Acupuncture pins are hair thin. In fact, they are thinner than a Cat's Whiskers. You will usually feel a little sting when the pins are inserted. After the insertion of the acupuncture pins you will feel a very unique sensation. Each person may experience different sensations, but the most common sensations: heaviness, tingling, numbness, aching, soreness, warmth or nothing at all. Should you experience any discomfort, inform the Acupuncturist and they will adjust the pins accordingly. When performed by a trained licensed professional, acupuncture is extremely safe. Only sterile and disposable pins are used here at Acupuncture Chiropractic. With Acupuncture you get SIDE BENEFITS not side effects!