The heart is yang, located on the diaphragm, belonging to yang and fire; The kidney is located in the lower jiao and belongs to yin and water. The relationship between heart and kidney is mainly manifested in the intersection of Yin and Yang and the relationship between fire, water and ji ji.

Physiologically, the heart fire must go down to the kidney to support the kidney yang to warm the kidney water, so that the kidney water is not cold; Kidney water must go up to the heart, support the heart yin to conserve the heart yang, so that the heart fire is not prosperous, thus maintaining the harmonious balance of the heart, kidney and even the whole body. Traditional Chinese medicine calls this relationship between heart and kidney "intersection of heart and kidney" and "fire and water ji ji".

As "Fu Qingzhu Gynecology" said: "The fire of the heart without kidney is Shui Han, and the water without kidney is blazing; The heart must be nourished by the kidney, and the kidney must be warm. "

Dirty and dirty relationship:

That is, the relationship between the five internal organs. The five zang-organs of heart, lung, spleen, liver and kidney have different physiological functions and unique pathological changes, but the zang-fu organs are not isolated but closely related: the relationship between the zang-fu organs is not only manifested in the morphological structure, but more importantly, there is an inevitable internal connection between physiological activities and pathological changes.

Therefore, the relationship between dirty and not dirty is mutual endowment and mutual restriction. The understanding of the interrelation between the five zang-organs and their internal laws is a scientific summary of the physiological activities of the five zang-organs system. Theoretically, predecessors mostly expounded the pathological influence between the five internal organs on the basis of the theory of five elements generating grams.

However, the relationship between the five zang-organs has long gone beyond the scope of the five elements, and the relationship between them must be explained from the physiological functions of each zang-organs in order to truly reveal the automatic regulation mechanism of the five zang-organs.