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Banner for Classics of Traditional Chinese Medicine from the History of Medicine Division, National Library of Medicine. An online version of an exhibit held at the NLM, Nationals Institutes of Health, Bethesda, MD October 19, 1999-May 30, 2000.

Books on Display

Chinese Medicine in Korea and Japan

Yin and Yang

Emperors and Physicians


Yin and Yang

Yin and Yang are the underlying principles of Chinese philosophy and medicine. Good health is believed to come from a balance of Yin (negative, dark, and feminine) and Yang (positive, bright, and masculine).

Yin and Yang diagram with the yin in blue and yang in red. Below the words yin and yang are the descriptive principles of the words.
Source: Li CL. A brief outline of Chinese medical history with particular reference to acupuncture.
Perspect Biol Med. 1974 Autumn;18(1):132-43.