The needles are approximately the size of a cat’s whisker. The sensation caused by an acupuncture needles 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 needles are inserted, or a sensation of energy spreading and moving around the needle. This is called the “Qi sensation”. All these reactions are good and a sign that 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 and well-being.