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Cheng Yingmao stated: If a patient with Yangming disease presents with tidal fever (periodic high fever), it might seem like a sign of excess in the stomach. However, stomach excess must present with hard stools and frequent urination. Since the current case has loose stools and normal urination, this is heat but not the heat that has entered the fu organs. Considering the symptoms in the chest and hypochondrium, the primary formula should undoubtedly be Xiaochaihu Tang (Minor Bupleurum Decoction).

In Yangming disease, if there is hardness and fullness below the costal margin, constipation accompanied by vomiting, and a white coating on the tongue, Xiaochaihu Tang (Minor Bupleurum Decoction) may be administered. Once the Upper Jiao (Upper Burner) becomes unobstructed, body fluids can descend, the Stomach Qi harmonizes, and the patient will recover through slight sweating.

[Annotation] In Yangming disease, constipation combined with hardness/fullness below the costal margin and vomiting indicates that the Yangming disease has transmitted to Shaoyang (Lesser Yang). If the tongue coating is yellow and dry/astringent, it means the Yangming heat is not yet exhausted, and Daxiehu Tang (Major Bupleurum Decoction) should be used for simultaneous resolution of exterior and interior. Since the current tongue coating is white and slippery, the disease has transmitted to Shaoyang, so Xiaochaihu Tang (Minor Bupleurum Decoction) can be used to harmonize. By unblocking the Upper Jiao, vomiting stops; by allowing fluids to descend, bowel movements normalize; as Stomach Qi harmonizes, hardness and fullness are removed, and recovery occurs through slight sweating.

[Collected Annotations] Cheng Zhi said: This passage discusses Yangming disease concurrent with Shaoyang disease, for which Xiaochaihu Tang (Minor Bupleurum Decoction) is appropriate. Not only does loose stool indicate the stomach is not excess; even with constipation and vomiting, it indicates the pathogen has not fully entered the interior. Hardness and fullness are located in the hypochondrium, not the abdomen, and the tongue coating is white, not yellow, all indicating more signs of Shaoyang. Therefore, one should use Xiaochaihu Tang (Minor Bupleurum Decoction) to resolve Yin and Yang, leading to harmony between upper and lower, slight sweating, and the elimination of exterior and interior pathogens.

Cheng Yingmao said: Hardness/fullness below the costal margin, constipation, and vomiting are indications for Daxiehu Tang (Major Bupleurum Decoction). The reason for using Xiaochaihu Tang (Minor Bupleurum Decoction) here is that the white tongue coating still carries exterior cold. If the coating were not slippery but dry/astringent, it would correspond to "dry tongue with irritability, desiring to drink several liters of water," indicating interior heat has consumed body fluids, making this decoction unsuitable. He further stated: "Unblocking the Upper Jiao" corresponds to hardness/fullness below the costal margin; "fluids descending" corresponds to the tongue coating and vomiting; "Stomach Qi harmonizing" corresponds to constipation. The previous mention of Yangming disease was manifested through tidal fever; this mention is manifested through constipation.

For any patient with Chaihu Tang (Bupleurum Decoction) syndrome who undergoes purgation, if the Chaihu syndrome persists, administering Chaihu Tang (Bupleurum Decoction) again will result in intense internal heat and shivering, followed by fever, sweating, and recovery.

[Annotation] For any Chaihu Tang (Bupleurum Decoction) syndrome, if Chaihu Tang (Bupleurum Decoction) is withheld and purgation is mistakenly applied, provided no other disease develops and the Chaihu syndrome remains, Chaihu Tang (Bupleurum Decoction) can be readministered for recovery. However, due to the mistaken purgation, the righteous Qi is necessarily deficient; thus, recovery involves intense heat (zhengzheng) and shivering (zhenzhen), representing the struggle between pathogen and righteous Qi, culminating in sweating and resolution.

[Collected Annotations] Fang Youzhi said: Intense heat and shivering manifest as "battle sweat" (Zhan Han); recovery requires this process because the interior is deficient after purgation.

Cheng Zhi said: The pathogen returns to the exterior, causing intense heat; deficiency of righteous Qi after purgation causes shivering.

