Most people are surprised to learn that acupuncture needles are very thin. Unlike hypodermic needles used to give an injection, acupuncture needles are 20 to 50 times thinner, depending on the needle gauge. In fact, the thinnest acupuncture needle used is thinner than some human hair!
Acupuncturists attain a high level of skill in gently placing these tiny needles, and often the insertion is barely perceptible. You may feel a vague numbness, heaviness, electric sensation or slight tingling either around the needle or traveling up or down the affected meridian. After treatments, most patients feel very relaxed and refreshed. Many patients fall asleep during treatment.