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In the pathogenesis of Cold Damage (Shanghan), when the pathogenic factor invades the Three Yang meridians, the Taiyang (Greater Yang) meridian is the primary site; when it invades the Three Yin meridians, the Shaoyin (Lesser Yin) meridian is the primary site. Although the Shaoyin meridian is located between the Taiyin and Jueyin meridians, it actually serves as the exterior aspect of the Yin meridians. This is because it shares an interior-exterior relationship with the Taiyang meridian and is connected to the Yin Linking Vessel (Yin Wei Mai). Furthermore, human Kidney Qi is often deficient, making one most susceptible to disease in this area. Moreover, the etiology is diverse. People generally only know that Shaoyin disease involves transmission from other meridians or direct invasion, along with methods to save Yin and restore Yang. They do not realize that although direct invasion requires restoring Yang, there are distinctions between methods involving sweating and those involving warming. Although transmission usually calls for saving Yin, there are differences between supporting healthy Qi and attacking pathogenic factors. How can one confuse these indiscriminately without causing confusion to the reader? Generally, heat pathogens transmitted via meridians first damage the Yin within the meridians. In severe cases, the pathogen remains while Yin fluids are exhausted. Specifically regarding transmission to the Shaoyin meridian, cases requiring urgent purgation account for three-tenths, while cases requiring urgent warming account for seven-tenths. Among those suitable for warming, there are further differences in sequence and priority. A slight error at the beginning can lead to a thousand-mile difference in outcome. Unskilled physicians fail to understand this; they dare to use warming methods only when they encounter cases involving prior sexual exhaustion, yet they hesitate to use them in all other cases where warming is indicated. They fail to realize that individuals who had previously labored and damaged their Kidney Water before falling ill cannot simply be assumed to require warming treatment. Warming is necessary only if the person’s True Yang within the Kidneys was originally deficient, and subsequently, after sweating or purging therapies, the Yang was disturbed and moved outward, unable to return inward. Only by employing warming medicines to restore Yang can life be saved. Therefore, among Cold Damage conditions, Yang collapse (Wang Yang) is most common. Even in the Taiyang stage, various critical signs exist. When the disease transmits to the Shaoyin, Zhang Zhongjing often hesitates during differentiation, reluctant to adopt standard treatments that clear heat and drain pathogens to preserve Yin as the primary task. Here, I organize the conditions of direct injury to the Yin meridians, as well as those where excessive sweating or purging has damaged Yuan Qi, requiring the expedient use of meridian-warming methods, into the Upper Compilation. The standard treatments for preserving Yin are organized into the Lower Compilation. Conditions of Warm-Heat diseases originating in the Shaoyin will be treated in a separate chapter, ensuring clear distinctions and orderly classification.

The pulse of Shaoyin disease is fine and faint, accompanied by a desire to sleep.
This describes the general pulse and syndrome of Shaoyin disease. Shaoyin belongs to Water and governs stillness. Even if a heat pathogen transmits to this meridian, the initial pulse, though slippery and large, must transform into a fine and faint pulse. Similarly, the initial symptoms, though restless and hot, must transform into drowsiness and lethargy. However, unlike normal drowsiness, the patient cannot rest comfortably. This applies especially to cold syndromes contracted directly by the Shaoyin meridian. One must look for initial exterior signs. If, after five or six days, the pulse becomes fine, deep, and rapid, with dry mouth and inability to lie down, it indicates a heat syndrome. If, from the onset, the pulse is faint and fine, the mouth feels moist, and there is a desire to sleep, it indicates a cold syndrome. Clear differentiation based on these criteria ensures no errors. The reason for the desire to sleep lies in the movement of Defensive Qi (Wei Qi): when it circulates in the Yang aspects, one is awake; when it circulates in the Yin aspects, one sleeps.

In Shaoyin disease, if fever appears upon initial onset despite a deep pulse, Mahuang Fuzi Xixin Tang (Ephedra, Aconite, and Asarum Decoction) is indicated.
A deep pulse with fever indicates Shaoyin complicated by Taiyang exterior pathogens, requiring dispersal. This is distinct from the condition occurring four or five days into Shaoyin disease, where extreme Yin repels Yang, causing True Yang to surface. The method for treating the exterior of the Three Yin meridians differs significantly from that of the Three Yang. For the Three Yin, warming the meridians is the foundation for releasing the exterior, particularly crucial for Shaoyin. Thus, combining Mahuang (Ephedrae Herba) with Fuzi (Aconiti Lateralis Radix Praeparata) allows the exterior pathogen to exit while preventing True Yang from escaping. This constitutes the proper exterior-releasing method for Shaoyin.

