In the present paper we remind epidemiology, etiopathogenesis and physiopathology of urolythiasis, emphasizing the role of lythogenic and antilythogenic urinary costituents. Mineral waters used in prevention and therapy of urolythiasis are described, namely oligomineral waters and, in uric lythiasis, bicarbonate mineral waters. We stress the activity of oligomineral waters, regarding their very low concentration of solute, presence of oligoelements, and antilythogenic components. At the end, we outline the role of spa therapy in the correction of metabolic disorders, which are etiologic and pathogenetic factors of urolythiasis.