The needles are approximately the size of a cat’s whisker. The sensation caused by an acupuncture needle varies. You may experience a vague numbness, heaviness, tingling or dull ache where the acupuncture needle has been inserted. Sometimes people experience a little pain as the needle is inserted, or a sensation of energy spreading and moving around the needle. All these signs are good and a sign the treatment is working. The depth of insertion varies from person to person. After treatment you may feel energized or may experience a deep sense of relaxation