Afib; shortness of breath; swelling of the legs and face; swelling of the legs and face; fatigue; very low appetite; congestive heart failure; This is a spontaneous report received from a contactable reporter(s) (Consumer or other non HCP). The reporter is the patient.  A 58 year-old male patient received BNT162B2 (PFIZER-BIONTECH COVID-19 MRNA VACCINE), administered in arm right, administration date 11Nov2021 (Lot number: FF2588) at the age of 58 years as dose 3 (booster), single for COVID-19 immunisation. Relevant medical history included: "High blood pressure" (unspecified if ongoing); "COVID-19" (unspecified if ongoing). The patient took concomitant medications. Vaccination history included: BNT162B2 (Dose 1; Lot number EN2605 in right arm), administration date: 26Feb2021, when the patient was 57 years old, for COVID-19 immunization; BNT162B2 (Dose 2; Lot number: EP7534 in left arm), administration date: 19Mar2021, when the patient was 58 years old, for COVID-19 immunization. The patient did not receive any other vaccines within four weeks prior to the vaccination. The following information was reported: DYSPNOEA (hospitalization, disability, life threatening) with onset 15Nov2021, outcome "not recovered", described as "shortness of breath"; PERIPHERAL SWELLING (hospitalization, disability, life threatening), SWELLING FACE (hospitalization, disability, life threatening) all with onset 15Nov2021, outcome "not recovered" and all described as "swelling of the legs and face"; FATIGUE (hospitalization, disability, life threatening) with onset 15Nov2021, outcome "not recovered", described as "fatigue"; DECREASED APPETITE (hospitalization, disability, life threatening) with onset 15Nov2021, outcome "not recovered", described as "very low appetite"; CARDIAC FAILURE CONGESTIVE (hospitalization, disability, life threatening) with onset 15Nov2021, outcome "not recovered", described as "congestive heart failure"; ATRIAL FIBRILLATION (hospitalization, disability, life threatening) with onset Feb2022, outcome "not recovered", described as "Afib". The patient was hospitalized for dyspnoea, peripheral swelling, swelling face, fatigue, decreased appetite, cardiac failure congestive (start date: Dec2021, hospitalization duration: 3 day(s)). The events "shortness of breath", "swelling of the legs and face", "swelling of the legs and face", "fatigue", "very low appetite", "congestive heart failure" and "afib" were evaluated at the physician office visit and emergency room visit. The clinical course was reported as follows: The month after the last vaccine, the patient started having shortness of breath, swelling of the legs and face, fatigue and very low appetite. He ended up in the hospital the middle of Dec2021, where they said he had congestive heart failure then found out in Feb2022, he also developed atrial fibrillation. The hospital told the patient this was caused over time and can't find a reason. The only thing the patient did before this happened was the booster vaccine. The patient received multiple tests and lots of medications as treatment for the events. The patient underwent the following laboratory tests and procedures: investigation: unknown results. The patient underwent the following laboratory tests and procedures: investigation: unknown results. Therapeutic measures were taken as a result of dyspnoea, peripheral swelling, swelling face, fatigue, decreased appetite, cardiac failure congestive, atrial fibrillation. It was also reported that since the vaccination, the patient had not been tested for COVID-19.