I've had kidney stones 3 times. It's the most pain I have ever experienced in my life. The Dr's equate it as what women go through when they have contractions in labor. Men are wimps compared to woman when it comes to a pain threshold. That's what my Doctor told me. Maybe so, I won't argue that point. My last stone was about that size and I passed it during my sleep. Thank God. I woke up one morning and felt something down there. I reached down and there it was right on the tip of my pee pee. Looked like a piece of crystal with sharp edges. Wicked looking. I urinated blood for a couple of days but it was pain free. Most people experience great pain. These days I drink plenty of water to dilute my system. Mine were calcium based.