Promotion in the five elements may be used to explain the inter-promotion relationships among the five Zang-viscera. Restriction in the five elements may be used to expound the inter-restriction relationships among the five Zan viscera.

(2)Inter-affection disorders of the five Zang-viscera
The five elements not only can be used to explain the relationships among the viscera physiologically, but also may be used to explain interaffection of the viscera pathologically. This relates to the laws of promotion, restriction, subjugation and violation of the five elements.

(3)Diagnosis and treatment application
Abnormal changes in functional activities of the viscera and their relationships can all be reflected in the complexion, voice, taste and pulse. For example, a patient whose complexion is greenish with a preference for sour food and a wiry pulse may be diagnosed as having a liver disease.

In addition, the onset and development of some diseases are related to the promotion and restriction relationships among the viscera. Thus in treatment while treating the diseased viscus, one should also consider the other related viscera in order to stop transmission of disease. Examples might include treatment principles such as reinforcing earth to strengthen metal.