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Yu Jiayan changed "autumn injury by dampness" (Qiushangyu Shi) to "injury by dryness" (Shangzao). For Yu, this was merely borrowing the meaning of autumn dryness syndromes, but arbitrarily altering the classic text is erroneous. Dampness (Shi) is not a textual error for dryness (Zao). The *Suwen* (Plain Questions), chapter "Shui Re Xue Lun" (Discussion on Water and Heat Acupoints), states: "In autumn, Metal Qi begins to govern; the Lung prepares to gather and kill; Yin Qi initially prevails, and dampness invades the body." This is the sequential transition of the Four Seasons and Five Phases. It is only because the transition between Earth's dampness and Metal's clarity is too rapid, that the command of dampness has not faded while the command of coolness and gathering has already arrived. Thus, initially, although dampness is abundant, its Qi scatters outward; by late autumn, dampness gathers and enters the interior of the body; by winter, Yang Qi enters again. The interaction of Yang and dampness causes coughing. If it were an injury by dryness, coughing would occur in autumn, without waiting for winter. His prepared formula, Qingzao Jiufei Tang (Clear Dryness Rescue Lung Decoction), also treats autumn dryness, not the dryness associated with winter coughs.

Dryness is secondary cold; its Qi belongs to Metal; its manifestations are dryness, hardness, descent, clarity and analysis, and sharpness—all are the proper commands of Metal. If it is hot dryness, it carries fire within, standing in opposition to cold dryness, and does not exclusively belong to Metal. If Yu speaks of dryness solely in terms of heat, how then should one explain "water surfaces freeze, bellies become hard"?

Shaoyang disease (Taiyang Bing) is not a rare disease. The *Shanghan Lun* (Treatise on Cold Damage) is not a rare book. Zhang Zhongjing recorded what he observed in writing; it is not that people worldwide fell ill based on the existence of this book. In the sections describing the transitions of the Three Yin and Three Yang, predecessors often used rigid and dogmatic language, as if dark spirits were directing the pathogenic factors, dictating transmission methods, leaving readers unable to understand how transmission actually occurs. Readers must eliminate such speculative views. When reading each section, one should imagine a patient present there, deduce their pathogenesis and treatment methods, and then reference the text. One should not merely arrange interpretations based on the text itself.

First, one must distinguish what kind of disease Shaoyang disease is. This is a disease present in all four seasons, but in the other three seasons, it often involves complications with warmth, dampness, dryness, or wind. Its Qi is not exclusively cold; the skin and pores are loose; initial injury involves two or three meridians simultaneously, and upon further transmission, all six meridians are affected. Only in winter are the pores solid and dense; cold pathogens must first injure the skin and gradually penetrate deeper. Therefore, it is correct to say that treatment methods for cold damage differ across the three non-winter seasons, but incorrect to say there is no cold damage in those seasons. Zhang Zhongjing specifically discussed winter cold damage. However, cases occurring immediately in winter and those delayed until spring are often intermixed and not clearly analyzed. The delayed cases in spring specifically refer to cold diseases that have not yet transformed into heat, which differs from the principle in the *Neijing*: "Winter injury by cold leads to warm disease in spring." Refer to the previous explanation of the Fa Yin and Fa Yang chapters. The term "latent qi" (Fuqi) need not be sought too deeply. Contracting cold today and falling ill today is indeed immediate illness; contracting cold last month and falling ill next month is also common. It can be called latent qi, or it can be called immediate illness. Why must mentioning latent qi make it seem strange?

Second, one must distinguish what "cold" and "heat" represent in the treatise. Cold is the pathogenic Qi of heaven and earth; heat is the righteous Qi of the human body, constrained by cold pathogens, unable to diffuse, and becoming stagnant due to constraint. They are two distinct Qis; cold does not transform into heat. This differs from warm-heat diseases caused by heavenly and earthly heat pathogens. Once cold pathogens dissipate, Yang Qi should extend and heat resolve. If it does not resolve, it is because righteous Qi has been trapped for a long time, meridians are stagnant, and cannot move freely, or it is due to mis-treatment.

