Acupuncture acts through manual pressure or the insertion of a very fine needle on points in the meridians to correct energy blockages and help improve metabolic processes such as digestion, absorption, and drainage, etc. According to modern science, acupuncture stimulates the nervous system to release chemicals that change the experience of pain. The WHO has shown that it is an effective modality for the treatment of, among other things, postoperative, sciatica, osteoarthritis pain.