Over the course of several thousand years, with a long history of continual development and enhancement, Traditional Chinese Medicine (TCM) has become a unique Chinese medical system with significant success in the field of healthcare, making great contributions to the well-being of mankind. The Essential Chinese Medicine book series fulfills the mission of honouring life and promoting the health of family members and friends. This series develops and expands on the essence of TCM to advocate new concepts of health and wellness. The editors-in-chief, Professor Zhang Bao Chun and Associate Professor Chen Yu Ting, have been involved in the teaching, research and clinical work of the TCM theoretical system for a long period of time. Both have not only mastered the ancient learning but have also blazed new trails. They have put forward assiduous efforts in the research and writing of materials, being the chief editors of several specialised academic publications and other teaching materials. This four-volume Essential Chinese Medicine series is the product of their extensive research.