In TCM, which body system is particularly affected in Yang deficiency?

In Traditional Chinese Medicine (TCM), Yang deficiency is primarily associated with the digestive system, known as the Spleen in TCM terminology. Yang represents the active, warming, and transformable aspects of the body's energy. When there is a deficiency of Yang, it leads to a weakened ability of the body to transform and transport nutrients, resulting in digestive disturbances.

A common presentation of Yang deficiency involves symptoms such as coldness in the body, fatigue, decreased appetite, and loose stools, all of which can be traced back to a compromised digestive process. The Spleen's Yang energy is crucial for effective digestion and the generation of Qi (vital energy). When the Spleen Yang is deficient, it fails to properly transform food into Qi and Blood, leading to digestive issues and further impacting overall health.

In TCM, while Yang deficiency can influence other systems such as the circulatory system and immune system indirectly, it is most directly related to the functioning of the digestive system, making it the focus in cases of Yang deficiency.