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Dai: In treating cold damage (Shanghan), one must distinguish between Yin and Yang syndromes to avoid misdiagnosis. There are three Yang meridians: Taiyang, Yangming, and Shaoyang. There are also three Yin meridians: Taiyin, Shaoyin, and Jueyin. The Yin-Yang of the meridians refers to Zang-Fu organs: Fu organs are Yang, including the Bladder, Stomach, and Gallbladder; Zang organs are Yin, including the Spleen, Kidney, and Liver. The Yin-Yang of diseases refers to the nature of external pathogens, i.e., Yin Qi and Yang Qi.

When disease is in the Taiyang meridian, heat is at the skin level, manifesting as "Xi Xi" fever (a warm sensation like feathers covering) or "Fu Fu" fever (stagnant heat), accompanied by headache, aversion to cold, and body ache. The pulse will be floating and tight.
When disease is in the Yangming meridian, heat is at the muscle level, manifesting as high fever ("Zhuang Re"), steaming heat ("Zheng Zheng Re"), accompanied by forehead pain, tidal fever ("Chao Re"), or spontaneous sweating ("Zi Han"). The pulse will be long and rapid.
When disease is in the Shaoyang meridian, it is a half-exterior, half-interior heat syndrome, manifesting as alternating chills and fever ("Wang Lai Han Re"), accompanied by pain at the temples, bitter taste in the mouth, vomiting, chest fullness, and hypochondriac pain. The pulse will wiry and rapid.
When disease is in the Taiyin meridian, the hands and feet gradually become cold, the pulse becomes gradual and sunken, or there is spontaneous diarrhea, abdominal fullness, vomiting, and no thirst.
When disease is in the Shaoyin meridian, although fever may occur, the hands and feet are naturally cold, and the pulse is sunken and fine.
When disease is in the Jueyin meridian, the hands and feet are cold ("Jue Leng"), the pulse is faint and slow, and in severe cases, lips turn blue, the tongue curls, and the testicles retract.

Yang syndrome manifestations: The face is red and radiant, lips are red, the mouth and tongue are dry, and the patient can drink fluids. The body is light and easy to move, often wanting to open eyes and see people, with clear and bright eyes. The patient likes to speak, voice is loud. Breath from nose and mouth is smooth. Urine may be red or yellow, stool may be constipated or hard, hands and feet are naturally warm, and nails are red and vibrant.

Yin syndrome manifestations: The face is cyanotic or black, or there is floating false Yang causing a red complexion that is not vibrant or radiant. The body is heavy and difficult to turn, preferring to lie facing the wall, curled up, drowsy, or keeping eyes closed avoiding people. Eyes are dim, speech is lazy and low. Breath is difficult to distribute, unable to inhale/exhale smoothly, breath from mouth/nose is cold, no desire to drink. Face fears cold as if scraped by a knife. Lips may be cyanotic or purple, tongue color may be cyanotic, purple, or white, coated with slippery moss, lacking redness. Hands and feet are naturally cold, nails may be cyanotic or purple, blood is not vibrant. Urine is clear and white, or pale yellow, stool is loose or diarrheal. Even if the skin surface feels hot, pressing reveals little heat; in extreme Yin cold, the cold penetrates through to the hand.

Both Yin and Yang Qi can invade Zang-Fu organs. Thus, when Yang Qi invades the Taiyang meridian, it is Wind Strike (Shang Feng), characterized by aversion to wind and sweating. When Yin Qi invades the Taiyang meridian, it is Cold Damage (Shang Han), characterized by aversion to cold and no sweating. If unresolved in Taiyang and transferring to Yangming and Shaoyang, it becomes purely Yang syndrome, which is not as easy to treat as Taiyang. If Yang Qi continues to transmit into Yin meridians, it becomes "Yang within Yin." Although symptoms like spontaneous diarrhea, drowsiness, blue lips, cold limbs, curled tongue, and retracted testicles appear, one must not rashly administer hot medicines; instead, one should purge the Yang pathogen residing in the Yin meridians. If purgation was excessive for a Yang disease, leading to Yang Qi depletion, it transforms into a Yin syndrome, described as "heat harm not yet resolved, cold disease arises again," or initial presentation is Yin syndrome, known as "Yin within Yin." This occurs because Yin Qi attacks Yin meridians, transmitting internally rather than from Yang meridians. One should only use warm medicines to restore Yang Qi. Therefore, when Yang enters Yin, transform Yang to save Yin; when Yin enters Yang, use Yang to save Yang. These two must be distinguished.

