As I sit, writing, my left ear is filled with the Classic Hum. Both my ears used to hear it, but after an ear infection in the right ear, leaving no measurable loss of hearing as determined by yearly workplace hearing tests, I no longer hear it in the right.
Certainly, others must hear it.
My wife, largely complete loss of hearing in one ear, high frequency Tinnitus in the other, and myself, excellent hearing as tested by yearly workplace physicals, started hearing the HUM on the same day, in the same location, over a decade ago. We hear it exactly the same in a number of places separated by hundreds of miles. We have experimented by asking if the other could hear the HUM, whether in certain parts of the structure we were in (home we rented in the Country, home we owned in the City) if it was louder, quieter, or audible at all, and had an extremely high degree of concurrence.
It appears to be a real world event, not Tinnitus, but IMHO, the American Medical Community is trying to pawn it off as Tinnitus. I've seen a few references to the National Institutes of Health claiming, on flimsy questionnaires sent out, that the HUM is, indeed, Tinnitus.
My wife heard it, simultaneous to me hearing it, for a decade, I still hear it, but if you mention this to doctors, they look at you like you have snakes coming out of your head. My ENT has been sick, so my appointment with him has been delayed, he's back to work but catching up. I see the ENT due to a cancerous thyroid he removed. But recently, my right ear has been acting up. It makes a spontaneous rumbling noise that I can voluntarily reproduce. But telling this to my family doctor, that I can voluntarily make this rumbling (not the HUM) and also mentioning the HUM, since I hear it in my left ear but the right ear is acting up, on both counts, I don't think he believes me, or understands. Yet, yesterday, I found an article that says that some people have voluntary control over a muscle attached to the Tympanic Membrane. That's my voluntarily induced rumbling (not HUM).
So, there are some forms of Tinnitus, "Pulsatile Tinnitus (PT) is a symptom that affects nearly five million Americans. The sensation of hearing a rhythmic noise, such as a heartbeat, swooshing or whooshing, from no external source, is, at best, a little unsettling; for many, the near constant sound exceeds annoyance and becomes completely debilitating" that can cause noises in your hearing, but decidedly is not the HUM. I'd be interested in reading what others have to say on these experiences, if you don't feel like outing yourself, you could always say a friend of yours…….