Acupuncture is surprisingly gentle for most people, although everyone experiences things differently. Most people find treatments quite relaxing - many even fall asleep. The needles are very fine, like a human hair. You may feel a prick or a pinch as the needle is inserted in some points. You may experience a heavy sensation, a dull ache, or a tingling feeling at the needle site or along the course of the channel. This is not painful and is a good sign which shows that the needle is working with your body's qi.