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Zhang Zhongjing regarded wind, dampness, cold, and summerheat as the four major categories of pathogenic factors causing disease. Since he had already written *Shanghan Lun* (Treatise on Cold Damage) and named the book after "cold damage," yet failed to distinguish clearly how wind, dampness, and summerheat cause diseases, it was impossible to clarify that his discussion was specifically designed for cold damage. Therefore, he presented discussions distinct from cold damage. He first listed wind strike (Zhongfeng), then dampness, then warm disease (Wenbing). If one strictly follows the sequence of wind, dampness, and summerheat and compiles them into one chapter, the so-called wind disease refers specifically to diseases caused by wind pathogens. The *Qianjin Yaofang* states: "In Taiyang wind strike, if one is additionally affected by cold and dampness, it becomes wind-damp bi syndrome." From this, we know that although such diseases may also originate from transformation of cold damage, they ultimately have their own primary etiology. By extension, the same logic applies to dampness and warm diseases. When it is said that they are similar to cold damage, it refers to similarity in clinical manifestations, not in the mode of infection. The similarities in manifestations include aversion to cold in wind strike, body pain in dampness, and aversion to cold with fever in warm diseases. The purport of this chapter differs from chapters discussing Huoluan (cholera-like disorder) and Ouyue (vomiting and hiccups). Although the diseases listed in those chapters also have their own primary etiologies, these primary causes do not resemble cold damage at the onset. Moreover, symptoms caused by any of the four pathogens—wind, dampness, cold, and summerheat—may occur; thus, only those related to cold are discussed to exhaustively cover the variations of cold-induced diseases, which do not necessarily begin with aversion to cold and fever. In contrast, conditions beginning with aversion to cold and fever, such as wind strike, dampness, and warm diseases, do not necessarily originate from cold damage. Therefore, each is listed separately with its specific primary cause and distinguished accordingly: "Taiyang-induced wind strike, dampness, and warm diseases should be discussed separately."

The phrase "should be discussed separately" indicates that *Shanghan Lun* is specifically dedicated to cold damage. This is why I once stated that Zhang Zhongjing's ability to thoroughly expound the variations of cold damage lies in this distinction.

In the Taiyang Chapter of *Shanghan Lun*, three main points regarding cold-induced diseases are prominently listed. First is wind strike, which addresses one aspect of pathogens involving both cold and heat; second is cold damage (Shanghan), representing the orthodox concept of cold pathogens; and third is warm disease (Wenbing), addressing diseases where heat is combined with cold, focusing on the combined aspect. To fully cover cold-induced diseases, these three must be listed. Although warm disease and wind-warm disease (Fengwen) differ, they share the characteristic of latent onset and the name "warm," so they are combined into one section under the general heading of Taiyang disease. As a Taiyang disease, it presents with stiffness and pain in the head and neck because it arises due to cold pathogens. The textual structure places warm disease first and subordinates wind-warm disease to it, demonstrating rigorous methodology. Since heat combined with cold should primarily be categorized as warm disease rather than by the combined pathogen, only pulse and symptom descriptions are provided here, without further detailed discussion on warm or wind-warm diseases as frequently done for wind strike and cold damage. The principles and stylistic conventions clearly show hierarchy; one cannot claim it discusses warm-heat diseases based solely on this. Conditions like body pain in dampness or aversion to cold in heat are included only because they mimic cold damage clinically, whereas their actual causes are dampness and heat, not cold. These are fundamentally different from the three prominent categories and are therefore discussed separately, not in the same chapter as wind strike, cold damage, or warm disease. Observing this arrangement reveals the author's intent. Some scholars, citing the *Nan Jing* statement that "there are five types of cold damage," attempt to categorize wet-warm (Shiwen) within this text, ignoring that the pulse of dampness (floating and weak yang, small and rapid yin) does not match the deep and fine pulse; similarly, they classify heat disease as internal heat, ignoring that the pulse of heat (floating and slippery when pressed lightly, scattered and choppy when pressed deeply) does not match the weak, string-taut and fine, or slow pulses. How can they realize that the *Nan Jing* merely summarizes categories for theoretical pairing? Compared to works specifically dedicated to exhaustively detailing cold damage variations, its precision and roughness cannot be compared.