palpitations; She would occasionally have a flutter/fluttering; This is a spontaneous report from a contactable consumer (patient). A 71-year-old female patient received BNT162B2 (PFIZER-BIONTECH COVID-19 mRNA VACCINE, Solution for injection, Lot Number: EN6202, Expiration date not reported) via an unspecified route of administration in left arm on 26Feb2021 at 13:00 (71-year-old female at vaccination) as dose 1, single for COVID-19 immunization. The patient medical history included palpitations (history of heart palpitations). There were no concomitant medications. Vaccination facility type was reported as Pharmacy/Drug Store. The patient had no history of all previous immunization with the Pfizer vaccine considered as suspect. The patient was not administered with any other additional vaccines on same date of the Pfizer vaccine. Prior vaccination (within 4 weeks), the patient had not received any other medications. The patient got the first vaccine and within one hour (on 26Feb2021) she started to get palpitations or fluttering. They weren't horrendous, they didn't take her breath away or anything. It continued through most of the day. It was not debilitating, and it did not take her breath away. It was bothersome. The palpitations came back for her periodically. She would occasionally have a flutter. She did not say too much but going towards the evening her husband told her he was having palpitations also. Her husband got them too but his were much milder and only lasted a few hours. His went away and didn't come back. Mine lasted until that night and they still come back every now and then even now. On 01Mar she saw her health care provider. It was recommended that she wear a heart monitor. She got the heart monitor on 04Mar2021. She took it back on 05Mar2021. She does not have any results to provide. But she did not hear from them yet. She queried that how prevalent was the palpitations. She had atrial fibrillation and had a history of heart palpitations here and there. She had not had any for a long time. She had not felt in palpitations in 3-4 years. It was controlled. She asked hcp (PA) if this was going to interfere with her getting the second dose. She told me no, she needed to get the second dose. She asked whether she should get the second dose. She queried if she would get palpitations with second dose. She knew this was not necessarily a normal thing. She was unable to see her regular provider and saw a physician assistant. He was who recommended the heart monitor. She had regular labs and the doctor kept pretty good tabs on her. The physician assistant said by all meant to get the second dose. She stated that her weight was too much. When the heart palpitations faded, she thought it was over. They started back the next day. She and her husband both had the same Lot number. She and her husband didn't talk about the palpitations. It was mentioned later that night. No investigation assessment was reported. The adverse event heart palpitation/fluttering resulted the patient to visit physician office. The outcome of the event palpitation was recovering and the outcome of other event as unknown.  No follow-up attempts are possible. No further information was expected.; Sender's Comments: Linked Report(s) : US-PFIZER INC-2021263735 same reporter/drug/AE, different patient