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Since Huangdi (Yellow Emperor) and Qibo established medical theories, and Zhang Zhongjing formulated laws for syndrome differentiation and treatment, they became the ancestors of medicine for later generations. Among them, *Shanghan Lun* (Treatise on Cold Damage) is particularly comprehensive in its prescriptions and curative for all diseases, truly being the supreme treasure of the medical field. However, there are over a hundred commentaries on *Shanghan Lun*, with conflicting views and mutual contradictions. Moreover, the order of chapters and sections has been arbitrarily disrupted, causing readers to be confused and dazzled, unable to know which school of thought to follow. I read Xu Lingtai's *Shanghan Leifang* (Classified Formulas for Cold Damage), seeing that it traces the source from the flow, removing all繁杂 (complex/irrelevant) details, which seemed concise and worthy of adoption. However, it only classified by formulas, without distinguishing between exterior (Biao), interior (Li), cold (Han), heat (Re), deficiency (Xu), and excess (Shi) syndromes. Having studied *Shanghan Lun* attentively for over ten years, pondering day and night, I gained considerable insights. Therefore, I manually compiled this volume. The beginning still follows Huang Yuanyu's *Shanghan Xuanjie* (Mystic Explanation of Shanghan), clarifying the outlines of the Six Channels (Taiyang, Yangming, Shaoyang, Taiyin, Shaoyin, Jueyin). It specifies which syndrome should appear for each channel and which formula should be applied for each syndrome, clearly categorized so that everything is clear at a glance. Later, the content was divided into sixteen syndrome types, classifying formulas according to syndromes, and clearly listing the specific syndromes (Zhuan Zheng) and accompanying syndromes (Jian Zheng) of exterior, interior, cold, heat, deficiency, and excess. Within each category, the syndrome is first discussed, followed by the list of formulas, along with excerpts from Huang Yuanyu's formula explanations, striving for clarity and conciseness. This allows later readers of *Shanghan Lun* to identify syndromes by channel and find formulas by syndrome, logically coherent, thus avoiding the fear of being overwhelmed by the vastness of medical knowledge.

Preface by Yun Ge Shi on the 6th day of the second month of Yiwu year, Guangxu 21st Year (1895).

When Taiyang disease occurs, the pulse is floating, accompanied by stiffness and pain in the head and nape, and aversion to cold. In Taiyang disease, if there is fever, sweating, aversion to wind, and a slow pulse, it is named Wind Strike (Zhong Feng). In Taiyang disease, whether fever has already appeared or not, but inevitably with aversion to cold, body pain, vomiting and rebellious qi, and tight pulses in both yin and yang positions (cun and chi), it is named Cold Damage (Shang Han).

Diseases presenting with fever and aversion to cold originate from Yang channels; those without fever but with aversion to cold originate from Yin channels. Those originating from Yang heal in seven days; those originating from Yin heal in six days. This is because the number for Yang is seven, and for Yin is six. If a patient has high body heat but desires to wrap themselves in clothes, it indicates heat in the skin and flesh, and cold in the bone marrow. If a patient has low body temperature but does not desire to wrap themselves in clothes, it indicates cold in the skin and flesh, and heat in the bone marrow.

Note: Taiyang governs with Cold Water energy, covering the external skin and hair, protecting the whole body, serving as the outline of the Six Channels; hence its pulse is floating. Once attacked by Wind-Cold, the skin and hair become closed, and this channel is the first to be diseased. The channel starts from the inner canthus of the eyes, goes down from the head to the neck, travels along the back, flanks the spine to the waist, and runs from the lateral malleolus to the little toe. Bound by external Wind-Cold, the meridians do not flow smoothly, resulting in pain in the head, nape, waist, spine, bones, and tendons. Its pulse connects to the Fengfu (GV16) acupoint of the Du Meridian, located at the back of the head. This aperture is often open; when Wind-Cold attacks humans, it enters through the Fengfu acupoint and transmits to the Taiyang channel. The Liver governs Ying-Nutrient Blood, circulating in the meridians; the Lung governs Wei-Defensive Qi, circulating in the skin and hair; and both are unified under Taiyang. Wind injures Wei-Qi, Cold injures Ying-Blood. When Ying and Wei are damaged by pathogens, Taiyang disease occurs.

Note: For the primary Wind Strike of the Taiyang channel, Guizhi Tang (Cinnamon Twig Decoction) is used. For Cold Damage, Mahuang Tang (Ephedra Decoction) is used. For simultaneous contraction of Wind and Cold, Guizhi Mahuang Ban Tang (Half Cinnamon Twig and Ephedra Decoction) and Guizhi Er Mahuang Yi Tang (Two Parts Cinnamon Twig and One Part Ephedra Decoction) are used. For Wind Strike with internal Fire Stagnation, Da Qinglong Tang (Great Blue Dragon Decoction) and Guizhi Er Yebi Yi Tang (Two Parts Cinnamon Twig and One Part Bitter Orange Decoction) are used. For Cold Damage with internal Water Stagnation, Xiao Qinglong Tang (Minor Blue Dragon Decoction) is used. After the exterior is resolved and internal dryness remains, Baihu Tang (White Tiger Decoction) and Baihu Jia Renshen Tang (White Tiger Decoction plus Ginseng) are used. While the exterior is unresolved but dampness exists in the interior, Wuling San (Five-Ling Powder) and Fuling Gancao Jiangtang (Poria, Licorice, and Ginger Decoction) are used. When the exterior recedes and heat knots in the Blood aspect, Taohe Chengqi Tang (Peach Kernel and Rhubarb Decoction) and Didang Tang/Wan (Di Dang Decoction/Pill) are used.