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Zhang Zhongjing named his work "Shanghan Lun" (Treatise on Cold Damage), which he himself titled; Zhang Zhongjing wrote this book to discuss Shanghan (Cold Damage diseases), as stated in his own preface. However, commentators insist that this book also discusses Wenyue (Warm Heat diseases). Why is it that besides the three categories of Fengzhong (Wind Strike), Shanghan (Cold Damage), and Fengwen (Wind Warmth) in his book, he repeatedly describes what Fengzhong is and what Shanghan is, but does not further describe what Wenbing (Warm Disease) or Rebing (Heat Disease) are? This clearly shows that he exhaustively discussed the variations of Shanghan (Cold Damage diseases), specifically using Fengwen (Wind Warmth) as an example, as I mentioned in my previous chapter. Commentators further argue that the presence of formulas for treating heat conditions in the book poses a difficulty. At first glance, cold-natured medicines indeed seem contrary to cold diseases. However, consider that if cold pathogens directly invade the interior, they can be warmed with acrid-hot herbs like Xixin (Asarum Root) and Fuzi (Prepared Aconite Root); if cold pathogens have just invaded the exterior, they can be dispersed with Mahuang (Ephedra Stem) and Guizhi (Cinnamon Twig). If cold pathogens have entered the interior and transformed into heat, then at this stage, one must reject the warming effects of Xixin (Asarum Root) and Fuzi (Prepared Aconite Root) and avoid the dispersing actions of Mahuang (Ephedra Stem) and Guizhi (Cinnamon Twig). In such cases, apart from Shigao (Gypsum Fibrosum), Zhimu (Anemarrhenae Rhizoma), Huangqin (Scutellariae Radix), and Lianhua (Lotus Plumule), what else could be used? The situation necessitates treating them similarly to Wenyue (Warm Heat diseases), yet the disease being treated still originates from Shanghan (Cold Damage diseases), not from Wenyue (Warm Heat diseases). Shanghan (Cold Damage diseases) and Wenyue (Warm Heat diseases) start differently but end similarly. For instance, Wind and Cold are originally different, but once they pass through the Shaoyang (Lesser Yang) channel, they are all treated according to the principles of Chaihu Tang (Bupleurum Decoction), with no further distinction. If at that time one were to point out that Wind and Cold use the same treatment method, would scholars of Shanghan (Cold Damage diseases) approve of this? Therefore, it is correct to say that Zhang Zhongjing's formulas can treat Wenyue (Warm Heat diseases), but incorrect to say that his book discusses Wenyue (Warm Heat diseases). The medicinal substances in heaven and earth are limited in number. If Shanghan (Cold Damage diseases) has formed interior heat, cooling and neutralizing agents are certainly appropriate; if Wenyue (Warm Heat diseases) involves exterior cold, warming and dispersing agents are also required. Flexible application and adaptive strategies cannot be resolved by verbal debate alone.

Beyond listing the pulse methods for the four types of Wenbing (Warm Diseases), Zhang Zhongjing only mentions the qi aspect of Dongwen (Winter Warmth) and does not list Wet Warmth (Shiwenzhong) as a category. This is because Zhang Zhongjing's book is named after Shanghan (Cold Damage diseases); only those warmth diseases accompanied by cold are discussed. If it is Dongwen (Winter Warmth), there is warmth without cold; if it is Shiwenzhong (Wet Warmth), it involves dampness rather than cold. According to the structural rules, these do not belong in this book, hence they are not discussed. The "dampness" in the Dampness chapter, although originating from dampness, is completely dissimilar to Shiwenzhong (Wet Warmth). The pulse and symptoms of Shiwenzhong (Wet Warmth) are naturally recorded in Nanjing (Classic of Difficult Issues) and Maicheng (Pulse Classic), and should not be confused. Moreover, Zhang Zhongjing explicitly stated in the Dampness chapter that it resembles Shanghan (Cold Damage diseases), which is why it is mentioned here. The similarity refers to body pain. The beginning of the chapter also states that it should be discussed separately, indicating that its structural system is distinct and not mixed, which can be considered rigorous. How can one equate Dampness with Shiwenzhong (Wet Warmth) and forcibly interpret the statement "Shanghan (Cold Damage diseases) includes five types" from Nanjing (Classic of Difficult Issues)? Furthermore, before discussing the four types of Wenbing (Warm Diseases), the text says: "Dongwen (Winter Warmth) has early and late stages, overlapping, with varying severity and different treatments, as described in the following chapter"; and after discussing the four types of Wenbing (Warm Diseases), it says: "This is because winter injury by cold transforms into Wenbing (Warm Disease); the transmission and treatment of the disease are as explained." These two passages appear contradictory at first glance but align perfectly with my explanation. Generally, Dongwen (Winter Warmth) remains latent and does not immediately manifest because it is constrained by the cold of healthy qi. Lingshu (Spiritual Pivot) and Suwen (Basic Questions) only mention Wenbing (Warm Disease) resulting from winter injury by cold, not Wenbing (Warm Disease) resulting from winter exposure to warmth. This is precisely because the constraining cold later falls under the specific injury by cold. Although the wording is integrated, the meaning is particularly extended. Learners must understand this, so that Zhang Zhongjing's article here, as well as statements about Chunwen (Spring Warmth) in Bingyuan (Source of Diseases), Qianjin Fang (Essential Prescriptions Worth a Thousand Gold), and Waitai Miyao (Secret Essentials of the Outer Terrace), can be clearly understood one by one.