Hyperthermia therapy is a type of medical treatment in which body tissue is exposed to slightly higher temperatures to damage and kill cancer cells or to make cancer cells more sensitive to the effects of radiation and certain anti-cancer drugs. Techniques that may bring local tissues to quite high temperatures, such as radio frequency ablation, are not usually what is meant by "hyperthermia." When combined with radiation therapy, it is called thermoradiotherapy. Whole-body hyperthermia has also been found to be helpful for depression. It is also used in the treatment of Lyme disease.