After six or seven days of illness, with a slow, floating, and weak pulse, aversion to wind and cold, warm hands and feet, if the physician performs purgation two or three times, leading to inability to eat, fullness and pain below the costal margin, yellowing of the face and body, stiffness of the neck, and difficulty urinating, administering Chaihu Tang (Bupleurum Decoction) will likely result in a sensation of heaviness in the rectum later. If the patient is thirsty but vomiting upon drinking water, Chaihu Tang (Bupleurum Decoction) is contraindicated; eating food will cause hiccups.

[Commentary] The four characters "eating food causes hiccups" are interpolations (erroneous additions). There are cases of vomiting after eating, but never hiccups after eating.

[Annotation] Six or seven days after onset is when Shaoyang (Lesser Yang) disease transitions to Taiyin (Greater Yin). A slow pulse is characteristic of Taiyin; floating and weak pulses are characteristic of Taiyang; aversion to wind and cold are Taiyang signs; warm hands and feet are Taiyin signs. The physician failed to use Chaihu Guizhi Tang (Bupleurum and Cinnamon Twig Decoction) to harmonize the exterior and interior, instead performing purgation repeatedly, damaging both exterior and interior. Now, inability to eat and fullness/pain below the costal margin appear similar to Shaoyang signs but are not truly Shaoyang. Yellowing of the face and body indicates Taiyin signs are established; neck stiffness indicates Yangming pathogen persists. Difficulty urinating indicates fluid depletion from repeated purgation. These result from the physician's erroneous purgation, causing mixed exterior-interior and simultaneous Yin-Yang pathology. If one mistakenly administers Chaihu Tang (Bupleurum Decoction) based solely on the presence of hypochondriac fullness/pain (without requiring all Shaoyang symptoms), it will lead to rectal heaviness, driving the pathogen deeper into Taiyin. Although thirst exists, it is caused by fluid depletion from purgation. Vomiting upon drinking is not the original Shaoyang vomiting but results from erroneous purgation; thus, Chaihu Tang (Bupleurum Decoction) is contraindicated.

[Collected Annotations] Cheng Zhi said: Previously, it was stated that seeing one Chaihu symptom is sufficient for diagnosis. Here, it clarifies that even with hypochondriac fullness/pain, Chaihu Tang (Bupleurum Decoction) may be inappropriate, serving as a warning.

Cheng Yingmao said: Differentiating via thirst: in the previous case, warm hands/feet with thirst indicated interior heat without prior purgation, allowing natural digestion of water. Here, thirst with immediate vomiting upon drinking indicates thirst due to dryness and fluid loss in the Diaphragm, with middle deficiency preventing water digestion, unrelated to Stomach Yang. Thus, can we say that for Shaoyang, seeing one symptom suffices for Chaihu Tang? Can we say that if Chaihu symptoms persist after purgation, Chaihu Tang can be readministered?

In Shanghan (Cold Damage) lasting six or seven days, with mild fever and aversion to cold, painful joints, mild vomiting, subcostal support-like fullness (Zhijie), and unresolved exterior signs, Chaihu Guizhi Tang (Bupleurum and Cinnamon Twig Decoction) is the primary formula.

[Annotation] In Shanghan lasting six or seven days, presenting with mild fever/aversion to cold, painful joints, mild vomiting, and subcostal fullness, this indicates Taiyang pathogen transmitting to Shaoyang. Therefore, half the dose of Guizhi Tang (Cinnamon Twig Decoction) is used to disperse residual Taiyang pathogen; half the dose of Chaihu Tang (Bupleurum Decoction) is used to resolve Shaoyang vomiting and stagnation. It is not named Guizhi Chaihu Tang because, although Taiyang exterior signs persist, the pathological mechanism is evident in the Shaoyang interior. Placing Chaihu before Guizhi emphasizes resolving Shaoyang primarily while dispersing Taiyang secondarily. "Zhi" means side or small. "Zhijie" refers to slight stagnation on the side of the epigastrium.

