There is a difference between city water bathing and hot spring water bathing in changing lipid metabolism, steroid metabolism etc. in serum and connective tissue. Remarkable differences are seen due to the quality of hot spring water and also due to the duration of bathing. It is usually observed that fatty acid and steroid in serum increased and decreased contrary to those in connective tissue. From the changes of lipid metabolism I studied the special function of hot spring bathing.
