Massage is generally considered a complimentary or alternative medicine by insurance companies, but it's benefits are being studied more because of such positive results in patient populations.

Massage is an effective therapy in reducing stress, pain, and muscle tension. Massage is also helpful in treatment of the following:

-Sports Injuries
-Pain management
-Digestive Disorders
-Insomnia related to stress

American Massage
Therapy Association

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The American Massage Therapy Association or AMTA is a non-profit professional organization for the massage therapy community.  They help to promote massage through valid research.  

Massage Research