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Taiyang Zhongre (Heatstroke in the Taiyang Channel), also known as "Ye" (Heatstroke), manifests with sweating, aversion to cold, body fever, and thirst.

The term "Ye" refers to the pathogenic factor of summer-heat invading the human body during the height of summer. There are three clauses regarding the Ye syndrome, distinguishing between primary syndromes and transformed syndromes. This illustrates that diseases do not have fixed patterns and symptoms vary, urging physicians to establish treatment principles based on specific manifestations rather than adhering to a rigid, unchanging method. This clause first describes the primary syndrome and uses the phrase "Zhongre" (being struck by heat) to explain the meaning of "Ye," which corresponds to "Bing Shu" (disease of summer-heat) mentioned in the *Neijing: Re Lun* (Treatise on Heat). Wang Kentang stated: "Zhongye, Zhongshu, and Zhongre differ in name but are essentially the same disease." It is called "Ye" because during the time when summer-heat is dominant, the qi becomes pathogenic due to the summer-heat; it does not refer to the righteous qi of the summer season itself. The cold pathogen of winter, when contracted, causes Shanghan (Cold Damage); however, non-seasonal cold exists in all four seasons, and contracting it also results in Shanghan. The wind pathogen of spring, when contracted, causes Fengzhong (Wind Strike); similarly, non-seasonal wind exists in all seasons, and contracting it results in Fengzhong. At the end of spring and beginning of summer, if wind pathogens persist and warm-heat begins to circulate, contracting them causes Fengwen (Wind-Warmth). Before the Summer Solstice in summer, when heat is not yet extreme and the climate remains mild, contracting such pathogens causes Wenbing (Warm Disease), as described in the *Suwen*: "Diseases occurring before the Summer Solstice are Warm Diseases." Nevertheless, non-seasonal warmth occurs in all seasons, leading to diseases like Chunwen (Spring Warmth) and Dongwen (Winter Warmth). Even during the crisp autumn air, contracting non-seasonal warmth can result in Qiuwen (Autumn Warmth). Only the "Ye" syndrome occurs exclusively during peak summer heat and is absent in other seasons. Generally, pathogenic factors roaming between heaven and earth in the four seasons are aberrant qi resulting from excess or deficiency in the ascent and descent of yin and yang, and climatic changes. These factors utilize the seasonal qi of cold, heat, warmth, and coolness to invade humans, causing diseases of wind, cold, warmth, and summer-heat, but they only invade when the human body is deficient. Thus, the *Lingshu* states: "Wind, rain, cold, and heat cannot injure people alone unless they encounter empty pathogens; they must combine with the dual deficiency of the pathogen and the body's constitution to invade the form." Therefore, the "Ye" syndrome is not caused by the summer heat itself, but by the pathogenic qi of summer-heat invading the body, corresponding to "Bing Shu" (disease of summer-heat) after the Summer Solstice as stated in the *Re Lun*. This pathogenic qi enters through the Ying and Wei (Nutritive and Defensive levels), similar to wind and cold, hence it is associated with the Taiyang channel. However, compared to Fengzhong (Wind Strike), although both present with fever, sweating, and aversion to cold, Ye presents additionally with thirst. The reason for thirst in Ye differs from Shanghan: in Shanghan, which originates as cold, thirst arises only after the cold transforms into heat and enters the interior, drying the stomach; in contrast, Ye is caused by summer-heat, which is inherently hot, so thirst appears immediately upon invasion without needing to enter