system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why is it that my whole finger tip starts to hurt when I cut my nail too short?

I know that there are a lot of nerve endings there, but what actually causes them to be agitated?
gpt
When you cut your nail too far down, you expose the hyponichium, which is the skin that connects your nail plate and your finger. The hyponichium is very sensitive and does have a lot of nerve endings. And since the hyponichium is usually not exposed, it has no need to be "tough" like your regular skin.