Huoren Shu adds: Taiyang, Yangming, and Shaoyang all belong to Yang syndromes.
Taiyang is the Bladder meridian, with symptoms of fever, aversion to cold, headache, lower back pain, and floating pulse.
Yangming is the Stomach meridian, with no aversion to cold but aversion to heat, sweating, constipation, tidal fever, and long pulse.
Shaoyang is the Gallbladder meridian, with bitter taste, dry throat, hypochondriac fullness, fever with vomiting, or alternating chills and fever, and wiry pulse.
Mahuang Tang (Ephedra Decoction), Da Qing Long Tang (Great Blue Dragon Decoction), and Guizhi Tang (Cinnamon Twig Decoction) treat Taiyang Wind Strike and Cold Damage.
Da Chai Hu Tang (Major Bupleurum Decoction), Tiao Wei Cheng Qi Tang (Regulate the Stomach and Direct Downward Decoction), Xiao Cheng Qi Tang (Minor Direct Downward Decoction), and Da Cheng Qi Tang (Major Direct Downward Decoction) treat Yangming Cold Damage.
Xiao Chai Hu Tang (Minor Bupleurum Decoction) treats Shaoyang Cold Damage. (Note: Text says "Shaoyin", but context implies Shaoyang). Other formulas treat post-sweating, post-emetic, or post-purgative conditions.

If Yang Qi is exclusively abundant and Yin Qi abruptly perishes, it is Yang Du (Yang Toxin). Symptoms include restlessness, manic walking, delirious speech, red face, sore throat, skin spots like brocade, or bloody diarrhea, with洪 (Flooding) or slippery-rapid pulse. Administer sour and bitter medicines to restore Yin Qi and resolve via profuse sweating. Ancients said: "Sour and bitter induce vomiting and purging, belonging to Yin," referring to herbs like Kushen (Sophora Root), Daqing (Indigo Naturalis), Tingli (Descurainia Seed), and Kujiu (Vinegar), which restore Yin Qi. Use bitter mildly, or combine sour and bitter severely to reduce heat and restore Yin. If heat extremity causes Jue (cold limbs), where Yang syndrome mimics Yin, scholars must differentiate by pulse.

Taiyin, Shaoyin, and Jueyin all belong to Yin syndromes.
What is Taiyin syndrome? Taiyin is the Spleen meridian, governing chest/diaphragm distension.
What is Shaoyin syndrome? Shaoyin is the Kidney meridian, governing fine pulse, vexation, desire to sleep, or spontaneous diarrhea with thirst.
What is Jueyin syndrome? Jueyin is the Liver meridian, governing thirst, Qi rushing to the heart, heart pain, muscle heat, anorexia, vomiting worms after eating, and persistent diarrhea after purgation.
For mild cold in the Three Yin meridians, use Lizhong Tang (Regulate the Middle Decoction); for slight cold limbs or cold-damage diarrhea, use Ganjiang Gancao Tang (Dried Ginger and Licorice Decoction); for severe cases, use Sini Tang (Frigid Extremities Decoction); for absent pulse, use Tongmai Sini Tang (Pulse-Resuscitating Frigid Extremities Decoction).
If Yin Qi is exclusively abundant and Yang Qi abruptly perishes, it is Yin Du (Yin Toxin). Symptoms include cold limbs, severe umbilical/abdominal pain, body feeling like being beaten, sinking疾 (rapid) pulse, vomiting, or diarrhea. Urgently moxa below the navel and administer acrid-hot medicines to restore Yang Qi and resolve via profuse sweating. Ancients said: "Acrid and sweet disperse and ascend, belonging to Yang," referring to Guizhi (Cinnamon Twig), Gancao (Licorice), Ganjiang (Dried Ginger), and Fuzi (Aconite Root), which restore Yang Qi. Use acrid-sweet mildly, or combine acrid-bitter severely. If Yin extremity causes restlessness, where Yin syndrome mimics Yang, scholars must differentiate by pulse.

