DEAR DOCTOR K: I recently had a very painful kidney stone. What can I do to prevent another?
DEAR READER: First of all, my sympathies: Pain from passing a kidney stone can be as bad as any kind of pain. Kidney stones are hard, chemical deposits that form inside the kidney chambers where urine is collected. Urine passes from the kidney down a narrow tube (the ureter) and into the bladder. If a stone gets carried into the narrow ureter, it can get stuck. This can cause severe pain, bloody urine, nausea and vomiting. If you've had one kidney stone, you're at increased risk for another.