Hyperthermia is a rapidly developing treatment method in tumor-therapy. The classical effect is based on well-focused energy absorption targeting the malignant tissue. The treatment temperature has been considered as the main technical parameter. Unfortunately, the heat-shock protein (HSP) synthesis may considerably suppress the treatment's efficiency, adapting cells to survive the shock.Electro-hyperthermia heats up the targeted tissue by means of electricity, producing less HSP-synthesis in the cells than a usual hyperthermia process. The main idea is to keep the energy absorption in the extracellular liquid and, by heating it, increase the ion-mobility, intensify the metabolic rate of the cells, and destroy the cell membrane before the heat-shock activates the intra-cellular HSP mechanisms.