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Yu Chang said: Wind and dampness are two pathogenic factors that have no fixed form and change with the seasons. Dampness manifests as cold-dampness in winter, wind-dampness in spring, heat-dampness in summer, and dry-dampness in autumn, because the qi of damp-earth is dominant at the end of each season, and its nature changes along with the four seasons. I have already discussed this; wind is the same. Wind is biting cold wind in winter, warm and smooth wind in spring, hot southern wind in summer, and desolate cool wind in autumn. The *Huangdi Neijing* (Yellow Emperor's Inner Canon) states that wind is the chief of a hundred diseases, referring to its unpredictable changes. When invading the human body, wind usually affects the upper part first, while dampness affects the lower part first; both enter through the Foot-Taiyang Bladder Meridian. Wind damages the Wei-Qi (Defensive Qi), and dampness flows into the joints; wind pathogen is yang and tends upward, damp pathogen is yin and tends downward; wind pathogen is formless and resides externally, damp pathogen has form and resides internally; between the upper and lower, inside and outside, the pathogens fight each other, thus manifesting symptoms such as sweating, aversion to wind, shortness of breath, fever, headache, severe pain in bone joints, heaviness of the body, and slight swelling. This condition should indeed be resolved through sweating, but the method differs from the usual approach. When using Mahuang Decoction (Mahuang Tang), Baizhu must be added, or Yiyiren can be added to remove dampness. When using Guizhi Tang, Shaoyao must be removed and Baizhu added; in severe cases, Fuzi should be added to warm the meridians. Inducing sweat should be done slowly rather than rapidly; if rapid, wind will leave but dampness will remain; if slow, both wind and dampness will be expelled. For those who cannot undergo sweating therapy, it is because wind-dampness intermingling often involves Yang deficiency; when Yang is deficient, sweating is contraindicated, and one should only use pungent-hot herbs to strengthen Yang and expel dampness. Whenever shortness of breath is seen, although it is due to pathogen obstructing Zheng-Qi (Upright Qi), one should consider deficiency of Yang in the chest. Whenever sweating accompanied by slight panting is seen, although it is due to Lung Qi being affected by pathogen, one should consider the impending collapse of True Yang; an astute physician will identify this early. In the *Shanghan Lun* (Treatise on Cold Damage), the case of wind-dampness intermingling uses winter cold to analogize the other three seasons. In the "Jing Shi Yue" chapter of the *Jingui Yaolue*, the case of wind-dampness intermingling uses summer heat to analogize the other three seasons. It says: "The patient suffers from whole-body pain, fever, which worsens at dusk (Ribu), named Wind-Damp." This disease is caused by sweating while exposed to wind, or long-term exposure to cold. Is it not because in summer, exposing oneself to wind and staying in the cold too long closes the sweat pores? Worsening at dusk indicates the disease is in the Yangming channel. However, this is different from the Jing disease where teeth are clenched, heat is deep and severe, and Yangming purgation is indicated; this condition can only be treated with sweating, not purgation. Why? The *Neijing* states that Taiyin and Yangming are exterior-interior pairs, externally combining with muscles; thus, Yang channels receive wind, and Yin channels receive dampness. Therefore, when wind-dampness attacks Taiyin and Yangming, it is in a semi-exterior semi-interior state. Whole-body muscle pain indicates that exterior pathogens remain, so sweating is permissible but purgation is not. Moreover, the Qi of the human body circulates in the Yang aspect twenty-five times during the day: at dawn it belongs to Shaoyang, at noon to Taiyang, and at sunset to Yangming. Worsening at dusk means the pathogen is in Yangming, but the Qi of Taiyang and Shaoyang has not yet fully receded, so sweating is permissible but purgation is not. Looking at the *Jingui Yaolue*, one passage says: "Mahuang Jia Zhu Tang may be given; inducing sweat is appropriate, strictly avoid fire therapy." Another passage says: "Mahuang Xingren Yiyi Gancao Decoction may be given." Although it does not explicitly say purgation is forbidden, the meaning that sweating is allowed but purgation is not is evident by analogy. If purgation is used, Stomach Qi will be weakened, wind pathogen will sink inward, and damp pathogen will surge upward, leading to untold complications. Regarding pain from dampness flowing into joints with a sinking-thin pulse, this is not due to external wind fighting with it, but is called Shibi (Dampness Bi Syndrome). Shibi refers to dampness blocking the Yang Qi within the body. Promoting urination allows Yang Qi to flow freely, resolving the joint blockage. If urination becomes normal but joint blockage persists, it must be that Yang Qi is held by dampness and cannot vent outward, or perhaps only the head sweats while the body does not, and the patient desires covering and warmth near fire; in this case, mild sweating should be induced to unblock Yang. Due to the varied and confusing texts on "wind-dampness intermingling," which are hard to reconcile, I discuss them together.