For Shaoyin disease presenting on the second or third day, Mahuang Fuzi Gancao Tang (Ephedra, Aconite, and Licorice Decoction) should be used to induce mild sweating. This is because there are no interior syndromes at this stage.
On the second or third day of illness, in the absence of vomiting, diarrhea, restlessness, or thirst (interior signs), the pathogen should undoubtedly be resolved from the exterior. However, Shaoyin disease generally prohibits sweating methods, as sweating leads to Yang collapse. This specific case—characterized by external fever, absence of sweat, and internally free of vomiting, diarrhea, restlessness, or thirst—allows for warming the meridians and dispelling cold to induce a mild, lingering sweat. This principle is subtle. In Taiyang disease, there is the formula Guizhi Jia Fuzi Tang (Cinnamon Twig Decoction plus Aconite), but no formula combining Mahuang with Aconite. Taiyang disease does not present with a faint pulse and aversion to cold, so Aconite is unnecessary initially. Once a faint pulse, aversion to cold, vomiting, diarrhea, and restlessness appear, indicating imminent Yang collapse, Mahuang should not be used. From this, we infer that using Mahuang to treat Yin-cold Jue (reversal) conditions would be fatal.

In Shaoyin disease, if the mouth feels neutral (not bitter or dry) and there is aversion to cold in the back upon onset (one or two days), moxibustion should be applied, and Fuzi Tang (Aconite Decoction) administered.
A "neutral" mouth indicates no thirst or restlessness, ruling out exterior heat. The back is the pathway of the Du Meridian, governing the ascent of Yang Qi throughout the body. Aversion to cold specifically in the back, where Yang Qi does not readily reach, reveals the mechanism of deficient Yang and excess Yin. Moxibustion aids Yang and dissipates Yin, while Fuzi Tang warms the meridians and dispels cold. Critics might argue that early-stage Cold Damage presents lightly, warranting no alarm. However, Zhang Zhongjing emphasizes treating early signs of Yang deficiency and Yin excess to prevent progression. Waiting until the fourth or fifth day allows Yin cold to become extreme and irreversible. Note: Direct cold contraction in Shaoyin presents either with initial fever and deep pulse, or with immediate transition from Taiyang without generating stagnant heat. Though seemingly similar, they differ greatly. In the former, only the Yin meridian is affected, leaving Taiyang intact; thus, despite a deep pulse, fever persists, and interior signs like diarrhea or reversal cold are absent, indicating reliance on the Taiyang exterior barrier. In the latter, Taiyang exterior Qi is severely deficient, allowing pathogens to invade Shaoyin directly; thus, aversion to cold persists without fever. This state of dual deficiency is more critical than simultaneous exterior-interior involvement (Liang Gan). While Liang Gan involves heat treatable by releasing exterior and draining interior, this condition involves internal and external cold-deficiency, requiring urgent warming and tonification, supplemented by moxibustion at Guanyuan (CV 4). Though appearing less acute than fever with deep pulse, it is more dangerous. Delay or hesitation by unskilled physicians fearing strong warming herbs often leads to death.

In Shaoyin disease, if there is body pain, cold hands and feet, bone and joint pain, and a deep pulse, Fuzi Tang (Aconite Decoction) is indicated.
Pain throughout the body and joints typically indicates Taiyang disease. However, combined with cold extremities and a deep pulse, it confirms deficiency of True Yang in the Kidneys. Thus, the body and joint pain stem from Yang deficiency, unrelated to exterior pathogens. Fuzi Tang assists Yang to overcome Kidney cold, resolving the pain. Misidentifying this pain as exterior pathogenic would be lethal.

In Shaoyin disease, if the pulse is deep, urgent warming is required, preferably using Sini Tang (Frigid Extremities Decoction).
When exterior pathogens enter Shaoyin, they contend with Kidney Qi. A deep, non-pulsating pulse reflects the Neijing concept of "Kidney Qi sinking alone," indicating severe Yang deficiency. Urgent warming is needed to support Yang.

In Shaoyin disease with diarrhea, Baitong Tang (White Passages Decoction) is indicated.
Diarrhea without Yang signs indicates pure Yin. The urgency lies in preventing extreme Yin from blocking Yang. In Sini Tang, the moderating effect of Gancao (Glycyrrhizae Radix) is removed, and Congbai (Allii Tuberosi Bulbus) is added to Ganjiang (Zingiberis Rhizoma) and Fuzi to unblock Yang and dissipate Yin. Hence the name Baitong, signifying the unblocking power of Congbai.

