How large are the acupuncture needles?
Acupuncture needles are 25-50 times thinner than a hypodermicneedle. They are so thin that several acupuncture needles can go intothe middle of a hypodermic needle. There is little sensitivity to theinsertion of acupuncture needles.
While some people feel nothing at all; others experience a briefmoment of discomfort as the needle penetrates the skin that can befollowed by a mild sensation of cramping, tingling, numbness, travelingwarmth, or heaviness. The needles are left in place for twenty to fortyminutes. Most people find the experience extremely relaxing anduplifting and even fall asleep for the duration of the treatment.
That being said, some conditions will respond better to a thickergauge acupuncture needle. It is common to experience soreness duringand after an acupuncture treatment. It is important to let youracupuncturist know immediately so that they can make you morecomfortable. If you are sensitive to acupuncture or ‘needle-phobic’your acupuncturist can use thinner needles and be gentler. Be sure tospeak up and let the practitioner know how you are feeling! More…
Source: Acufinder.com