Luo: Differentiation of Yin and Yang syndromes. The eldest son of Li, Controller of Jingjiang Prefecture, aged 19, contracted cold damage in April. After nine days, a physician treated him as Yin syndrome, administering Fuzi Lizhong Wan (Aconite Regulate the Middle Pills) several times, worsening his condition. Another physician argued for Yang syndrome. Conflicted, he did not take medicine. I was invited to examine him. To avoid speaking directly in front of others, I explained the details for them to deduce.
Yang syndrome: High body heat without cold limbs, restless lying down but strong rising, no aversion to cold but aversion to heat, no vomiting/diarrhea, thirst with drinking, restlessness insomnia, ability to eat and talk much, floating-large-rapid pulse.
Yin syndrome: No body heat, cold limbs, aversion to cold, curled lying, aversion to human voices, pulling clothes to cover, no vexation/thirst, no eating/drinking, free urination, loose stools, sinking-fine-micro-slow pulse.
His pulse was 6-7 beats per respiration. His mother said he cried out all night, slept none, and desired water. Knowing Yang syndrome signs were complete and he had no bowel movement for three days, I ordered urgent purgation. I used wine-wrapped Dahuang (Rhubarb Root) 6 qian, roasted Gancao (Licorice Root) 2 qian, and Mangxiao (Mirabilite) 5 qian, decocted and administered. By evening, he passed several motions of dry feces, over twenty pieces. That night, profuse sweating occurred. Next day, body cool, pulse calm.
Reflecting on Suwen's "Treat each organ/meridian," Zhang Zhongjing stated Six Meridians have different transmissions. Huoren Shu states: First clarify meridians. Ignorant physicians ignore meridians and pathology, guessing blindly, causing disaster. As Han Yu said, doctors fail due to lack of deep thought. Scholars should reflect.

Wu: Yin syndrome mimicking Yang is like Water Extreme mimicking Fire. Due to transmission errors and rapid cooling/purging, a patient with inherent Kidney Qi deficiency/cold develops Yin syndrome. Internal cold forces floating Yang fire outward. Symptoms: red face, restlessness, slight fever, thirst but inability to drink, constipation, pale yellow urine, vomiting, shortness of breath, dysarthria, sore throat. This mimics Yang syndrome. If mistaken for Yang and treated with cold/bitter drugs, death ensues quickly. For sinking-fine-slow-micro pulses, urgently use Tongmai Sini Tang with extra Renshen (Ginseng Root) and Fuzi (Aconite Root) to reconnect True Yang. Delay leads to Yin excess/Yang decline, unrescuable even by Ginseng/Aconite. This is Yin Excess Blocking Yang. Wang Taipu noted: Body heat, rapid pulse, but non-beating upon pressure indicates Yin Excess Blocking Yang, not Heat.

Lou: Suwen states: Pulse follows but disease reverses. Signs mimic Yang, pulse mimics Yang, but disease is Cold. Signs mimic Yin, pulse mimics Yin, but disease is Heat. Thus, treat contrary to signs/pulse. E.g., fever, slight heat, restlessness, red face, but sinking-micro pulse indicates Yin syndrome mimicking Yang. Fever is due to interior cold; restlessness due to Yin excess; facial redness (floating Yang) due to lower deficiency. Misinterpreting as excess heat and giving cold drugs dissipates Qi and causes major illness. Waitai Miyao states: Yin excess causing restlessness is called Yin Restlessness, desiring to sit in a well, treat with hot drugs. Thus, Zhang Zhongjing uses Sini Tang plus Congbai (Scallion White) for Shaoyang syndrome with red face. (Yuan: Cold drugs cause internal fire to rise due to water interaction, reaching Yin restlessness extremity, desiring well water. This is prior Yang loss. Physicians mistaking this for heat and giving more cold drugs ensure death.)

Yuan: Restlessness after vomiting/coughing, steaming body heat like sitting in a steamer, wanting to remove clothes/stay cold, drinking cold water doesn't help, returning chills, short rapid breath, chest oppression nearing death, wide-open eyes, loud voice, excessive tears/saliva/phlegm. Restlessness lasts briefly. Pulses are fine-wiry-choppy, empty upon pressure. This is Major Cold. Treat with acrid-cold and sweet-warm agents to strongly drain South (Fire) and North (Water). Feng Neihan's nephew had cold damage, red eyes, vexation/thirst, pulse 7 beats, non-beating upon pressure. Classics say: Pulse follows but non-beating upon pressure applies to all Yang. This is Yin Excess Blocking Yang externally, not Heat. Given Ginger/Aconite agents, cured via sweating.

