suffered a seizure then cardiac arrest; Cardiac arrest; Nauseous; dizzy; will never play sports again; This is a spontaneous report from a contactable consumer (patient's mother). An adolescent male patient received bnt162b2 (PFIZER-BIONTECH COVID-19 mRNA VACCINE), via an unspecified route of administration on Jun2021 (Lot number was not reported) as dose 2, single for covid-19 immunisation. The patient had no prior health issues. He was an active athlete; worked out at the gym and had made the varsity football team prior to the events. The patient's concomitant medications were not reported. The reporter stated that her son, almost 16 years of age, received the Pfizer vaccine in May/Jun of 2021 - he received both doses through a pop-up event that the school district was offering. With his final dose being the first week of Jun2021, he did not have any initial side effects from the vaccine. Both she and her husband were also vaccinated, but they received Moderna. The patient was a healthy, active, loving boy who was loved by everyone. On 19Jul2021, upon arriving to a friend's house, patient suffered a seizure then cardiac arrest. He was resuscitated 3x prior to arriving at the hospital, after getting his pulse back. The house he was at was able to administer CPR (cardiopulmonary resuscitation). He was airlifted to a hospital where testing began to try to find out what happened. It was ruled his event was cardiac related, not neurological. Prior to the event he was nauseous, and dizzy in Jul2021. He was tested for myocarditis in 2021 which came back negative. A defibrillator was now in his chest, and the patient could never play sports again. Reporter stated for a 14-year-old, this was a huge hit mentally. As a parent, she worries for him, but she was grateful he was here. However, the time leading up to bringing him home was a nightmare for them emotionally, a mental pain no parent should go through, no child either. The reporter stated they still had no answers as to what caused their son's issues. They were in the process of genetic counseling which may present some answers although she was not hopeful on this. They have been working with the best of the best when it came to doctors for his ongoing treatment. She read so much about the effects of the vaccine, the nausea, the dizziness, the cardiac arrest. All signs point to that a child would have had chest pains, and that these symptoms occurred a certain amount of time after vaccination. The fact that patient was working out after the vaccine too, and an athlete by nature, just made her even more curious. With the patient, it happened about 5 weeks post vaccination and no myocarditis that they have seen to date. The signs and symptoms are so spot on for what happened to him, and she was wondering if there are other reported cases that do not present the myocarditis. Patient could have died, in fact on paper, he did die and was resuscitated. The reporter was simply reaching for awareness because there was no one that can tell her this was not a cause of the vaccine. She was more curious as a concerned parent if any research to date notes that this could happen to kids, even if they do not have the classic myocarditis. He had all the warning signs. The outcome of the events was unknown.  The lot number for BNT162B2 was not provided and will be requested during follow up.