The scientific explanation:
Acupuncture releases endorphins, the body's natural pain killers
Acupuncture stimulates the secretion of endorphins. These natural pain killers block pain sensation and reduce nerve inflammation without the harmful side effects of opiate drugs. Endorphins also produce a sense of well-being which can help to reduce stress.
Acupuncture increases circulation and relaxes muscles
Acupuncture helps microcirculation, inside and outside the cells, allowing for a healthier cellular state to exist. It increases blood flow to the muscles and breaks the cycle of muscle spasms.
Acupuncture breaks up scar tissue and helps healing
Post surgical acupuncture stimulates blood flow to the site of the scar, promotes healing to the injured area and decreases the buildup of scar tissues.
The classical Chinese explanation:
Acupuncture improves circulation and and removes blockage
Pain is the blockage of chi -- vital energy, and blood in the energy channels called meridians.
These channels carry rivers of energy that traverse the body, bringing nourishment to the muscles,
tissues and organs. An obstruction to the
movement of vital energy in one part of the body is like a dam backing up a river, restricting flow to other areas.
Acupuncture unblocks the obstructions and increases the normal flow of energy through the channels relieving pain and restoring balance to the body systems.