To provide a method for making a living body mentally relaxed as the living body obtains comfort and to utilize the method of obtaining the comfort for the treatment to relieve pain by solving problems of a conventional bath sold on the market, wherein the conventional bath such as a bubble bath called jacuzzi, a bath using jet water stream or bubble water stream or an electric bath is for the living body to obtain the massage effect by applying the physical load and stimulating the muscles of the living body but not for the living body to feel comfort and mentally relaxed, and wherein the bath does not have a function as a medical device to relieve pain by applying the physical load.

The hot bath with underwater digital vibration stimulation is developed because there is a clinical example of the therapy using a digital vibration stimulation device, and because of the inventor's own experience in diving.

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