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Taiyang disease (Disease of the Taiyang/Bladder channel), characterized by joint pain accompanied by restlessness, and a pulse that is deep and fine, is named Shi Bi (Dampness Bi-syndrome). Its manifestations include difficulty in urination and loose stools; treatment should focus on promoting diuresis.

Shen Yaofeng states: The "Original Preface" of *Shanghan Lun* (Treatise on Cold Damage) says, "I have compiled it using *Suwen* (Basic Questions) and *Nanjing* (Classic of Difficult Issues)," implying that it should be interpreted through these texts. *Nanjing* mentions five types of cold damage, corresponding to the diseases caused by the five qi—cold, summerheat, dryness, dampness, and wind—in *Suwen*. Therefore, Zhang Zhongjing listed five syndromes together in the Taiyang chapter, analyzing them sequentially. This discussion on Shi Bi corresponds to the Shi Wen (Damp-Heat) syndrome in *Nanjing*. *Suwen* states that dampness is associated with heaven as dampness and earth as soil; dampness is the qi of earth. Thus, dampness is one of the five qi, and Shi Wen is one of the five types of cold damage. Compilers of Shanghan works considered Shi Wen and Feng (Wind) not to be Shanghan, placing them in separate discussions. However, if Feng Wind is also not typical Shanghan, why is it retained at the beginning of the volume? *Nanjing* states: "The pulse of Shi Wen is soggy and weak at the Yang position (Cun/Inch) and small and rapid at the Yin position (Chi/Cubit)." This differs slightly from the pulse described here.

Furthermore, since Shanghan has been differentiated into six channels based on symptoms such as headache and stomach excess, one can identify Wind-Cold by "sweating," Dryness-Heat by "thirst," and Dampness by "difficulty in urination." Through this vertical and horizontal differentiation, pathogenic factors cannot hide. Readers should pay close attention to this practical aspect.

Patients with chronic dampness suffer from generalized body pain, fever, and a sallow complexion resembling smoked yellow (dull yellow).

Ni Chongzhi in *Shanghan Huiyan* (Compilation of Sayings on Cold Damage): This is the general outline for diseases of patients with chronic dampness. Generally, individuals whose constitution is prone to dampness are called "Shijia" (Dampness-prone persons). Their pain differs from Bi-pain; when dampness lodges in joints causing pain, it is called Bi. Here, the whole body hurts, and there is exterior heat, so the Liaoshe school calls it a disease in the meridians. Smoked yellow and orange-yellow both result from damp-heat; the former is bright yellow due to dominant heat, while the latter is dull yellow due to dominant dampness. Yinchen Wuling San (Artemisia Capillaris and Five-Ingredient Poria Decoction) is indicated. Haizang regarded smoked yellow as Yin Huang (Yellow Syndrome due to Cold-Damp). Since dampness dominates, it may subsequently transmit to Cold-Middle, presenting with spontaneous urination.

Wang Shixiong adds: This occurs because only heat was cleared without treating dampness, leading to subsequent transmission to Cold-Middle. Shu Fu Tang (Aconite and Atractylodes Macrocephala Decoction) is indicated.

Shen Yaofeng states: Zhu Danxi said: "It is like making yeast; when damp-heat stagnates for a long time, jaundice develops."

Wang Shixiong adds: Jaundice caused by damp-heat is called Huangdan (Jaundice), which is an acute illness. Therefore, Zhang Zhongjing sets an eighteen-day limit. There are many other causes, including Gudan (Grain Jaundice), Jiudan (Alcohol Jaundice), Nulaodan (Sexual Exhaustion Jaundice), Huanghan (Yellow Sweat), and Yin Huang (Yellow Syndrome due to Cold-Damp) caused by cold sweat, loose stools, and Qi deficiency. There is also Ruohuang (Weak Yellow) characterized by facial and bodily edema, white sclerae, ability to eat, but fatigue upon exertion. Jinghuang (Fright Jaundice) results from insufficient spirit and sudden fright causing Gallbladder Qi to leak outward. Weihuang (Withered Yellow) arises from Liver Wood overacting, damaging Spleen and Stomach, leading to Earth failure and color protruding outward. All these differ from acute illnesses and cannot be broadly categorized as damp-heat diseases.

