I get a weird transient tinnitus where my hearing drops out in one ear or the other for about 15 seconds, and is replace by a tone, which slowly fades as my hearing comes back. It sometimes happens multiple times per day, and sometimes not for weeks at a time. I've seen a couple specialists about it, but no known cause.
I also notice a low-level tinnitus when I'm in very quiet places. I keep white noise machines around to cover it.
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