Shiatsu (指圧 Japanese from shi, meaning finger, an atsu, meaning pressure) is a traditional Japanese hands-on therapy based on anatomical and physiological theory and is regulated as a licensed medical therapy with the Ministry of Health and Welfare in Japan. Shiatsu is an evolving form. Various styles (called Derivative Shiatsu) incorporate (to differing degrees) aspects of Japanese massage traditions, Chinese Medicine practice, and "Western" anatomy and physiology.