There are thousands of books on Chinese Medicine. Below are just a few that many people have felt were worthy of exploration.
The Web that Has No Weaver: Understanding Chinese Medicine, by Ted Kaptchuk
This is a classic, often used as a textbook for introductory classes in Chinese Medicine. Considered a bit dense by many, it has singularly beautiful descriptions of Yin, Yang, Jing, Qi and Shen.
Wood Becomes Water: Chinese Medicine in Everyday Life by Gail Reichstein
Lacks the depth of “The Web” but makes up for it in immediate accessibility. Focus is on working with the Five Elements. A great first book, especially for people approaching the Five Elements from a Qigong perspective.
Between Heaven and Earth: A Guide to Chinese Medicine by Harriet Beinfield and Efrem Korngold