Massage works muscles and joints and stimulates circulation as well as natural endorphins. By doing so it relaxes tension within the muscles and helps to stimulate the lymphatic system as well which helps eliminate toxins from the body. It affects the body in an emotional, physical, and psychological manner to help alleviate discomfort and pain associated with those areas. By reducing the stress it adds to your overall health as well.
The point of massage is to nurse soft tissue back to health, manually, and in some cases, to stimulate neurons or reduce retained fluid.