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I have often heard that treating the body is like managing an army. One who manages an army must be proficient in the military strategies of Sun Wu and Wu Qi, so as to reconnoiter the enemy's strength and weakness, understand the tactics of orthodox and unorthodox maneuvers, and thereby implement offensive or defensive measures. One who treats the body must thoroughly comprehend the profound principles of Qibo and Huangdi (the Yellow Emperor), so as to distinguish cold and heat pathogenesis, know the root and branch of diseases, and thereby apply methods of regulation and harmonization. To discuss medicine while discarding the writings of predecessors is like engaging in battle with mere bravery while abandoning the military arts of Sun Wu and Wu Qi; such a person will rarely succeed.

In reviewing the works of predecessors, I find that only the *Treatise on Cold Damage* (*Shanghan Lun*) is discussed in the greatest detail. However, the more detailed the discussion, the more confused its application becomes. Why do meridians transmit changes? How do Yin and Yang circulate and transition? The foolish are ignorant when facing clinical cases, while the clever indulge in creating novelty. They fail to realize that masters such as Zhang Zhongjing and Guo Yunbai devoted their entire lives to writing these books, surely possessing profound insights. It is merely that adhering rigidly to one view without investigating the comprehensive whole causes subtle meanings to remain invisible before one's eyes.

In my youth, I was fond of medical arts and often lamented that among diseases, *Shanghan* (Cold Damage) is like an invasion by troops: life and death hang in the breath, and existence perishes in an instant. Therefore, I extensively sought ancient and modern texts on *Shanghan*, obtaining the six collections of Tao Hua (Jie'an). These include his *Mingli Lun* (Theory of Clarifying Principles), *Jiami* (Family Secrets), *Suoyan* (Trivial Remarks), as well as the *Sheche Chui Fa* (Method of Killing the Cart Hammer), *Yiti Jin Fang* (One Lift Gold Formula), and *Jiejiang Wang* (Net Intercepting the River). These contents penetrate the principles of Heaven and Earth, harmonize Yin and Yang, regulate blood vessels, and differentiate Ying (Nutritive) and Wei (Defensive) qi. Even against empty evils and thieving winds, there are methods of prevention; when applied clinically, they are accurate to the hair's breadth. Indeed, these are the exquisite principles for reviving the dead and the wondrous Dao for benevolence and longevity. Thus, I had them printed to widely disseminate them.

Dated on the first day of the summer month in the Renzi year of the Wanli era, Li Cunji, Student of the Imperial Medical Academy, inscribed this.

A guest visited me and asked, "The profundity of *Shanghan* is indeed great, and the use of Guizhi Tang (Cinnamon Twig Decoction) and Mahuang Tang (Ephedra Decoction) is difficult. Those who recover after taking them are but one or two out of ten; those who do not recover and whose conditions worsen are eight or nine out of ten. Zhang Zhongjing was a great sage in establishing laws; why are his formulas so unreliable? People today fear using them and replace them with mild agents such as Rensu Yin (Ginseng and Perilla Drink) and Jiehe San (Harmonizing Powder), yet no miraculous effects are seen. Would you explain this to me?"

I said, "Alas, it is difficult to explain. Let me prove it with canonical texts. The Canon states: 'In winter, the air is severely cold, and all things hide. If the gentleman keeps himself secure and closed, he will not be injured by cold. Those who violate this are named as having *Shanghan*.' Cold pathogens can cause disease in all four seasons, but *Shanghan* is considered the most toxic because it forms the most severe and lethal energy. If illness occurs immediately upon exposure, it is called *Shanghan*; if it does not occur immediately, the cold toxin hides in the skin and muscles, transforming into Wenbing (Warm Disease) in spring and Shubing (Summer Heat Disease) in summer. Shubing involves heat more intense than that of Wenbing. From this perspective, *Shanghan* refers specifically to the disease name for contracting cold and falling ill immediately during winter. Guizhi Tang and Mahuang Tang were established for *Shanghan* occurring at that time; what relevance do they have to delayed-onset Wenbing and Shubing? Although the principle of contracting disease is the same and they may be collectively termed *Shanghan*, since the time of onset differs, the treatment cannot be mixed. Let me briefly elaborate.

Spring warmth, summer heat, autumn coolness, and winter cold are the righteous energies of the four seasons, facilitating growth, flourishing, harvesting, and storage. Wind also assumes warm, cool, cold, or hot characteristics according to the seasonal qi. If the climate is severely cold, the wind is biting. If the heavenly way is gentle and warm, the wind is mild. In winter, Kan Water dominates, and the heavenly command is closure and storage; water freezes and earth hardens. Wind and cold combine to form lethal energy. When humans encounter this, pores become obstructed, leading to aversion to wind and cold. Such symptoms do not exist in other seasons. Zhang Zhongjing certainly knew that *Shanghan* is formed by the lethal energy of winter, unlike other diseases that allow for slow progression; thus, his discussion in this book is particularly detailed regarding this condition and brief regarding miscellaneous diseases. If one can seek the reality through the name, one will have grasped more than half of the understanding.

