system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5:What are doctors looking for when they check your ears?

Just got a physical and it got me thinking. What are doctors looking for in your ear? Please help. 

Edit: Thank you guys. Some really informative explanations. Reddit never fails me.
gpt
Doctors look for fluid in the ears, what the tympanic membrane (ear drum) looks like to look for inflammation, and overall condition of the skin inside to make sure there aren't cuts or full of cerumen (ear wax)