feels like heartburn; felt his heart beating faster; heart beat skipping; weird feeling in his chest; muscle pain; headache; his arm was hurting in where he received the injection, in his left arm; This is a spontaneous report from a contactable consumer or other non-healthcare professional (patient) reported for himself and via Pfizer sponsored Program. A 64-year-old male patient received bnt162b2 (PFIZER-BIONTECH COVID-19 mRNA VACCINE, Formulation: Solution for injection, Batch/Lot Number: RW0202), dose 1 via an unspecified route of administration, administered in Arm Left on 03Jun2021 (at the age of 64-year-old) as dose 1, single for COVID-19 immunisation. Medical history included ongoing diabetes mellitus, weight decreased from an unknown date and unknown if ongoing he has recently lost some weight due to diet and exercise. Relevant Tests was none. This was prior to receiving the Covid 19 vaccine. No investigation assessment was reported. There were no concomitant medications. Report is related to a study or programme. History of all previous immunization with the Pfizer vaccine considered as suspect (or patient age at first and subsequent immunizations if dates of birth or immunizations are not available) was none. The patient did not receive any other vaccines within 4 weeks prior to the COVID vaccine. Additional vaccines administered on same date of the Pfizer suspect was none. Adverse events following prior vaccinations was none. The patient experienced muscle pain, headache, feels like heartburn, felt his heart beating faster, heartbeat skipping, weird feeling in his chest on 10Jun2021. His arm was hurting in where he received the injection, in his left arm on an unspecified date in Jun2021. It was reported that, caller received his first Pfizer Covid 19 Vaccine on 03June2021. On today 10June2021 caller has experienced increased heart rate, skipping sensation with heart, muscle pain, headache, and pain in his arm at the beginning of the call but reported to (withheld) that the pain had went away prior to ending call with her. Caller asking if the reactions are because of the vaccine and his history with diabetes. Caller on the line who received their first dose of the Covid-19 vaccine on 03Jun2021. The caller had a reaction. He felt his heart beating faster and he experienced his heartbeat skipping, he mentioned it does not hurt. The caller was worried, this was weird for him. He also was having some headaches, muscle pain and his arm started hurting again and added that his arm was hurting in where he received the injection, in his left arm. he was diabetic and he was asking was his reaction because of his diabetes. Is that causing his reaction. He mentioned he has recently lost some weight due to diet and exercise. This was prior to receiving the Covid 19 vaccine. He has this weird feeling in his chest, it feels like heartburn. Then it feels like his heartbeat is skipping, then it stops, then it starts again, then it stops. He reported his heart just skipped while on the phone call. He says it was scary. He was having no pain in his arm now. He did have some arm pain while talking to the agent from Pfizer, but it was not hurting now. It was ok right this second. He reported his symptoms began today. He was hesitant to get the Covid 19 vaccine. He was scheduled for his second dose on 24Jun2021. No product quality complaint was reported. Received first COVID-19 vaccine on 03Jun2021, started having adverse event on 10Jun2021. Adverse events did not require a visit to emergency room or physician office. It was reported that the outcome of headache and myalgia was unknown and outcome of the event his arm was hurting in where he received the injection, in his left arm was reported as recovered on 10Jun2021 and all other events were not recovered.  Follow-up attempts are completed. No further information is expected.