Acupuncture needles in a patient's back and neck. The needles stimulate acupuncture points, and are believed to cause the release of endorphins, the b

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Acupuncture needles in a patient's back and neck. The needles stimulate acupuncture points, and are believed to cause the release of endorphins, the body's natural painkillers.

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Size: 3838px × 3141px
Photo credit: © OSCAR BURRIEL/SCIENCE PHOTO LIBRARY / Alamy / Afripics
License: Licensed
Model Released: No

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