Why're they called hemorrhoids?

Surely they should be called asteroids? :

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Hemorrhoid Jokes More Hemorrhoid Jokes

What's your favorite "grosser than gross" joke?

Mine is hickey on a hemorrhoid.

What did the dyslexic, epilptic with hemorrhoids say?

If I fits I sitz."

Asteroid Jokes More Asteroid Jokes

What type of dinosaurs roamed the Mediterranean before the asteroid hit?

Falafel Raptors. (sorry)

Why are they called hemorrhoids?

Because asteroids was already taken.