122458 same patient and different drug dose/events;