chest pain; Caller stated the patient had an EKG showing irregular heartbeat.; diarrhea; Myocarditis; fever; didn't feel well; warm; This is a spontaneous report from a contactable consumer (Patient's Parent). A 19-year-old male patient received bnt162b2 (BNT162B2, Formulation: Solution for injection, Lot number: EW0187, NDC number and Expiration date are Unknown), via an unspecified route of administration, administered in Left arm on 22May2021 11:30 (at the age of 19-years-old) as 2ND DOSE, SINGLE for covid-19 immunisation. The Patient's medical history (including any illness at time of vaccination) was none and concomitant medications were not reported. The patient previously took first dose of historical vaccine, bnt162b2 (BNT162B2, Formulation: Solution for injection, Lot number: EW0176, NDC number and Expiration date are Unknown) via an unspecified route of administration, administered in Left arm on 01May2021 10:30 (at the age of 19-years-old) as single dose for covid-19 immunisation. Additional vaccines administered on same date of the pfizer suspect were none. The patient did not receive any other vaccinations within four weeks prior to the first administration date of the suspect vaccine. Adverse events following prior vaccinations were none. Family medical history relevant to adverse events was none. Relevant tests were unknown. It was reported that her 19-year-old son got the 2nd dose of the vaccine on 22May2021 and 2 days later on 24May2021, he wound up with chest pain and the caller took him to emergency room and the patient was diagnosed with myocarditis and admitted to the hospital. The Reporter clarified the patient's chest pain started when he woke up around 08:30-09:00. On an unspecified date in May2021 at 23:30, the patient had a fever starting about 12 hours from receiving the second dose and it lasted for 24 hours, and the patient didn't feel well on an unspecified date in May2021. At one point he didn't want to wake his parents up around 11:30 p.m. but he was warm on an unspecified date in May2021. At 0600am the next day, the caller took the patient's temperature, and his fever was 100.9 Fahrenheit. The caller carried the patient to the emergency room on 24May2021 due to his chest pain. It was reported that patient's EKG was extremely irregular and caller stated that if it was her or her husband's EKG, they would have been having an MI, but since the patient was only 19, the doctors didn't think MI was possible. The patient was then diagnosed with myocarditis. It was reported that the patient experienced diarrhea on 24May2021. Chest Pain required a visit to Emergency Room on 24May2021 and the patient was hospitalized from 24May2021 to 26May2021. It was reported that, the patient received treatment with Colchicine 0.6 mg (NDC number and Lot number: unknown, Expiration Date: 26may2022) one tablet by mouth twice a day. The patient came home from the hospital with this prescription on 26May2021 and he is still taking this medication. Prescribed to take it twice daily for a month. Famotidine, it is like a Pepcid. 20 mg (NDC number and Lot number: unknown, Expiration Date: 26Mayy2021) one tablet by mouth twice a day for 6 days, because of the heavy dose of ibuprofen and diarrhea. The patient had completed this medication. Ibuprofen 600 mg (NDC number, Lot number: unknown and Expiration Date: unknown) 1 tablet by mouth three times a day for six days and this has script had ended. Caller stated that her son was recovered but that he was still taking the treatment medications at this time. Caller stated that her son's symptoms are improved, he was not complaining of chest pain anymore, she assumes his myocarditis was improved because he was not complaining of the chest pain. The patient underwent lab tests and procedures which included body temperature: 100.9 Fahrenheit on an unspecified date in May2021, EKG (electrocardiogram): extremely irregular on 24May2021, PCR COVID test (sars-cov-2 test): negative on an unspecified date in May2021 while in the hospital. Caller stated the patient had an EKG showing irregular heartbeat.It was reported that the patient had tests but she didn't have results available and the patient had a PCR COVID test in the ER. Caller stated that all of this was related to the vaccine. Caller also stated that she is wondering if her son would have reacted differently if he had gotten the Moderna, but caller and her husband had gotten Pfizer and didn't have any problems. Reporter seriousness for Myocarditis, diarrhea and fever was unspecified. The outcome of the events, Myocarditis, chest pain, diarrhea and irregular heartbeat was recovering and for fever was recovered on an unspecified date in May2021 and for other events was recovered on an unspecified date in 2021.  Additional information requested.