Physiological terms of the intersection of heart and kidney. It is a theory related to viscera. The heart belongs to the fire, hiding the god; Kidney belongs to water, storing essence. The two viscera interact and restrict each other to maintain normal physiological activities. The rising of kidney yang can warm and nourish the heart fire; Heart fire can control kidney flooding and help true yang; Kidney water can also control the heart fire, so that it will not be too excited, which is beneficial to the heart yin. This relationship, also known as the combination of fire and water. The heart belongs to fire, living in the upper jiao, hiding the gods, and being the yang in the yang; Kidney belongs to water, located in the lower jiao, and mainly stores essence, that is, yin and viscera in yang. They are fire and water, Gigi, and the interaction of Yin and Yang. They are spiritually related and closely related. The theoretical system of the intersection of heart and kidney is mainly developed from the theory of fire and water rising and falling of yin and yang and five elements. The formation and development of the theory of the intersection of heart and kidney discussed the rise and fall of fire and water as early as Neijing, which laid the foundation for the formation of the theory of the intersection of heart and kidney. "Su Wenyin Yang Ying Xiang Da Lun" said: "Heaven and earth, everything is up and down; Fire and water are signs of yin and yang. " Explain the relationship between heaven and earth, yin and yang, fire and water. "On Su Wen Liu Weizhi" said: "Ascending means descending, descending means sky, descending means ascending, ascending means earth, sky means descending, qi flows to the earth, earth means ascending, and qi rises to the sky." The natural law of fire and water rising and falling between yin and yang between heaven and earth is explained from the cosmic scope, which lays a theoretical foundation for the decline of heart fire and the rise of kidney water in the future. China Tibetan Scriptures put forward the view that "fire and water intersect and yin and yang correspond, which means peace", and pointed out that it is normal for yin and yang to intersect and correspond. Later physicians also developed the theory of the intersection of heart and kidney. Zhou Shenzhai in Ming Dynasty said: "Kidney water has true yang, and heart fire has true yin." Applying the theory of heart and kidney qi to clinic, we get the experience that "if you want to strengthen your heart, you must first strengthen your kidney, and if you want to strengthen your kidney, you must first calm your heart". Zhu Danxi's "Gezhi Public Opinion" in the Yuan Dynasty said: "People are alive, their hearts are on fire, and their kidneys are on water. The knife cuts bread and fingers. He rises and falls, there is no poverty, so business exists. " Fu Qingzhu gynecology department in Qing Dynasty said: "If there is no fire in the kidney, it is Shui Han;" Heart without kidney water is hot; If the heart is nourished by kidney water, the kidney will be warmed by heart fire. " Specifically, it is pointed out that only when the heart and kidney are connected from top to bottom and fire and water are combined can the coordination and balance of the body be maintained. The theoretical concept and mechanism of the intersection of heart and kidney: the heart belongs to fire, the kidney belongs to water, and the heart yang helps the kidney to help water, so it is called "fire and water ji ji" or "the intersection of heart and kidney". The yin and yang, fire, water, qi, blood and body fluid between the heart and kidney all intersect by gasification to maintain the dynamic balance of human life activities. Spleen and stomach hub: the heart is fire, there is water in the fire, the kidney is water, there is fire in the water, the true yin in the kidney rises to the heart, and the heart yang falls to the kidney. The spleen is the Taiyin leading to ascending, the temper leading to ascending liver and kidney qi, the stomach leading to descending Yangming, and the spleen and stomach are the pivot for harmonizing fire and water, and the auxiliary for ascending and descending Jin Mu. The significance and connotation of the intersection of heart and kidney: the heart controls blood and stores essence, the kidney controls bone to produce marrow and store essence, and the normal intersection of heart and kidney maintains normal life activities of human body. Essence and spirit are indispensable and important substances in human life activities, and spirit is mutually utilized, and there are many contents in the intersection of heart and kidney. ① Homologous exchange of heart and kidney essence and blood Homologous exchange of heart and kidney essence and blood refers to Shui Gu's subtle essence, whose essence and blood originate from the spleen and stomach, and the heart blood circulates in the kidney and combines with kidney essence to form essence; Kidney essence enters chong ren, turns into heart, and merges with heart blood into blood. ② Interaction between mind and kidney essence. The heart is the master of human life activities, and the kidney is the basis of human life activities. Kidney stores essence to give up spirit, essence can produce marrow, and marrow gathers brain to nourish spirit. Essence is the home of God, God is the image of essence, essence is the material basis of God, and God is the external expression of essence. The two use each other and depend on each other in spirit. (3) The monarch fire of life brings out the best in each other. Heart governs fire and kidney governs fire. Fire is the sun spirit in the upper layer, and fire is the root of the sun spirit in the lower layer. Monarch fire is the command of life fire, and life fire is the foundation of monarch fire. The normal functional activities of the tissue structure of human internal organs depend on the command of the imperial fire and the warmth of the fire of life. ④ Heart fire and kidney water restrict each other. The heart belongs to yang in the chest, the five elements belong to fire, the abdomen belongs to yin, and the five elements belong to water. The relationship between heart and kidney is the relationship between yin and yang and fire and water. Under physiological conditions, heart fire descends on kidney, warming kidney yin with kidney yang, and making kidney water cold; Kidney water helps the heart, making the heart weak. ⑤ The mutual help of vitality and painstaking efforts is the driving force to maintain human life activities. Primitive qi is mainly produced by the essence stored in the kidney and depends on the essence in the kidney. The heart governs the blood, which not only needs the promotion of painstaking efforts, but also depends on the promotion and stimulation of vitality. In fact, the intersection of heart and kidney includes heart and kidney, qi and blood, yang and qi, yin and essence, yin and yang regulation, etc., which is the mutual communication between the whole heart and kidney. In a word, the intersection of heart and kidney means that the spirit, qi and blood and between fire and water of heart and kidney support and restrict each other, and * * * maintains the dynamic balance of yin and yang of heart and kidney. Including the homologous interaction of heart, blood, kidney and essence, the mutual use of heart and kidney essence, the complementarity of monarch, life and fire, the mutual restriction of heart, fire, kidney and water, and the interaction of primordial energy and painstaking efforts. Furthermore, the heart governs the gods as the master of the internal organs, and the kidney governs the storage of essence as the innate foundation. The coordination and mutual balance of heart and kidney function play a leading role in the whole body's life activities. A deep understanding of the significance of heart-kidney intersection is of great guiding significance for clinical treatment of diseases and syndromes caused by heart-kidney intersection.