I had an ear problem a couple years back which eventually cleared up 100%.
The funny thing was although my ears were extremely plugged and ringing from this problem (my ears were filled with fluid from severe allergies) I aced the hearing test anyway!
The doctor said I was hearing fine when it was obvious I wasn't hearing good at all.
I figured this was because I've been trained to distinguish subtle differences in sound my whole life.
It was interesting.
They might even need a different test for musicians and engineers.