Description Urine is formed by the kidneys. Sometimes, a problem causes the dissolved substances to become solid again. Tiny crystals may form in the urine, meet, and cling together to create a larger solid mass called a kidney stone. Many people do not ever find out that they have stones in their kidneys. These stones are small enough to allow the kidney to continue functioning normally, never causing any pain.
Kidney stones cause problems when they interfere with the normal flow of urine.
The kidney is not accustomed to experiencing any pressure. If the kidney is subjected to this pressure for some time, it may cause damage to the delicate kidney structures. Because the ureters are muscular tubes, the presence of a stone will make these muscular tubes spasm, causing severe pain. Relatives of kidney stone patients. These stones are composed of either calcium and phosphate, or calcium and oxalate.