I was extremely weak; I tired out quickly after shortest activity; I would get nauseous while working; My appetite has been horrible; Sinus infection; My mouth became very sensitive and broke out with very painful small sores; I've lost 5 pounds.; have difficulty eating any acidic or spicy food.; This is a spontaneous report received from a contactable reporter(s) (Consumer or other non HCP). The reporter is the patient.  A 43 year-old male patient received bnt162b2 (BNT162B2), administered in arm left, administration date 25Mar2021 (Batch/Lot number: unknown) at the age of 43 years as dose 2, single for covid-19 immunisation. Relevant medical history included: "Recent liver transplant recipient" (unspecified if ongoing), notes: Recent liver transplant recipient; "Allergies: Sulfa drugs" (unspecified if ongoing). Concomitant medication(s) included: CYCLOSPORINE; MYCOPHENOLIC ACID; DESCOVY; TIVICAY. Past drug history included: Viraumune, reaction(s): "Allergies: Viraumune", notes: Allergies: Viraumune; Sustiva, reaction(s): "Allergies:Sustiva", notes: Allergies:Sustiva. Vaccination history included: Bnt162b2 (Dose: 01, Anatomical Location : Arm Left   , Time; 03: 00PM), administration date: 11Mar2021, when the patient was 43 years old, for COVID-19 immunization, reaction(s): "Left arm was sore". The following information was reported: ASTHENIA (non-serious) with onset 28Mar2021 12:00, outcome "recovering", described as "I was extremely weak"; FATIGUE (non-serious) with onset 28Mar2021 12:00, outcome "recovering", described as "I tired out quickly after shortest activity"; NAUSEA (non-serious) with onset 28Mar2021 12:00, outcome "recovering", described as "I would get nauseous while working"; APPETITE DISORDER (non-serious) with onset 28Mar2021 12:00, outcome "recovering", described as "My appetite has been horrible"; SINUSITIS (non-serious) with onset 28Mar2021 12:00, outcome "recovered" (05Apr2021), described as "Sinus infection"; ORAL PAIN (non-serious) with onset 28Mar2021 12:00, outcome "recovering", described as "My mouth became very sensitive and broke out with very painful small sores"; WEIGHT DECREASED (non-serious) with onset 28Mar2021 12:00, outcome "recovering", described as "I've lost 5 pounds."; EATING DISORDER SYMPTOM (non-serious) with onset 28Mar2021 12:00, outcome "recovering", described as "have difficulty eating any acidic or spicy food.". The events "i was extremely weak", "i tired out quickly after shortest activity", "i would get nauseous while working", "my appetite has been horrible", "sinus infection", "my mouth became very sensitive and broke out with very painful small sores", "i've lost 5 pounds." and "have difficulty eating any acidic or spicy food." were evaluated at the physician office visit. Relevant laboratory tests and procedures are available in the appropriate section. Therapeutic measures were not taken as a result of asthenia, fatigue, nausea, appetite disorder, sinusitis, oral pain, weight decreased, eating disorder symptom.  Additional information: Following the second shot he was easily over exerted himself from just sitting upright at his home desk. His mouth became very sensitive and broke out with very painful small sores. he still have difficulty eating any acidic or spicy food.  His doctor even gave hima a herpes test, which came back negative, because of the mouth situation. His sinuses felt as if he had a full blown sinus infection up until April 5th, when the adverse reactions began to subside. As of today, he still had 1 sore still healing in his mouth. The adverse event resulted in Doctor or other healthcare professional office/clinic visit.  He did not receive any treatment for adverse event. Prior to vaccination, he was not diagnosed with COVID-19. Since the vaccination, he had not been tested for COVID-19. He did not receive any other vaccines within 4 weeks prior to the COVID vaccine.  No follow-up attempts are possible; information about lot/batch number cannot be obtained. No further information is expected.