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Nine methods for the Taiyang (Greater Yang) channel, one method for the Taiyin (Lesser Yin) channel, seven methods for the Shaoyin (Lesser Yin) channel, five methods for Shaoyin death syndromes, five methods for the Jueyin (Terminal Yin) channel, and five methods for Jueyin death syndromes. Although the *Zubing Lun* (Treatise on Acute Diseases) has been lost, the *Shanghan Lun* (Treatise on Cold Damage) is indeed preserved. Zhang Zhongjing, regarding cold damage syndromes characterized by faint Yang and abundant Yin with aversion to cold, did not wait for symptoms to become manifest; instead, he employed Aconite (*Fuzi*) and Dried Ginger (*Ganjiang*) early in treatment, combined with moxibustion. How much more so for acute diseases? And how much more so for acute diseases where symptoms are extremely manifest? Here, I have specially re-analyzed and elaborated these principles, providing not only a basis for treating acute diseases but also ensuring that critical cold damage syndromes cannot escape detection or proper management.

Zhang Zhongjing employed nine methods using Aconite (*Fuzi*) to treat Yang deficiency during the initial stage of cold damage transmitting heat pathogens in the Taiyang channel.

The first method addresses cases where improper use of diaphoretic agents caused sweating that would not stop. The remedy is Guizhi Tang (Cinnamon Twig Decoction) with added Aconite (*Fuzi*). Symptoms include aversion to wind, difficulty urinating, slight stiffness in the four limbs making flexion and extension difficult. Wind damaging the Wei (Defensive) level originally causes aversion to wind; combined with improper sweating, the interstices (*Couli*) open completely, worsening the aversion to wind. Difficulty urinating occurs because Yang governs Qi transformation; when Yang collapses externally, the Qi transformation of the Bladder naturally fails. Slight stiffness in the limbs results from the fact that the limbs are the root of all Yang; collapse of Yang and depletion of fluids lead to dysfunction of the bone structures. For patients with Yang deficiency who were improperly induced to sweat, if this formula can rescue Yang, could it not have been used beforehand to release the muscle layer and induce appropriate sweating? Zhang Zhongjing’s frequent addition of Ginseng (*Renshen*) and Aconite (*Fuzi*) to Guizhi Tang reveals profound intent.

The second method addresses cases where improper sweating led to palpitations, dizziness, and body tremors, leaving no other recourse. The remedy is Zhenwu Tang (True Warrior Decoction). Symptoms include persistence of fever after sweating, epigastric palpitations, dizziness, body tremors, and a sensation of trembling as if about to fall to the ground. If fever persists despite sweating, the pathogen remains while the healthy Qi is severely damaged. Interior deficiency causes palpitations; upper deficiency causes dizziness; meridian deficiency causes tremors; whole-body shaking indicates signs of Yang collapse everywhere. Thus, Zhenwu Tang is used to guard the passes and stabilize the condition.

The third method addresses cases where sweating failed to resolve the disease, resulting in increased aversion to cold. The remedy is Shaoyao Gancao Fuzi Tang (Peony, Licorice, and Aconite Decoction). Symptoms include unresolved disease after sweating and increased aversion to cold due to deficiency. Aversion to cold before sweating indicates excess pathogen and exterior excess; aversion to cold after sweating indicates retreat of the pathogen and exterior deficiency. Yang deficiency causes aversion to cold, justifying the use of Aconite (*Fuzi*). However, since the disease remains unresolved after sweating, heat likely persists. With heat present and no other symptoms, this represents Yin deficiency heat, requiring Peony (*Shaoyao*) to consolidate Yin. This is a remedy for simultaneous Ying (Nutritive) and Wei (Defensive) deficiency.