In Shaoyin disease with diarrhea and a faint pulse, administer Baitong Tang. If diarrhea persists, leading to cold extremities, absent pulse, dry retching, and irritability, Bai Tong Jia Zhu Dan Huang Tang (Baitong Decoction plus Pig Bile and Human Excrement) is indicated. If the pulse suddenly emerges after administration, death ensues; if it slowly returns, survival occurs.
If symptoms worsen to cold extremities, absent pulse, dry retching, and irritability after taking Baitong Tang, it is not due to the medicine's ineffectiveness but lack of guidance for the medicinal energy to penetrate. Therefore, Yin-substances like Ren Shen Huang (Human Excrement) and Zhu Dan (Pig Bile) are added to guide the Yang-tonifying herbs deeper. Survival depends on the pulse returning gradually; sudden emergence indicates death. The difficulty of retaining floating Yang highlights the severity. Early use of Baitong Tang for diarrhea prevents deterioration, representing sound practice.

If Shaoyin disease persists for two to three days and progresses to four or five days with abdominal fullness, difficult urination, heavy/painful limbs, and spontaneous diarrhea, water retention is present. Depending on accompanying symptoms such as cough, frequent urination, diarrhea, or vomiting, Zhenwu Tang (True Warrior Decoction) is indicated.
Excessive Yin cold causes water flooding. Yang deficiency fails to control water and generate Earth to restrain water, leading to abdominal pain, difficult urination, heavy/painful limbs, and diarrhea. Water floods everywhere. Just as Zhenwu controls northern waters, this formula stabilizes the condition. In the Taiyang chapter, Zhenwu Tang treats Yang collapse with tremors. Here, it addresses Shaoyin water-dampness reversing upward. Bladder (Yang organ) and Kidney (Yin organ) share the Northern Water position. Bladder pathogens (Yang) are treated with Mahuang (Qinglong Tang); Kidney pathogens (Yin) are treated with Fuzi (Zhenwu Tang). These formulas cleanse phlegm, guide water, dissipate Yin, and secure Yang. Regarding Zhenwu Tang, its primary function is treating internal water retention in Shaoyin via Baizhu (Atractylodis Macrocephalae Rhizoma), Fuzi, Fuling (Poria), and Shengjiang (Zingiberis Rhizoma Recens) to transport Spleen and leach dampness. The subtle use of Shaoyao (Paeoniae Radix Alba) is profound. Although termed Shaoyin disease, the root is internal water retention causing pain, diarrhea, heaviness, and paradoxical urinary difficulty. In extreme cold-deficiency, urine would be clear and uncontrollable; difficulty implies concurrent Yin deficiency or latent Yang pathogen. Shaoyao protects Yin against the harshness of Fuzi. Other formulas like Fuzi Tang and Guizhi Jia Fuzi Tang also combine Shaoyao and Fuzi to warm meridians and protect Ying, akin to preserving Yin and restoring Yang. Few later physicians grasp this nuance.

Modifications for Zhenwu Tang: Add Ban Sheng of Fuzi, 1 liang each of Xixin (Asari Radix) and Ganjiang for cough. Remove Fuling if urination is frequent. Remove Shaoyao and add 2 liang of Ganjiang for diarrhea. Remove Fuzi and add Shengjiang (totaling half jin) for vomiting. Removing Fuzi for vomiting is counterintuitive since water-cold reversing upward warrants Fuzi. This modification applies only if there is pre-existing heat/phlegm in Lung/Stomach causing habitual vomiting—an exceptional case. Contrast this with Tongmai Sini Tang, where ginger is added without removing Fuzi. Thus, using Zhenwu Tang for acute vomiting is already questionable; removing Fuzi is inappropriate.

In Shaoyin disease, if there is diarrhea with undigested food, interior cold with exterior heat, cold extremities, faint/almost imperceptible pulse, aversion to cold is absent, and the face is red, possibly with abdominal pain, dry retching, sore throat, or cessation of diarrhea with absent pulse, Tongmai Sini Tang (Pulse-Restoring Frigid Extremities Decoction) is indicated. Recovery occurs if the pulse returns.
Severe interior cold with diarrhea, yet exhibiting exterior heat, red face, absence of aversion to cold, cold extremities, and faint pulse, indicates Yin pathogens repelling Yang outward. In Sini Tang, double the amount of Ganjiang to strongly warm the interior. Following the logic of Baitong Tang, add Congbai to enter Yin, restore Yang, and revive the pulse. The previous text states sudden pulse emergence means death; here, prompt pulse return means recovery. Sudden emergence implies root separation; prompt return implies restoration. If pulse return is sluggish, Yang has scattered with heat, leading to death.