the interior. In Yangming syndrome, although there is fever and sweating, there is aversion to heat rather than cold. If the pathogen enters the interior of Yangming causing thirst for water, aversion to cold would be absent. This distinguishes Fengzhong from Ye, and Taiyang from Yangming. Wenbing also presents with fever and thirst, but the absence of aversion to cold defines it as Wenbing. Ye presents with fever, thirst, and aversion to cold, distinguishing it from Wenbing. Both Wenbing and Ye are caused by summer-heat pathogens in summer. Ye presents with aversion to cold, while Wenbing does not, because Wenbing occurs before the Summer Solstice during the pure yang season; its warm-heat pathogen spreads on the skin and fills the muscles, gradually entering the interior, causing heat in both exterior and interior, thus no aversion to cold. Ye occurs after the Summer Solstice, when yang reaches its peak and yin begins to grow. During this time, heavy sweating opens the pores, leaving the Wei yang sparse and the exterior qi deficient, unable to resist external pathogens, resulting in sweating and aversion to cold. In previous Taiyang Fengzhong, sweating and aversion to wind indicated unresolved exterior pathogens, treated with Guizhi Tang (Cinnamon Twig Decoction) to induce sweating. In Taiyang-Yangming Fengzhong with stiffness of the neck and back, sweating, and aversion to wind, the exterior Taiyang syndrome was unresolved, treated with Guizhi Jia Gegen Tang (Cinnamon Twig Decoction plus Pueraria Root Decoction). When heat pathogens enter the stomach, causing thirst, dry mouth and tongue, or severe restlessness and unquenchable thirst with a surging pulse after profuse sweating, Baihu Jia Renshen Tang (White Tiger Plus Ginseng Decoction) is indicated. Although this clause does not specify a treatment, the *Jingui Yaolue* applies Baihu Jenshen Tang to the fever and aversion to cold presented here, seemingly indicating an unresolved exterior. Why? Wind, though a yang pathogen, is less intense than warm-heat or summer-heat; thus, despite fever and sweating, sweating therapy is appropriate. Summer-heat is pure yang qi and inherently hot. Given the profuse sweating in midsummer, although the *Re Lun* states "summer-heat should exit with sweat and not be suppressed," the *Nue Lun* notes that sweating leaves pores open, allowing summer-heat to invade. This indicates the summer-heat pathogen exploits the deficiency of the pores to cause Ye. Therefore, Shigao (Gypsum Fibrosum) is used to clear seasonal summer-heat, and Renshen (Ginseng Radix et Rhizoma) is added to tonify the exterior deficiency caused by sweating and generate fluids to treat dryness and thirst. Although this clause omits the pulse, subsequent mentions of weak, fine, hollow, and slow pulses indicate deficiency. A large pulse with summer-heat or a floating pulse with sweating and aversion to cold would suggest excess; their absence confirms deficiency. Fever with a deficient pulse indicates the indication for Ren Shen Bai Hu Tang (Ginseng White Tiger Decoction). Hence, "deficient pulse and body heat result from summer-heat injury." Laypeople misunderstand Zhang Zhongjing's legislative intent: he originally used Guizhi Tang for Fengzhong, Mahuang Tang (Ephedra Decoction) for Shanghan, Qinglong Tang (Green Dragon Decoction) for warmth, and Baihu Tang (White Tiger Decoction) for summer-heat, establishing four main pillars, then observing transformations and adapting treatments accordingly, utilizing cold, heat, warmth, coolness, tonification, and purgation as needed, rather than rigidly adhering to formulas like Dashun San (Great Perfection Powder), Cangzhu Baizhu Tang (Atractylodes Macrocephala and White Tiger Decoction), or Xiangru Yin (Elsholtzia Decoction).

