Cryotherapy diminishes the inflammatory reaction to trauma and reduces edema, hematoma formation and pain. During the rehabilitation period, cold application enables the patient to develop strength and mobility in an injured area, with minimal inflammation and discomfort. Heat potentiates the body's inflammatory reaction to trauma and results in increased discomfort. Cryotherapy should be used initially and heat should be reserved for improving mobility and absorbing hematomas after all inflammation has subsided.