Stomach yang, opposite to stomach yin, refers to the yang qi of the stomach and is responsible for warming, propelling, and evaporating. It is primarily involved in propelling food downward and decomposition, as manifested in governing digestion and descending qi. Food in the stomach is decomposed by stomach yang, whose transformed essence is absorbed and then transmitted to nourish the entire body. The resulting chyme is transported by stomach yang to the small intestine for further digestion and assimilation. Stomach and spleen are two organs in the middle energizer. The former is characterized by yang, preferring moisture and being averse to dryness, whereas the latter is characterized by yin, preferring dryness and being averse to moisture. Stomach yang can restrain moisture that is easy to occur in the spleen, whereas spleen yin can restrain dryness that is easy to show in the stomach. The integration of yin and yang, dryness and moisture is indispensable to the proper functioning of the two organs.