As long as Qi flows freely throughout the meridians, health is maintained. Disruption of he flow of Qi through the meridian results in pain and illness. The use of acupuncture can correct such disruption by shunting Qi to those areas where it is deficient and draining it from areas where it is excessive. The anatomy of selected points, patient size age and constitution all play a role in determining depth of needle insertion. In general, needles may be inserted from 0.5 to 1.5 cun in depth.
Acupuncture needles are very different from hypodermic needles sued for injections.
They are very fine and flexible and are usually barely felt when inserted. There are certain sensations associated with the therapeutic effects of acupuncture. These may include slight cramping, heaviness, distention, tingling or electric sensation traveling along a meridian. If any discomfort is experienced, it is usually mild. In North America, the majority of acupuncturists use presterilized, individually packaged, disposable acupuncture needles to assure absolute control over cross-infection.