The analgesic (pain-relieving) effects of cryotherapy are related to three specific changes in the body.
First, the nerve signal transmission is slowed. Reducing the amount of nerve signals getting through to the brain might relieve pain in some individuals.
Second, nor-epinephrine levels increase after cold immersion. This stress-induced chemical reduces pain sensitivity as a protective mechanism in times of life-or-death situations.
Lastly, Cryotherapy treatments can reduce pain intensity and frequency by reducing inflammation. Arthritic joints, frozen shoulders, muscle injuries and other types of painful conditions have all been found to benefit from Cryotherapy.