bradycardia; autonomic dysfunction; autonomic dysfunction that progressively worsened over the course of 6 months; heart palpitations; flushing; tachycardia; chest pain; dizziness; vertigo; small fiber neuropathy; This is a spontaneous report received from contactable reporter(s) (Consumer or other non HCP). The reporter is the patient.  A 44-year-old male patient received BNT162b2 (BNT162B2), on 06Oct2021 as dose 3 (booster), single (Lot number: FE3590) at the age of 43 years, in right arm for covid-19 immunisation. The patient's relevant medical history included: "Hypothyroidism" (unspecified if ongoing). Concomitant medication(s) included: SYNTHROID; AFLURIA QUAD, on 27Oct2021. Vaccination history included: BNT162b2 (Dose 2, Single, Lot No: EN6201, Location of injection: Arm Right), administration date: 10Feb2021, when the patient was 43-year-old, for Covid-19 Immunization; BNT162b2 (Dose 1, Single, Lot No: EL9262, Location of injection: Arm Right), administration date: 20Jan2021, when the patient was 43-year-old, for Covid-19 immunization. The following information was reported: SMALL FIBRE NEUROPATHY (hospitalization, disability) with onset Jan2022, outcome "recovered with sequelae", described as "small fiber neuropathy"; BRADYCARDIA (hospitalization, disability, medically significant), outcome "recovered with sequelae"; AUTONOMIC NERVOUS SYSTEM IMBALANCE (hospitalization, disability), outcome "recovered with sequelae", described as "autonomic dysfunction"; CONDITION AGGRAVATED (hospitalization, disability), outcome "recovered with sequelae", described as "autonomic dysfunction that progressively worsened over the course of 6 months"; PALPITATIONS (hospitalization, disability), outcome "recovered with sequelae", described as "heart palpitations"; FLUSHING (hospitalization, disability), outcome "recovered with sequelae"; TACHYCARDIA (hospitalization, disability), outcome "recovered with sequelae"; CHEST PAIN (hospitalization, disability), outcome "recovered with sequelae"; DIZZINESS (hospitalization, disability), outcome "recovered with sequelae"; VERTIGO (hospitalization, disability), outcome "recovered with sequelae". The patient was hospitalized for bradycardia, autonomic nervous system imbalance, condition aggravated, small fibre neuropathy, palpitations, flushing, tachycardia, chest pain, dizziness, vertigo (hospitalization duration: 7 day(s)). The patient underwent the following laboratory tests and procedures: SARS-CoV-2 test: (22Nov2021) Positive. Therapeutic measures were taken as a result of bradycardia, autonomic nervous system imbalance, condition aggravated, small fibre neuropathy, palpitations, flushing, tachycardia, chest pain, dizziness, vertigo. Patient received steroid as treatment. Clinical course: Patient didn't had covid prior vaccination. Patient tested covid post vaccination.Began developing autonomic dysfunction that progressively worsened over the course of 6 months. Symptoms and signs included flushing, heart palpitations, bradycardia, tachycardia, chest pain, dizziness, vertigo. Was diagnosed with small fiber neuropathy in Jan2022. Adverse event started date was 01Mar2021.  No follow-up attempts are possible. No further information is expected.