[Collected Annotations] Fang Youzhi said: Zhijie refers to the bones and joints of the four limbs. Zhijie (support-knot) refers to the accumulation and knotting of fluid retention. From fever to mild vomiting represents Taiyang exterior, hence "exterior signs unresolved."

Cheng Zhi said: This describes pathogen entering Shaoyang while Taiyang signs remain. Fever, aversion to cold, and joint pain are Taiyang signs; however, mild aversion to cold and pain limited to joints (without neck stiffness) indicate reduced Taiyang signs. Vomiting and subcostal fullness are Shaoyang signs; however, mild vomiting and knotting only at the side of the epigastrium (not between both hypochondria) indicate shallow Shaoyang involvement. In such cases, Chaihu Tang (Bupleurum Decoction) should harmonize Shaoyang, supplemented by Guizhi Tang (Cinnamon Twig Decoction) to disperse Taiyang; this is an immutable method.

Chaihu Guizhi Tang Formula
Chaihu (Bupleuri Radix) (4 liang), Guizhi (Cinnamomi Ramulus) (1.5 liang), Renshen (Ginseng Radix et Rhizoma) (1.5 liang), Gancao (Glycyrrhizae Radix et Rhizoma, prepared) (1 liang), Banxia (Pinelliae Tuber) (washed, 2.5 he), Huangqin (Scutellariae Radix) (1.5 liang), Shaoyao (Paeoniae Radix) (1.5 liang), Dazao (Ziziphi Jujubae Fructus, split) (6 pieces), Shengjiang (Zingiberis Rhizoma Recens, sliced) (1.5 liang).
Nine ingredients. Boil in 7 sheng of water, reduce to 3 sheng, remove dregs, take 1 sheng warm.

[Collected Commentary] Ke Qin said: Among Zhang Zhongjing's works, the Chaihu and Guizhi formulas are most valued. Guizhi Tang (Cinnamon Twig Decoction) resolves Taiyang muscle-surface pathogen and regulates the surface of all meridians; Xiaochaihu Tang (Minor Bupleurum Decoction) resolves Shaoyang half-exterior/half-interior pathogen and harmonizes the half-exterior of the Three Yang. Hence, outside the Six Meridians, there are specific references to Guizhi Syndrome and Chaihu Syndrome, showing these formulas' broad applicability beyond single meridians. The "Floating Yang, Weak Yin" section annotates Guizhi Syndrome; the "Weak Blood, Exhausted Qi" section annotates Chaihu Syndrome. Both Guizhi and Chaihu syndromes have "ruined" (Huai Bing) conditions and ambiguous presentations. For example, cases resembling Guizhi syndrome include leg cramps and chest oppression; cases resembling Chaihu syndrome include thirst with vomiting upon drinking and desire to vomit with chest pain. This passage describes Shanghan at day 6-7, where fever/aversion to cold (exterior signs) and subcostal fullness (interior signs) coexist, requiring simultaneous exterior-interior resolution. Since aversion to cold is mild, fever is mild; joint pain implies no general body ache; mild vomiting implies mild epigastric knotting ("Zhijie"). Thus, exterior signs are light, interior signs are not severe. Half-dose Guizhi disperses residual Taiyang pathogen; half-dose Chaihu resolves mild Shaoyang knotting. If mouth is not dry and body has slight heat, Renshen should theoretically be removed; however, since righteousness is deficient by day 6-7 despite unresolved pathogen, Renshen is retained. With exterior signs present but pathology rooted in the interior, placing Chaihu before Guizhi creates a light agent for dual resolution of Two Yangs.

After five or six days of Shanghan, having undergone sweating followed by purgation, if there is chest/hypochondriac fullness with slight knotting, difficulty urinating, thirst without vomiting, only head sweating, alternating chills and fever, and irritability, the disease is unresolved. Chaihu Guizhi Ganjiang Tang (Bupleurum, Cinnamon Twig, and Dried Ginger Decoction) is the primary formula.