Patients with chronic dampness may experience sweating only on the head, stiffness in the back, and a desire to cover themselves and face fire for warmth. If purgatives are used prematurely, hiccups, chest fullness, difficulty in urination, and a tongue coating resembling moss may occur. This is due to heat in the Dantian (Lower Jiao) and cold in the chest (Upper/Middle Jiao), thirst for water but inability to drink, resulting in dry mouth and irritability.

You Zaijing states: When cold-damp resides in the exterior, Yang Qi cannot circulate outward but floats upward, causing head sweating, back stiffness, and a desire to cover up and face fire. Warm herbs should be used to unblock Yang Qi; attacking methods should not be used to expel dampness. If purgatives are mistakenly used, Yang Qi is further suppressed, leading to hiccups. Alternatively, if Upper Jiao Yang Qi does not distribute, chest fullness occurs; if Lower Jiao Yang Qi fails to transform, difficulty in urination occurs. Symptoms arise according to the site of injury. The moss-like substance on the tongue is not due to Stomach Heat but rather the drying and accumulation of fluids on the tongue surface, mimicking a coating. After purgation, Yang Qi sinks to the lower part while cold-damp remains gathered above. Thus, there is heat in the Dantian causing thirst, and cold in the chest preventing drinking, leading to dry mouth and irritability as fluids gather.

Wang Shixiong adds: The character "Han" (Cold) in "Cold in the Chest" should be interpreted as "Tan" (Phlegm). Phlegm in the chest causes the moss-like appearance on the tongue. Fluids are blocked by phlegm, causing dry mouth and irritability. Phlegm-fluid is condensed water; thus, although thirsty, one cannot drink. Yang Yun states: This annotation is very clear. Whenever *Shanghan Lun* mentions "cold in the chest," it should be interpreted as phlegm.

If patients with chronic dampness are treated with purgatives, and they develop sweating on the forehead, slight panting, and free urination, the prognosis is fatal. If diarrhea persists incessantly, it is also fatal.

You Zaijing states: For dampness in the exterior, sweating is appropriate; for dampness in the interior, promoting diuresis is appropriate. Unless damp-heat accumulates into solid excrement, purgatives should not be used hastily. Yang Yun states: Purgatives must not be used recklessly in dampness syndromes. Sweating on the forehead and slight panting indicate Yang Qi detaching and moving upward; free urination and persistent diarrhea indicate Yin Qi rupturing and moving downward. The separation of Yin and Yang leads to death. Another interpretation suggests that difficulty in urination indicates death, meaning Yang floats up while Yin fails to descend. This is also plausible.

Wang Shixiong adds: Zhang Shiweng states: Extending from this, even if there is forehead sweating and slight panting, if both stool and urine are difficult, Yin Qi has not detached, and the root of Yang remains. Even if stool and urine are free, if there is no forehead sweating or panting, Yang Qi has not floated, and the root of Yin remains. This is not a separation of Yin and Yang, and rescue can be attempted based on deficiency or excess. However, if diarrhea persists incessantly, even without signs of Yang Qi detaching upward like head sweating or panting, it is still fatal. There are cases of persistent diarrhea with reversed closure of urine and forehead sweating, known as Guan Ge (Obstruction and Repletion). The classic states: In Guan Ge obstruction, if the head has no sweat, survival is possible; if there is sweat, death ensues.

Question: When Wind and Dampness contend, causing generalized body pain, the method dictates resolving it through sweating. If it rains continuously, and the doctor says sweating is appropriate, but the patient does not recover after sweating, why? Answer: If sweating produces profuse perspiration, only the Wind pathogen is expelled, while Dampness remains, hence the lack of recovery. To treat Wind-Dampness, sweating should be mild, appearing as if the patient is about to sweat slightly; then both Wind and Dampness will be expelled. Wang An notes: Even ancient practitioners exercised moderation in inducing sweating. Why do modern physicians insist on profuse sweating? This aligns with the instructions under Guizhi Tang (Cinnamon Twig Decoction) in *Shanghan Lun*.

