Yikes... I wonder if there's an equivalent alarming-but-seemingly-innocuous situation for hearing. I'd imagine the analog for this would be something like tinnitus... anybody know?
Any rapid change that you notice in your body should be checked out by a doctor.
Tinnitus is frequently a result of hearing loss, I couldn't tell you if it is ever a precursor.
I have moderate tinnitus in my left ear and also some hearing loss. Tinnitus can be pretty obnoxious, it's one of those weird things that if you concentrate on it, it gets worse.
I'm hopeful for some sort of procedure or drug to someday alleviate it, but for now I just live with it.
I think maybe the same rule of thumb applies to tinnitus; if it starts suddenly without warning and persists then get it checked out. Otherwise, it may be normal. I've had mild tinnitus for years but it never occurs during the day unless I've been listening to very loud music and only rarely happens for a few seconds right before falling asleep. Fortunately, my symptoms also haven't gotten perceptibly worse for the last few years.