Xu: Cold damage 6-7 days, no fever, sinking-tight-fine pulse, restlessness, no desire to drink. This is Yin Excess Blocking Yang. Use Fuzi Pili San (Aconite Thunderbolt Powder). Do not give to those desiring water.

Wu: Yang syndrome mimicking Yin is like Fire Extreme mimicking Water. Severe heat in cold damage, missed sweating/purgation, Yang Qi hyperactive and depressed internally, manifests as overcoming transformation externally. Symptoms: cold limbs, dull spirit, resembling Yin syndrome. However, dry lips/tongue, desire to drink, constipation/hard stool, red/scanty urine. Loose watery stool indicates dry feces accumulation internally (paradoxical diarrhea), not cold diarrhea. Foul flatus confirms this. Pulse is sinking but slippery-strong upon pressure, or intermittent heat aversion to covers, throwing limbs, forceful delirium. This is Yang syndrome. Mild cases: Ren Shen Bai Hu Tang (Ginseng White Tiger Decoction) or Xiao Chai Hu Tang combined with Jie Du Tang (Detoxification Decoction). Interior excess requires purgation: Tiao Wei Cheng Qi Tang. With tidal fever: Da Chai Hu Tang plus Mangxiao. Severe excess/blockage: Da Cheng Qi Tang. Judge severity carefully. This is similar to Yang Excess Rejecting Yin. Wang Taipu noted: Cold limbs, slippery-rapid pulse beating strongly under finger indicates Yang Excess Rejecting Yin, not Cold.

Huoren Shu adds: Cold limbs, constipation, red urine, or black stool, sinking-slippery pulse indicates Yang syndrome mimicking Yin. Mild: Bai Hu Tang. Severe: Cheng Qi Tang. Missed purgation in cold damage causes Qi/Blood blockage, cold limbs. Deep latent heat causes deep Jue. Urgently use Da Cheng Qi Tang plus Nifen (Calomel) to purge, curing via sweat. Heat Jue differs from Yin Jue. Heat Jue has slight cold limbs then fever; Yin Jue has no fever, cold limbs, aversion to cold, sinking-fine pulse, loose stool/urine. Previous sections discussed signs mimicking Yang but pulse/pathology Yin, and vice versa, thus treating contrary to signs. World distinguishes sign-mimic-Yang/pulse-Yin easily, but misses pulse-signs-Yin/pathology-Yang, causing many deaths. Xu Xueshi recounted Song Di's nephew with cold damage, vexation/thirst/sweating, treated with cold drugs, becoming Yin Toxin, dying in days. Song Di wrote "Yin Toxin Syndrome Resolution" to warn the world.

Commentary: Yin excess causes exterior cold, Yang deficiency causes exterior cold. Exterior syndrome: Sweat to cure. Yang excess causes interior heat, Yin deficiency causes interior heat. Interior syndrome: Purge to cure.

