Traditional acupuncture is a healthcare system that originated in ancient China over 2000 years ago. It is based on principles of balancing the body's energy to maintain health and treat illness. The first known book on Chinese medicine dates back to between the 1st century BC and 1st century AD and all styles of acupuncture practiced today trace their roots to this text. Traditional acupuncture gained prominence again in China in the 1930s and 1940s when it was used successfully to treat wounded soldiers. It is now practiced worldwide and clinical trials are confirming its efficacy as a recognized healthcare option.