Acupuncture is an ancient Chinese practice that involves inserting thin needles into the skin at precise points on the body to relieve pain and other health issues. It originated over 2000 years ago and was introduced to Europe in the 17th century. Modern research studies have found acupuncture can help reduce dental pain, arthritis pain, headaches, back pain, and side effects from cancer treatments, though evidence is still limited or inconclusive for other conditions. Potential risks include soreness, bruising, and rarely, organ injury or infection. The National Center for Complementary and Integrative Health continues to research how and why acupuncture may relieve pain and other health issues.