I shiver randomly.

Everyone does that all the time, me too, and i even do the voice. "brrrrr"

I just found this site through searching (yahoo search) this question, and yes, I do it too, and as far as I know am in good health. No, I don't think it'll kill you. It being related to stress is probably the best conclusion, I would assume.

you were adopted by someone else you are scretly a chihawwawa .

Yep, it's normal and funny as hell when I see other people doing it. lol. I do it when it's hot, cold, warm, whenever. It's just really awkward because sometimes people look at you like, "wth?"

Its way to normal.

Relaxing will make this stop.

When you're shivering, try relaxing techniques, breathing, lowering your shoulders etc.

Yes it is perfectly normal. It's just your muscles getting a little to tense so it spasms a bit. Don't worry, your fine.

I do this as well, I never really thought about it though.

i do this too

i get that too sometimes, i think everyone does.
my dad calls it a pee shiver :s
ever since he said that i have noticed that after i randomly shiver i have to pee...