The fourth method addresses cases where sweating or purgation failed to resolve the disease, accompanied by restlessness (*Fan*) and agitation (*Zao*). The remedy is Fuling Sini Tang (Poria, Four Reversal Decoction). Improper sweating causes Yang collapse and exterior deficiency; improper purgation causes Yin collapse and interior deficiency. With both Yin and Yang deficient and the pathogen unresolved, restlessness and agitation arise. This decoction rescues the condition. The previous case involved Ying and Wei deficiency; this case involves both exterior and interior deficiency. The sophistication of formula formulation extends beyond simple exterior-interior distinctions. Generally, *Fan* (restlessness) refers to heart restlessness, while *Zao* (agitation) refers to kidney agitation. Thus, Dried Ginger (*Ganjiang*) and Aconite (*Fuzi*) enter the Kidney to resolve agitation, while Poria (*Fuling*) and Ginseng (*Renshen*) enter the Heart to resolve restlessness.

The fifth method addresses cases where improper purgation led to a rapid pulse (*Cu*), chest fullness, and mild aversion to cold. The remedy is Guizhi Tang without Peony (*Shaoyao*) plus Aconite (*Fuzi*) to reverse the adverse effect. Although a rapid pulse suggests residual exterior pathogen, chest fullness without knotting indicates damage to Yang Qi in the chest due to improper purgation. Combined with mild aversion to cold, even the True Yang of the Kidney is damaged, allowing turbid Yin to dominate. Therefore, the yin-nourishing Peony (*Shaoyao*) is removed, and Aconite (*Fuzi*) is added to restore Yang.

The sixth method addresses cases where purgation was followed by sweating, resulting in a deep and faint pulse (*Chenwei*), absence of significant fever, daytime irritability preventing sleep, nighttime quietness, absence of vomiting or thirst, no exterior syndrome, deep faint pulse, and no significant body heat. The remedy is Ganjiang Fuzi Tang (Dried Ginger and Aconite Decoction). As noted previously, purgation followed by sweating causes chills and fine/faint pulses due to internal and external deficiency. Improper sweating collapses Yang; improper purgation collapses Yin. No formula was given here because methods for restoring Yang with Aconite (*Fuzi*) and benefiting Yin with Ginseng (*Renshen*) are already established. This section teaches subtle principles: Yang collapse syndromes are twice as common as Yin collapse. Yang operates during the day; thus, heat and irritability preventing sleep appear during the day. Yin operates at night; thus, quietness without vomiting or thirst appears at night. Can balanced Yin-Yang tonics like Aconite and Ginseng suffice? Only the pungent-heat nature of Dried Ginger (*Ganjiang*) and Aconite (*Fuzi*) can sufficiently restore Yang to counterbalance the predominant Yin.

The seventh method addresses the binding of Wind-Damp pathogens. The remedy is Gancao Fuzi Tang (Licorice and Aconite Decoction) to separate and resolve them. Symptoms include severe joint pain, inability to flex or extend, extreme pain upon touch, sweating, shortness of breath, difficulty urinating, aversion to wind with desire to keep clothes on, or slight bodily swelling. Wind affects the upper body first; Dampness affects the lower body first. When they bind together, they enter meridians, flow into joints, permeate bones, and reach every part of the body, causing pain everywhere. Shortness of breath indicates excessive sweating leading to Yang collapse and severe Yang injury. Thus, Licorice (*Gancao*), Aconite (*Fuzi*), Atractylodes (*Baizhu*), and Cinnamon Twig (*Guizhi*) are used to restore Yang and resolve internal/external pathogens. Additionally, for Cold damaging the Ying level without sweating, Guizhi Fuzi Tang (Cinnamon Twig and Aconite Decoction) is used, which is this formula minus Atractylodes (*Baizhu*) plus Fresh Ginger (*Shengjiang*) and Jujube (*Dazao*). If Cold damages the Ying level without sweating, but stool is hard and urination is normal, the pathogen is not in the exterior; thus, Cinnamon Twig (*Guizhi*) is removed while retaining Atractylodes (*Baizhu*) to benefit Earth and dry Dampness. These three formulas represent three methods merged into one, showing that treating Wind-Damp binding prioritizes restoring Yang.

