Thermotherapy is the application of heat to treat injuries and illnesses. Status improves the thermal injury by agents, that are at different degrees of heat, on the body. The therapist may perform Thermotherapy surface or deep thermotherapy. The surface is one in which the degree of penetration is low either infrared or reflex mechanisms. Is profound biological effects when given to directly heat the deeper tissues. Depending on the kind of thermotherapy, heat can be applied by radiation, conduction or convection. It is particularly suitable for rheumatic and chronic cramping and increasing the elimination of toxins.