system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: how does the human body create stones like kidney stones?
gpt
For kidney stones, your kidneys reabsorbs roughly 95% of the calcium that is reabsorbed into the body. You also excrete excess calcium from your body through your urine so your kidneys do that function as well. In an organ that is heavily involved in processing calcium, it's easy to see how excess amounts of calcium could build up and crystalize in the kidney. Think of it like sand going through a filter, some times the grains get caught in the filter media, once there's something caught in the media, more grains are likely to build up in that area until you have a complete blockage.