[Annotation] After five or six days of Shanghan, if sweating fails to resolve the exterior and purgation is subsequently applied, pathogen sinking into Yangming interior would cause Jie Xiong (Chest Binding) or Pi Ying (Epigastric Fullness) with协同 Heat diarrhea. Here, pathogen sinks into Shaoyang interior, causing chest/hypochondriac fullness with slight knotting. Difficulty urinating, thirst, and absence of vomiting indicate fluid damage from sweating/purgation, not fluid retention. While texts describe head sweating with fever/irritability as Yangming heat stagnation, here, with alternating chills/fever and irritability but no Yangming signs, the head sweating is Shaoyang exterior heat stagnation steaming upward. This is a Shaoyang exterior-interior unresolved condition, treated with Chaihu Guizhi Ganjiang Tang to resolve half-exterior pathogen and disperse half-interior knotting.

[Collected Annotations] Lin Lan said: By day 5-6 post-sweating/purgation, pathogen should resolve. Persistent chest/hypochondriac fullness/knotting, chills/fever, and irritability indicate pathogen remains in half-exterior/half-interior. Difficulty urinating and thirst indicate fluid loss and internal dryness post-sweating/purgation. If heat-fluid existed, vomiting would occur; absence of vomiting rules out heat-fluid. Sweating usually brings harmony; isolated head sweating indicates insufficient fluids and lack of harmony. Chaihu Guizhi Ganjiang Tang resolves exterior-interior and restores fluids.

Wang Hu said: Head sweating in Shanghan indicates Yang pathogen constrained at the exterior, not Yang deficiency above.

Chaihu Guizhi Ganjiang Tang Formula
Chaihu (Bupleuri Radix) (8 liang), Guizhi (Cinnamoli Ramulus) (3 liang), Ganjiang (Zingiberis Rhizoma) (2 liang), Gualougen (Trichosanthis Radix) (4 liang), Huangqin (Scutellariae Radix) (3 liang), Muli (Ostreae Concha) (2 liang), Gancao (Glycyrrhizae Radix et Rhizoma, prepared) (2 liang).
Seven ingredients. Boil in 12 sheng of water, reduce to 6 sheng, remove dregs, decoct again to 3 sheng. Take 1 sheng warm, three times daily. Initial dose may cause slight irritability; subsequent doses induce sweating and cure.

[Formula Analysis] Shaoyang exterior-interior unresolved requires combining Chaihu and Guizhi, a variation of Xiaochaihu Tang (Minor Bupleurum Decoction). Renshen is omitted because righteous Qi is not deficient; Banxia is halved because there is no vomiting, avoiding drying effects. Gualougen is added to stop thirst and generate fluids; doubling Chaihu and adding Guizhi targets Shaoyang exterior; adding Muli softens Shaoyang knotting. Ganjiang assists Guizhi to dispel chills; Huangqin assists Chaihu to clear fever and counteracts Ganjiang's potential to worsen irritability. As herbs vary in temperature, Gancao harmonizes them. Initial slight irritability indicates drug efficacy has not yet reached; subsequent sweating confirms resolution requires diaphoresis.

If thirst develops after taking Chaihu Tang (Bupleurum Decoction), the condition belongs to Yangming; treat according to Yangming methods.

[Annotation] If Wind-Cold pathogen transmits from Yangming to Shaoyang, initial thirst is absent. Thirst appearing after Chaihu Tang (Bupleurum Decoction) indicates Shaoyang transforming into Yangming. "Treat according to method" means distinguishing meridian vs. fu organ manifestations for treatment. Ge Gen Tang (Kudzu Decoction), Bai Hu Tang (White Tiger Decoction), or Tiao Wei Cheng Qi Tang (Regulate the Waist and Direct to the Interior Decoction) may be selected based on suitability.

[Collected Annotations] Fang Youzhi said: "Yi" means completion. Thirst completing Chaihu Tang administration indicates persistent, not transient, thirst, confirming heat has entered the Stomach and depleted fluids, hence "belongs to Yangming."

Shen Mingzong said: Thirst after Chaihu Tang indicates Shaoyang pathogen did not transmit to the Three Yin but moved to Yangming; treat according to Yangming manifestations.

