shaking all over; shiver; I got the booster shot Friday; I got the booster shot Friday; arm was kinda sore; This is a spontaneous report from a contactable consumer or other non-health care professional (patient). A 80-years-old male patient received third dose of bnt162b2 (PFIZER-BIONTECH COVID-19 mRNA VACCINE; formulation: Solution for injection, Lot Number: FD 0808), via an unspecified route of administration on 08Oct2021 11:19 (at the age of: 80-years-old) as dose 3 (booster), single for covid-19 immunisation. The patient medical history was not reported. The patient received concomitant medication with unknown medicines. The patient previously received first and second dose of bnt162b2 (PFIZER-BIONTECH COVID-19 mRNA VACCINE; formulation: Solution for injection, Batch/Lot Number: UNKNOWN), via an unspecified route of administration on an unspecified date in Feb 2021 and Mar2021 (at the age of: 80-years-old) as dose 1, single and dose 2, single for covid-19 immunisation. The patient also previously received flu shot (FLU VACCINE VII), via an unspecified route of administration on an unspecified date for immunization (No reaction on previous exposure to vaccine). On 08Oct2021 11:19 on Friday he got the booster shot. On 09Oct2021 04:00 the patient had shaking all over and shivers. On an unspecified date in Oct2021 patient also had arm was kinda sore. It was reported that Patient stated he got the booster shot on Friday 08Oct2021 11:19, his other two shots was first one in Feb2021 second in Mar2021 and this one Friday. he don't remember if he ever got a reaction from the first two shots. he just had a slight reaction it was about 4 o'clock in the morning the next day, he had a little bit during the day after the shot, of course his arm was kinda sore, but that was normal because that happens and then at 4 o'clock in the morning he got up he had chills and a little bit of shaking all over and couldn't stop shaking, but that only lasted for a half hour and then he was fine. he feel okay, it may have been a reaction to the booster shot. About 5o'clock it was fine and he went about his business. he feel good, he feel fine. He was just wondering if it was a reaction to the booster. he was up at the store yesterday, and got to talking to one of the ladies one of the checkers she said after second shot of the Pfizer she had the same reaction, she was shaking all over and it went away like mine. He didn't have any thing, he went to for Pfizer vaccine. his arm feels so much better, because they told to him that the shoulder where your shot was it would last a couple days and go away and it did. He forgot to tell that, when he spoke to his pharmacist she said none of the medications that he was taking would interfere with the shot. he think it could have been one of the medicines. he takes 4 different medications. he don't get a reaction from the flu shot. patient states that he has been trying to get a hold of the doctor today but can't get a hold of him probably because of the Holiday. The clinical outcome of the events shaking all over was recovered on 09Oct2021, shiver was recovered on an unspecified date in 2021 and outcome of arm was kinda sore was unknown.  Follow-up attempts are completed. No further information is expected.