In
ancient China, the initial meaning of "yin" and "yang"
was very simplistic, signifying the side where the sun shone and the shadows.
"Yang" refers to the side facing the sun and "yin"
refers to the side with its back to the sun. Later, it evolved to express
heaven and earth, the sun and moon, day and night, fire and water as opposites.
Heaven is classified as "yang" while earth is classified as
"yin", fire is representative of "yang" while water
is representative of "yin", etc. In the theory of "yin-yang",
all things in the universe exist in corresponding opposite states of "yin"
and "yang" and there are different aspects exist within everything.
The two are polar opposites because one would not exist if the other
is absent. The state of body is determined by the balance of Yin and
Yang. Where there is an unbalance, external agents can invade the body
and cause disease. These external agents are called pathogens. As the
natural force return to a normal balance, the disease is then cured.
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