Zheng Zhongguang said: The distinction between Shaoyang and Yangming lies in vomiting and thirst: thirst indicates transformation to Yangming; vomiting indicates retention in Shaoyang. Even with Yangming signs, excessive vomiting precludes purgation as the pathogen remains in Shaoyang. Chaihu Tang should stop thirst; if thirst worsens post-administration, heat has entered the Stomach Fu, consuming fluids, belonging to Yangming Stomach disease.

In Shanghan lasting five or six days, with head sweating, mild aversion to cold, cold hands/feet, epigastric fullness, desire not to eat, hard stools, and fine pulse, this is "Yang Mild Knotting" (Yang Wei Jie), involving both exterior and interior signs. A sunken pulse also indicates interior involvement. Sweating indicates mild Yang constraint. If it were pure Yin Knotting, there would be no exterior signs, only interior. This is half-exterior, half-interior. Even if the pulse is sunken and tight, it cannot be Shaoyin disease because Yin diseases do not present with sweating. Head sweating confirms it is not Shaoyin. Xiaochaihu Tang (Minor Bupleurum Decoction) may be given. If symptoms persist, defecation will resolve the condition.

[Commentary] "Fine pulse" should be "sunken-fine pulse," evident from the text "Sunken pulse also indicates interior." The character "tight" in "even if sunken-tight" should be "fine," as "tight" appears nowhere else in the passage, making "even if" nonsensical. This is a transcription error.

[Annotation] At day 5-6, although exterior Yang pathogen (head sweating, mild aversion to cold) persists, interior Yang knotting (epigastric fullness, anorexia, hard stools) has formed. Cold hands/feet and sunken-fine pulse indicate the Yang knot is very mild, hence "Yang Mild Knotting," involving both exterior and interior. Sunken-fine pulse suggests interior Yin excess, but head sweating indicates exterior Yang constraint. Pure Yin Knotting would lack exterior signs like head sweating. Since it is not pure interior Yin, it is half-exterior/half-interior Yang Mild Knotting. Thus, sunken-fine pulse does not indicate Shaoyin disease, as Yin diseases do not sweat. Head sweating confirms non-Shaoyin status. Xiaochaihu Tang (Minor Bupleurum Decoction) harmonizes the lack of whole-body sweating and mild aversion to cold. If unresolved, hard stools remain, requiring purgation for resolution.

[Collected Annotations] Yu Chang said: "Yang Mild Knotting" means residual mild Yang pathogen constraint. Old annotations interpreting it as Yang Qi deficiency are incorrect. If true, head sweating would indicate Yang collapse, not half-exterior/half-interior pathology. Examining the text "assuming pure Yin Knotting... pure Yin pathogen internally knotted... no exterior signs" clarifies the meaning.

Cheng Zhi said: This discusses Shaoyang disease mimicking Shaoyin, requiring careful pulse/symptom differentiation.

Cheng Yingmao said: Fine and sunken pulses are Yin pulses. Co-occurring with Yang signs indicates Yang heat constraint, unrelated to Shaoyin. Yang Qi constraint makes both Yang signs and pulses resemble Yin.

Shen Mingzong said: Resolution via defecation implies using Daxiehu Tang (Major Bupleurum Decoction) principles.

Wu Renju said: This case is often misdiagnosed as Yin-Cold and treated with warming herbs, causing adverse reactions, due to focusing on aversion to cold, cold extremities, and fine/sunken pulse without investigating the origin.

Zhou Yangjun said: This passage features aversion to cold, cold limbs, anorexia, and fine/sunken pulses, mimicking Yin syndrome, making differentiation difficult. Zhang Zhongjing explicitly uses "Yang Mild Knotting" to clarify history. Head sweating indicates Yang (Yin does not sweat). By day 5-6, headache/fever indicate Yang nature; thus, Shaoyin pulse does not equal Shaoyin disease. However, lacking typical Shaoyang signs, why call it Shaoyang? Zhang explains it is half-exterior/half-interior. With many interior signs, pure exterior diaphoretics are contraindicated; with exterior signs mimicking Yin, pure interior warming is contraindicated. Xiaochaihu Tang (Minor Bupleurum Decoction) extracts pathogen from the half-exterior/half-interior boundary. If hard stools persist, purgation is necessary. Zhang elaborates to clarify that cold limbs/mild aversion to cold result from Yang constraint failing to reach limbs, causing isolated head sweating.

