system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: What exactly causes you to feel "choked up" when you're crying?

That squeezing in your throat feeling when you start to cry?
gpt
There's something in your throat that blocks the windpipe opening when you're swallowing called the glottis. It's kind of like a little trapdoor that stops food from getting into your lungs. When you cry, or have anxiety, or are upset etc. the glottis swells up and creates unfamiliar pressure down there, triggering a reaction similar to having an obstructed airway and causing trouble swallowing and the "lump" feeling. Basically humans have poorly designed holes and crying is weird so weird stuff happens.