Third, one must view the character "transmission" (Chuan) flexibly. Pathogens do not have feet to walk neatly from the interior to change positions. Whatever manifestation the syndrome presents indicates which meridian the pathogen has injured. For example, Shaoyang governs the movement of fluids; if fluids are scorched and dried, it is a Shaoyang syndrome; Yangming governs the transport of residues; if residues become dry and bound, it is a Yangming syndrome. Readers must ponder why there is headache, vomiting, dizziness, and hypochondriac distension? Why constipation, tidal fever, and spontaneous sweating? Do not simply say "because pathogen entered Shaoyang" or "because pathogen entered Yangming!" One must seek explanations in Qi transformation, not be confined to anatomical locations.

Fourth, one must distinguish initial injuries involving the Three Yang, simultaneous infection of Yin and Yang (Lianggan), and direct invasion (Zhizhong). Taiyang runs along the back and governs the exterior; at this time, Yangming and Shaoyang are inevitably involved. The *Neijing* states: "Injury at the nape transmits to Taiyang; injury at the face transmits to Yangming; injury at the cheek transmits to Shaoyang; injury at Yang flows into meridians; injury at Yin flows into fu organs." Even the Taiyang wind-strike described by Zhang Zhongjing, with nasal congestion and dry retching, is not exclusive to Taiyang. Since the pathogen is at the great exterior, treatment does not go beyond Mahuang Tang, Guizhi Tang, or Gegen Tang, so there is no need to establish many new categories. Lianggan and Zhizhong both result from deficiency of the person's Yang Qi or ferocity of the pathogen. Taiyang-Shaoyin and Yangming-Taiyin both have Lianggan; Shaoyang-Jueyin Lianggan is rare. Zhizhong is similar. Shaoyang-Jueyin Lianggan implies Yang Qi is negligible. The difference between Zhizhong and Lianggan is that Lianggan involves simultaneous disease of one Yin and one Yang with equal pathogen strength; Zhizhong involves pathogen overwhelming the Yin, though Yang is undoubtedly also injured. However, Yin branch diseases are comparatively more urgent than simple infections.

Fifth, one must recognize that injuring Ying and Wei cannot be strictly separated into two paths. Zhang Zhongjing stated wind injures Wei and cold injures Ying, briefly mentioned in Mahuang patterns, without overly analyzing the bias of wind versus cold injury. His intent focused on cold; it is a connected argument, not a flat statement. Moreover, wind-strike features slow pulse and spontaneous sweating; sweat is Ying fluid, and Ying fluid leaking externally means Guizhi Tang is a formula to replenish Ying Qi. Cold-damage features tight pulse and absence of sweating; this is Wei Qi constrained by cold. Mahuang is light and swift, penetrating Ying to open Wei and release the exterior, with force directed at Wei. How can one say wind injures Wei but not Ying, and cold injures Ying but not Wei? How can this be split into two major outlines?

According to winter months when pores are closed and dense, cold pathogens penetrate gradually. Initial injury to skin stays in the Qi level; dispersing it then does not require sweating, and the pathogen dissipates naturally. Secondary injury to muscles affects Jin-Ye (body fluids); pathogen exits with sweat, and sweat releases the pathogen. Tertiary injury to meridians enters the Blood level; once in meridians, it may窜 (creep) into sinews and bones, or disperse through Sanjiao to occupy Zang-Fu organs. There are also cases reaching sinews and bones without entering meridians, hence Three Yin also have exterior patterns suitable for sweating. Once in meridians, it necessarily connects to Zang-Fu organs, and one cannot rely solely on sweating methods. Before entering meridians, the so-called Taiyang, Yangming, Shaoyang, and Three Yin diseases refer only to the regions of the Three Yin and Three Yang, not the meridians themselves. Refer to Volume 2, "Meaning of Three Yin and Three Yang."

