Humming and/or ringing
in the ears This is not Tinnitus, though it feels like it might be.

The other thing that will be happening very soon as a result of all the things that you are moving through, is that your ears will take another step into change. Some of you will hear ringing that will go on and on and on and on. Take it as a vibrational imprint for it simply means that you are vibrating in harmonics with a new alternate reality which is very close to yours.

From Archangel Michael:
Oh, do not think that you cannot hear the sound