China was one of first countries to have a medical culture. In comparison with Western medicine, the Chinese method takes a far different approach. With a history of 5,000 years, it has formed a deep and immense knowledge of medical science, theory, diagnostic methods, prescriptions and cures.
The basic principles of Chinese medicine are rather distinctive:

Relative Properties - Yin and Yang
The Physiology of Chinese medicine holds that the human body's life is the result of the balance of yin and yang. Yin is the inner and negative principles, and yang, outer and positive. The key reason why there is sickness is because the two aspects lose their harmony. Seen from the recovery mechanism of organs, yang functions to protect from outer harm, and yin is the inner base to store and provide energy for its counterpart.

Basic Substance
Doctors of Chinese medicine believe that vital energy - moving and energetic particles, state of blood, and body fluid are the essential substances that compose together to form the human body, and the basis for internal organs to process. They are channeled along a network within the body - Jing Luo as their channels. On the physical side, vital energy serving to promote and warm belongs to the properties of yang, and blood and body fluid to moisten possesses the properties of yin.