Besides receiving a heart, Dorothy Gale's sheet-metal lumberjack friend also asked The Great Wizard to install a pair of hearing-devices to cure his inherent tinnytus.
A ringing in the ears. It's normally temporary, but it can be permanent. People who frequent loud concerts and/or people who listen to their MP3 players at full blast (with headphones, of course) are the main victims of Tinnitus.
Random Teenager: Damn, why did I have to listen to my music so loud? I wish I had just turned down the volume. How am I supposed tosleep with this Tinnitus?
Hearing the faint persistent constant ringing sound of an incoming call from your meeting software (e.g Microsoft Teams or Zoom) due to long forced work from home meeting fatigue.
Bob abruptly ended his bio break to run back for a Teams call but realized it was only his Corona Tinnitus.
A ringing in the ears that sounds like a hovering mosquito, brought on by the anticipation that mosquitoes WILL begin to torment you just as you are dozing off.