kidney and urinary tract disorders
Stones in the Urinary Tract
Causes of Urinary Tract Stones
Stones may form because the urine becomes too saturated with salts that can form stones or because the urine lacks the normal inhibitors of stone formation. Citrate is such an inhibitor because it normally binds with calcium that is often involved in forming stones. Stones are more common among people with certain disorders (for example, Hyperparathyroidism , Rarely, medications (includingindinavir) and substances in the diet (such as melamine) cause stones. 