This book systematically describes the fundamental theories of Tradi¬tional Chinese Medicine (TCM). It outlines the basic concepts and theories of TCM, such as yin-yang, the five elements, qi (vital energy), blood and body fluids, pathogenesis, pathology, the four diagnostic tech¬niques, the eight guiding principles, differentiation of syndromes and ge¬neral rules of prevention and treat¬ment. Shuai Xuezhong, the author and translator of the book, is an associate professor and director of the English ¬TCM Teaching and Research Section at the Hunan College of Traditional Chinese Medicine.