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The *Huangdi Neijing* (Yellow Emperor's Inner Canon) states that heat diseases all belong to the category of Shanghan (Cold Damage). This does not mean they are merely similar to Shanghan, but rather that they belong to the same class of diseases. Shanghan is named because it results from injury by the cold of the seasonal climate; Wenbing (Warm Disease) and Rebing (Heat Disease) also change their names according to the season! The classics state: "If one is injured by cold in winter, one will develop a heat disease." This refers to illness occurring at the time of exposure. The classics further state: "If one is injured by cold in winter, one will surely develop Wenbing in spring." This refers to illness occurring after a delay. The classics also say: "For those who contract Shanghan and transform into Wenbing, if the illness occurs before the Summer Solstice, it is called Wenbing; if it occurs after the Summer Solstice, it is called Shu (Summer Heat) disease. Shu is synonymous with heat." This also refers to illness occurring at the time of exposure. Therefore, before the Autumn Equinox, all can be named Rebing (Heat Disease); after the Autumn Equinox, all can be named Shanghan (Cold Damage). This is how Xuanyuan (the Yellow Emperor), Qibo, and Zhang Zhongjing established the nomenclature for Shanghan, Wenbing, and Rebing. The classics further say: "Those whose essence is stored securely will not suffer from Wenbing in spring." This clarifies the reason for not falling ill when the illness does not occur out of season. The classics also state: "If one fails to store essence in winter, one will surely suffer from Wenbing in spring." This clarifies the cause of inevitable illness when failing to store essence. From this, we can understand that for Shanghan as a disease, it does not depend on whether essence is stored or not; as long as one encounters the pathogen, illness ensues. This differs from Wenbing and Rebing, where storing essence prevents illness, while failing to store essence guarantees illness. However, those who can store essence, even if occasionally exposed to pathogens, whether warm or summer-heat, will naturally have milder illness; those who cannot store essence, even if slightly exposed to pathogens, whether warm or summer-heat, will inevitably have severe illness. This is a slight difference! If one specifically regards "failure to store essence in winter without any external contraction" as the fundamental disease of Shaoyin (Lesser Yin), believing that heat arises internally, this would contradict Zhang Zhongjing's principles regarding Wenbing. In Zhang Zhongjing's treatise, it is only stated that in the initial stage of Taiyang (Greater Yang) disease, characterized by fever, thirst, and aversion to cold absent, it is called Wenbing. This distinguishes it from Shanghan; it does not imply that cold invading the Taiyang channel does not enter from the exterior, but rather that heat arising internally from Shaoyin constitutes the pathology. The classics further state: "In Wind-Wen disease, the pulse is floating at both the Yin and Yang positions." This clearly indicates that the onset of Wenbing is triggered by contracting spring wind, which stirs up internal heat, causing the Yin and Yang pulses to both float. Generally, the discussions on Wenbing, Fengwen (Wind-Warmth), and Rebing mutually elucidate their meanings. Since the discussion on Rebing is already clear in the classics, establishing another discussion might seem redundant; this is not because Zhang Zhongjing detailed Shanghan but neglected Warmth syndromes. Now, combining Fugqi (Latent Qi), Wenbing, and Fengwen into one chapter, the treatment methods for Warmth and Heat diseases follow the Six Channels (Liu Jing). Readers should carefully study the *Suwen: Rebing Lun* (Plain Questions: Discussion on Heat Diseases), as well as the *Cire* (Puncturing Heat) and *Pingre* (Evaluating Heat) chapters, and cross-reference them with this discussion to gain understanding.

The Master said: "Fugqi disease should be anticipated through careful observation: within this month, there may be latent Qi. If one previously had latent Qi, one must examine the pulse. If the pulse is weak and faint, there should be throat pain, resembling an injury, but it is not Houbi (acute sore throat/swelling). The patient says: 'Indeed, there is pain in the throat.' Even so, now there is a desire for diarrhea."

