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Acupuncture needles are as thin as a human hair, far thinner than a sewing needle or large hollow hypodermic  needle used for injections.

needle

The response if often described and a tingling sensation, warming sensation, dull ache, heaviness or no response at all.

 

Pictures showing size of needle relative to a match and sewing needle and placed on human hand.

 

acupuncture-needle