Fluid is a term used in the basic theory of Chinese medicine, and is a combination of the terms Jin and Liquid. It mainly refers to the normal fluids and secretions in the human body other than blood, including the internal organs, the body and the internal fluids and secretions of the organs and orifices of the human body. Jin is derived from diet and is produced by the transport of water and grain through the stomach, intestines and spleen, and is distributed throughout the body by the kidneys and lungs, which can moisten and nourish the blood. There are certain differences between fluids and fluids. Fluids, such as sweat, tears, urine, etc., are mainly distributed in the skin, muscles and various orifices on the surface of the body and play the role of nourishment, penetrate into the blood vessels and help excrete waste. It plays a nutritional role. Jin and liquid can be transformed into each other to supplement each other. The production, distribution and excretion of fluid are the result of the coordination of several internal organs. Dysfunction of any one internal organ may affect the production, distribution and excretion of fluid, resulting in a variety of pathologies such as insufficient production or excessive depletion of fluid, or disorders of distribution and excretion, which may lead to symptoms such as dry eyes, dry mouth and loss of appetite. Maintaining a good lifestyle in daily life is conducive to the normal function of the internal organs and fluid, and if fluid abnormalities such as dry mouth and eyes occur, it is necessary to seek medical treatment in a timely manner.