By the opposition between Yin and Yang is meant that all things or phenomena in nature have two opposite aspects-Yin and Yang, such as heaven and earth, motion and quiescence, ascending and descending, exiting and entering, day and night, heat and coldness and so on. 

The unity is the outcome of mutual opposition and restriction between Yin and Yang. Without opposition, there would be no unity; without mutual opposition, there would be no mutual complement. It is only through this kind of opposition and restriction that the dynamic equilibrium can be established. 

For instance, in the nature world, the motions of celestial bodies, the variations of the four seasons, the alternations of days and nights, as well as sprouting in spring, growing in summer, reaping in autumn and storing in winter, are all the concrete manifestations of the unity of opposites between Yin and Yang. For information about Degenerative Arthritis, continue to read Degenerative Arthritis Pills. 

TCM believes that the normal physiological functions of the human body result from the opposite and unified relationship between Yin and Yang. Both of them are always in a state of dynamic balance. Even under normal physiological conditions of the human body, Yin and Yang cannot be in a state of absolute balance, but in a state of relative balance. 

If, for any reason, the relative balance is destroyed, there is bound to be excess or deficiency of Yin or Yang, and then a disease will arise. As is stated in Su Wen , "Yin in excess causing Yang disease, while Yang in excess leading to Yin disease." It is precisely due to the unity of opposites between Yin and Yang that all things can develop and change ceaselessly and the natural world is perpetually full of life.

Article source: chinadaily