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The treatment methods for Shanghan (Cold Damage) and Wenbing (Warm Diseases) initially appear different but ultimately converge. Regarding the site of pathogenic invasion, it lies primarily in the Foot meridians and extends to the Hand meridians. However, contemporary discussions on Cold and Warm diseases often claim that Shanghan invades only the Foot meridians and not the Hand meridians, while Wenbing invades only the Hand meridians and not the Foot meridians. The twelve meridians of the hands and feet are originally interconnected; claiming that Shanghan enters the Foot meridians but not the Hand meridians is indeed erroneous, and claiming that Wenbing enters the Hand meridians but not the Foot meridians is particularly absurd. Why is this so? At the beginning of *Shanghan Lun* (Treatise on Cold Damage), the first section generally discusses "Taiyang disease" (Disease of the Taiyang). This "Taiyang" actually encompasses Zhongfeng (Wind Strike), Shanghan, and Wenbing. Therefore, the subsequent sections divide Taiyang disease into three categories: Section 2 discusses Taiyang Zhongfeng, Section 3 discusses Taiyang Shanghan (Sections 4 and 5 also discuss Shanghan and should be categorized under Section 3), and Section 6 discusses Taiyang Wenbing. Thus, each section begins with the phrase "Taiyang disease." Does this refer to the Hand Taiyang or the Foot Taiyang? This is beyond doubt. From this, we know that Zhongfeng, Shanghan, and Wenbing can all be collectively referred to as "Shanghan" (*Nanjing* states there are five types of Shanghan, including Zhongfeng and Wenbing), and their initial onset occurs in the Foot Taiyang meridian, allowing them to be collectively termed "Taiyang disease." In the case of Zhongfeng or Shanghan, the three symptoms of headache, neck stiffness, and aversion to cold may appear together. In the case of Wenbing, even mild aversion to cold suffices to diagnose Taiyang disease (here, it is not necessary for all symptoms to be present; observing one symptom is sufficient to determine the affected meridian). However, the aversion to cold quickly transforms into fever.

I once treated a patient who woke up shivering due to thin bedding during sleep in late spring, feeling whole-body aversion to cold until around 10 AM, when he felt intense heat. His pulse was floating and surging. I administered my formulated Liangjie Tang (Cooling and Resolving Decoction), and he recovered after sweating once. I also once treated another patient who went out in early summer morning rain, resulting in headache and whole-body aversion to cold. By 1 PM, this transformed into high fever, thirst, and a desire to drink water. His pulse was surging and slippery. I administered my formulated Hanjie Tang (Cold Resolving Decoction), and he recovered after sweating once. The reason such cooling herbs could induce sweating is that the internal dry-heat combined with the cooling and moistening properties of the herbs, naturally inducing sweat. Additionally, using small amounts of surface-releasing herbs as guides facilitated rapid sweating, after which the heat completely dissipated. These two cases were both Wenbing; because they initially presented with momentary aversion to cold, they could still be classified under Taiyang disease. Even after transforming into heat and involving the Yangming, the pathogen must first enter the Foot Yangming meridian. Only after transmitting from the stomach to the intestines, causing dry fecal impaction, does it then enter the Hand Yangming meridian. How can one say Wenbing enters only the Hand meridians and not the Foot meridians?

Thus, *Shanghan Lun* originally divided Zhongfeng, Shanghan, and Wenbing into three equal parts, detailing them specifically in the first chapter of Taiyang to show the correct entry point. In later sections discussing treatments, all syndromes within these three categories can be collectively summarized under the Six Meridians. It simply states which formula is suitable for a specific disease manifestation in a certain meridian, without distinguishing between Zhongfeng, Shanghan, or Wenbing. This is a method of simplifying complexity and grasping the essentials. It is important to note that when a section explicitly mentions "Zhongfeng," it refers strictly to Zhongfeng. When it explicitly mentions "Shanghan," it often collectively refers to Zhongfeng and Wenbing. The term "Shanghan" serves as a general title for the three categories. Distinctions among Zhongfeng, Shanghan, and Wenbing are usually made when discussing pulses. Among the formulas listed under the Six Meridians, those suitable for Wenbing are too numerous to list; here, I will briefly mention the most obvious ones.

