negative impact on my ability to function at work, and my mental health; incredibly negative impact on my ability to function at work; I experienced a new tone, much lower than the usual one and only in my left ear; booster shot; This is a spontaneous report received from a contactable reporter(s) (Consumer or other non HCP). The reporter is the patient.  A 35 year-old male patient received bnt162b2 (BNT162B2), administered in arm left, administration date 13Dec2021 13:15 (Batch/Lot number: unknown) at the age of 35 years as dose 3 (booster), single for covid-19 immunisation. Relevant medical history included: "Psoriasis" (unspecified if ongoing); "very high pitched ring/hiss in my ears" (unspecified if ongoing), notes: I previously (for at least five years) had a very high pitched ring/hiss in my ears but it wasnt noticeable unless in a quiet setting. The patient's concomitant medications were not reported. Vaccination history included: Bnt162b2 (Dose Number: 2, Batch/Lot No: Unknown. Not available/provided to reporter at the time of report completion, Location of injection: Arm Left, Vaccine Administration Time: 10:30 AM), administration date: 04May2021, when the patient was 34 years old, for COVID-19 Immunization, reaction(s): "tinnitus has gotten much louder since receiving the first two doses"; Bnt162b2 (Dose Number: 1, Batch/Lot No: Unknown. Not available/provided to reporter at the time of report completion, Location of injection: Arm Left, Vaccine Administration Time: 10:30 AM), administration date: 13Apr2021, when the patient was 34 years old, for COVID-19 Immunization, reaction(s): "tinnitus has gotten much louder since receiving the first two doses". The following information was reported: MENTAL IMPAIRMENT (medically significant) with onset 15Dec2021 01:15, outcome "not recovered", described as "negative impact on my ability to function at work, and my mental health"; LOSS OF PERSONAL INDEPENDENCE IN DAILY ACTIVITIES (non-serious) with onset 15Dec2021 01:15, outcome "not recovered", described as "incredibly negative impact on my ability to function at work"; IMMUNISATION (non-serious) with onset 13Dec2021 13:15, outcome "unknown", described as "booster shot"; HYPERTONIA (non-serious) with onset 15Dec2021 01:15, outcome "not recovered", described as "I experienced a new tone, much lower than the usual one and only in my left ear". Therapeutic measures were not taken as a result of mental impairment, loss of personal independence in daily activities, hypertonia. No other vaccine in four weeks. The patient did not have covid prior to vaccination and covid was not tested post vaccination. No known allergies. The patient stated his tinnitus had gotten much louder since receiving the first two doses. He previously (for at least five years) had a very high pitched ring/hiss in his ears but it wasn't noticeable unless in a quiet setting. Now he can hear it constantly, and it's very loud. Additionally, 36 hours after the booster shot, he experienced a new tone, much lower than the usual one and only in his left ear. This had an incredibly negative impact on his ability to function at work, and his mental health.  The lot number for bnt162b2 was not provided and will be requested during follow up.