The ABC of Chinese Medicine Theory 

The basic theory of the Chinese medicine attempts to explain the nature of life cycle and disease changes. It includes five theories: Yin and Yang, the five-elements, how to direct one's strength, internal organs of the body, and channels. It also researches dialectics, explanations why diseases occur, how to diagnose and prevent diseases, as well as how to keep the body healthy.

The concept of Yin and Yang derived from an ancient philosophical concept. After observing the phenomenon, ancient people grouped all conflicting ideas into Yin and Yang. They used this concept to explain how things changed. Chinese medicine used Yin and Yang to illustrate the complicated relationship between various things such as the different parts of the human body and living things vs. nature or society. It was believed that the relative balance of Yin and Yang served as the basis to maintain the normal activities of the human body. If such a balance was disturbed, diseases occurred, thus affecting people's health.
The theory of directing one's strength focused on how various components such as astronomy, meteorological phenomena and climate would affect health. This theory consisted of two parts, five strengths and six climatic factors. The five strengths, namely the strengths of metal, wood, water, fire and earth, refer to the different seasons of the year such as spring, summer, long summer, autumn and winter. People regarded wind, coldness, summer, rawness, dryness and fire as the six elements of the climate. This theory tried to predict climatic change and how disease occurred by parameters in astronomy.