Unfortunately, due to the long transmission of this book, many scrolls have been lost. Wang Shuhe, Grand Master of Medicine in the Jin Dynasty, collected the scattered remnants, edited them, and allowed them to circulate; his merit was vast. Alas, he mixed his own theories with the canon, inevitably resorting to forced interpretations. Cheng Wuji followed suit, annotating the text literally without pointing out omissions or correcting errors. This led to the widespread misinterpretation of winter *Shanghan* formulas as applicable to Wenbing and Shubing, causing harm that continues to this day. Wenbing and Shubing must have distinct formulas, which are now lost and unverified. Scholar Song Lian (Jinglian) of our dynasty once lamented that the *Treatise on Cold Damage* is not a complete work; he truly grasped its essence!

Generally, when *Shanghan* invades the human body, it must first enter the exterior. What is the exterior? It is the Foot-Taiyang Bladder Meridian of Hand-Taiyin (Note: Standard TCM terminology is Foot-Taiyang Bladder Meridian). This meridian runs along the back, from the head through the spine, resulting in symptoms of headache, stiff neck/back, and aversion to cold. Other meridians do not present these specific symptoms. Moreover, this meridian is the framework of the body and the master of all Yang qi, like a major intersection of roads. A slight error in treatment leads to consequences too numerous to recount. Therefore, it is appropriate to use these two decoctions to disperse cold pathogens from the exterior, as the Canon states: 'Pungent and sweet dispersing constitutes Yang.' Using these decoctions to universally treat Spring Warmth and Summer Heat would be a grave error.

Guest: "I have heard that *Shanghan* originates in winter. The pathogen is in the exterior, belonging to the Taiyang meridian. Why are there two different medicines (Guizhi Tang and Mahuang Tang) for one meridian?"

Me: "Although the meridian is the same, there is a distinction between Ying (Nutritive) and Wei (Defensive) qi. Cold injures Ying, presenting with aversion to cold, fever, and absence of sweating, with a floating and tight pulse. Floating indicates the exterior; tight indicates cold damage. The presence of cold manifests as a tight pulse; its absence does not. One should use Mahuang Tang, a light and ascending formula, to disperse and eliminate the pathogen. As the cold recedes and sweat appears, the exterior harmonizes, and the patient recovers.

Guest: "I understand the tight pulse. Why is Guizhi Tang used when the pulse is moderate/relaxed?"

Me: "Wind injures Wei. When Wei is injured, spontaneous sweating occurs. Because the Taiyang meridian is affected by wind, it fails to protect the exterior; the pores become loose, and sweat leaks out, resulting in a floating and moderate pulse. Although the pulse is floating and moderate, the underlying contraction of cold is the same; thus, Guizhi Tang, a pungent-warm medicine, is suitable to dissipate the cold. Once pores close and sweating stops, the exterior harmonizes, and recovery ensues. There are cases where both Ying and Wei are injured, making the use of either of the two previous decoctions difficult; therefore, Da Qinglong Tang (Major Green Dragon Decoction) was established. However, this medicine is difficult to use and is not understood by mediocre practitioners.

Guest: "Since there are no methods for Wenbing and Shubing, how should they be treated? How do their pulses and symptoms differ from *Shanghan*?"

Me: "Although Wenbing and Shubing differ, they both originate from cold contracted in winter that was not immediately dispersed. The cold hides within the body for two or three seasons until the heavenly way undergoes drastic change, transforming cold into heat. Humans exist within the interaction of Qi and transform along with Heaven and Earth. Observe that Zhang Zhongjing named immediate-onset *Shanghan* differently from seasonal Wenbing and Shubing; is there no difference? Treatments must utilize pungent-cool and bitter-cold herbs according to the season. How can one generally use winter pungent-warm formulas? The current lack of formulas is due to their loss. Since the Canon states 'transforms into Warm' and 'transforms into Heat,' the winter cold has changed into warm-heat; consequently, formulas must also change with the times.

When Wenbing desires to emerge, coinciding with mild weather, it moves from interior to exterior. The pulse may appear at the Right Guan position, not floating and tight, but slightly rapid. Question: Is there aversion to cold? Answer: *Shanghan* results from winter wind-cold, presenting externally with aversion to cold and wind. Since it is named Wenbing, these symptoms are absent.

Guest: "On what basis is your statement?"

Me: "Based on the Canon. The Canon states: 'Taiyang disease, characterized by fever, absence of aversion to cold, and thirst, is Wenbing.' Absence of aversion to cold indicates the disease is not exogenous; thirst indicates the pathology moves from interior to exterior.