Zhongshu (Heatstroke) is a term known since the *Zuo Zhuan*, which records resting under tree shade. Later generations distinguished between "Zhongre" (Heatstroke from activity) and "Zhongshu" (Heatstroke from rest). Can people walking on roads be considered resting? The terms "activity" and "rest" only distinguish between external contraction and internal injury. Activity-induced illness is external contraction of solar heat. Rest-induced illness occurs when avoiding solar heat leads to exposure to yin-dampness, wind-dew, melons, and raw/cold foods. Seasonal Minor Cold and Major Cold cause Shanghan (Cold Damage). Seasonal Minor Heat and Major Heat cause Shangshu (Summerheat Injury). Laborers exposed to cold and heat often suffer from cold/heat diseases. Those living in comfort do not contract these unless invited by improper diet or sexual excess. Thus, treatments differ for the rich and poor, and across regions.

People with abundant internal dampness are most prone to Zhongshu due to mutual resonance. External summer heat steams internal dampness, allowing the two to interact, causing Zhongshu. Hence, obese people have much dampness; despite trying to avoid summer heat, they still get struck because they cannot avoid their own dampness, and thus cannot avoid heavenly summer heat. Yiyuan San expels dampness via urine and is effective for summer heat relief. However, it suits those with robust constitutions and high dampness. For those with fluid depletion but no dampness, Shengmai San should be used to replenish fluids. Using Yiyuan San would recklessly promote urination, exhausting the lower source and causing immediate withering. Furthermore, summer heat steaming dampness often accompanies internal deficiency-cold in obese people, leading to Huoluan (Cholera-like syndrome) with vomiting, diarrhea, cold sweat, and cold limbs, endangering life. Relying solely on Yiyuan San to resolve heat and dampness often accelerates organ failure. Moreover, for those with profuse sweating, promoting urination is contraindicated. Since Stomach fluids are limited, losing them externally and then internally is a recipe for death. Zhang Zhongjing calls this "Yanglessness"; if the pulse is short, rapid, knotted, or intermittent, death is imminent.

Sudden collapse with loss of consciousness in Zhongshu is called Shufeng (Summerheat Wind). It generally has excess and deficiency types. Excess is phlegm-excess: chronic phlegm accumulation in collaterals, suddenly triggered by intense summer heat, blocking Qi, causing sudden collapse and salivation. This is the most severe form of damp-summerheat combined disease. Phlegm should be vomited out first, then summerheat cleared. Deficiency is Yang-deficiency: chronic Yang weakness and Yin-cold dominance, suddenly triggered by intense summer heat, allowing pathogen to exploit deficiency. This is damp-summerheat disease originating from deficiency-cold. Yang-restoring herbs combined with summerheat-clearing herbs are needed, making it difficult to treat. Zhu Danxi argued that in fire seasons, metals melt and stones crack, so how can there be Yin-cold? His view was biased, leading to errors. Snow on Mount Emei never melts; does this mean all temples in summer are fires? Internal accumulated Yin can be so cold that soup and fire cannot warm it. The *Neijing* says "seek what is absent, blame what is deficient," implying we must address deficiency, not just excess. My view holds that Dahuang Long Wan has cured sudden Zhongshu coma upon administration. Occasionally, Qi Jue (Qi Collapse) from emotional injury causes collapse without phlegm; Suhe Xiang Wan is indicated. Xu Xueshi stated this is sudden Qi reversal, resolving spontaneously, but clearing summerheat after recovery is necessary.

