Cryotherapy is the rapid and controlled cooling of the tissue, and it dates back all the way to 2500 BCE when the Egyptians used cold to treat injuries and inflammation. The process triggers the bodies survival mechanisms (fight or flight), thus releasing feel-good endorphins, anti-inflammatory protein norepinephrine, and causes rapid circulation of blood flow.  Capillaries expand up to four times the normal amount enabling white blood cells to access and heal injuries faster.  The result is improved skin elasticity and texture, reduced inflammation and pain, and a nice boost of energy. Cryotherapy is especially beneficial in the treatment of arthritis.