There are number of ways massage may help in controlling pain.
Massage confuses the body's pain signals .
Pain impulses run toward the spinal cord and then up the cord and into the brain. It's only when they reach the brain that these impulses, are perceived as pain. When you rub, it sends other impulses along the same nerves. When all these impulses try to reach the brain through nerves, the nerves get clogged like a highway during morning rush hour. Most of them won't reach the brain.