In summer, Yang Qi escapes via sweat, and Yin fluids deplete via heat. Both Yin and Yang are insufficient. Zhang Zhongjing forbids sweating, purging, and moxibustion for Zhongshu: sweating injures Yang, purging injures Yin, and moxibustion draws fire inward. Treatment relies on sweet-cold herbs to generate fluids, protect the Lung, secure Yang, and benefit Yin. This is crucial. The *Lingshu* states: "If Yin and Yang are both deficient, tonifying Yang exhausts Yin, draining Yin destroys Yang." Yang resides in Yin, so tonifying Yang must not injure Yin. Yin roots in Yang, so draining Yin must not disturb Yang. With both deficient, tonification and drainage are risky, easily causing imbalance. Overusing sweet-warm risks tonifying Yang excessively; overusing bitter-cold risks draining Yin excessively. Using one sweet and one cold herb balances Yin and Yang, clearing summerheat gently, becoming the model for generations.

Regarding the *Jingui Yaolue*'s treatment of Zhongshu using Baihu Jia Renshen Tang and Gua Di Tang: The text offers only these two formulas. Baihu Jia Renshen Tang specifically treats heat. Summer heat rebels upward, damaging Lung Metal and consuming fluids; this formula saves Lung Metal and preserves fluids. Sun Simiao's Shengmai San and Li Dongyuan's Qingshu Yiqi Tang derive from this. Gua Di Tang specifically treats dampness. Summer dampness rising transforms into heat, also damaging Lung Metal first, causing water to accumulate in the skin. Skin is the exterior of the Lung; this formula extracts water from the chest, inducing vomiting or diarrhea, unblocking Lung Qi, and directing skin water downward. Later physicians only followed Zhang Zhongjing's Wuling San. Liu Wansu's Tongling San and Zhang Zihé's Guiling Ganlu Yin guide dampness and relieve heat but lack the derivation from Gua Di Tang to clear Upper Jiao damp-heat and soothe Lung Metal. Thus, I highlight these two: for formless heat damaging Lung Metal, use Baihu Jia Renshen Tang; for formed dampness damaging Lung Metal, use Gua Di Tang. These are not in the *Shanghan Lun* but reappear in the *Jingui Yaolue*, a subtle technique to be recognized.

Baihu Jia Renshen Tang: The text says: "Taiyang Zhongre is Zhongshu. Patient has sweating, aversion to cold, body heat, and thirst; Baihu Jia Renshen Tang governs." Sweating with aversion to cold in summer indicates Wei-Qi deficiency. Body heat and thirst indicate Lung Metal oppressed by Fire, causing dryness and thirst. The *Neijing* says: "Heart transfers heat to Lung, transmitting as Ge Xiao (Diabetes); Xiao implies thirst." Heart Fire is strong, oppressing Lung Metal. Though presenting as Taiyang, it differs from winter cold damage. This formula saves Lung Metal, the primary principle.

Gua Di Tang: The text says: "Taiyang Zhongshu, body pain and heaviness with weak pulse, caused by summer cold water injuring the skin; Yi Wu Gua Di Tang governs." Changing powder to decoction, removing Chixiaodou and Suanjiangshui, using only Gua Di. Extracting chest water allows skin water to exit. Extraction implies venting; normal sweating resumes, no water remains in skin. This aligns with the *Neijing* case where pouring water on sweat stops sweating. Zhang Zhongjing understood this, noting Zhongshu includes Zhongshi. Why is the pulse weak? Zhongshu pulse is inherently weak; dampness in skin combines with Lung, hindering Ying-Wei circulation, making the pulse weaker. Summer pulse is weak on pressure; damp pulse is weak on light touch; combined, it is weak on both. Extracting water restores Ying-Wei and Lung Qi; smooth pulse indicates damp removal; strong pressure indicates summerheat resolution. One herb achieves such swift results.

Water in skin comes from accidental summer cold exposure, excessive cold drink, or cold water on sweat, blocking outgoing Yang, causing heat and pain. Gua Di expels water, restoring Yang. Chronic cold/drink injures Lung gradually; this acute injury only affects skin-Lung connection, resolved quickly without Chixiaodou or Suanjiangshui. Extending this, long-term cold exposure blocks Upper Jiao Yang, differing from ground dampness entering feet, which requires diuretics. Distinction is vital.

Sudden collapse in summer is Shufeng. Heart Fire surges, summerheat exploits it, causing choking, coma. Other organs may be deficient, allowing deep summerheat invasion, though less severe than Heart involvement. Entering Liver causes dizziness/stiffness; Spleen causes lethargy; Lung causes wheezing/weakness; Kidney causes wasting-thirst. Tonification and clearing must be combined, targeting the specific organ.

