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Hospitals around the country are incorporating formal and informal laughter therapy programs into their therapeutic regimens.
Laughing is found to lower blood pressure, reduce stress hormones, increase muscle flexion, and boost immune function by raising levels of infection-fighting T-cells, disease-fighting proteins called Gamma-interferon and B-cells, which produce disease-destroying antibodies. Laughter also triggers the release of endorphins, the body's natural painkillers, and produces a general sense of well-being.
Mayo Clinic (Mayo Clinic Health Letter, March 1993) reports that laughter aids breathing by disrupting your normal respiration pattern and increasing your breathing rate. It can even help clear mucus from your lungs.
Laughter is also good for your heart. It increases circulation and improves the delivery of oxygen and nutrients to tissues throughout your body.
A good laugh helps your immune system fight off colds, flu and sinus problems by increasing the concentration of immunoglobulin A in your saliva. And it may help control pain by raising the levels of certain brain chemicals (endorphins).
Furthermore, it is a natural stress reliever.
Reference: holisticonline.com/Humor_Therapy/humor_therapy.htm