One is Maxing Gan Shi Tang (Ephedra, Apricot Seed, Licorice, and Gypsum Decoction). Originally used for sweating with wheezing and no significant fever. When treating Wenbing, sweating and wheezing are not required; it can be used if the exterior is unresolved and there is internal latent heat. However, dosage must be adjusted based on heat severity. For mild heat, use 1.5 qian of Mahuang (Ephedrae Herba) and 6 qian of Sheng Shigao (Raw Gypsum). For severe heat, use 1 qian of Mahuang and 1 liang of Sheng Shigao. In my practice, I often substitute Bohe Ye (Menthae Haplocalycis Folium) for Mahuang (doubling the dosage when substituting). After taking it, slight sweating leads to recovery. Bohe Ye is an excellent herb for releasing the exterior in Wenbing, but it was not listed in materia medica during Zhang Zhongjing's time, hence its absence in his formulas.

Another is Da Qing Long Tang (Major Azure Dragon Decoction). *Shanghan Lun* uses this formula in two sections. Section 37 states "Taiyang Zhongfeng, pulse floating and tight." The first section of *Shanghan Lun* describes the Taiyang pulse as "floating," covering both Zhongfeng and Shanghan. Section 2 specifies that a slow pulse indicates Zhongfeng (floating-slow), while Section 3 specifies that a tight pulse at both cun and chi positions indicates Shanghan (floating-tight). Here, although labeled Zhongfeng, the pulse is floating-tight, indicating a cold pattern rather than Wenbing. Section 38, however, upon close examination, clearly describes Wenbing. Why? Because the pulse is floating-slow, the body is not painful but heavy, and there are no Shaoyin signs. Although it begins with "Shanghan," this term is used as a collective label. Initial Shanghan presents with a floating-tight pulse and body pain, whereas initial Wenbing presents with a floating-slow pulse and body heaviness without pain (*Shanghan Lun* Section 6 explicitly mentions body heaviness for Wenbing). Shanghan may involve Shaoyin patterns, but Wenbing does not (Shaoyin patterns include cold and heat; here, the absence of Shaoyin-cold allows the use of Da Qing Long Tang; Shaoyin-heat is common in Wenbing and does not contraindicate it). These are clear signs of Wenbing. Furthermore, if symptoms temporarily improve, Shanghan would not warrant heavy use of Sheng Shigao (Raw Gypsum), but Wenbing allows for large doses (equivalent to four modern liang) to clear dry-heat and preserve yin. In my practice, I often substitute Lianqiao (Forsythiae Fructus) for Guizhi (Cinnamomi Ramulus). While both expel exterior pathogens, Guizhi is hot and Lianqiao is cool; Wenbing requires coolness, making Lianqiao preferable. Zhongjing did not use it because it was not in the materia medica then (Lianqiao Gen, the root, promotes urination but does not induce sweating). Also, Guizhi dosage in Da Qing Long Tang is only one-third of Mahuang because Zhongjing avoided excessive heat.

Another is Xiao Qing Long Tang (Minor Azure Dragon Decoction). It releases the exterior and eliminates fluid retention, effective for external contraction with phlegm-wheezing in Zhongfeng, Shanghan, and Wenbing. However, adding Sheng Shigao (Raw Gypsum) is advisable to balance the heat of Mahuang, Guizhi, Ganjiang (Zingiberis Rhizoma Recens), and Xixin (Asari Radix et Rhizoma). *Shanghan Lun* lacks this addition, but *Jingui Yaolue* includes Xiao Qing Long Jia Shigao Tang (Minor Azure Dragon Decoction plus Gypsum) to supplement *Shanghan Lun*. In my practice, for cases with substantial heat, I add over 1 liang of Sheng Shigao.

