In the "kidney", it is possible to find the calculus mentioned here. There are three types: renal lithiasis, ureteral lithiasis and bladder lithiasis. The cause of the stone is a combination of several elements, and solidifies in the urine, particularly in people who don't drink enough water. In general, adults are affected by this disease; women aged 25 and over and men aged 40 and over. Hygiène et santé" program on Radio Don Bosco.