Third dose was on 28Aug. About 6 hours after the shot I started experiencing chest pain. Today is a week later and I continue to experience chest pain; cooling sensation in the chest/discomfort in the left chest area; irregular heart beat; Dose number 1 Administered on 15Feb021, Dose 2 on 28Aug021 and Dose 3 on 28Aug021; This is a spontaneous report received from contactable reporter(s) (Consumer or other non HCP). The reporter is the patient.  A 36 year-old female patient (not pregnant) received bnt162b2 (BNT162B2), administered in arm left, administration date 28Aug2021 10:30 (Lot number: FD8448) at the age of 36 years as dose 2, single and administration date 28Aug2021 (Batch/Lot number: unknown) as dose 3 (booster), single for covid-19 immunisation. Relevant medical history included: "Hashimoto" (unspecified if ongoing); "Hypothyroidism" (unspecified if ongoing); "Known allergy-Penicillin" (unspecified if ongoing). Concomitant medication(s) included: LEVOTHYROXINE. Vaccination history included: Bnt162b2 (Product: COVID 19, DOSE 1, SINGLE, brand=Pfizer, Lot number: FD8448, Lot unknown: False, Administration date=15Feb021, Administration time=10:30 AM, vaccine location: Left arm), administration date: 15Feb2021, when the patient was 35 years old, for Covid-19 immunization. The following information was reported: INAPPROPRIATE SCHEDULE OF PRODUCT ADMINISTRATION (non-serious) with onset 28Aug2021, outcome "unknown", described as "Dose number 1 Administered on 15Feb021, Dose 2 on 28Aug021 and Dose 3 on 28Aug021"; CHEST PAIN (non-serious) with onset 28Aug2021 16:00, outcome "not recovered", described as "Third dose was on 28Aug. About 6 hours after the shot I started experiencing chest pain. Today is a week later and I continue to experience chest pain"; CHEST DISCOMFORT (non-serious) with onset 28Aug2021 16:00, outcome "not recovered", described as "cooling sensation in the chest/discomfort in the left chest area"; HEART RATE IRREGULAR (non-serious) with onset 28Aug2021 16:00, outcome "not recovered", described as "irregular heart beat". The events "dose number 1 administered on 15feb021, dose 2 on 28aug021 and dose 3 on 28aug021", "third dose was on 28aug. about 6 hours after the shot i started experiencing chest pain. today is a week later and i continue to experience chest pain", "cooling sensation in the chest/discomfort in the left chest area" and "irregular heart beat" were evaluated at the physician office visit and emergency room visit. Therapeutic measures were not taken as a result of chest pain, chest discomfort, heart rate irregular. Additional Information: Covid vaccine details reported as, Product: COVID 19, Lot number: FD8448, Lot unknown: False, Administration date=28Aug021, Administration time=10:30 AM, Dose number:2, accine location: Left arm. Other vaccine same date details provided: Other vaccine same date product: Above shot on 28Aug, Other vaccine same date lot number: was my booster dose, Other vaccine same date vaccine date: 28Aug2021, Other vaccine same date dose number: 3, Facility type vaccine: Other. No other vaccine in four weeks. Received Levothyroxine medications in two weeks. Third dose was on 28Aug. About 6 hours after the shot I started experiencing chest pain. Today is a week later and I continue to experience chest pain, cooling sensation in the chest, irregular heartbeat, and discomfort in the left chest area. No treatment AE. No Covid prior vaccination. No Covid tested post vaccination.  Follow-up (14Oct2021): This follow-up is being submitted to notify that the lot/batch number is not available despite the follow-up attempts made. Follow-up attempts completed. No further information is expected.