You don't have to massage the part of the body that hurts most. If you're shy about letting a friend touch your aching lower back, for instance, she could help by massaging your shoulders instead. This is because massage creates chemical changes that reduce pain and stress throughout the body. One way it does this is by reducing a brain chemical called substance P that is related to pain. In a TRI study, for example, individuals with a form of muscle pain called fibromyalgia showed less substance P in their saliva (and they reported reduced pain) after a month of twice-weekly massages.
