I passed a kidney stone today, and I’ve got to say that is one of the most painful experiences ever. I don’t ever want to do it again. (Although, since I’ve had one, I’m told I have a greater chance of getting more, bleargh!)
Here’s the culprit:

I’ve passed some more sand size ones since the pic.(The doctor gives you a strainer so you can save them, and the ycan see what kind they are, and figure out how to prevent more–although the greatest factor is hydration.)
The pain is gone now, thank goodness it passed relatively quickly.