THE TRADITIONAL CHINESE MEDICINE THEORY
Yin and yang are ancient Chinese concepts which can be traced back to the Shang dynasty (1600–1100 BCE). They represent two abstract and complementary aspects that every phenomenon in the universe can be divided into.Primordial analogies for these aspects are the sun-facing (yang) and the shady (yin) side of a hill. Two other commonly used representational allegories of yin and yang are water and fire.​
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Strict rules are identified to apply to the relationships between the Five Phases in terms of sequence, of acting on each other, of counteraction, etc. All these aspects of Five Phases theory constitute the basis of the zàng-fÇ” concept, and thus have great influence regarding the TCM model of the body. Five Phase theory is also applied in diagnosis and therapy.
