When the acupuncture goes through your epidermis, which is your skin, it sends a signal up to the brain, via your nervous system, where your pain is perceived.
The powerful healing effects of acupuncture comes because of it getting underneath the skin. As soon as anything foreign enters the body, via mouth, nose, skin, ears, the white blood cells start to attack and help heal the area. If it were a foreign substance, refined sugar for example, this would send your adrenals into overdrive, knocking out your immune system for around 4-6 hrs, which in turn impairs the cardiovascular and the nervous system.
As acupuncture is not a harmful foreign substance to the body, healing effects are heightened on our whole interconnected self.
Coupling acupuncture with lifestyle adjustments, ensures we get to the root of the problem, enhancing the healing effects and giving us a higher probability of the pain staying away.