Since the exact cause and trigger of tinnitus isn't yet fully understood, it may receive as many comments as there are postings. I had and continue to have partial hearing loss over the last 5 years, now age 70. In my case, a 3 day long unresolved headache, probably triggered by the initial pfizer covid-19 vaccine in early 2021, brought on left ear tinnitus (I never had covid). After 2 weeks, prednisone was started. It helped diminish the sound to almost unnoticeable during the day. Not so at night. I've continued with the vax and eventually both boosters. The last Omicron booster aggravated tinnitus, followed by prednisone after 2 weeks. To little avail. I don't regret the vax, but moderate hearing loss along with long lasting migraines (in my case) seem to go hand-in-hand with aggravating tinnitus.