Is it possible to have no forewarning of a kidney stone– no pains, nausea, fever, or whatever–, but still pass one? For example, you're perfectly fine all day but go to pee and experience pain as if you were peeing glass, followed by a little black kidney-stone looking thing. does that make sense, medically? Because I've always known there to be symptoms accompanying the stones.

If you experienced it, it has to make sense. I once had a huge kidney stone that was giving me problems. As soon as it was broken up with ultrasound, the pain went away. However, when I went to pee, the tiny pieces of broken stone caused local pain.