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[General Principles]

1. There have been many authors compiling treatises on *Shanghan* (Cold Damage). Those who only revere Zhang Zhongjing's works while neglecting the supplementary methods of later sages commit the error of excessive antiquarianism; such books include *Lei Zheng Shu*. They cater merely to vulgar convenience, mixing elegant and coarse styles indistinguishably like water and milk, leaving the world unaware of what truly belongs to Zhang Zhongjing. This is the fallacy of mediocre practitioners; such books include *Suo Yan Yun Yao* and others. Only Lou Quanshan's *Gangmu* lists the primary diseases of the Six Channels at the beginning, followed by combined diseases, concurrent diseases, and various deteriorated conditions after sweating, vomiting, or purging therapies. It further categorizes diseases altered by seasonal pathogens and those affecting women and infants. Within each entry, it meticulously records Zhang Zhongjing's methods before appending the supplementary methods of later sages. Thus, it encompasses a hundred schools without confusion, and its principles are unsurpassed. The chapter structure of this book largely follows it.

2. Wang Shuhe, in editing Zhang Zhongjing's *Shanghan Lun*, established chapters for the Three Yang (Taiyang, Yangming, Shaoyang) and Three Yin (Taiyin, Shaoyin, Jueyin). His rule for the Three Yang chapters was: any condition Zhang Zhongjing termed "Taiyang Disease" was placed in the Taiyang chapter; "Yangming Disease" in the Yangming chapter; and "Shaoyang Disease" in the Shaoyang chapter. The Three Yin chapters followed this same logic. However, if Zhang Zhongjing did not use these specific names but described a cold damage condition with a specific formula scattered across chapters, conditions belonging to Yang syndromes—such as fever, chest binding, palpitations, blood stasis, and epistaxis—were mixed into the Taiyang chapter. Conditions belonging to Yin syndromes—such as cold extremities, diarrhea, and vomiting—were mixed into the Jueyin chapter. Only conditions like dry feces, hard stool, inability to defecate, or difficult defecation were exclusively placed in the Yangming chapter, despite lacking specific naming, because they belong to Yangming Stomach excess and cannot be categorized under Taiyang or Jueyin. This is because Taiyang is the head of the Three Yang; all Yangming and Shaoyin diseases originate from Taiyang transmission. Therefore, all unnamed Yang conditions were grouped into the Taiyang chapter. Jueyin is the tail of the Three Yin; all Taiyin and Shaoyin diseases transmit to Jueyin at their peak. Therefore, all unnamed Yin conditions were grouped into the Jueyin chapter. Later scholars failed to understand this logic, erroneously assuming that unnamed conditions in the Taiyang chapter belonged to Taiyang, thereby distorting the truth of Taiyang disease, and similarly distorting Jueyin disease. This greatly deviates from Zhang Zhongjing's methodology. Currently, the classification of conditions by channel in this text retains much of Wang Shuhe's original arrangement. Students should reflect deeply to clarify these points.

3. Zhang Zhongjing established his legal framework thus: Whenever he stated "Taiyang Disease," he referred to floating pulse, stiffness and pain in the head and neck, and aversion to cold. "Yangming Disease" referred to fullness and excess in the stomach/intestines (Wei Jia Shi). "Shaoyang Disease" referred to bitter taste in the mouth, dry throat, and vertigo. "Taiyin Disease" referred to abdominal fullness, intermittent pain, vomiting, and diarrhea. "Shaoyin Disease" referred to faint and thin pulse, and a desire to sleep. "Jueyin Disease" referred to Qi rushing upward hitting the heart, heart pain, and vomiting roundworms. In cases like Shaoyin Disease, he did not repeat "faint and thin pulse, desire to sleep" in every line but summarized them with the term "Shaoyin Disease" to save space. For instance, when a line states "Shaoyin Disease with contrary fever and deep pulse, use Mahuang Fuzi Xixin Tang," it implies the patient has a deep, thin pulse and desire to sleep, plus contrary fever, warranting this formula. When it states "Shaoyin Disease, two to three days later, restlessness and insomnia, use Huanglian Ejiao Tang," it implies the patient had the initial Shaoyin signs for two to three days, which then transformed into restlessness and insomnia, warranting this formula. Later scholars failed to grasp this, ignoring the core symptoms encapsulated by "Shaoyin Disease." They indiscriminately used Mahuang Fuzi Xixin Tang for any fever with deep pulse, and Huanglian Ejiao Tang for any restlessness and insomnia, a grave deviation from Zhang Zhongjing's methods.

4. Among commentators on Zhang Zhongjing's work, Cheng Wuji is the most detailed. Although occasionally self-contradictory in his literal explanations, these are minor flaws in an otherwise flawless jade, not detracting from its immense value. Later scholars like Zhao Sizhen and Zhang Jianshan made significant contributions and can be considered loyal followers of Cheng's school. Their insights are extensively cited here to provide clarity for students, along with some of my own modest observations. Texts that are straightforward require no annotation. Abbreviations used: "Zhao" refers to Sizhen; "Zhang" to Jianshan; "Huang" to Zhongli; "Huo" to Zhu Gong's *Huoren Shu*; "Pang" to Anshi; "Xu" to Shuwei's *Xueshi*; "Ben" to Xu's *Benshi Fang*; "Han" to He; "Sun" to Zhao; "Jie" to Jiegu (Zhang Yuansu); "Yun" to Yunqizi (son of Jiegu); "Yuan" to Li Dongyuan; "Dan" to Zhu Danxi; "Hai" to Wang Haicang; "Wang" to Lu; "Luo" to Tianyi; "Dai" to Yuanli; "Lou" to Quanshan; "Wu" to Shou; "Tao" to Hua. Entries without surnames, except for the initial diagnostic phrases, are quotes from Zhang Zhongjing.

