Doc, I'm not trying to get a diagnosis. I just can't imagine spraining the neck without actually knowing it. I've been in a car accident and a sore neck later but it was a situation with a duh... for an answer. In this case, I couldn't think of a thing that happened to cause this. However, as a buggy pusher/bagger at a grocery store over this summer, I have pushed a couple more at a time than they have told me too. I didn't think of it till I went back and puushed some more.