Ni Chongzhi in *Shanghan Huiyan*: Patients with chronic dampness should not be mistreated with purgatives nor with sweating methods. Only in the syndrome of Wind-Dampness contention... Wind comes from the front, Dampness injures the lower parts; their collision causes generalized pain. This involves slight exterior pathogens, requiring sweating for resolution. However, during continuous rain, Dampness prevails. If profuse sweating is induced, not only will the Wind-Dampness pathogens remain unresolved, but True Qi will also be damaged. Wind enters quickly through gaps, while Dampness invades gradually. With Wind outside and Dampness inside, profuse sweating soaks clothes and bedding, turning sweat into dampness. Although Wind is gone, Dampness remains latent, hence no recovery. Mild sweating allows Zheng Qi (Upright Qi) to disseminate, nourishing the body and hair like mist and dew. As Zheng Qi moves, Xie Qi (Pathogenic Qi) retreats, Ying and Wei harmonize, and Wind-Dampness resolve simultaneously.

Zhang Xugu states: Treating Wind-Dampness requires unblocking Yang Qi, harmonizing Ying and Wei, and smoothing meridians so that Qi flows freely between interior/exterior and Yin/Yang. Internal dampness leaves via urine through Sanjiao (Triple Burner) transformation; external dampness resolves via mild sweating through Ying-Wei circulation. Once Yin-Dampness is resolved, Wind pathogens dissipate. Profuse sweating causes Yang Qi to surge wildly. Wind, being a Yang pathogen, escapes with the Qi, while Dampness, being Yin and stagnant, remains, failing to resolve. This distinguishes treating Wind-Dampness from Wind-Cold. Although both Cold and Damp are Yin pathogens, Cold is clear and easy to scatter, while Damp is turbid and sticky, necessitating different sweating methods.

In dampness disease, if there is body pain, fever, yellowish face, panting, dizziness, nasal congestion, and irritability, with a large pulse, normal appetite, and a peaceful abdomen, the pathology lies in Cold-Dampness in the head, causing nasal congestion. Administering medication nasally will cure it.

Zhang Xugu states: This refers to clear pathogens like fog and dew injuring the upper jiao. The three Yang meridians ascend to the head and run along the exterior. Cold-Dampness in the head obstructs exterior Qi, causing pain and fever. The Lung opens into the nose and governs the skin/hair. Pathogens enter via the nose; Dampness obstructs Yang, causing steaming and a yellow face. Qi obstruction causes panting; Qi stagnation causes headache, nasal congestion, and irritability—all due to Lung Qi blockage failing to descend, resulting in a paradoxically large pulse. This contrasts sharply with dampness injuring the lower jiao, where the Yin pulse is deep and fine. The Lung connects to the throat, the Stomach to the pharynx. Since the pathogen is in the Lung, not the Stomach, appetite is normal and the abdomen is peaceful. Only Cold-Dampness in the head causes nasal congestion. Acrid-aromatic and bitter-draining drugs should be administered nasally, similar to modern Sha medicines.

Wang Shixiong adds: Snuff can also be used; ancients used Genti San (Gardenia and Melon Trunk Powder). Unblocking Lung Qi allows dampness to transform into fluid and exit via the nose. Wang An notes: Sniffing Genti powder induces fluid discharge from the nose; ingesting it as a decoction induces vomiting.

In Shanghan, if Stagnant Heat resides in the interior, jaundice will certainly develop. Mahlian Qiaochi Xiaodou Tang (Ephedra, Forsythia, and Red Bean Decoction) is indicated.

Zhang Xugu states: Exterior pathogens remain unresolved, and damp-heat stagnates internally, causing jaundice. Ephedra releases the exterior; Forsythia and Red Beans benefit Lung Qi to clear damp-heat. Since the pathogen is in the meridians, it is resolved from the exterior.

Wang Shixiong adds: In my clinical practice, for summer damp-heat jaundice with exterior Wind-Cold, replacing Ephedra with Xiangru (Elsholtzia) in this formula is effective. Yang Yun states: Using Xiangru in summer is analogous to using Ephedra in winter.