5. Zhang Zhongjing's prescriptions often weigh in jin (pounds), using units like sheng, he, and mei. Due to differences in ancient and modern weights and measures, direct application is difficult. The Bureau Formulary *Gangmu* reduced dosages significantly (e.g., five qian per dose), making them too small. Tao and Wu completely altered ancient formulas for contemporary use, increasing the error. This book retains Zhang Zhongjing's original dosages, advising practitioners to adjust flexibly based on condition and season. Ancient formulas should be applied with discernment, not just Zhang's. Chen Wuyue's use of the *Qian Pu* to deduce measurements is practical and cited here for reference. Length units: Fen, Cun, Chi, Zhang, Yin. One fen equals the width of one grain of millet. Ten fen make one cun; ten cun make one chi; ten chi make one zhang; ten zhang make one yin. Historical rulers varied: Zhou chi was 8 cun, Jing chi 16 cun, Huai chi 12 cun, Yue chi 12.5 cun. The small chi is taken as the standard. Kaiyuan Tongbao coins from Tang Wude era had a diameter of 8 fen; twelve and a half coins weighed one chi. Volume units: Yue, He, Sheng, Dou, Hu. Based on the Huangzhong Yue holding 12 zhu. Two yues make one he, weighing 24 zhu. Using coin standards, four 6-zhu coins equal the weight of three Kaiyuan coins. Han and Tang used similar volume measures. By Song Shaoxing era, one sheng held 1200 zhu (equivalent to 200 ancient 6-zhu coins or 150 Kaiyuan coins), where one Shaoxing sheng equaled five Han shengs. Weight units: Zhu, Liang, Jin, Jun, Shi. Twelve zhu make one liang (historically defined differently); sixteen liang make one jin; thirty jin make one jun; four jun make one shi. In Song Guangcheng, ten Kaiyuan coins equaled one liang. Thus, three current liang equal ten Han/Tang liang. *Qianjin Yaofang* and *Bencao* convert ancient 3 liang to current 1 liang, and ancient 3 sheng to current 1 sheng, causing confusion. For example, Banxia (Pinellia Rhizome) 1 sheng equals 5 liang, but which sheng and liang? This is crucial for compounding. Han copper coins resembled Zhou coins, inscribed "Banliang." Wen Emperor minted lighter 4-zhu coins. Later, Wuzhu coins were cast with raised edges to prevent shaving. Two Banliang coins equaled one liang, weighing 10 zhu. Han/Tang standard was 24 zhu per liang. *Qian Pu* shows no 6-zhu coins in Han, appearing in Tang. Sixteen Wuzhu coins equal ten Kaiyuan coins in weight; twelve 6-zhu coins equal nine Kaiyuan coins. Kaiyuan coins weigh 8 zhu each. Tang Wude Kaiyuan Tongbao weighed 2.4 zhu; ten coins make one liang. Historical analysis suggests Han formulas used larger doses. Decoctions used 30+ liang for large doses, boiled down from 6-7 sheng of water to 2-3 sheng, divided into three doses. If using modern weights/volumes, this seems excessive. Powders were taken in smaller amounts (e.g., Fangcun Dao Gui). Fengyin Tang used 55 liang total, taken in small scoops. Modern speculation suggests Han "one liang" might equal two Banliang coins. Calculations show variations: Han method yields ~7.5 qian per dose for Shufu Tang; Tang method yields ~14 qian; Kaiyuan standard yields ~35 qian per dose. Wu Shou notes: 24 zhu = 1 liang; 1 liang = 4 fen; 6 zhu = 1 fen = 2.5 qian. "Zi" unit: 1 qian = 4 zi; 1 zi = 2.5 li. Practitioners must adapt to times, seasons, regions, drug quality, and patient constitution. Daxianxiong Tang uses 6 liang Dahuang; today 6 qian suffices for robust patients, less for weak ones. Xiaoshao (Magnolia Bark) 1 sheng; today 2-3 qian suffices. Gansui (Kansui Root) 2 zhi; today 1 fen or 0.5 fen suffices. Rigidity leads to death; caution is paramount.

6. *Neijing* states: "Wind, rain, cold, and heat cannot harm alone without deficiency." Danxi added: "Eight or nine out of ten Shanghan cases stem from internal injury; tonifying Yuan Qi is primary." Consequently, later practitioners, knowing Zhang's methods but ignoring the root in internal deficiency, often killed patients by using sweating and purging unnecessarily. This is akin to murder. Though I append later tonification methods, words cannot fully convey intent. Physicians must respect life, study this book thoroughly, and act with caution. Better to over-protect Yuan Qi than to recklessly sweat or purge.

7. Tu Peng's *Sishi Zhiyao* advises distinguishing Yin and Yang by observing pulses, form, breathing, and voice, and diagnosing via Cun and Chi positions. One must carefully assess excess and deficiency before treating. Like *Huoren Shu*, if Da Chengqi Tang is indicated, test with Xiao Chengqi Tang first; if Dahu Chaihu Tang is needed, test with Xiao Chaihu Tang first; for clear Yin syndrome requiring Sini Tang, test with Lizhong Tang or Zhenwu Tang first. These are key strategies of great sages. However, decoctions and pills are matters of life and death in the fleeting moments of Shanghan. Is "testing" appropriate? Better to be cautious than reckless. Zhang Rui, a Song dynasty divine physician, treated a Shanghan case with extreme heat signs. He prepared Chengqi Tang but hesitated repeatedly. The patient suddenly shivered, covered himself with multiple blankets, sweated profusely, and recovered spontaneously. Had he taken the medicine, he would have died. Thus, Tu's "testing" method, while not strictly Zhang's intent, serves as a warning against rashness by mediocre doctors.