Huangdi Neijing (simplified Chinese: 黄帝内经; traditional Chinese: 黃帝內經; pinyin: Huángdì Nèijīng), literally the Inner Canon of the Yellow Emperor or Esoteric Scripture of the Yellow Emperor, is an ancient Chinese medical text or group of texts that has been treated as a fundamental doctrinal source for Chinese medicine for more than two millennia. The work comprises two texts—each of eighty-one chapters or treatises in a question-and-answer format between the mythical Yellow Emperor and six of his equally legendary ministers. The first text, the Suwen (素問), also known as Basic Questions, covers the theoretical foundation of Chinese Medicine and its diagnostic methods. The second and generally less referred-to text, the Lingshu (靈樞; Spiritual Pivot), discusses acupuncture therapy in great detail. Collectively, these two texts are known as the Neijing or Huangdi Neijing. In practice, however, the title Neijing often refers only to the more influential Suwen. Two other texts also carried the prefix Huangdi Neijing in their titles: the Mingtang (明堂; Hall of Light) and the Taisu (太素; Grand Basis), both of which have survived only partially. The book was popular among Taoists. Source: Wikipedia (en)