system
Given the following post, respond as if you're commenting on Reddit:
human
Why do you sometimes temporarily lose your hearing when yawning?

Edit: more of an impairment that a complete loss of hearing, I can still hear it’s just muffled and quite.
gpt
When you yawn you end up flexing your tensor tympani muscle, a muscle in the ear that is used to dampen loud sounds like when you chew food.

Some people can flex this muscle independently of yawning. One way you might be able to do so is by shutting your eyes very tightly and kind of scrunching your face as you do so. It should sound like a low rumbling sound.