The eighth method addresses epigastric stuffiness (*Pi*) with aversion to cold and sweating. The remedy is Fuzi Xixin Tang (Aconite and Artemisia Decoction), which restores Yang and resolves stuffiness simultaneously. There are five Xixin Tang variants: Gancao Xixin Tang, Banxia Xixin Tang, Shengjiang Xixin Tang, Huanglian Xixin Tang, and Fuzi Xixin Tang. Due to aversion to cold and sweating indicating Yang deficiency, this is more urgent than Yin-type stuffiness. Boiling water is used to steep the stuffiness-resolving herbs, while concentrated decocted Aconite juice is added separately. Though achieving two goals in one, the emphasis on restoring Yang is clear.

The ninth method addresses adverse effects from improper use of Yangdan Tang. The remedy is Sini Tang (Four Reversal Decoction) to reverse the adverse effect. Yangdan Tang is Guizhi Tang with added Scutellaria (*Huangqin*). In patients with inherently weak Yang, even in summer, Yang is outside and Yin inside; adding Aconite (*Fuzi*) to Guizhi Tang is acceptable, but adding Scutellaria (*Huangqin*) is not, leading to limb reversal (*Jue*). If compounded by heavy sweating or burning needle therapy, the error increases, and only Sini Tang can restore Yang. The Yangming and Shaoyang channels absolutely do not use Aconite (*Fuzi*); only the Taiyang channel has indications necessitating its use. The Taiyang Bladder is the residence of the Kidney; when Kidney Yang is deficient and Yin abundant, it transmits to the Bladder. Thus, symptoms like faint pulse, aversion to cold, leaking sweat, aversion to wind, palpitations, dizziness, muscle twitching, and agitation appear. Even in transmitting heat syndromes, Ginger and Aconite are indispensable to eliminate Yin and restore Yang. For acute diseases not arising from transmission but appearing suddenly, why delay using Aconite (*Fuzi*) and Dried Ginger (*Ganjiang*)?

One Method for the Taiyin Channel
Cold damage transmitting to the Taiyin channel presents with spontaneous diarrhea and lack of thirst, indicating inherent Cold in the Spleen (Earth organ). Thus, Sini Tang (Four Reversal Decoction) is used to warm the Earth. Using Sini Tang instead of Lizhong Tang for Taiyin Cold demonstrates Zhang Zhongjing’s profound insight. Water and Earth share a source; warm water in winter warms Earth, while cold water in summer cools Earth. Earth Cold implies Yin inside and Yang outside, a serious matter. Using Sini Tang to warm Earth is miraculous.

Seven Methods for the Shaoyin Channel
In Shaoyin disease presenting on days 1-2 with a neutral mouth (no dryness/thirst) and aversion to cold in the back, Moxibustion combined with Fuzi Tang (Aconite Decoction) is used for simultaneous internal and external treatment. A neutral mouth indicates no interior syndrome. The back is the pathway of the Du Meridian, governing ascending Yang; localized back cold indicates Yang deficiency with Yin pathogen rising. External moxibustion and internal warming are applied until Yin dissipates and Yang recovers. Ignorant people might think such urgency is unnecessary for mild early symptoms, but Zhang Zhongjing acts early because early manifestation of Yang deficiency/Yin abundance allows timely intervention ("seeing the small to know the significant"). Waiting until days 3-4 makes recovery impossible. After day 4, it is clearly not an acute onset, so urgency is less relevant.

In Shaoyin disease presenting on days 2-3 without interior syndromes, Mahuang Fuzi Gancao Tang (Ephedra, Aconite, and Licorice Decoction) is used for mild diaphoresis. Absence of vomiting, diarrhea, restlessness, or thirst confirms the need to resolve from the exterior. However, Shaoyin generally prohibits sweating as it risks Yang collapse. This specific case involves external fever/no sweating and internal absence of interior symptoms, allowing warming of meridians and dispersal of Cold to achieve mild sweating. This principle is subtle. In Taiyang, there is Guizhi plus Aconite, but no Mahuang plus Aconite. Taiyang lacks faint pulse/aversion to cold; if such symptoms appear, Aconite is needed. If vomiting/diarrhea/restlessness appear, Yang collapse is imminent, and Mahuang is contraindicated. Using Mahuang in acute diseases can be fatal instantly.