Zhao: Huoren Shu Q33 cites Suwen: Yang deficiency/exterior cold, Yin deficiency/interior heat, Yang excess/interior heat, Yin excess/exterior cold. Thus, Yang deficiency/Yin excess: Sweat cures, purge kills. Yin deficiency/Yang excess: Purge cures, sweat kills. Yin-Yang deficiency/excess does not refer to Cun/Cun positions. Nanjing says Yin-Yang deficiency/excess refers to pulse. Suwen says it refers to Exterior/Interior. Zhang Zhongjing cited Suwen's Exterior/Interior for cold damage sweating/purging, aligning with Waitai. Waitai: Exterior disease/Interior harmony: Sweat cures. Exterior harmony/Interior disease: Purge cures. I detail: Suwen's four Yin-Yang deficiency/excess syndromes refer to miscellaneous diseases. Nanjing Ch. 6 refers to pulse. Waitai refers to cold damage Exterior/Interior. Zhang Zhongjing's meaning is profound. Classics: Pathogen excess is Excess, Essence depletion is Deficiency. Primary Qi deficiency allows Pathogen invasion, creating Yin Deficiency/Yang Excess and Yang Deficiency/Yin Excess. Huoren Shung incorrectly merges Suwen's miscellaneous disease theory with Zhang's cold damage methods, changing Yang excess/interior heat to exterior heat, etc. My expansion: "Excess" refers to Pathogen, "Deficiency" refers to Primary Qi. It is the mechanism of Pathogen/Primary Qi fluctuation. Primary Qi: Yang governs Exterior, Yin governs Interior. Pathogen: Exterior is Yin, Interior is Yang. If True Yang of Exterior is deficient, Yin Pathogen invades and becomes excess. Exterior disease is Yang Deficiency. Floating-tight pulse indicates Yin Pathogen excess externally. This is Yang Deficiency/Yin Excess. Treat with Guizhi Tang (acrid-sweet-warm) to sweat, eliminating Yin Pathogen and warming True Yang. If True Yin of Interior is deficient, Yang Pathogen invades and becomes excess. Interior disease is Yin Deficiency. Sinking-solid pulse indicates Yang Pathogen excess internally. This is Yin Deficiency/Yang Excess. Treat with Cheng Qi Tang (sour-bitter-cold) to purge, eliminating Yang Pathogen and cooling True Yin. Otherwise, using Guizhi for Yang excess kills; using Cheng Qi for Yin excess kills. This is exacerbating excess and depleting deficiency. Zhang's intent is profound: Yang Deficiency/Yin Excess refers to Exterior syndrome; Yin Deficiency/Yang Excess refers to Interior syndrome. "Harmony" means no disease. Using "Harmony" to explain "Deficiency" is logically flawed.

Wang: Nanjing states: Cold damage Yang deficiency/Yin excess: Sweat cures, purge kills. Yang excess/Yin deficiency: Sweat kills, purge cures. Ah! This is the pivot of cold damage sweating/purging. Pathogen depth varies. Superficial: Exterior, closing pores, stagnant heat, aversion to cold/wind, headache. Treat with acrid-warm dispersal. Deep: Interior, dry feces, tidal fever, mania, delirium, thirst. Treat with salty-cold purgation. External Cold Pathogen is Yin Excess/Yang Deficiency. Internal Hot Pathogen is Yang Excess/Yin Deficiency. One error in sweat/purge determines life/death. Critics obscure this. Waitai Miyao states: Yin-Yang here refers to Body Exterior/Interior. Diseased is Deficient, Healthy is Excess. Exterior disease/Interior harmony is Yang Deficiency/Yin Excess. Exterior harmony/Interior disease is Yang Excess/Yin Deficiency. I argue: Balance is peace, deviation is disease. Excess is over, Deficiency is under. Can Excess be Harmony? Neijing says: Pathogen excess is Real, Essence loss is Empty. Saying Yang Deficiency needs sweat and Yin Deficiency needs purge ignores Pathogen and focuses on Primary Qi, which is confusing. Shanghan Weizhi states: Yin-Yang refers to Cun/Cun pulse positions. Large Chi (尺) / Short Cun (寸) is Yin Excess/Yang Deficiency, sweatable. Large Cun / Short Chi is Yang Excess/Yin Deficiency, purgable. If symptoms ready but pulse not matching, wait for pulse? This contradicts Yue Ren's question-answer logic focusing on disease, not pulse. Pulse diagnoses disease. If symptoms are urgent, waiting for pulse is confusing. Or ask: Zhang Zhongjing quotes this then says "Guizhi enters Yang excess dies; Cheng Qi enters Yin excess dies." Guizhi is Exterior, Cheng Qi is Interior. Mahuang Tang is also Exterior, why not mentioned? You say Yin Excess is Cold Pathogen, suitable for Mahuang, why cite Guizhi? Answer: Zhang says cold damage comes from Wind-Cold. Floating is Wind, Tight is Cold. Guizhi line mentions aversion to cold/wind. Mahuang line mentions aversion to wind. Wind and Cold are often linked. Is Wind Yang in freezing weather? No. Wind and Cold are both Yin Pathogens. Guizhi and Mahuang are both warm agents. Treating with warm agents shows both are Yin. Injury to Wei (Defensive) uses Guizhi; injury to Ying (Nutritive) uses Mahuang. Both are Exterior. Zhang's warning against sweat/purge error includes Mahuang when citing Guizhi. "Yang excess dies" means Exterior resolved, Interior full, purge only, no sweat. "Yin excess dies" means Interior not formed, Exterior present, sweat only, no purge. Thus, Yue Ren and Zhang Zhongjing's intent is clear.