Another is Xiao Chai Hu Tang (Minor Bupleurum Decoction). Suitable for Zhongfeng and Shanghan. In Wenbing, Xiao Chai Hu Tang syndrome often involves vomiting sticky saliva, caused by the combination of Shaoyang fire and Taiyin dampness (Shaoyang transmits to Taiyin). Adding several qian to 1 liang of Sheng Shigao clears Shaoyang fire, converting sticky saliva into urine. Chaihu (Bupleuri Radix) guides pathogens upward, while Shigao directs heat downward, achieving dispersion through upper and lower pathways. Recovery occurs without sweating.

The above formulas are mostly suitable for early-stage Wenbing. For advanced stages with deep transmission, formulas like Baihu Tang (White Tiger Decoction), Baihu Jia Renshen Tang (White Tiger plus Ginseng Decoction) for clearing dry-heat; Da Chengqi Tang (Major Order the Qi Decoction) and Xiao Chengqi Tang (Minor Order the Qi Decoction) for intestinal accumulation; Da Xiongan Tang (Major Chest Binder Decoction) and Xiao Xiongan Tang (Minor Chest Binder Decoction) for chest obstruction; Baitouweng Tang (Pulsatilla Decoction) and Huangqin Tang (Scutellaria Decoction) for dysentery; Yinchen Hao Tang (Artemisia Capillaris Decoction) and Zhizi Baipi Tang (Gardenia and Phellodendron Bark Decoction) for jaundice; and all cooling, moistening, fire-clearing, yin-nourishing, and spirit-calming agents are applicable to Wenbing, requiring no further elaboration.

Regarding Wenbing caused by latent qi, such as "Winter injury by cold leads to Wenbing in Spring" or "Failure to store essence in winter leads to Wenbing in Spring" mentioned in *Neijing*, *Shanghan Lun* contains these syndromes. When manifestations appear in a specific meridian, they are indistinguishable from that meridian's primary disease. Zhongjing did not explicitly distinguish them, making differentiation difficult later. Moreover, the treatment is identical to the primary disease of that meridian, so distinction is unnecessary. Differentiation is easiest when the disease is in Shaoyin. Shaoyin diseases split into cold and heat paths. Cold is the primary Shaoyin Shanghan; heat is largely latent qi transforming into Wenbing. If it were Shanghan transforming into heat after entering Shaoyin, why are Huanglian Ejiao Tang (Coptis and Egg Yolk Decoction) and Da Chengqi Tang indicated within two to three days of Shaoyin disease? Latent qi resides in the Sanjiao adipose tissue, connected to all hand and foot meridians. When spring yang generates heat, it moves toward weak organs, as stated: "Where evil gathers, qi is deficient." If essence was not stored in winter, Shaoyin is weak, allowing latent heat to invade, suppressing kidney qi from ascending to connect with heart qi. This causes weak cardiac pulsation and a fine, minute Shaoyin pulse. The finer the pulse, the more severe the internal dry-heat. Huanglian clears Shaoyin heat; Ejiao (Donkey-hide Gelatin) and Jizihuang (Chicken Egg Yolk) nourish Shaoyin fluids, assisting kidney qi ascent and reconnecting yin and yang. The pulse rapidly improves, and trapped heat emerges externally. In such cases, I often adapt Zhongjing’s principles by using 4 liang of fresh Baimaogen (Imperatae Rhizoma), chopped and slowly boiled until it sinks. Straining yields one large bowl of clear decoction taken at once. The fine pulse instantly becomes surging and forceful. Subsequently, a large dose of Baihu Jia Renshen Tang is prepared, divided into three warm doses, with one raw chicken egg yolk mixed into each dose. The disease resolves completely. Using ancient formulas need not mean rigid adherence; if Zhongjing were alive, he would not blame me.