Margaret Pearle of the University of Texas Southwestern Medical School in Dallas has co-authored a study that shows a relationship between kidney stones and temperatures everywhere. Even in places with air conditioning, warmer temperatures mean more stones. Kidney stones result from salts crystallizing in the kidneys, often triggered by dehydration, causing painful blockages. Nationwide, kidney stones strike about 12% of all men and 7% of women over their lifetime. Kidney stones have been on the rise nationwide since 1976, and studies have shown summer bumps in cases. Drinking water and staying cool can limit kidney stone risks and people with a family history are at higher risks.