"Body fluid" means all normal liquid of the human body, including intracellular and extracellular fluid, secretion such as tears, sweat, urine, gastric juice, etc.

As far as the concept of body fluid, there would be no difference between

TCM (Traditional Chinese Medicine) and modern medicine.

The Formation and Distribution of Body Fluid

The source of body fluid is food and water, which is digested in the stomach and absorbed in small and large intestines. This is, then, transported to the LIS (Lung and Immune System) by the DAS (Digestive and Absorptive System). The transportation and distribution of fluid to all the body is achieved through the cooperative work of the LIS and the DAS. Some fluid goes down to the urinary bladder, where it's stored and excessive water is properly excreted as a form of urine under the regulation of the KHS (Kidney and Hormonal System). The most important thing to be noted here is that the cooperation of the five control systems is necessary for the smooth distribution of body fluid.

The Function of Body Fluid

Body fluid moistens all the organs and tissues, lubricates the joints and nourishes the brain and bones.