In Shanghan, if there is jaundice and fever, Zhizi Bopi Tang (Gardenia and Phellodendron Bark Decoction) is indicated.

You Zaijing states: This is a syndrome of Heat stagnation without excess formation. Heat stagnation causes jaundice; lack of excess explains fever without abdominal fullness. Gardenia clears heat from above; Phellodendron Bark clears heat from below. Since the middle is not yet excessive, Licorice is needed to harmonize.

Shen Yaofeng states: Zhizi Bopi Tang clears heat and promotes diuresis; it is the principal formula for damp-heat. Cheng Fusheng considers Mahlian Qiaochi Xiaodou Tang the principal formula for damp-heat, failing to realize that Mahlian Qiaochi Xiaodou Tang is a sweating formula suitable only for exterior Wind-Cold complications, whereas Zhizi Bopi Tang is a diuretic formula. Yang Yun states: This analysis is very clear. If Mahlian Qiaochi Xiaodou Tang were the principal formula, Zhizi Bopi Tang would have no place, nor would the text's instruction to "promote diuresis."

In Shanghan, after seven to eight days, if the body is yellow like an orange peel, urination is difficult, and there is slight abdominal fullness, Yinchenshao Tang (Artemisia Scoparia and Mugwort Seed Decoction) is indicated.

You Zaijing states: This is a syndrome of Heat結 (knotting) in the interior. Yellow like an orange peel indicates bright yellow, characteristic of Heat Jaundice; Yin Jaundice is dull yellow. Heat knotting in the interior causes difficulty in urination and abdominal fullness, making Yinchenshao Tang appropriate to purge heat and unblock stasis.

In Yangming disease, fever and sweating indicate Heat venting outward, preventing jaundice. However, if only the head sweats, the body has no sweat (stopping at the neck), urination is difficult, and there is thirst for liquids, this indicates Stagnant Heat in the interior, leading to jaundice. Yinchenshao Tang is indicated.

You Zaijing states: "Heat venting" means Heat escapes outward with sweat. If Heat vents, pathogens disperse and cannot cause jaundice. If only the head sweats and the body does not, Heat cannot reach the exterior. Difficulty in urination prevents Heat from draining downward. Thirst for liquids exacerbates internal Heat accumulation and draws in external Dampness. Damp and Heat combine, stagnate, and fail to resolve, inevitably steaming into jaundice. Yinchenshao Tang is bitter-cold and purgative, expelling pathogens via urine.

In Yangming disease, if the entire face is red, purgatives must not be used. Using them will cause fever, jaundice, and difficulty in urination.

Shen Yaofeng states: This is a Shi Wen syndrome constrained by exterior Cold pathogens; Mahlian Qiaochi Xiaodou Tang is the principal formula. Removing chills makes it a Zhibo syndrome. Adding slight abdominal fullness makes it a Yinchenshao syndrome.

Zhang Xugu states: The previous section clarified jaundice syndromes; this clarifies the cause of jaundice. Facial redness indicates Heat stagnating in the meridians, requiring sweating. Purgatives damage Fu organ Qi, causing meridian Heat to move inward, combining with food/digestive Qi to steam into jaundice, blocking Sanjiao and causing difficulty in urination.

In Yangming disease, if there is no sweat, difficulty in urination, and mental restlessness (Ao Nao), jaundice will certainly develop.

Zhang Xugu states: Even without erroneous purgation, lack of sweat and difficulty in urination cause pathogenic Heat to close and knot. Mental restlessness combined with郁蒸 (stagnant steaming) of Stomach fluids leads to jaundice.

In Yangming disease, if Fire therapy is applied, resulting in slight forehead sweating and difficulty in urination, jaundice will certainly develop.

Yu Jiayan states: If Dampness stops and Heat stagnates, and Fire therapy is erroneously applied, Heat becomes more intense. Fluids rush upward; although the forehead sweats slightly, general sweating and urination become impossible. How can changes leading to jaundice be avoided?