His friend has four friends that were in their early 50s that had mild strokes after the vaccine.; This is a spontaneous report received from a contactable reporter(s) (Consumer or other non HCP) from medical information team.  An adult patient received BNT162b2 (BNT162B2), as dose number unknown, single (Batch/Lot number: unknown) for covid-19 immunisation. The patient's relevant medical history and concomitant medications were not reported. The following information was reported: CEREBROVASCULAR ACCIDENT (medically significant), outcome "unknown", described as "His friend has four friends that were in their early 50s that had mild strokes after the vaccine.". Clinical course: Reporter state that male, aged 73, is calling about the Pfizer BioNTech Covid 19 vaccine that he received last year on 04Jun2021. The day after he could only bike 8 miles in two hours. That Saturday and Sunday were terrible. He used to be able to bike up to 30 miles no problem, but now he struggles with short distances. His heart can't take it. If he does do a long bike ride, he has to sleep until 6pm the next day, he is just absolutely exhausted. He has been to the ER at least five times. He is scheduled to see a cardiologist but can't get an appointment until Aug. Now he has a nagging numbness that goes up and down from his elbow to his shoulder and then it'll go away. On the one year anniversary of the shot 04Jun2022 he had sharp pains to the heart. He thought he had severe asthma and that's why he wanted to get the vaccine. His friend had to be helicoptered to a medical facility for a massive heart attack after taking the vaccine. A friend of his, a 39 year old athlete, is having problems after the vaccine and the doctor says its all in her friend. Can you give me any recommendations on how to treat what I have? Pfizer and that other company have no liability. Why can't you give medical advice if Pfizer makes the vaccine? His friend has four friends that were in their early 50s that had mild strokes after the vaccine. Reporter wanted to update the caller that no further information regarding the adverse events he has experienced / has been experiencing can be found. The only information we have about the Pfizer BioNTech COVID-19 Vaccine that is related to heart conditions is the following: Myocarditis (inflammation of the heart muscle) and pericarditis (inflammation of the lining outside the heart) have occurred in some people who have received Comirnaty (COVID-19 Vaccine, mRNA) or the Pfizer-BioNTech COVID-19 Vaccine, more commonly in adolescent males and adult males under 40 years of age than among females and older males. In most of these people, symptoms began within a few days following receipt of the second dose of vaccine. The chance of having this occur is very low. We do appreciate the caller taking time to file a report to safety, but at this time, we cannot give any advice and we would have to refer him back to his doctor or HCP for further guidance. Pfizer needs to tell the cardiologists about these heart side effects. Everyone he knows he goes to see a cardiologist isn't being taken seriously.  The information on the batch/lot number for BNT162b2 has been requested and will be submitted if and when received.