The urologist told me that it is simple to prevent kidney stones - just avoid salt. Oh well, it's easier said than done. I had my first kidney stones in 1994. The manifestation was a painful back or backside. To ease the pain, I underwent the procedure called lithotripsy which would crack the stones by shock waves. But after 5 years, there's my affair with kidney stones again for the second procedure of lithotripsy. I have to admit that I love salty foods like salt itself and shrimp paste. There's also the chips and other street food. But now I have mellowed and had come to terms that we should not indulge in salty foods to protect our kidneys. So if you love salty foods like me, you'd better think of your health.