Yin-Yang school thought is one of the most representative theories in ancient China. The combination of yin and yang, five elements and qi constitutes China's ancient philosophical thought system. It is the cornerstone in the field of traditional Chinese medicine. According to the basic properties of Yin and Yang in the theory of Yin and Yang, there are exterior syndrome, heat syndrome and excitement, irritability, hyperactivity and brightness in clinic. And the symptoms are outward, upward and easy to find; The essence of pathogenic factors is that yang causes disease and the condition changes rapidly. Generally, it can be attributed to yang syndrome. Internal syndrome, cold syndrome and deficiency syndrome of depression, quietness, senility and astringency; And the symptoms are internal, downward, and difficult to find; The pathogenic nature of the disease is yin evil, and the condition changes slowly, which can be attributed to yin syndrome.

The theory of five elements is an ancient philosophical thought, which studies the concepts, characteristics, laws of birth, restraint and abuse of the five elements of wood, fire, earth, water and gold, and is used to explain the occurrence, development, change and relationship of all things in the universe. It belongs to the category of China's ancient materialism and dialectics. According to the theory of five elements, everything in the universe consists of five basic substances: wood, fire, earth, gold and water. The development and changes of various things and phenomena in nature are the result of the constant movement, mutual resistance and interaction of these five substances. The characteristics of five elements are the basic basis for identifying the attributes of five elements of various things. Clinical dialectical five behaviors:? Water is moist, fire is inflamed, wood is straight, gold is leather, and soil is food? It is a classic summary of the characteristics of the five elements. Chunsheng, Xiarong, Qiushou and Dongcang are called the four seasons, describing the world? Life, growth, culture, harvest and concealment? Natural change.

Influenced by the order of four seasons and the concept of yin-yang rotation, it has been formed in acupuncture and pulse diagnosis. Four-time pulse method With what? Four o'clock? Acupuncture method based on theory. The theory of yin and yang has a special expression in the field of ancient medicine, that is, Taiyin, Shaoyin, Jueyin, Taiyang, Shaoyang and Yangming, which are composed of three parts. It plays an important role in syndrome differentiation and treatment.