For Shaoyin disease with body pain, cold hands/feet, joint pain, and deep pulse, Fuzi Tang (Aconite Decoction) is used. Generalized joint pain suggests Taiyang cold damage, but cold extremities and deep pulse confirm Kidney True Yang deficiency. Body/joint pain here stems from Yang deficiency, unrelated to external pathogens. Fuzi Tang assists Yang to overcome Kidney Cold, resolving pain. Misidentifying this as external pathogenic pain could be fatal.

For Shaoyin diarrhea with a faint pulse, Baitong Tang (White Through Decoction) is used. If diarrhea persists with reversal cold, absent pulse, dry retching, and agitation, Baitong Tang plus Pig Bile (*Zhudanhui*) is used. Sudden emergence of pulse after administration indicates death; gradual continuation indicates survival. Shaoyin diarrhea with Kidney deficiency and盛 Cold requires Baitong Tang to drive out Cold and assist Yang. If diarrhea persists and pulse vanishes with worsening vomiting/agitation, it is due to Cold rejecting hot medicine. Pig Bile acts as a guide to prevent rejection, allowing Yang restoration and pulse return. Gradual pulse return ensures life; sudden pulse emergence signals death, highlighting the difficulty of retaining floating Yang.

For Shaoyin diarrhea with fluid retention, cough, or vomiting, modified Zhenwu Tang (True Warrior Decoction) is used. Severe Yin Cold and flooding fluids result from Yang deficiency failing to control water and generate Earth to restrain water. Symptoms include abdominal pain, difficulty urinating, heavy/painful limbs, spontaneous diarrhea, or variable urination/cough/vomiting due to fluid flooding. Modifications depend on specific presentations (see *Shanglun Pian*).

For Shaoyin diarrhea with interior Cold and exterior Heat, cold extremities, and faint/nearly absent pulse, modified Baitong Sini Tang (White Through Four Reversal Decoction) is used. Add 9 stalks of Scallion (*Cong*) for red face; remove Scallion, add 2 liang Peony (*Shaoyao*) for abdominal pain; add 2 liang Fresh Ginger (*Shengjiang*) for vomiting; remove Peony, add 1 liang Platycodon (*Jiegeng*) for sore throat; remove Platycodon, add 2 liang Ginseng (*Renshen*) if diarrhea stops but pulse does not return.

Five Death Syndromes of Shaoyin
Shaoyin disease with aversion to cold, curled posture, diarrhea, and cold extremities is untreatable (Yin abundance, no Yang).
Shaoyin disease with cessation of diarrhea accompanied by dizziness and periodic vertigo/death indicates death. While Yang recovery stops diarrhea, cessation with worsening vertigo indicates prior Yin exhaustion. Yang floats upward without foundation, scattering Shen Qi.
Shaoyin disease with reversal cold, aversion to cold, curled posture, absent pulse, and agitation without restlessness indicates death. Absent pulse means Yang has perished; agitation without restlessness means solitary Yin will perish instantly.
Shaoyin disease with high-pitched breathing on days 6-7 indicates death. High breathing signifies True Yang floating upward without root; Shen Ji (spirit mechanism) perishes.
Shaoyin disease with faint/deep/thin pulse, desire to sleep, sweating without restlessness, urge to vomit, progressing to spontaneous diarrhea, agitation, and insomnia on days 5-6 indicates death. Cold damage forbids Yin pulses; Zhang Zhongjing advises urgent warming for deep pulses. Faint/deep/thin pulse with lethargy/sweating/non-restlessness shows Yang failure. Urge to vomit shows Yin pathogen attacking upward. Spontaneous diarrhea indicates organ Qi exhaustion. Initial non-restlessness turning to agitation, and initial sleepiness turning to insomnia, shows the last thread of Yang is chaotic and irrecoverable.

