A method and system uses heat generated by radio frequency (RF) signals induced hyperthermia to destroy abnormal cells that cause diseases. A patient's body is not invaded with any substance or equipment. This invention incorporates a physical phenomenon that occurs when RF signals are added. When the amplitudes of RF signals are added there is a marked increase in the amplitude of the resulting signal. The physics of RF signals causes the intensity of the resulting signal to quadruple. Heat is generated as a result of intensity. In the present invention, multiple RF signals are added at a target location. At this location, preferably the amplitudes of the RF signals that are in phase. When this occurs, the intensity at that target location dramatically increases thereby the heat at that point dramatically increases. The intense heat at the target location destroys the cells at the target location. However, the amplitudes of the RF signals are only added at the target location. As a result, the increased intensity and intense heat only occur at that target location. Therefore, the RF signals do not affect the body at any other location.