I have a 5mm kidney stone. i'd like to know when, during elimination, will it be the most painful? ureteter, bladder or urethra? i'm a male.

Ureter: More than likely the worse pain is when the stone is passing down the ureter and into bladder. You may get some pain or discomfort urinating the stone out.

Here are some...: If a 5-mm stone is inside kidney and not moving, you unlikely have pain. A stone of such size poses low odd for spontaneous passage, prior stone passage will help decide if worthwhile to act or wait. If act and it is visible with x-ray, shock wave may disintegrate it; if not visible or in ureter or still in kidney, holmium laser through urehtra and ureter is the choice, Remember nothing is free...