When I tell people that I have passed hundreds of kidney stones, I suspect they rarely believe me. Pictured above is a collection that represents about a quarter of the stones that have passed through my body. Capturing them is inconvenient. Think pee bottle and coffee filter, not something you tend to carry around with you. The pain associated with each stone is a function of size and surface texture. The smallest stones are more like grains of sand but they often come in large numbers which can be just as painful as the larger stones. About 10% of older men can expect to have a kidney stone at some point. The best preventative is to drink lots of water, something I struggle with because I have a nearly absent thirst reflex. I wish I was not plagued with these stones but I have been blessed in so many other ways that I consider it a fair price to pay.