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The book *Shanghan Lun* (Treatise on Cold Damage), according to the preface by Duke of Changsha (Zhang Zhongjing), was originally titled *Shanghan Zubiing Lun* (Treatise on Cold Damage and Sudden Diseases) and consisted of sixteen volumes. After being compiled and arranged by Wang Shuhe of the Western Jin Dynasty, the six volumes concerning sudden diseases had long perished, and later generations could no longer see them. It is said that Wang Shuhe reorganized it into thirty-six volumes. Later, Cheng Wuji of the Jin Dynasty, relying on the remaining books of Wang, annotated it as *Shanghan Lun* in ten volumes. This not only prevented the original work of Zhang Zhongjing from being seen again, but also made Wang Shuhe's work completely invisible. Merely reading Wang Shuhe's "Preface to Examples of Cold Damage" reveals his misuse of canonical texts and establishment of erroneous theories, which are hardly worth viewing; it would be better if they had perished.

Cheng Wuji's annotated version was originally ten volumes, but what circulates today amounts to only seven volumes. The first volume, comprising "Differentiating Pulse Methods" and "Leveling Pulse Methods," contains words originally from Zhang Zhongjing, which is acceptable. However, the second volume, "Examples of Cold Damage," was written by Wang Shuhe, not Zhang Zhongjing. Why is it included among the seven volumes and placed before the discussion of the Six Channels? This is not only logically contradictory but also like placing a hat on feet and shoes on hands, creating chaos and confusion. Although the seventh volume contains authentic texts of Zhang Zhongjing regarding Cholera, Yin-Yang Transformation, and various post-illness recurrence syndromes, the subsequent sections on "What Can and Cannot Be Done" are not the work of the Duke of Changsha. How do we know this? The beginning of the volume states: "Because diseases arise urgently and are hard to find remedies for in haste, I have re-collected various 'can be done' and 'cannot be done' treatments, making them easier to see than the Three Yin and Three Yang." Such tone is undoubtedly collected by Wang Shuhe. Moreover, statements like "spring is suitable for sweating," "spring is suitable for vomiting," and "autumn is suitable for purging" are theoretically unsound and should be deleted. Therefore, I have removed them. I focus solely on the treatment of the Six Channels (Three Yang and Three Yin), clarifying the reasons for establishing laws based on their normal and abnormal variations, and elucidating the principles behind prescription formulation. There are twenty-two chapters in total, still divided into ten volumes, strictly following Zhang Zhongjing's original structure.

For the Taiyang Channel, dividing it into Upper, Middle, and Lower sections originated with Xu Shuwei of the Song Dynasty. Fang Zhongxing of Xin'an in the Ming Dynasty, in his *Shanghan Tiaobian*, adopted this method, dividing Taiyang into three sections: Wind injuring Wei (Defensive Qi) as the Upper Section, Cold injuring Ying (Nutritive Blood) as the Middle Section, and Wind-Cold injuring both Ying and Wei as the Lower Section. Yu Jiayan of Jiangxi, in his *Shanglun Pian*, did not change this method and kept the three sections. Although we do not know the original order intended by Zhang Zhongjing, reasoning suggests this arrangement is appropriate. I dare not change this method and will maintain the three sections.

The Yangming Channel was not previously divided into sections, but Zhang Zhongjing's text already poses a question: "There is Taiyang Yangming, Zhengyang Yangming, and Shaoyang Yangming." This implies Zhang's intent to divide sections. Dividing based on this largely preserves the author's intent and may be acceptable. Although *Shanglun* divides it into three sections, claiming that without this view the order is unclear, I now divide it into three sections based on Zhang's original text. Within the Taiyang-Yangming section, I further divide it into two paragraphs: those who can eat are affected by Wind, and those who cannot eat are affected by Cold, so that readers may understand clearly without doubt.

Regarding the Shaoyang Channel, Cheng Wuji's and Fang's annotations are brief and sparse, containing less than a few sections. Even Yu's edition adds little, only about twenty clauses. Other Chaihu Tang (Bupleurum Decoction) patterns that should belong to the Shaoyang section were mistakenly entered into the Taiyang section, causing confusion of meridians and disorder of chapters, making them unreadable. Now, taking the first clause of Shaoyang—"alternating chills and fever, fullness and discomfort in the chest and hypochondrium, governed by Xiao Chaihu Tang"—as the main disease, I take Xiao Chaihu Tang as the main formula. I then deduce its different variable syndromes, such as Chaihu Guizhi Tang, Chaihu Guizhi Ganjiang Tang, Chaihu Mangxiao Tang, and Chaihu Jia Longgu Muli Tang, all of which are variations of Xiao Chaihu Tang, and list them afterwards to form one chapter. This allows scattered content to return to its proper chapter, facilitating search. I append He Bing (Combined Disease) and Bing Bing (Concurrent Disease) afterwards to exhaust the transformations of the Three Yang channels, concluding the treatment of the Three Yang.

