Abstract: A method for treating a disease by returning the body to a natural condition. The method adjusts a parameter of a thermotherapy for treating or preventing the disease, disability, or condition of a patient and comprises (A) a step of measuring the redox potential (or pH value) of the patient and (B) a step of determining the parameter of thermotherapy suited to the patient according to the redox potential. Considering returning the biopotential to a range called homeostatic potential, a therapeutic potential of ?75 mV to ?90 mV (the potential in the cell is ?75 mV) the absolute value of which is higher than that of the cell is given. It has been found that this therapy effects a cure.

Abstract: A thermotherapy device for treating the substantially whole body of a human being by thermotherapy. The thermotherapy device is for a human body and provided with a heat capsule (5) and a control computer (8). The heat capsule (5) is filled with a Ringer's solution, and the substantially whole body of a human being except the head can be soaked in the Ringer's solution. The control computer (8) controls the temperature of the Ringer's solution in the heat capsule (5) to control the body temperature of the substantially whole body to a predetermined treatment temperature.

Abstract: A thermotherapy device for treating the substantially whole body of a human being by thermotherapy. The thermotherapy device is for a human body and provided with a heat capsule (5) and a control computer (8). The heat capsule (5) is filled with a Ringer's solution, and the substantially whole body of a human being except the head can be soaked in the Ringer's solution. The control computer (8) controls the temperature of the Ringer's solution in the heat capsule (5) to control the body temperature of the substantially whole body to a predetermined treatment temperature.