Guest: "Why do diseases in spring and summer sometimes present with headache, aversion to cold, and a floating-tight pulse?"

Me: "This is not the cold contracted in winter, but rather exposure to sudden cold of improper timing. Or, Wenbing/Shubing is about to erupt, and sudden cold is encountered again. Although there are signs of aversion to cold and floating pulse, they are not as severe as in winter. Pungent-cool herbs should be used to unblock the interior and exterior and resolve the condition; Guizhi Tang must absolutely not be used.

Guest: "I understand that the treatment of warm-heat differs from *Shanghan*. May I ask: *Shanghan* in the Three Yang meridians becomes heat pathogen; once transmitted to the Three Yin meridians, it becomes a Yin syndrome. Treating with heat is appropriate. However, in the Three Yin chapter, Sini San (Four Counterflow Powder) is a cooling formula used for Si Ni (cold limbs), and Dachengqi Tang (Major Order the Qi Decoction) is used for Shaoyin disease. What is the reason?"

Me: "Alas, this is likely because Wang Shuhe compiled the incomplete canon as a complete work, conflating transmitted Yin syndromes with direct-entry Yin meridian syndromes, causing harm that persists today. Let me briefly explain. The entry of wind-cold into the body has no fixed pattern; it may enter Yin or Yang meridians without a fixed structure, not necessarily starting at Taiyang and ending at Jueyin. Some start at Taiyang, transmitting one meridian per day, reaching Jueyin on the sixth day; if the pathogen weakens, transmission stops and recovery occurs. Others continue transmitting. Some skip meridians; some stop after two or three meridians; some remain in one meridian throughout; some jump meridians. Some enter Taiyang initially, do not generate stagnant heat, but directly enter Shaoyin to form true Yin syndrome. Others directly strike the Yin meridians forming cold syndromes. Due to the lack of explicit text, later practitioners made erroneous treatments.

Regarding Yin syndromes transmitted from Three Yang to Three Yin: although the exterior presents with cold limbs (Jue Ni), the interior contains heat pathogen. If there is no fever, and limbs are cold with aversion to cold, this is a cold syndrome of direct entry into Yin meridians. Since Wang Shuhe's confusing theory, many have suffered. When Taiyang is invaded, pathogen exhausts the Qi level of Three Yang and transmits to the Blood level of Three Yin; heat enters deeply. Deep heat may present with cold limbs on the exterior but is essentially true heat. The Canon says: 'Excess causes harm, subordination brings control.' Extreme heat may manifest with false cold transformation. If fever precedes cold limbs, it is a transmitted Yin syndrome. The Canon states: 'The deeper the cold limbs, the deeper the heat; the milder the cold limbs, the milder the heat.' Thus, Sini San and Chengqi Tangs should be used based on severity. If cold limbs occur at the onset of illness, with only cold and no heat, it is a direct-entry Yin cold syndrome; Sini Tang category formulas should be urgently used to warm. The Canon states: 'Fever with aversion to cold originates in Yang; no fever with aversion to cold originates in Yin.' What doubt remains?

There are also cases of daily transmission to two meridians, called Liang Gan (Double Contraction), where death occurs before transmission completes. Diseases have root and branch; treatments have counter and conforming approaches. How can they be generalized?

Guest: "I understand the differences in Yin syndromes. I once read Liu Wansu (Shouzhen) stating: 'There are no Yin syndromes in *Shanghan*; injury by cold becomes heat disease, and heat disease is sweating disease. Sweat creation relies on Yang qi. Scanning the *Neijing* and *Lingshu*, there are no cold syndromes; those are miscellaneous diseases erroneously included by Wang Shuhe.' Shouzhen was a brilliant scholar and a private disciple of Zhongjing; why his divergent opinion?

Me: "Although Shouzhen was insightful, his view likely stemmed from the misuse of Guizhi and Mahuang Tangs in the *Treatise* to universally treat cold and heat. Hence his warning: 'During warm-heavenly times, if Guizhi Tang is used, cooling herbs must be added to prevent jaundice and macules.' If one knows these formulas were established for immediate winter *Shanghan* and not for delayed Wenbing/Shubing, this argument would not exist. In his later years, realizing the Dao, he wrote *Bingji Qi Yi Baoming Ji*. There, he used Qianghuo Tang, a pungent-cool formula, to treat improper-time *Shanghan*, with miraculous efficacy, supplementing Zhongjing's losses. How profound!

The *Neijing* states *Shanghan* is heat disease without cold, describing the norm. Zhongjing's discussion includes both cold and heat, describing variations. Combining norm and variation leaves no omission. This is the Dao running parallel without contradiction, mutually reinforcing. This is why it serves as the eternal standard for physicians." The guest nodded and withdrew, requesting that I write these theories down.