Taiyin has few entries, but Cholera is caused by Cold Evil of Taiyin, so I attach it to the end as a separate chapter. Shaoyin belongs to Kan (Water); although it is a Yin organ, True Yang is hidden within cold water, representing the place where extreme Yin generates Yang. It is most unfavorable to lack Yang. Thus, special emphasis is placed on Yang Qi. However, when Yang Evil is rampant, it consumes True Yin and causes loss of body fluids, which is also significant. Predecessors often mixed these up indiscriminately. *Shanglun* already divided it into two chapters, which is very correct. I now analyze it more meticulously into front and back chapters, so that Jing and Wei flow separately, making Yin and Yang easy to distinguish.

Jueyin is the channel where Yin Qi is at its extreme, yet similar to Heaven and Earth where Yang Qi has grown and is about to emerge from the ground, it is a channel of half Yin and half Yang. Therefore, Jue and Re (heat) appear alternately, making it difficult to divide into sections. Even various diarrhea syndromes have distinctions of Yin/Yang and Cold/Heat, shared by the Three Yin channels. Although seen in the Shaoyin chapter, they are gathered at the end of this chapter because Jueyin contains Yang within Yin and often presents with abscesses, pus, and bloody stools, thus gathering them into one chapter. Yin-Yang Transformation and post-illness recurrences are sequelae after illness, appearing after the Jueyin chapter because it marks the end of the Six Channels.

"Bian Mai Fa" (Differentiating Pulse Methods) without annotation, and the five chapters of *Suwen* (Basic Questions) already annotated, are the roots of *Shanghan Lun*. They await subsequent printing. The two instances of "Huai Bing" (Ruined Disease) in the treatise were historically left hanging within the treatment of the Three Yang, never finding a proper place. Predecessors failed to understand Zhang Zhongjing's reason for establishing this law, sighing over it as lost bamboo slips lacking treatment methods. This led Yu Shi to create a separate category, occasionally placing it among other chapters, without knowing the actual meaning of "treating according to the syndrome." Who knows that "holding an axe to cut an axe handle, the pattern is not far"? Once the principle is understood, one sees that the lamp is the fire itself; why seek far away? Where is the need to sigh? Now, I place the clause "Taiyang Syndrome, Guizhi Tang is not suitable" after the standard treatment of Guizhi Tang in the Upper Section of Taiyang. The subsequent clauses describing errors in sweating, purging, vomiting, and misuse of moxibustion/warming needle constitute Huai Bing. The formulas attached below are the treatment methods for Huai Bing, which is the reality of "treating according to the syndrome." It is called "Ruined" because it was ruined by medical error, i.e., variable syndromes from mis-treatment. A Taiyang syndrome that was not initially ruined becomes ruined due to incorrect sweating, vomiting, purging, or warming needles. Similarly, a case where initial Taiyang fails to resolve and transfers to Shaoyang is placed after the standard treatment of Xiao Chaihu Tang in the Shaoyang chapter. The subsequent variable syndromes from mis-treatment are Shaoyang Huai Bing, representing the reality of treating them with law. The regulations are orderly, and treatments are rigorous. What is there to doubt or sigh about? The obscurity and confusion stem from poor compilation, leading to disarray, which modern readers cannot discern.

Jie Xiong (Chest Binding) and Pi Zheng (Fullness Syndrome) vary in Yin/Yang and Deficiency/Excess. Traditional annotations claim Jie Xiong is caused by Wind injuring Wei and Yang Evil sinking in, while Pi Zheng is caused by Cold injuring Ying and Yin Evil sinking in. This is a millennium-old error. Careful reading shows that Wind Strike can cause epigastric fullness, and Cold Strike can cause Chest Binding. Sometimes Wind and Cold appear together, resulting only in epigastric fullness; sometimes only Cold Strike results in epigastric fullness, hardness, and pain (Chest Binding), while fullness without pain is Pi Zheng. These are complex and interwoven, with no fixed rules. How can one rigidly assign Pi and Jie to Wind/Cold or Ying/Wei? Therefore, they cannot be classified into the Upper or Middle sections. I first present a general outline chapter, then list specific entries afterwards, forming a separate volume situated between the three sections, after the Wind and Cold chapters, to show that both Wind and Cold can produce these two syndromes, and for ease of reference.

