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All diseases fall within the scope of Shanghan (Cold Damage). In terms of the originator of Shanghan studies, Zhang Zhongjing is undoubtedly the foremost figure. However, later scholars often critique Zhang Zhongjing's work, stating that it details Wind-Cold (Feng-Han) but neglects Warmth-Heat (Wen-Re).

I contend that this view demonstrates not only a lack of understanding of Zhang Zhongjing but also a fundamental misunderstanding of Shanghan. Zhang Zhongjing composed the *Shanghan Lun* (Treatise on Cold Damage) based on texts such as the *Suwen* (Basic Questions) and the *Nanjing* (Classic of Difficult Issues). According to the *Nanjing*, "Shanghan comprises five types": 1. Zhongfeng (Wind Strike), 2. Shanghan (Cold Damage), 3. Shiwen (Damp-Warmth), 4. Wenbing (Warm Disease), and 5. Rebing (Heat Disease). The suffering associated with each manifests differently. Since it is stated that "Shanghan has five types," "Shanghan" serves merely as the general category name for these diseases. Within these five categories, the etiology is not exclusively cold. Etiologies such as Wind, Dampness, Warmth, and Heat all fall under the five branches of the broad concept of Shanghan. Zhang Zhongjing named his treatise "Shanghan" precisely because its meaning encompasses this broader classification.

By cross-referencing Zhang Zhongjing's original text repeatedly, it becomes evident that his major principles align perfectly with the framework of "Shanghan has five types" from the *Nanjing*. His diagnostic method generally begins with the differentiation of Taiyang disease (disease pattern resulting from pathogenic invasion of the Foot-Taiyang Bladder meridian). For instance, he states: "In Taiyang disease, if there is fever, sweating, aversion to wind, and a moderate pulse, it is named Zhongfeng." "In Taiyang disease, whether fever has already appeared or not, there must be aversion to cold, heaviness of the body, vomiting, and a tight pulse at both yin and yang positions; this is named Shanghan." "In Taiyang disease, if there is fever and thirst without aversion to cold, it is named Wenbing." "In Taiyang disease, if there is joint pain, irritability, and a deep, fine pulse, it is named Shibi (Damp Bi)." "Taiyang Zhongre refers to Ye disease (heatstroke); the patient exhibits sweating, aversion to cold, high fever, and thirst." This distribution corresponds clearly to the five types of Shanghan outlined in the *Nanjing*, with distinct boundaries.

The term "Shanghan" in Zhang Zhongjing's *Shanghan Lun* refers to the broad sense of Shanghan as defined in the *Nanjing*'s "five types." However, within the category of Shanghan, there is a specific presentation: Taiyang disease where fever may or may not have occurred, accompanied by inevitable aversion to cold, body heaviness, vomiting, and a tight pulse at both yin and yang positions, which is specifically designated as "Shanghan." Other conditions caused by Wind, Dampness, Warmth, or Heat belong to the broader category of Shanghan but bear different names. To understand the disease of Shanghan, one must first clarify the definition of the name. As the saying goes, "If the name is not correct, language is not in accordance with truth." Therefore, I urgently seek to rectify this nomenclature and place it at the beginning of this chapter.