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E#ect and Side E#ect of Hot Spring
Takuo SHIRAKURA, M.D.
Prof. Emeritus, Gunma University

Abstract
Bathing using hot spring had played an important role as a therapeutic agent forvarious diseases in old Japan. Even at the present time when modern medicine has
popularized, many hot springs in Japan have been extensively used to the hydrotherapy
against such diseases with pain as rheumatoid arthritis, osteoarthritis, and also forrehabilitation of the patients with cerebral vascular disease.
Now, one of the most expectative use of hot spring is for the promotion of health andprevention against diseases. Unfortunately, health resort medicine is much more undeveloped in Japan, relating to European countries. Another one is to play an importantrole in complementary and alternative medicine for the chronic therapy-refractorydiseases such as the deseases already described. On the other hand, the fact should be
noted that acute diseases including myocardial infarction, cerebral infarction, syncopal
attack have not occurred infrequently during or after bathing in hot spring, mainly inelderly people. These unexpected side e#ects of hot spring are observed in Japanese spas,
while not reported in other countries. Bathing in water temperature above ., issuspected as a risk factor of thrombus-formation in such thrombotic diseases.
Thus, author would like to stress the following attentions for bathing in hot spring,
especially to elderly people.
+ Bathing under water temperature below .,.
, Drinking of more than /** ml of ion-water (namely isotonic solution including
sodium, potassium, chloride and so on) before and/or after bathing.
Key words : balneotherapy, e#ect of hot spring, side e#ect of hot spring, health resort
83a84

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Table +Nature and Characteristics of Hot Spring Water

nature of hot spring water
simplecarbon dioxide
sodium bicarbonate
sodium chloride
sodium sulphateironhydrogen sulphideacid
radioactive

medical characteristics

vasodilatation
moisturizing e#ect
heating e#ect
heating e#ect
vasodilatation
bactericidal e#ect

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