What vital substance is associated with the Lung in Traditional Chinese Medicine?

In Traditional Chinese Medicine (TCM), Qi is regarded as a vital substance that plays a critical role in various physiological processes, particularly concerning the Lung. The Lung is responsible for the production and distribution of Wei Qi, which is the protective energy that defends the body against external pathogens, and is crucial for the smooth flow of Qi throughout the body.

Qi not only supports respiration but also influences the body’s overall energy levels and vitality. It is considered the source of movement and function within the body’s systems, including breathing and circulation. The Lung is associated with the "ascending and descending" movement of Qi, which is vital for inhalation (which brings in Qi) and exhalation (which expels waste gases).

In contrast, while Jing, Blood, and Body Fluids are also essential substances in TCM, they are related to different aspects of health and organ systems. Jing relates to growth and development; Blood pertains to nourishment and is linked more closely with the Heart and Spleen; Body Fluids cover various bodily fluids, playing roles in hydration and nourishment. Therefore, Qi's specific connection to the functions of the Lung reinforces its significance as the vital substance associated with this organ in TCM.