I have had tinnitus flare ups for several years. Most of the time, its like the sound from a sea shell placed up to your ear. Other times, pretty loud and bothersome. In March of this year I took my second Pfizer vaccine. Two days later, the ringing in my right ear got louder and louder, at times sounding like a hearing aid that was not adjusted properly. By late evening, I had lost all hearing in my right ear. Have been to an ENT and nothing looks out of the ordinary. I was placed on a very large dose of steroids to try to bring my hearing back but that failed; only made my diabetes numbers go through the roof. I now have an appointment with a neurologist at MUSC. Hearing has not come back yet and the tinnitus is awful. Very, very loud. My daughter is a RN in Charleston, S. C. and their practice has seen several cases of hearing loss after Covid vaccine. The ENT`s in Charleston has now given this hearing loss a name. BTW, I failed to mention that my hearing in my left ear is at 65-70% loss. I honestly can not say with 100% certainty that the Pfizer vaccine did this but really makes you think! Especially when other cases are showing up. Good luck to all.