There is little sensitivity to the insertion of acupuncture needles. One reason is that acupuncture needles are 25 to 50 times thinner than needles that are used for injections and blood tests. While some patients feel nothing at all, others experience a brief moment of discomfort. More often than not, the discomfort is caused by the “Qi” making contact with the needles. I have heard patients describe this feeling as a mild sensation, tingling, cramps, heavy, floating, electricity, and numbness. It is different for everyone and certain needle sites are more sensitive than others. Most people find the experience relaxing, and some even fall asleep during session.