What Is Acupuncture and How Does It Work?

Sixteenth century Chinese doctors believed that illness was due to an imbalance of energy in the body. In acupuncture, disposable, stainless steel needles are used to stimulate the body's 14 major meridians, or energy-carrying channels, to resist or overcome illnesses and conditions by correcting these imbalances.

Acupuncture is also thought to decrease pain by increasing the release of chemicals that block pain, called endorphins. Many acu-points are near nerves. When stimulated, these nerves cause a dull ache or feeling of fullness in the muscle. The stimulated muscle sends a message to the central nervous system (the brain and spinal cord), causing the release of endorphins (morphine-like chemicals produced in our own bodies during times of pain or stress). Endorphins, along with other neurotransmitters (body chemicals that modify nerve impulses), block the message of pain from being delivered up to the brain.

Adapted from:

http://www.webmd.com/rheumatoid-arthritis/guide/arthritis-acupuncture

How Acupuncture Pierces Chronic Pain

Millions of people worldwide use acupuncture to ease a variety of painful conditions, but it’s still not clear how the ancient treatment works. Now a new study of mice shows that insertion of an acupuncture needle activates nearby pain-suppressing receptors.

report  in Nature Neuroscience
http://news.sciencemag.org/sciencenow/2010/05/how-acupuncture-pierces-chronic-.html