Why're they called hemorrhoids?

Surely they should be called asteroids? :

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Hemorrhoid Jokes More Hemorrhoid Jokes

What did the dyslexic, epilptic with hemorrhoids say?

If I fits I sitz."

What do you call a nice guy with hemorrhoids?

A stand up guy

Asteroid Jokes More Asteroid Jokes

Why're they called hemorrhoids?

Surely they should be called asteroids? :

What's the difference between us and the dinosaurs?

We don't need an asteroid...