Five Methods for the Jueyin Channel
Patients with cold extremities stating "I do not have Jie Xiong (chest knotting)," lower abdominal fullness, and tenderness upon pressure suffer from Cold binding at the Bladder Guan Yuan point. Yang pathogens bind in Yang (chest); absence of chest knotting indicates Yang deficiency. Yin pathogens bind in Yin; Cold binding at Guan Yuan indicates Yin abundance.

For cold damage with rapid pulse and cold extremities, moxibustion is used. Rapid pulse indicates internal sinking of Yang Qi and distress. Combined with cold extremities (Yang faint, Yin abundant), death is likely unless moxibustion opens Yang.

For excessive sweating with persistent fever, internal cramping, limb pain, diarrhea, reversal cold, and aversion to cold, Sini Tang (Four Reversal Decoction) is used. Excessive sweating without pathogen resolution indicates Yang deficiency. Internal cramping, limb pain, diarrhea, and cold indicate Yang has reached collapse, though Yin abundance may not yet be extreme. Sini Tang overcomes Yin and restores Yang.

For diarrhea with undigested food, interior Cold with exterior Heat, sweating, and cold extremities, Tongmai Sini Tang (Pulse-Restoring Four Reversal Decoction) is used. Diarrhea with interior Cold plus exterior heat suggests simultaneous interior/exterior involvement. In Yang-deficient patients, exterior symptoms still cause sweating and cold extremities; using exterior-releasing drugs immediately causes Yang collapse. Not using them leaves exterior pathogens unresolved. Adding Scallion (*Cong*) to Sini Tang treats this meticulously, setting a standard for eternity.

For vomiting with weak pulse, free urination, slight body heat, and cold extremities, the prognosis is poor, treated with Sini Tang (Four Reversal Decoction). Vomiting and slight heat suggest exterior syndrome, but weak pulse rules out strong exterior pathogen; free urination rules out strong interior pathogen. Thus, vomiting is due to Yin pathogen attacking upward, and heat is Yang dissipating externally. Cold extremities show Yang covered by Yin, a critical state requiring Sini Tang. "Poor prognosis" echoes the previous case, emphasizing caution. Vomiting with slight heat differs significantly from interior Cold/exterior Heat; using Sini Tang without Scallion (*Cong*) prevents accelerating Yang flight. Students must study this deeply.

Four Death Syndromes of Jueyin
Cold damage on days 6-7 with faint pulse, cold extremities, and restlessness, treated with Jueyin moxibustion, results in death if reversal cold does not improve. Moxibustion opens Yang; failure to improve indicates Yang will not return.
Cold damage with fever, diarrhea, reversal cold, and agitation preventing sleep indicates death. Kidney governs agitation; inability to sleep due to agitation shows Kidney Yang escaping/perishing.
Fever with reversal cold lasting seven days, accompanied by diarrhea, is difficult to treat. Fever then cold indicates pathogen progression. Seven days of cold suggests hope for Yang recovery. Added diarrhea indicates deep-seated deficiency-Cold; Yang cannot recover, and Yin faces immediate extinction.
Cold damage without diarrhea for 6-7 days, suddenly developing fever, diarrhea, and unceasing sweating indicates death due to "Yin present, Yang absent." Fever with diarrhea shows interior deficiency allowing exterior pathogen inward ("Yin present"). Unceasing sweating shows exterior deficiency allowing internal Yang to escape ("Yang absent"). In Shaoyin, Kidney stores True Yang; death results solely from True Yang loss. In Jueyin, death results from unreversed reversal cold and persistent diarrhea causing prolonged escape of Kidney True Yang. Is Kidney True Yang not the root of life? This clarifies the intent of the *Zubing Lun*.