[Annotation] The normal climate of the four seasons is Zhengqi (Upright Qi); non-seasonal climate is Xieqi (Pathogenic Qi). Zhengqi injuring people is shallow; severe exposure leads to immediate illness, while mild exposure lingers in the skin and muscles without immediate illness, and robust individuals may recover spontaneously. Xieqi injuring people is deep; even mild exposure leads to immediate illness, and severe cases directly invade the Zang organs, unable to recover spontaneously. Weak patients may die. The Fugqi disease mentioned in this chapter refers to the normal illness caused by the four seasons' upright climate, not the abnormal pathogens of the four seasons or the epidemic pathogens of unusual qi. Regarding Fugqi, for example, contracting winter wind-cold: severe cases injure Ying (Nutrient) and Wei (Defensive) levels and manifest immediately, named Zhongfeng (Wind Strike) or Shanghan; mild cases lie latent in the skin and muscles and manifest later, named Wenbing. Thus, illnesses caused by Shiqi (Seasonal Qi) and Fugqi must be distinguished. The three months of spring are named "Fa Chen" (Sprouting and Growing), the month when Fugqi is about to emerge. If a person with existing Fugqi falls ill taking advantage of the gap of failing to store essence in winter, one must identify it via pulse diagnosis. Within this month, for those newly contracting Shanghan or Wenbing, if the pulse is weak and faint, it is the Shaoyin pulse. If there is throat pain, it is a Shaoyin syndrome. However, the pain must be gradual, unlike the sudden, violent pain of Houbi swelling and injury caused by external seasonal pathogens. Since it is described as substantial throat pain, yet the pulse is weak and faint, we know this is Yin fire emerging internally from Shaoyin Fugqi. Although there is throat pain, there may be subsequent diarrhea; thus, it should not be treated as Houbi caused by external Yang fire of seasonal pathogens.

[Collected Annotations] Zhang Xiju stated: This clause discusses Fugqi disease, which emerges from within, unlike epidemic acute diseases that arrive from outside.

Taiyang disease, characterized by fever, thirst, and absence of aversion to cold, is Wenbing. After sweating therapy, if the body becomes burning hot, it is named Fengwen. In Fengwen disease, the pulse is floating at both Yin and Yang positions; there is spontaneous sweating, heaviness of the body, excessive sleepiness, snoring breath, and difficulty speaking. If purgation is applied, there will be difficulty urinating, fixed gaze, and incontinence of urine and feces;
If moxibustion/fire therapy is applied, mild cases result in yellowing of the skin, severe cases resemble epilepsy with convulsions; if scorched by fire, one error may prolong the disease, but two errors will hasten death.

