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Acupuncture needles are solid, very thin, flexible, and smaller than even the smallest hypodermic or sewing needles. Their insertion is often not felt. Once a needle reaches the appropriate depth, you may feel a dull, mild ache or tingling sensation. It is a sign that the acupuncture point is being activated and is a good sign. Some patients also describe feeling a warm or electrical sensation, but you should never feel pain. If you do, please let the doctor know.