In Shanghan, with Yang pulse coarse (Se) and Yin pulse string-taut (Xian), abdominal acute pain is expected per theory. First administer Xiao Jianzhong Tang (Minor Construct the Middle Decoction); if ineffective, administer Xiaochaihu Tang (Minor Bupleurum Decoction) as primary.

[Annotation] Floating-coarse pulse indicates Deficiency of Ying and Wei; sunken-string-taut pulse indicates Wood invading Earth. Ying/Wei deficiency leads to exterior deficiency; Wood invading Earth leads to interior tension. Only with exterior deficiency and interior tension does acute abdominal pain occur. Hence, Xiao Jianzhong Tang (Minor Construct the Middle Decoction) is used first to tonify Ying/Wei and relieve interior tension/pain. If ineffective, pathogen likely remains in the exterior. Coarse pulse indicates Ying/Wei obstruction; string-taut pulse is the root Shaoyang pulse. Thus, Xiaochaihu Tang (Minor Bupleurum Decoction) is administered according to protocol. Cheng Wuji's modification (removing Huangqin, adding Shaoyao) to disperse exterior and regulate middle is also valid.

[Collected Annotations] Wang Hu said: Persistence of string-taut pulse with continued pain indicates ineffectiveness, signifying lingering pathogen in Shaoyang meridian.

In Shanghan, with Heat in the Chest, Pathogenic Qi in the Stomach, abdominal pain, and desire to vomit, Huanglian Tang (Coptis Decoction) is the primary formula.

[Annotation] Desire to vomit in unresolved Shanghan indicates Heat pathogen reversing upward in the Chest; abdominal pain indicates Cold pathogen attacking inward in the Stomach. Heat in Chest, Cold in Stomach disrupt Yin-Yang harmony and normal ascending/descending functions. Huanglian Tang (Coptis Decoction) uses cold and hot herbs together, sweet and bitter flavors combined, to regulate Yin-Yang and harmonize. This reflects external pathogens causing upper-lower cold-heat disharmony. Internal miscellaneous diseases with vomiting/abdominal pain are often due to retained food. Thus, external vs. internal etiologies yield similar symptoms but different pathogenesis.

[Collected Annotations] Cheng Zhi said: Yin pathogen in abdomen prevents Yang from harmonizing Yin, causing pain; Yang pathogen above prevents Yin from harmonizing Yang, causing vomiting/reversal.

Wang Hu said: *Shanglun Pian* distinguishes Wind/Cold into Yin/Yang Cold/Heat. However, Wind may originate as Cold, and Cold may transform into Heat; one should not be rigid.

Zheng Zhongguang said: Heat pathogen strikes the Upper Jiao; Cold pathogen strikes the Lower Jiao. Yin-Yang fail to interact, losing normal ascending/descending order.

Huanglian Tang Formula
Huanglian (Coptidis Rhizoma) (3 liang), Gancao (Glycyrrhizae Radix et Rhizoma, prepared) (3 liang), Ganjiang (Zingiberis Rhizoma) (3 liang), Renshen (Ginseng Radix et Rhizoma) (2 liang), Guizhi (Cinnamomi Ramulus) (3 liang), Banxia (Pinelliae Tuber) (washed, 0.5 sheng), Dazao (Ziziphi Jujubae Fructus, split) (12 pieces).
Seven ingredients. Boil in 1 dou of water, reduce to 6 sheng, remove dregs. Take warm, three times during day, twice at night.

[Formula Analysis] Shanghan pathogen enters the interior, transforming based on pre-existing organ cold/heat. For example, Yangming disease with hardness/fullness, constipation, vomiting, and white tongue coating is treated with Xiaochaihu Tang (Minor Bupleurum Decoction); Taiyang disease post-purgation with interior deficiency, restlessness, and tongue coating resembling moss is treated with Zhizi Chi Tang (Gardenia and Fermented Soybean Decoction). These follow the pattern of "Cold in Chest, Heat in Dantian." This case follows the Stomach...