This system of complementary medicine involves inserting small, fine needles into the skin and muscle tissues. It is used to alleviate pain and to treat various physical, mental, and emotional conditions. Originating in ancient China, acupuncture is now widely practiced in the West. The World Health Organization (WHO) recommends acupuncture as an effective treatment for over forty medical problems, including allergies, respiratory conditions, gastrointestinal disorders, gynecological problems, nervous conditions, stress and disorders of the eyes, nose and throat. Acupuncture has been used in the treatment of addiction and substance abuse. It is an effective and low-cost treatment for headaches and chronic pain associated with problems like back injuries and arthritis.