Modifications for Tongmai Sini Tang: Add 9 stalks of Congbai for red face. Remove Congbai and add 2 liang of Shaoyao for abdominal pain. Add 2 liang of Shengjiang for vomiting. Remove Shaoyao and add 1 liang of Jiegeng (Platycodonis Radix) for sore throat. Remove Jiegeng and add 2 liang of Renshen (Ginseng Radix) if diarrhea stops but pulse remains absent.
Red face indicates Yang repelled upward; Congbai unblocks Yang. Abdominal pain indicates insufficient True Yin; removing Congbai avoids aiding Yang excessively, adding Shaoyao to gather Yin. Sore throat indicates Yin knotting upward; removing Shaoyao avoids constraining Yin, adding Jiegeng to benefit the throat. Cessation of diarrhea with absent pulse indicates incomplete Yang recovery and blood deficiency; Renshen tonifies Qi and Blood. Jiegeng is removed to avoid ascending action obstructing circulation.

In Shaoyin disease, if there is vomiting and diarrhea, cold extremities, and severe restlessness bordering on death, Wuzhuyu Tang (Evodia Decoction) is indicated.
This represents Shaoyin complicated by Jueyin. Vomiting, diarrhea, cold extremities, and severe restlessness indicate rising Yin Qi of Kidney and Liver, approaching crisis. Wuzhuyu (Evodiae Fructus) descends rebellious Qi, while Renshen, Ganjiang, Dazao (Jujubae Fructus), and Ginger thicken Spleen Earth. This warms meridians and middle jiao, preventing Yin Qi from disturbing upward.

In Shaoyin disease, if vomiting and diarrhea are accompanied by restlessness and cold extremities, the prognosis is fatal.
Vomiting and diarrhea leading to restlessness indicate chaotic and exhausted Yin-Yang. Combined with cold extremities, the central Earth collapses, cutting off connection between upper and lower, resulting in death. Early warming of the middle jiao could have prevented this. Note: The previous case described similar symptoms but was treatable with Wuzhuyu Tang. Why is this fatal? Because applying warming methods here exacerbates restlessness, signaling impending death.

In Shaoyin disease, if food is vomited immediately upon entry, there is a sensation of wanting to vomit but inability to do so, initial cold extremities, and string-tight/slow pulse, this indicates excess in the chest; purgation is contraindicated, vomiting induction is appropriate. If dry retching is caused by cold-fluid above the diaphragm, vomiting induction is contraindicated; urgent warming with Sini Tang is required.
Immediate vomiting suggests stomach rejection. Inability to vomit when not eating indicates rebellious Yin Qi. Initial cold extremities and string-tight/slow pulse rule out transmitted heat. While Yin pathogens present this way, phlegm-fluid also shows this pulse. If gastric phlegm-excess were suspected, emesis would be indicated. However, the inability to vomit points clearly to Yin rebellion. Even if dry retching stems from cold-fluid above the diaphragm, it is Yin pathology, unsuitable for typical phlegm-resolving drugs. Emesis would worsen the condition. Urgent warming supports Yang to overcome Yin, dispersing cold-fluid effectively.

In Shaoyin disease, if there is desire to vomit but inability to do so, irritability, and desire to sleep, progressing after five to six days to spontaneous diarrhea and thirst, it belongs to Shaoyin. Thirst arises from deficiency prompting self-rescue with water. If urine is white, Shaoyin syndrome characteristics are complete. White urine indicates lower-jiao deficiency-cold failing to control water.
Desire to vomit without emission and irritability signal Kidney Qi rebellion. Spontaneous diarrhea with thirst and dry mouth mimics heat. However, Kidney heat causes yellow/red urine. White urine confirms lower-jiao deficiency-cold, requiring warming, not cold-purgatives. Subsequent cases describe deteriorated Shaoyin deficiency-cold syndromes where Zhang Zhongjing provides no formulas due to dual Yin-Yang injury and blood-Qi exhaustion, leading to high mortality.

If a patient’s pulse is tight in both Cun and Chi positions but sweats, it indicates Yang collapse, belonging to Shaoyin. Symptoms include sore throat, vomiting, and diarrhea.
Tight pulse is typical of Cold Damage, which usually lacks sweating. Sweating indicates failure of Yang to secure the exterior, allowing pathogen retention and sweat release. Shaoyin pathogens, if retained, cause sore throat, vomiting, and diarrhea. Treatment follows Shaoyin warming and cold-dispelling principles.

