Whole Body Hyperthermia is a medical procedure that involves raising the core body temperature systematically. This elevation in core body temperature has several effects on the body, including an acceleration and improvement in various functions. Most notably, it activates and enhances the immune system, making it more active and aggressive. Additionally, enzymatic activity increases significantly, making the immune system a potent weapon against cancer. Furthermore, cancer cells are less able to withstand high temperatures compared to normal cells, making them more vulnerable to attack and destruction by the immune system.

As for its safety, Whole Body Hyperthermia is considered safe because it capitalizes on the body's natural defense mechanism, fever. Fever is a physiological response that raises the body's temperature to combat infections and other processes, including cancer. Normal cells can tolerate elevated temperatures without harm, whereas cancer cells, which are already metabolically compromised, are more susceptible to the effects of fever.

Whole-Body Hyperthermia is effective against cancer for several reasons. First, it strengthens the immune system, enabling it to more aggressively target cancer cells. Second, it makes cancer cells more susceptible to damage due to the metabolic effects of higher temperature and increased oxygen saturation produced by hyperthermia, similar to what happens during a fever. In essence, medical hyperthermia mimics the body's natural defense system to regain control over abnormal cellular behavior.