When the channels of the body have free-flow of qi and blood after an acupuncture, patients often see improvement in symptoms.
During the acupuncture procedure, filiform, sterile, stainless steel needles are used to regulate the flow of qi and blood in the channel system. Unlike hollow hypodermic needles such as are used to inject medication or to draw blood, acupuncture needles are very thin, solid, and rarely cause bleeding. They are usually painless on insertion. Sensations from manipulation of the channels during acupuncture are sometimes described by patients as a temperature change, a dull ache, or a twitch. These sensations are the result of qi movement around the needle.
When the channels of the body have free-flow of qi and blood after acupuncture treatment, patients often see improvement in symptoms. Opening and regulating the channels is analogous to a dam being removed from a river: the ecosystem of that river is restored, and life returns to the landscape downstream.