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Chapter 77 states: The medical classics say that excellent physicians treat diseases before they occur, while average physicians treat diseases after they have occurred. What does this mean?

The answer is: Treating diseases before they occur means that upon observing a disease of the Liver, one knows that the Liver disease will transmit to the Spleen. Therefore, one first strengthens the Qi of the Spleen (Pi Qi) so that it is not affected by the pathogenic factors of the Liver. This is called treating diseases before they occur. Average physicians treat diseases after they have occurred; upon observing a disease of the Liver, they do not understand the principle of transmission between Zang organs and focus solely on treating the Liver. Hence, this is called treating diseases after they have occurred.

The *Ling Shu: Ni Shun Pian* (Spiritual Pivot: Chapter on Reversal and順顺) states: Excellent physicians apply acupuncture when the pathogen has not yet arisen; next best is applying it when the pathogen is not yet vigorous; next is applying it when the pathogen has already declined. Inferior physicians apply acupuncture when the pathogen is just invading, or when the body's righteous Qi is at its peak, or when the symptoms contradict the pulse. It is said: When the pathogen is vigorous, do not dare to damage the righteous Qi; apply treatment after it has declined, and success is guaranteed. Thus, it is said: Excellent physicians treat diseases before they occur and do not treat diseases after they have occurred; this is what is meant. This refers to treatment: excellent physicians needle when the disease has not yet formed, next when it has just arrived and is not yet strong, and again when it has declined, similar to military strategy avoiding the enemy's sharp advance and striking when they are tired and retreating. Bo Gao said: Do not confront the formidable energy of the enemy, do not attack their well-ordered formations, do not needle when the heat is intense, do not needle when sweating profusely, do not needle when the pulse is chaotic, and do not needle when the disease contradicts the pulse. These are the situations referred to. Inferior physicians do not understand these principles; they needle when the pathogen is just invading the meridians, or when the pathogen is vigorous in the skin and interstices, or when the pathogen and righteous Qi are clashing fiercely. They cannot achieve therapeutic effects, all of which lead to failure. This discussion indicates that acupuncture must be used when the disease has not yet formed or is receding. However, all diseases should be planned for early, not waited until the disease is established to be treated, lest regret ensue. Early treatment requires less effort and yields more success. The merit of "bending the chimney and moving the firewood" (preventing disaster) should be ranked above that of "scorched heads and burnt faces" (treating disaster after it happens). Treating disease should indeed be like this, and managing affairs in the world should also be like this; is it only acupuncture that is like this?

When the Qi of the Five Zang organs is prosperous, it nourishes the organ it generates: Liver generates Heart, Heart generates Spleen, Spleen generates Lung, Lung generates Kidney, and Kidney generates Liver. Transmission in this order is auspicious. In disease, the affected organ insults the organ it normally controls: Liver controls Spleen, Spleen controls Kidney, Kidney controls Heart, Heart controls Lung, and Lung controls Liver. Reverse transmission is ominous. Excellent physicians treat diseases before they occur by treating the Zang organ that is about to be transmitted to but has not yet become diseased. Thus, seeing a Liver disease, knowing it will transmit to the Spleen, one should first strengthen the Spleen, preventing transmission and allowing the Liver disease to heal. Hence, it is called treating diseases before they occur. Average physicians fail to grasp this; seeing a Liver disease, they merely treat the Liver. Consequently, the Liver disease is not resolved, and a Spleen disease arises anew. Hence, it is called treating diseases after they have occurred. The *Su Wen: Yu Ji Zhen Zang Lun* (Basic Questions: Chapter on the True Depositions of the Five Zang) states: The Five Zang receive Qi from the organ that generates them, transmit it to the organ they control, retain Qi in the organ that generates them, and die when afflicted by the organ that overcomes them. Before death, the disease must transmit to the organ that overcomes it, and then death occurs. This speaks of the reverse flow of Qi, hence death. This is also the same principle.

Commentary: This chapter contains the profound and subtle tenets of ancient medical classics. Yue Ren (Bian Que) expounded on its meaning, though not exhaustively. Zhang Zhongjing expanded upon it in the *Jin Gui Yao Lue* (Essential Prescriptions of the Golden Cabinet), providing a valuable guide for later students. Question: What is treating diseases before they occur? Answer: Treating diseases before they occur means seeing a Liver disease, knowing it will transmit to the Spleen, and thus first strengthening the Spleen. If the Spleen is prosperous in the four seasons and immune to pathogens, supplementation is unnecessary. Average physicians do not understand transmission; seeing a Liver disease, they fail to strengthen the Spleen and only treat the Liver. For Liver disease, sour flavors supplement the Liver, bitter flavors assist the Heart, and sweet flavors regulate the Spleen. Sour enters the Liver, bitter enters the Heart, and sweet enters the Spleen. The Spleen controls the Kidney; if Kidney Qi is weak, Water fails to circulate. If Water fails to circulate, Heart Fire becomes vigorous. If Heart Fire is vigorous, it controls Lung Metal. If Lung Metal is controlled, Metal Qi fails to circulate. If Metal Qi fails to circulate, Liver Wood becomes vigorous, and the Liver disease heals itself. This is the subtlety of treating the Liver by supplementing the Spleen. This method applies to Liver deficiency, not Liver excess. The classics state: Do not make deficiency more deficient or excess more excessive; supplement insufficiency and reduce excess. This is the principle. The same applies to other Zang organs.

This passage should be read in three parts. The first part states that Liver disease inevitably transmits to the Spleen due to Wood controlling Earth. Excellent physicians first strengthen the Spleen; if the Spleen is strong and immune to Wood control, the Liver disease cannot transmit and heals. However, Zang Qi prosperity correlates with seasonal timing. In the months of Chen, Xu, Chou, and Wei (the last month of each season), Earth is prosperous for eighteen days per season, totaling seventy-two days for each element. If Spleen Earth is at its peak, it resists pathogens, so no supplementation is needed, and Liver Wood cannot insult it. Over-supplementing the Spleen would violate the prohibition against "making excess more excessive." Average physicians ignore the principles of Five Element decline/prosperity and transmission/control; seeing Liver disease, they treat only the diseased Liver, neglecting to strengthen the healthy Spleen.

The second part states that Liver diseases are often deficient, as deficiency invites pathogens. If Liver Wood is weak, Lung Metal may insult it (reverse control). Excellent physicians intervene before Metal insults Wood. They use sour flavors to tonify the Liver's substance, bitter flavors to assist its offspring, the Heart Fire, preventing the leakage of Liver Wood Qi and thereby controlling Lung Metal. They use sweet flavors to benefit Spleen Earth and control Kidney Water. Weak Water leads to vigorous Fire; vigorous Fire controls Metal; controlled Metal allows Wood to remain uncontrolled, healing the Liver disease. This reflects the principle that "excess causes harm, and restraint brings balance," utilizing indirect treatment methods (intervening through two or three organs). Hence, it is called the subtlety of treating the Liver by supplementing the Spleen.

The third part states this method applies to Liver deficiency, not Liver excess. Average physicians misunderstand deficiency and excess; using purgation on deficiency makes it "more deficient," and using tonification on excess makes it "more excessive." Thus, the classic text cites "supplement insufficiency, drain excess" to validate this principle. "The rest follow this pattern" implies drawing inferences from the Liver example. This aligns roughly with the principle in Chapter 75 of "draining the South and supplementing the North." You Shi's commentary on the *Jin Gui* failed to understand the logic of indirect treatment, erroneously claiming that the fifteen sentences starting from "Sour enters the Liver" were added by later authors.