I've got a sty in my eye.

Can someone explain to me how this happens? Every so often I just end up with one. I read the definition of sty on the internet, and what causes it but frankly, neither one was very helpful. I'm still here with this damn thing poking me in the eyeball, and without a way to get rid of it.

Now if things stay true to normal, it will be gone soon. Which I suppose I should just take comfort in, and stop worrying about it. Nonetheless I'm curious about what I could possibly do to avoid this discomfort at a later time.

Thoughts?