Known since Roman times, Terme San Carlo is named for Saint Carlo Borromeo, the Bishop of Milan. While travelling through Massa, the bishop found himself in considerable pain due to kidney stones and he benefitted greatly by drinking from nearby thermal springs. This low mineral content water springs from its source at 12.8°C. Its chemical-physical characteristics are particularly recommended for curing diseases affecting the urinary tract. It is also used for metabolic dysfunctions, in addition to other illnesses that affect digestion.
Thanks to the noteworthy amount of oxygen it contains and its low level of mineralization, this water is particularly effective for disturbances linked with ageing and problems related to pregnancy, pediatric illnesses, fevers and post-surgery issues. It is also suitable for low-sodium diets. Treatments offered at these springs are covered by the National Healthcare Service for stones in the urinary tract and dyspeptic, gastrointestinal illnesses and disturbances within the bile system.