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The Lung is located in the upper part and belongs to Yang; the Kidney and Liver are located in the lower part and belong to Yin. The Kidney is the mother of the Liver; the Liver is the child of the Kidney. When the Kidney and Liver suffer from disease together, it embodies the principle of "Yi-Gui Tong Yuan" (Liver-Kidney sharing the same source). Therefore, whenever there is pathology in the Liver Meridian, one must trace the source of transformation to see if it relates to the Kidney. For instance, Shan (Hernia, referring to diseases characterized by pain in the hypochondrium radiating to the testicles) is a disease of the Foot Jueyin Liver Meridian because the meridian circles the external genitalia, reaches the lower abdomen, and connects with the testicles causing pain, all of which are under the jurisdiction of the Liver. However, *Su Wen* also states: When the Kidney pulse indicates disease, if there is a sensation of Qi rushing up from the lower abdomen to the heart causing pain, accompanied by inability to urinate or defecate, it is called Chong Shan (Rushing Hernia). Thus, Shan has not failed to originate from pathology in the Kidney Meridian. Why did Zhu Danxi say that Shan is primarily related to the Liver Meridian and has absolutely nothing to do with the Kidney Meridian? The Kidney is an organ of Water, and the Bladder is its Fu organ. The Bladder is transformed from Cold Water. Shan is originally caused by the invasion of Cold-Dampness Qi. Inviting cold with cold, the pathogen enters most rapidly. Since the Kidney and Bladder are interior-exteriorly related, the classics state: All conditions of contraction and pulling due to cold belong to the Kidney. Therefore, when Shan presents with spasmodic tension and rushes upward to affect the Heart and Stomach, this is precisely pathology caused by Kidney pathogens. Currently, when people suffer from Shan, once they engage in sexual exhaustion, the disease erupts and does not cease. Thus, *Shengji Zonglu* states: Indulgence in desires causes fatigue and injury; when Kidney Water is depleted and unable to nourish Liver Qi, stagnation occurs internally, leading to Yin Shan. This indicates that the onset of Shan is often due to Kidney Deficiency. If treating Shan without addressing the source of transformation, but instead daily employing methods to attack the Liver and promote dredging, the disease will become more severe and difficult to treat. In such cases, one should refer to Danxi's words, recognizing that many cases are caused by exclusive focus on the Liver Meridian or Kidney Deficiency. Using Ren Shen (Ginseng Root) and Bai Zhu (Atractylodes Macrocephala Rhizome) as the sovereign drugs, assisted by dredging agents, is appropriate. One must not cling to the statement that "the Kidney Meridian has no relation" as a basis.

Regarding Liu Hejian's discussion on San Xiao (Three Wasting-Thirst syndromes), he attributes them entirely to excessive Dryness-Heat. Zhang Zihe also judges San Xiao based on Fire. The statements of these two masters are detailed. However, *Nei Jing* also says: When the Heart transfers Cold to the Lung, it forms Fei Xiao (Lung Xiao), characterized by drinking one unit of fluid while urinating two units, which is incurable and fatal. This is because the Primordial Yang is already deficient, resulting in Cold Metal and Cold Water, allowing Yin pathogens to take advantage; Yang deficiency leads to Qi deficiency, and when Yang cannot command Yin, water fails to transform into Qi. Consequently, drinking little yet urinating much constitutes Xiao of the Lung and Kidney. It must be treated with warming agents to disperse Cold pathogens; as Yang Qi gradually returns, Yin-Cold will naturally recede. This is precisely the syndrome described as "Heart transferring Cold to the Lung, drinking one and urinating two." Thus, it can be seen that Xiao involves both Yin and Yang and cannot be entirely classified as Fire.