In Shaoyin disease, if the pulse is faint, sweating is contraindicated as it causes Yang collapse. If Yang is deficient and the Chi pulse is choppy, purgation is contraindicated.
Yang collapse precludes sweating. "Wang" (collapse) equates to "Wu" (absence). Absence of Yang implies Yin pathogen, which might suggest purgation. However, with deficient Yang and weak/choppy Chi pulse, purgation is forbidden. Urgent warming is indicated.

If there is cold extremities with a tight pulse, sweating is contraindicated. Sweating causes voice disorder, hoarseness, tongue flaccidity, and inability to speak.
Shaoyin collaterals enter the Lung, traverse the throat, and attach to the tongue base. Lung deficiency leads to weak collateral manifestations: voice disorder, hoarseness, tongue flaccidity, and speech impairment.

The preceding four items are deficient-cold deteriorated Shaoyin conditions. Though Zhang Zhongjing offers no formulas, they are treatable. Specific recommendations: "Desire to vomit" case → Zhenwu Tang; "Pulse tight" case → Fuzi Tang plus Jiegeng and Chishizhi; "Faint pulse" case → Baitong Tang plus Ren Shen Huang and Zhu Dan; "Cold extremities with tight pulse" → Sini Tang. Mistaken sweating leads to irreversible speech/tongue issues.

In Shaoyin disease, if the pulse is faint, fine, and deep, with desire to sleep, sweating, absence of irritability, and desire to vomit, progressing after five to six days to spontaneous diarrhea, restlessness, and insomnia, the prognosis is fatal.
Faint, fine, deep pulse and somnolence are fundamental Shaoyin signs. Sweating without irritability eliminates Yang signs, shifting focus to Yin. The presence of desire to vomit indicates rebellious Yin, requiring urgent warming. Failure to act leads to worsening diarrhea, restlessness, and insomnia. This signifies disturbance of True Yang in the Kidney, scattering instantly. Even warming would be too late. The shift from non-irritability to irritability, and from somnolence to insomnia, indicates the last thread of Yang is disrupted beyond recovery.

In Shaoyin disease, if there is aversion to cold, curling up, diarrhea, and cold extremities, the condition is untreatable.
With extreme Yin and absent Yang, even Sini Tang may fail to restore Yang from nothingness. Hence, "untreatable."

In Shaoyin disease, if there are cold extremities, aversion to cold, body heat, absent pulse, and irritability without restlessness, the prognosis is fatal.
Absent pulse indicates premature Yang extinction. Irritability without restlessness signals instantaneous exhaustion of solitary Yin.

In Shaoyin disease, if diarrhea ceases but dizziness and occasional vertigo occur, the prognosis is fatal.
Cessation of diarrhea suggests potential recovery. However, dizziness and vertigo indicate collapsing Yang.

In Shaoyin disease, if there is vomiting and diarrhea, but extremities are not cold, and there is fever, survival is possible. If the pulse is absent, apply moxibustion to Shaoyin points seven times.
Absence of cold extremities and presence of fever suggest Yin transforming back to Yang. However, persistent vomiting/diarrhea with absent pulse suggests floating Yang. Moxibustion on Shaoyin points guides Yang inward, restoring pulse and stopping symptoms. Previous cases involved aversion to cold requiring Zhenwu Tang post-moxibustion due to internal Yin-cold coagulation. This case involves internal Yin/external Yang, so moxibustion alone suffices to draw Yang inward without additional warming herbs.

These constitute Shaoyin deficiency-cold syndromes.

In Shaoyin disease, if there is aversion to cold, curling up, occasional self-arising irritability, and desire to remove clothing/blankets, the condition is treatable.
Self-arising irritability and desire to uncover indicate disturbed True Yang, not yet fully escaped. Warming methods are applicable. Prognosis is favorable only if irritability subsides quickly, spirit remains calm, extremities warm, and pulse is faint/deep but continuous. Agitation, cold extremities, and rapid/scattered pulse indicate death.

In Shaoyin disease, if diarrhea stops, accompanied by aversion to cold, curling up, but warm extremities, the condition is treatable.
Aversion to cold and curling up indicate deficiency-cold. Cessation of diarrhea and warm extremities suggest gradual Yang recovery and Yin-cold dissipation. Warming aids Yang restoration.

In Shaoyin disease, if the pulse is tight, progressing to the seventh or eighth day with spontaneous diarrhea, sudden pulse softening, warm extremities, and disappearance of tightness, resolution is indicated. Despite irritability and diarrhea, self-healing is expected.
Initial tight pulse softens as Yin-cold exits downward via diarrhea. Warm extremities indicate Yang recovery. Self-healing occurs despite irritability. These cases represent pathogen resolution and cold retreat, requiring no medication.

In Shaoyin Wind-Strike, if the pulse is superficially faint and deeply floating, recovery is indicated.