Hot spring water containing Sodium ions in excess of (1,200/A) x 1,000 mL per day for drinking

Medical conditions requiring salt control (kidney failure, heart failure, liver cirrhosis, ischemic heart disease, hypertension, etc.)

Hot spring water containing Potassium ions in excess of (900/A) x 1,000 mL per day for drinking

Medical conditions requiring potassium control (kidney failure, adrenocortical hyperfunction)

Hot spring water containing Magnesium ions in excess of (300/A) x 1,000 mL per day for drinking

Diarrhea, kidney failure

Hot spring water containing Iodine ions in excess of (0.1/A) x 1,000 mL per day for drinking

Hyperthyroidism

When two or more of the above apply

All contraindications that may apply

(Note) A refers to the weight (mg) of each component contained in 1 kg of hot spring water. The specific amount of hot spring water to be consumed should be calculated and stated based on the weight of each component. However, "The total daily amount of hot spring drinking should be limited to approximately 200-500 mL". When the specific limit is 500 mL or more, the daily drinking amount of the hot spring is exceeded, and therefore, no contraindication is required to be listed.
(Note) When hot springs containing 3,000 mg/kg sodium ion, 200 mg/kg potassium ion, 60 mg/kg magnesium ion, and 1 mg/kg iodide ion are to be consumed, the following contraindications should be listed for each component.
・If drinking hot spring water in excess of 100 mL per day (the limit calculated from the content of iodide ions): Hyperthyroidism
・If drinking hot spring water in excess of 400 mL per day (the limit calculated from the content of sodium ions): Medical conditions requiring salt control (kidney failure, heart failure, liver cirrhosis, ischemic heart disease, hypertension, etc.)
(Reference) In this case, the specific limit values calculated for potassium and magnesium ions are 500 mL or higher for the above reasons, and therefore do not require listing as contraindications.