I have hearing loss in both ears, worse in the right...some may be from shooting without protection years ago (Army and Civilian), but I think most of it is from the jet engined power station used with the Pershing missile system.
I have two types/levels of background noise. One is the single ringing frequency that is accompineed by a blancking...kind of like an AGC works in an autio system...this sound comes and then slowly goes, usually of a very short diration, either ear...but when it does happen it is quite pronounced.
The other sounds I hear are weaker, but always present (unless blanked out by the "ringing"). They sound more like wind in the trees or chirping birds (bearings?) They are veriable in frequency and intensity, but always there.
Where we live it is extremely quiet (our kids say it is too quiet), but when I go to bed at night, that is when I hear the secondary sounds most pronounced. No, it isn't from wind or birds, plugging the ear does not make the sound go away,
Haven't been to an audiologist since I left the Army, but the problem was there when I left, but I do know it is getting worse as I have trouble hearing my wife, and others when they speak to me. (64 years old)