[Correction of Errors]
Discussions on summer-heat diseases have been numerous and confusing. Liu Wansu reported that Zhang Congzheng (Jiegu) distinguished static acquisition as Zhongshu (Heatstroke) and dynamic acquisition as Zhongre (Heatstroke), while Li Dongyuan distinguished resting in deep halls as Zhongshu, treated with Dashun San, and labor-induced cases as Zhongre, treated with Cangzhu Baizhu Tang. However, summer-heat is a single entity, the qi of summer. Illness from resting in halls is actually cold injury in summer, not distinct from Zhongre. Danxi argued that in summer, yang qi floats to the surface, leaving the abdomen deficient ("hidden yin" implies deficiency, not cold). Predecessors used warming medicines like Dashun San for summer-heat, but this was for injuries from cold environments (pavilions, ice), not for "hidden yin." In the fire season, with temperatures melting stone and flowing metal, where is the cold? Sun Simiao recommended Shengmai San (Generate Pulse Powder) in summer due to deficiency. I argue that according to the *Re Lun*, diseases after the Summer Solstice are summer-heat. From post-Solstice to pre-Autumn Equinox, during intense heat, any contraction of summer-heat pathogenic qi is heat pathology, i.e., Ye. Summer-heat and heat are synonymous; *Neijing* calls it Bing Shu, Zhongjing calls it Taiyang Zhongre, named Ye. Since summer-heat and heat are one, static vs. dynamic distinction is invalid. Li Dongyuan's distinction of environment vs. labor is merely static vs. dynamic. Using names like Zhongshu/Zhongre to categorize under different formulas is erroneous. Danxi's interpretation of "yin" as "deficiency" is incomplete; if "hidden yin" meant true cold, it would contradict the intense heat of summer. Sun Simiao's use of Shengmai San was preventive, using Renshen and Wuweizi to retain fluids lost through excessive sweating, and Renshen and Maidong to protect metal (lungs) from fire, not as a general cure for those already suffering from summer-heat. Otherwise, the *Suwen* instruction "summer-heat should exit with sweat" would be ignored. Thus, not all summer illnesses are summer-heat. Dashun San treats cold from drinking cold liquids; Ren Shen Bai Hu Tang treats summer-heat attacking deficiency; Wuling San warms the lower jiao and promotes urination; Yiyuan San clears summer-heat and promotes urination; Xiangru Yin disperses, harmonizes, and drains dampness. Treatments must match the syndrome. If in summer, headache, aversion to cold, fever, and absence of sweating occur, it is cold pathogen mixed with summer-heat, treated as Shanghan with Ma Huang Tang. If combined with warm-heat, Da Qing Long Tang is indicated. Differentiate wind, cold, summer-heat, and dampness, and apply Zhongjing's methods. Do not change methods based solely on weather. Heaven and earth have correct qi of cold, heat, warmth, and coolness governing seasons. Non-seasonal warmth causes Chunwen/Dongwen; non-seasonal cold causes Shanghan in all seasons. As stated in *Yueling*, improper seasonal movements cause epidemics. One cannot treat solely based on correct seasonal qi. Illness arises from deviation; treat the deviant pathogen. Is it reasonable to stubbornly claim cooling herbs are forbidden in winter and diaphoretics forbidden in summer? This is a vulgar error. Wang Lv in *Suhui Ji* agreed that Zhongshu and Zhongre are one syndrome. He stated that laborers with deficient yuan qi cannot resist extreme heavenly heat, leading to invasion; those avoiding heat in halls suffer from cold obstructing yang, resembling Shanghan, treatable with acrid-warm dispersants. Dashun San, rich in Gancao (Licorice Root), ginger, cinnamon, and apricot kernel, was originally for spleen-dampness from overdrinking due to hidden heat, causing vomiting and indigestion. Using it for static cases may fail to disperse and increase internal irritability. Laypeople mistakenly believe "yin inside" means cold, necessitating warming drugs. Summer "yin" refers to relative interior state, not cold. Cangzhu Baizhu Tang is occasionally suitable but not universal. Treatments must follow observed syndromes. Wang's distinction clarifies Shanghan vs. summer-heat, proving predecessors' errors. However, later summer-heat formulas are not flexible enough; Zhongjing's methods, though lacking specific formulas, offer diagnostic principles (contraindications for sweating/purging) that allow adaptation. Formulas were omitted to encourage flexibility, unlike rigid later formulas.

Taiyang Ye, characterized by fever, heaviness, pain, and a weak pulse, results from injuring cold water in summer, causing water to remain in the skin.

