Oncological Nanothermia or Oncothermia is a method of electromagnetic non-invasive modulated hyperthermia, adjuvant in the treatment against cancer, which promotes a natural regulatory process of the body. The brand Oncotherm® was founded in 1988 by Professor Dr András Szász, as an initiative for the development and research of the electro-hyperthermia method in the treatment of cancer.

Oncothermia is based on the method of hyperthermia, however, it differs from conventional hyperthermia. In addition to producing an absolute increase in the temperature of the deep tissue layers, oncothermia combines the action of a modulated electric field. It also uses a carrier frequency of 13.56MHz, which is generated by two active electrodes. This electric field allows an absorption of energy into the extracellular fluid (ECM), and the unbalancing and de-structuring of the cancer cell membrane. In this way, significant therapeutic effects are achieved at only 38ºC.