Answer:
I run up and down the stairs without moving
I go through a door but never go in and never come out.
I can be hairy and itchy all over. I hang on a stick. I can be the scariest thing you have ever seen. I stand in the middle of nowhere.
I am easy to waste and unstoppable. What am I?
My flavors ranges from strawberry to toe.
Almost everyone needs it, asks for it, gives it. But almost nobody takes it.