Pulse of Shangshu: *Neijing* says: "Weak pulse, body heat, from Shangshu." *Jiayi Jing* says: "Heat injures Qi, not Form, hence weak pulse." *Nan Jing* says: "Floating-large-scattered," which is incorrect; this is the normal Heart pulse, not pathological. Zhang Zhongjing supplements this with "String-Thin-Hollow-Slow." Hollow implies void; String-Thin-Slow reflects heat injuring Qi. Water-in-skin pulse is weak, showing dampness holding Qi. Generally called Weak; specifically String-Thin-Hollow-Slow-Weak. Not mixing Floating-Large with Weak shows thoroughness.

Midday labor with summerheat exposure requires cooling detoxification: Baihu Tang, Yiyuan San, Huanglian Xiangru Yin, Sanhuang Shigao Tang. Living in cool houses, eating raw/cold food, suppressing Yang to cause Zhongshu requires caution. Cooling formulas are not directly applicable. If no sweat, release exterior to vent Yang; if vomiting/diarrhea, harmonize Middle; if severe, use mild warming herbs to guide treatment. Cholera from summerheat exposure focuses on clearing heat; cholera from avoiding heat focuses on harmonizing/warming Middle. Distinction is key.

Yuanfeng era Heji Ju compiled medical formulas, detailing Zhongshu due to widespread observation. Xiaobanxia Fuling Tang treats dampness, not heat. Adding Gancao creates Xiaoshu Wan, correctly naming heat relief as dampness elimination. Xiangru Yin uses Xiangru, BianDou, Houpo. High heat: remove BianDou, add Huanglian to treat Heart Fire. High damp: remove Huanglian, add Fuling, Gancao to treat Spleen Damp. Suopi Yin addresses Spleen heavy from damp, adding Wumei, Sharen, Caoguo to invigorate Spleen and remove damp. Severe cases use Dashun San, Laifu Dan for diarrhea, extending Suopi Yin logic. Pipaye San addresses Stomach turbid from damp, using Xiangru, Pipaye, Dingxiang, Baimaoxiang to calm Stomach. Severe vomiting uses Lengxiang Yin, extending Pipaye San logic. Physicians should adjust for heat, damp, deficiency, cold, depth, and urgency. Later scholars added deficiency-tonifying methods. Liu Wansu's Guiling Ganlu Yin and Wuling Sanshi aim to generate fluids for Stomach deficiency. Zhang Zihé's Guiling Ganlu Yin adds Renshen, Gegen, Gancao, Huoxiang, Muxiang to tonify and clear turbidity. Shiwei Xiangru Yin adds Renshen, Huangqi, Baizhu, Chenpi, Mugua to tonify and clear damp-heat. Li Dongyuan's Qingshu Yiqi Tang and Renshen Huangqi Tang tonify Middle and solidify Wei to clear damp-heat. Obese, deficient people should take these frequently. Zhongshu shows irritability/heat; Li Dongyuan's Qingzao Tang follows Zhuyeshigu Tang logic, prioritizing damp removal. Dryness opposes dampness, yet clearing dryness removes damp, showing Li's insight. Yiyuan San removes damp; adding Chenasha clears heat. Wuling San removes damp; adding Renshen tonifies deficiency; adding Chenasha reducing Guizhi clears heat. Baihu Tang adding Renshen tonifies deficiency; adding Cangzhu overcomes dampness. Combined with Heji Ju formulas, it is complete. However, Shufeng resembles stroke but is not wind-pathology. Baiyi Xuanfang's Dahuang Long Wan cures Zhongshu coma, suggesting utility for Shufeng. But if Yin-blood is deficient and summerheat toxin enters Blood level, this pill could be fatal. Diyü San treats Zhongshu coma with blood-cooling herbs, effectively clearing deep blood-level Shufeng. Later called Pohuo San, aptly named. Heavenly fire melts metal; this "sprinkles fire." Shufeng is Heart Fire scorching Yin-blood; only clearing Heart and cooling Blood can extinguish it. Summarizing these formulas, detailed analysis is provided. (All formulas collected at the end of this section.)