This is a spontaneous report from a Pfizer sponsored program COVAX US Support. A contactable consumer (patient) reported that a 23-year-old female patient received BNT162B2 (PFIZER-BIONTECH COVID-19 mRNA VACCINE; Formulation: Solution for injection, Lot Number: EN6208, NDC number and Expiry Date: Unknown), via an unspecified route of administration in the arm left on 07Jul2021 at 14:07 (at the age of 23-year-old), as a dose 1, single for COVID-19 immunisation. The patient had just terrified of COVID the new strain and everything with having had it and she also heard if you have long-haul Covid then supposedly the vaccine can help take some of the symptoms away or make you feel better, but mostly the preventative of getting it again. The patient medical history included that she had COVID on an unspecified date in Oct2020, She started getting joint pain almost like when she had Covid and she had leg tremors during COVID. Concomitant medication included Tetanus Bundle (formulation: Injection; Manufacture and lot Number was Unknown) administered in Left arm, dose 1, single on 22Jul2021, which was received within 4 weeks prior to the first administration date of the suspect vaccine. The patient visited to physician Office last Thursday when she got the Tetanus shot, it was like a physical. It was reported that the patient felt that her heart was racing on the first dose which was given on 07Jul2021, and she felt like her heart was racing or a fast heartbeat when it was given to her. She reported when she got the first one she didn't feel good, it almost felt like a slight version of Covid again, then her heart out of no where started racing and pounding, so she went to the emergency room and it eventually slowed down, but it was really scary honestly. She was just asking if she should take the second one, which was scheduled on 28Jul2021 and what would happen if she doesn't take the second one. Would she be able to get it at a further date. On 07Jul2021, the patient reported that it started immediately after getting the shot, she was kind of nauseous and dizzy, then when she got home ,she still felt kind of weird, not anything to rush about, it wasn't a horrible reaction, she just felt weird. She started getting joint pain almost like when she had Covid, her bones felt tight. She reports a few days later, that next Sunday, that she was just laying in bed and her heart started racing like crazy out of nowhere, it was really scary, and she had leg tremors, she had that during COVID, just uncontrollable shaking. The patient was confirmed that she received the vaccine on 07Jul2021. She confirmed all symptoms began the same day 07Jul2021. The patient stated that she was still having a little bit of joint pain, she guessed it could be from that. Confirmed it's ongoing, it's better than it was when she first got it. Confirms it has improved. She reports she got COVID in October 2020 and she's had the long-haul COVID up until just a few months ago, and now she's starting to feel better. She reported that she was feeling pretty much better now in that sense, long haul Covid symptoms are still slightly there. The patient visited to emergency room for all the reported events and was not hospitalized. The outcome of the events Heart racing, Fast Heartbeat, she didn't feel good, it almost felt like a slight version of Covid again, nauseous, dizzy, Feeling abnormal, Shaking was recovered on an unknown date in Jul2021 and other events of joint pain, her bones felt tight, COVID-19 was recovering.