Sixth, one must distinguish the mechanism of cold-heat transmission and transformation. Initial injury is always cold. Over time, some cold pathogens sink inward, indicating the person originally had internal cold. Some cold leaves but heat remains unresolved, indicating Yin insufficiency. Cold sinking inward必然 (necessarily) causes diarrhea, known as Yin transmitting to Taiyin, which is essentially Yangming sinking. Subsequently, Shaoyang Qi sinks, then Shaoyin Qi sinks, until Jueyin Liver Qi sinks, leaving no vitality. It always revolves around diarrhea. If diarrhea stops early, before Jueyin sinking, death is avoided; if it stops after Jueyin sinking, with high breathing and vertigo, Yin Qi is exhausted. Unresolved heat必然 leads to constipation and spontaneous sweating, known as Yang transmitting to Yangming. At this point, Taiyin fluids are depleted; improper treatment depletes Shaoyin essence and Jueyin blood. It always revolves around constipation. Unless the pathogen reaches Yangming, there is no further transmission; it always centers on Yangming!

Seventh, one must recognize that the theory "Shaoyang and Warm diseases start differently but end similarly" is inflexible. This only covers the side of heat transmitting to Yangming; cold transmitting to Taiyin is completely different. Shaoyang disease has cold-death patterns, but no heat-death patterns. Internal excess in Yangming is not a death pattern; deaths there are due to mis-treatment. Warm-heat diseases, however, have natural, unchanging heat-death patterns.

Eighth, one must recognize that among Hebing (combined disease) and Bingbing (concurrent disease), there are true and false differences. Predecessors' distinctions between Hebing and Bingbing were often forced. Two Yang meridians infected simultaneously is Hebing; spreading from one to another is Bingbing. Furthermore, if pathogens have not reached another meridian but disturb it, the manifestations will differ in deficiency and excess. For instance, someone with chronic stomach cold who contracts cold will have bland taste and loose stools; someone with chronic Yin deficiency who contracts cold will have internal heat stagnation, leading to wheezing and thirst. Is this truly pathogen transmitting to Yangming and Taiyin? Simply dispersing the cold cures the symptoms; sometimes slight attention to underlying deficiency is needed to preemptively block the path from internal sinking.

Ninth, one must seek the true reality of cold-heat Qi transformation. The sequence of Six Meridian transmission need not follow Zhang Zhongjing's chapter order. Unfortunately, predecessors spoke too rigidly about "transmission across meridians" and "interior-exterior transmission," failing to anchor in each meridian to explain the rationale. For example, Shaoyang governs meridian fluids; scorching leads to Shaoyang signs; Taiyin governs intestinal fluids; scorching leads to Taiyin signs; Yangming governs intestinal residues; drying leads to Yangming signs; Jueyin governs fascia fluids; withering leads to Jueyin signs; Shaoyin governs lower Jiao Qi transformation and fluids; exhaustion leads to Shaoyin signs. This is transformation from heat. Transformation from cold involves insufficient Yang Qi causing downward leakage and overflowing cold water causing upward rebellion. Regardless, whichever Zang is injured, that meridian shows signs.

Tenth, cold and heat transformation depend on the individual's constitutional Yin-Yang and deficiency-excess. This statement is shallow yet profoundly true. After mis-sweating in the treatise, some develop internal cold, others internal heat; after mis-purging, similarly, some have internal cold, others internal heat. Rigidly applying examples of excessive sweating destroying Yang or excessive purging destroying Yin makes the text incomprehensible. Thus, readers should prioritize deriving meaning from the context. The Six Meridians transmit via deficiency, and cold/heat transform according to bias.

