Acupuncture needles are not much thicker than a human hair with a very smooth surface. Most people generally feel little sensation other than the therapist’s fingers pressing and feeling for the precise acupoint. Occasionally needle insertion can feel like a pinch which is momentary. Tingling and numbness and heaviness in the local area is a sensation that the acupuncturist may elicit to produce a specific effect. Once inserted they are left for a time and as the treatment proceeds there is usually an increasing sense of relaxation and subtle warmth throughout the body. Many recipients feel deeply relaxed and often fall asleep.