Wen Bing (Warm Disease) and Feng Wen (Wind Warmth) originally belong to warm pathogens of spring and summer. I speculate that Zhang Zhongjing's intent was to use Qinglong Tang (Green Dragon Decoction) as the main agent for treating Warmth, and Baihu Tang (White Tiger Decoction) for Summer Heat. Since their pathogen source belongs to Taiyang, and Da Qinglong Tang is already the main treatment for the first clause of the Taiyang Lower Section, it should also be attached after the Taiyang Lower Section. The three Dampness syndromes, although Wang Shuhe said they should be discussed separately, enter through Ying and Wei, so their syndromes belong to Taiyang and are thus called Taiyang Disease. Therefore, they are attached to the end of Taiyang.

The 112 prescriptions in the treatise: Lin Yi, a Song dynasty scholar-official, corrected the medical books by imperial decree. In his preface to *Shanghan Lun*, he cited Huangfu Mi's preface to *Jiayi Jing*: "Yi Yin, with his sage-like talent, used *Shennong Bencao Jing* to formulate decoctions. Zhang Zhongjing of Han expanded these into ten-plus volumes, proving effective in use." Thus, their methods descend from Shennong and honor Yi Yin. Cheng Wuji's annotations discuss each prescription, generally applying *Neijing* principles like "sweet to relax, pungent to disperse, sour to astringe," and "treat internal heat with salty-cold, counteract excess cold with pungent-hot." This fails to fully expound Zhang Zhongjing's legislative intent, inviting criticism of mere textual interpretation. Now, I establish a discussion for each prescription, tracing the intent of formulation, explaining the reasons for drug selection, meridian entry, organ targeting, drug properties (cold/hot/warm/cool), and usage (ascending/descending, tonifying/draining). I clarify reverse/conventional, odd/even, slow/urgent applications, and techniques like "treating heat with cold," "treating cold with heat," "using unblocking for unblocking," "using blocking for blocking," and orthodox/reverse support, akin to military tactics of orthodox and flank maneuvers, and real/empty adjustments. This helps students appreciate the brilliance of Zhang Zhongjing's law-making and prescribing, ensuring their meticulous thought process prevents reckless medication errors.

My annotations contain many debates to correct previous errors. Though later scholars dare not criticize predecessors, the Dao is public, and people's lives depend on it. If I cling to minor details and allow errors to persist, how can I justify myself to the people? Mencius said, "If not straight, the Dao is not revealed." Thus, profound matters must be spoken of if known. I avoid overly verbose arguments but do not hesitate to correct inaccuracies using Zhang Zhongjing's own words, Huangdi/Qibo's classics, or prior experts' insights. I cite valuable points with admiration. All discussions are impartial. I critique worthy predecessors to supplement their omissions and address numerous errors in unworthy ones, though I limit the latter to avoid exhaustion. I submit this to friends, indifferent to praise or blame.

Although my debates are extensive, detailed explanation is necessary for enlightenment, hence the verbosity. I do not plagiarize predecessors but cite sources precisely (specific chapters, authors, books) for verification, unlike Cheng Wuji and others who casually quote "The Classic says" even for Wang Shuhe's prefaces or absurd claims, confusing students and distorting classics. For example, Wang Shuhe altered *Suwen* quotes in his preface, changing "Injury by cold leads to heat disease" to "All injuries by cold lead to heat disease," and added pulse diagnoses for Taiyang/Yangming, mixing personal views with scripture. Zhu Fengyi altered formulas, and Tao Jie'an erased Zhang's original text, betraying classics and misleading later generations. Some even stole predecessors' notes and criticized them. My citations are not for show but to avoid repeating past mistakes.

All books have tables of contents, but previous annotations lacked order. Chapters were chaotic, making it hard to find any formula or method without exhaustive searching, frustrating readers. I have now added a table of contents outside the volumes, following standard practices, to facilitate search.

Dated the 16th day of the 10th month of the Dinghai Year of Kangxi, Qian Huang of Yushan records.