YIN-YANG

 exposed to the sun belongs to Yang  unexposed to the sun belongs to Yin origin of yin-yang

阳 阜＋日＋勿 阴 阜＋今＋云

Yin-Yang is a summary of distribute of two opposite aspects of correlative things or phenomena in the universe. A basic theory of opposition, dependence, wane-wax and transformation of Yin and Yang is summarized to understand and explain the existence and changes of things in the whole universe.

TCM takes water and fire as symbols of Yin and Yang.

yang warm and hot brightness excitement flare up external motion formless yin cool and cold cloudiness inhibit flow down internal stillness formed

there are always two opposite aspects of Yin and Yang in all things or phenomena. In nature, for example, heaven and earth, interior and exterior, motion and stillness. ⑴ Yin-Yang doctrine ① Opposition and restriction between Yin and Yang

 Neither of them an exist by its own without the other. Yin must relies on Yang, and Yang on Yin, each of the two aspects presupposes the existence of the other. ② Interdependence of Yin and Yang

 ③ Balance on wane-wax of Yin and Yang  upper limit   lower limit   normal abnormal 

 ④ Inter--transformation of Yin and Yang Yang yin

⑤ Infinite Divisibility of Yin and Yang It is believed that the positive and the negative aspects of a thing are both opposite to and dependent on each other, or so called “oppositing and complementing to each other”, and everything in the universe is ever in motion and changeable.

⑵ Application in TCM

 ① Organic Structure  yang yin  position ： upper lower  exterior interior  front or anterior back ordorsal  zang-fu ： fu organs zang organs  Organs  meridians: exterior interior  ② physiological function

  ③ pathological changes   balance excessive yang excessive yin

 ④ diagnosis   ⑤ treatment