Why're they called hemorrhoids?

Surely they should be called asteroids? :

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Hemorrhoid Jokes More Hemorrhoid Jokes

What does a math teacher do when he has hemorrhoids?

He works them out with a pencil.

What do you call a nice guy with hemorrhoids?

A stand up guy

Asteroid Jokes More Asteroid Jokes

What did the asteroid say when his trajectory missed earth?

I guess I didn't plan it very well!"

What's the difference between us and the dinosaurs?

We don't need an asteroid...