[Annotation] Fever without thirst and with aversion to cold is a Taiyang syndrome. Fever with thirst and without aversion to cold is a Yangming syndrome. Now, in Taiyang disease at its onset, without waiting for cold pathogen to transform into heat and transfer to Yangming, the immediate appearance of fever, thirst, and absence of aversion to cold indicates this is not Taiyang Shanghan, but Taiyang Wenbing. This is due to those indulging in rich foods failing to store essence in winter, or laborers injuring themselves with cold in winter; internal Yin is already deficient, external Yang is constrained, and the meridians throughout the body have already undergone warming transformation. Thus, upon encountering external pathogens in spring, they respond from within. Those contracting cold pathogens have no sweat, named Wenbing; they should be treated with He Jian's method using Shuijie San (Water Dissolving Powder), analyzing the exterior and interior to resolve it. Shuijie San is a combination of Tianshui Liuyisan (Heavenly Water Six-One Powder) and Fangfeng Tongsheng San (Wind-Protecting Unblocking Hero Powder). Those contracting wind pathogens have sweat, named Fengwen; they should use Shuijie San minus Mahuang (Ephedrae Herba), plus Guizhi (Cinnamomi Ramulus), doubled Baishi (Gypsum Fibrosum), to induce slight sweating for harmonization. If heavy sweating is induced, it will exacerbate accumulated heat, leading to body heat like burning fire. Fengwen disease involves wind pathogen excess on the exterior, hence the six pulses of Yin and Yang are all floating. Heat pathogen stagnating internally in the chest causes excessive sleepiness and snoring. Wind pathogen damaging Wei level leads to insecure exterior Qi and spontaneous sweating; intense heat damaging Qi causes heaviness, fatigue, low voice, and difficulty speaking. If purgation is applied, Yin fluids are further depleted, leading to exhaustion of water sources and difficulty urinating. The bladder Qi of Taiyang is nearing extinction, causing fixed gaze. The Kidney Qi of Shaoyin is insecure, causing incontinence. If fire therapy is applied, adding fire to fire causes Yang Qi to scorch, leading to jaundice, hence mild yellowing; severe cases involve extreme heat generating wind, resembling epilepsy with convulsions. Mild yellowing, with deepening color turning black, resembles fire-scorching. Wenbing and Rebing without aversion to cold indicate exterior heat; thirst with desire to drink indicates interior heat. Exterior heat without cold makes sweating inappropriate; interior heat without excess makes purgation inappropriate. Exterior and interior heat together make fire therapy especially inappropriate. "One error" refers to sweating, purgation, or fire; "two errors" refer to sweating followed by purgation, or purgation followed by fire. One error depletes Yin, allowing time to pass; two errors cause immediate Yin collapse, hence "hastening death." Shanghan is injury by the proper cold of winter. Wenbing and Rebing are injury by violent cold of the other three seasons. Non-seasonal violent cold is abnormal Qi; because it combines with the ruling Qi to cause disease, spring combines with wind-warmth, named Fengwen; summer combines with summer-heat, named Shure. People generally call it Shanghan or Shiqi. Physicians see its transmission through the Six Channels and identical exterior-interior conditions, so they treat it similarly. For Wenbing and Rebing without sweat, Da Qinglong Tang (Major Green Dragon Decoction) is suitable; for intermittent sweat, Guizhi Er Yuebi Yi Tang (Guizhi Two Parts, Yuebi One Part Decoction) is suitable; for those with sweat, Guizhi combined with Baihu Tang (White Tiger Decoction) is suitable. For interior heat, Fangfeng Tongsheng San is used; for exterior excess, double Mahuang; for interior excess, double Dahuang (Rhei Radix et Rhizoma). Resolve based on disease severity and dosage. Before three days, recovery is assured. For those with heavy external pathogens and early internal Yin injury, unresponsive to sweating and purgation, analyze exterior and interior, and treat according to transmitted syndromes. This method is effective year-round in Western and Northern regions. In warmer Jianghuai regions, it is applicable only in early winter and early spring. In late spring and early autumn, even if pulse and symptoms match, when using Mahuang, Guizhi, Qinglong decoctions, doses must be reduced, adjusted to symptoms, stopped when appropriate, never exceeded, as excess leads to adverse changes. This is what the classics mean by "same disease, different treatments."

[Collected Annotations] Cheng Zhi stated: Wenbing heat emerges from within, hence fever, thirst, and no aversion to cold. Fengwen involves internal and external heat combined with spontaneous sweating, leading to symptoms like heaviness and sleepiness, with variations in severity and prognosis. Physicians should distinguish primarily by presence or absence of sweat, and decide treatment based on whether sweating is indicated. He also stated: Zhang Zhongjing's Qinglong and Baihu formulas are divine! Understanding this principle allows infinite application. Generally, Wenbing requires dispersing with heavy cooling, while Fengwen should not have heavy dispersing added to cooling.
Cheng Yingmao stated: On the first day of Taiyang disease, presenting with fever, thirst, and no aversion to cold, it is because pathogens have long been stored internally; the external contraction in Taiyang is merely the starting point. The internally stored heat was not formed overnight. Since failing to store essence in winter and contracting cold, Kidney Yin was already deficient. Upon the movement of Spring Yang, even before illness manifests, the meridians are filled with Qi of Yang excess and Yin deficiency. The statement that Wenbing emerges in spring implies it originates from the embryonic stage.