According to traditional Chinese medicine, the body has more than 2,000 points where needles can be inserted. They are connected by pathways or meridians, which create a flow of energy called Qi (pronounced “chee”). Stimulating these points is said to correct the imbalance of qi and improve the flow of energy.
It's said that the effects come from stimulating the central nervous system. This may trigger the release of chemicals into the muscles, spinal cord, and brain. These chemicals either alter the experience of pain or produce bodily changes that promote a sense of well-being.