You can get false fears. Just before my op I had severe hip pain, I thought it was bound to be spreading. Then I woke 2 days before the op with some kind of lockjaw, something I'd never experienced before, it only lasted an hour.
Fortunately the nurse had told me that I'd have things happen and think it was cancer related when it wasn't, and that allayed it a little. Although not completely as I asked a couple of times at post op clinics if bone pain was possible with a very low psa and was told the psa would have registered by now. It's obviously arthritis now but it's a lot better.
I didn't want to mention my hip too much pre-op as such spread would stop my op.