The dialectical theory of yin and yang is still of great significance in modern development. Nowadays, medical treatment is more inclined to traditional Chinese and western medicine, improving diagnostic techniques and promoting Chinese culture. Dialectics of Yin and Yang is the basic method of TCM diagnosis and treatment of diseases. ? A person's illness must be rooted in yin or yang. Although there are many lesions, what is the first principle? . The diseases in the world are ever-changing, but they are nothing more than yin and yang. The dialectics of yin and harmony also guides us to preserve health and prevent diseases. Dialectics is based on the dialectics of the eight cardinal principles. In addition, there are etiology syndrome differentiation, six meridians syndrome differentiation, Wei Qi Ying Xue syndrome differentiation, triple energizer syndrome differentiation and so on, which belong to exogenous diseases. Syndrome differentiation of zang-fu organs, meridians, qi, blood and body fluid belongs to miscellaneous diseases. ?

Eight-outline syndrome differentiation is to divide various diseases into eight types: yin, yang, exterior, interior, cold, heat, deficiency and excess, which is the theoretical basis of syndrome differentiation and treatment. Eight kinds of diseases are obtained by comprehensive analysis of some data obtained by doctors after four visits to patients, according to the physical strength of patients, the ups and downs and nature of diseases, and the depth of diseases. Clinically, based on this, TCM syndrome differentiation is carried out.

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. Yin-yang syndrome differentiation also includes specific dialectical contents, mainly including Yang deficiency syndrome, Yin deficiency syndrome, Yin excess syndrome, Yang excess syndrome and critical illness. In addition, Yang Can's syndrome of hyperactivity of yang and excess syndrome are also pathological changes of yin-yang imbalance. The so-called yin syndrome actually refers to excess cold syndrome, and the so-called yang syndrome actually refers to excess heat syndrome.