This is the most common question asked about acupuncture (besides, “What is acupuncture?”) because many people associate needles with pain. Acupuncture needles are about the thickness of a dog’s whisker, so they are virtually painless when inserted. Most people feel a light tap when the needles are applied. You may feel warmth, heaviness, tingling or pressure around the needle. These sensations are normal and desirable. Should you experience any discomfort, inform the practitioner, and they will adjust the needles accordingly. All needles are disposable.