Fever indicates a Taiyang exterior syndrome. The absence of mention of sweating and aversion to cold suggests a milder pathogen than in the previous clause. "Heaviness and pain" refers to bodily heaviness and pain. Shanghan presents with body ache, waist pain, and joint pain; Shi Jia (Dampness patients) present with bone/joint discomfort and generalized pain. Here, the yang pathogen of summer-heat presents with cold-damp symptoms, indicating injury from cold water in summer, with water lingering in the skin. Injury from cold water includes drinking cold water or washing with it; cold water lingers and penetrates the skin. The pulse in summer-heat is naturally deficient; combined with cold-water injury, it becomes particularly weak. The Taiyang channel is invaded by summer-heat, entering via Ying and Wei, causing exterior fever. Previous symptoms included aversion to cold, sweating, and thirst; this clause lacks sweating and thirst but has body heaviness and pain because, in addition to summer-heat, cold water has entered the skin, preventing sweating and thirst. The pulse is weak due to summer-heat deficiency and cold-damp injury. Although the text lacks a treatment, the *Jingui Yaolue* prescribes Yi Wu Gua Di Tang (Single Melon Citron Decoction). Wang Kentang suggested Yi Wu Gua Di San or Wuling San. Reasoning logically: if summer-heat is severe with strong exterior symptoms, Yi Wu Gua Di Tang's bitter-cold properties can induce vomiting and purging, expelling water and exterior pathogens, as vomiting induces sweating (dispersing action). If fever is mild, exterior symptoms few, but pulse is weak and heaviness/pain prominent with water in the skin, cold-water dominance prevails; Wuling San is appropriate to assist lower jiao steaming qi, directing upper jiao lung qi downward to regulate water passages and excrete via bladder qi transformation. Clinical application requires appropriateness.

Taiyang Ye, presenting with fever, aversion to cold, body heaviness, pain, and a string-tight, fine, hollow, or slow pulse. After urination, the patient feels chilly with goosebumps; hands and feet are cold. Slight exertion causes immediate fever; opening the mouth reveals dry front teeth. Sweating exacerbates aversion to cold; moxibustion exacerbates fever; repeated purgation worsens strangury.

The first clause explained "Ye" as Zhongre, describing sweating, aversion to wind, fever, and thirst as the primary syndrome. The second clause described milder summer-heat without aversion to cold/sweating, identified as cold-water injury due to lack of thirst, heaviness, pain, and weak pulse. This clause represents a complex Ye syndrome. It presents with fever, aversion to cold, heaviness, pain, but no sweating or thirst, ruling out pure yang-pathogen dominance. It is not cold-water injury either. String-tight, fine, hollow, and slow pulses are yin pulses: string-tight indicates yin pathogen tension, fine indicates qi deficiency, hollow indicates emptiness, slow indicates cold. While summer-heat pulse is deficient, it is rarely this severe, indicating a yin-cold syndrome. Chills and goosebumps after urination indicate difficult urination and deficient Wei yang, reflecting lack of fire in the lower jiao and sluggish qi transformation. Hands and feet are cold because limbs are the root of yang, and yang deficiency prevents qi reaching them. All these are yin-cold signs. Slight exertion causing fever disturbs yang, activating latent summer-heat. Dry front teeth despite cold limbs result from slight exertion stirring yang, causing fever and fluid dryness. Cheng Wuji cited *Shengqi Tongtian Lun*: "Summer-heat sweating leads to panting when annoyed; panting opens the mouth and dries front teeth." Sweating depletes Wei yang, increasing exterior cold (worsening aversion to cold). Moxibustion adds fire, aggravating summer-heat (worsening fever). Purging damages true yang, chilling the lower jiao, stopping qi transformation, and worsening strangury. This clause lists pulses and symptoms without explaining mechanisms or providing treatment, only warning against fire therapy, sweating, and purging. Ancient legislation was profound, encouraging later scholars to deduce principles. "If you can explore my collected works, you will understand more than half." I reason that Wuling San should be used to assist lower jiao qi transformation, restoring fluids, facilitating urination, strengthening Wei qi, and resolving pathogens. If yang recovers but summer-heat persists with fever and thirst, Ren Shen Bai Hu Tang may be considered.