Eleventh, one must understand the concept of Exterior and Interior. There is structural exterior-interior, meridian exterior-interior, Zang-Fu exterior-interior, and Qi-transformation exterior-interior. Structural refers to skin, muscle, sinew, bone, i.e., parts. Pathogen in the Three Yin regions is interior yet still exterior, suitable for sweating; pathogen in Three Yang meridians is exterior yet already interior, requiring clearing and transforming, i.e., harmonizing. Shaoyang is half-exterior half-interior, which has several interpretations: structurally, external meridians connect internally to Sanjiao; in Qi transformation, exterior-interior is unclear, but interior heat is abundant, always showing signs of Qi transformation dryness-binding. Refer to Volume 4, "Three Prohibitions of Shaoyang."

Twelfth, one must know there is no distinction between Hand and Foot meridians. Foot meridians cover large areas; when pathogen is at the exterior, outside the meridians, its Qi is broad, hence Foot meridian signs appear; when pathogen enters the meridians, Hand meridian signs often appear instead. Generally, Foot meridian signs appear mostly outside the body shell; Hand meridian signs relate mostly to the interior of Zang-Fu organs. Foot signs can be in meridians; Hand signs rarely are. Meridians concern the physical form; Zang-Fu concerns spirit and Qi transformation.

Thirteenth, one must know Three Yin and Three Yang are merely elegant names for meridian exterior-interior relationships, unrelated to Zang-Fu and Qi-Blood Yin-Yang. To say pathogen entering Three Yang injures Yang, and entering Three Yin injures Yin, is wrong. The *Neijing* states Heart is Taiyang, Liver is Shaoyang, Lung is Shaoyin, Kidney is Taiyin, Spleen and Six Fu organs are Supreme Yin. This discusses clear and turbid Qi-Blood, a concept moderns ignore. Actually, each meridian, Zang, and Fu contains Yin and Yang. This topic is lengthy; careful study of the *Neijing* allows one to discern it.

Fourteenth, reading requires acknowledging doubts. The treatise describes syndromes simply or complexly; some formulas do not match syndromes; some contexts lack coherence. Placing oneself in the situation makes strict adherence difficult. Could these be misplaced or missing bamboo slips? Do not waste effort; wait for future experience. For example, Shaoyang-Yangming Hebing with spontaneous diarrhea uses Huangqin Tang; Taiyang mis-purged with unremitting diarrhea is協熱利 (Xiere Li), treated with Chengqi Tang. This implies latent internal heat, turbid Qi stagnation in Sanjiao and intestines, resembling warm diseases from latent pathogens, which does not fit standard Shaoyang spontaneous diarrhea or mis-purged diarrhea. Also, Taiyang mis-purged chest binding should involve opening and descending to vent sunk Yang and resolve pathogen binding, yet Gan Sui and Ba Dou are used for heavy purgation, compounding the error. Sun-Yangming Hebing with diarrhea uses Gegen Tang; without diarrhea but with vomiting, Gegen Tang plus Banxia. If no diarrhea, why use the original formula? The original formula treats Hebing, not specifically diarrhea; why specify diarrhea earlier? Such points require deep thought. Predecessors only said Three Yang Hebing all have diarrhea, never explaining why. This is half-baked scholarship.

In summary, reading the *Shanghan Lun* should focus on absorbing the plain text. There are dozens of commentators; over twenty I have seen are all forced and associative, sounding novel but ineffective in practice. My view divides it into four layers: Treatment of primary patterns of early Shaoyang disease; Treatment of accompanying patterns of early Shaoyang disease; Treatment of cold transformation and mis-treatment-induced cold patterns of prolonged Shaoyang disease; Treatment of heat transformation and mis-treatment-induced heat patterns of prolonged Shaoyang disease. Cholera, wind-dampness, food relapse, and labor relapse are attached as miscellaneous diseases. Cross-reference with Tao Jian'an's works and various warm-heat treatises for mutual verification. This ensures organized reading and clinical pathways. While meridian locations and structural exterior-interior depth must be studied, one must not cling to them excessively; effort should lie in Qi transformation. Before the Tang Dynasty, this book was not a single volume; chapter divisions had no profound meaning. Readers should contemplate the text itself, not force connections with context; over time, integration will occur naturally.