The kidney in Chinese medicine includes the genitourinary system, as well as the innate material conditions for human development.

The kidneys in Chinese medicine are mainly urinary, reproductive system, bone, brain, marrow, hair and ears in terms of physical form.

From the function, there is the regulation of human growth and development of the prime mover, viscera collection function, water metabolism function, reproduction and reproductive function, sexual function and so on.

The kidneys are like gas tanks. The pots of the gas stove are the spleen and stomach.

The kidney provides energy to the spleen and stomach, and the spleen and stomach cook the food eaten and send it to all the organs of the body, so there is a saying that the kidney is the foundation of the innate and the spleen and stomach are the foundation of the acquired.
In life, we often see some people get sick and reply quickly, some people get sick and reply very slowly, and may even be life-threatening, which involves the nature of the innate and the nature of the latter. Kidney main water, the main collection, the winter of the year, the evening of the day, to say a lot.