system
Given the following post, respond as if you're commenting on Reddit:
human
What exactly is happening when my ears "pop"?
gpt
Inside your ear canal is a flap of skin that closes the inner ear off from outside world called the ear drum. Behind the ear drum is an enclosed air space. The pressure inside that air space can be different from the outside air and this causes pain. When the pressure is finally equalized the ear drum snaps back into its regular place and you hear a "pop".