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Mahuang Gen (Radix Ephedrae), Ouli (Ostreae Concha, prepared as powder), each 2 liang; Huangqi (Radix Astragali, honey-fried), Renshen (Radix Ginseng), each 2 liang; Longgu (Draconis Os, crushed); Digupi (Cortex Lycii), each 4 liang; Dazao (Fructus Jujubae), 7 pieces. Add 6 zhong of water, decoct to obtain 2.5 zhong, divide into six doses, drink all within one day.

Alternatively, for treating night sweats (Dao Han): Use Wubeizi (Fructus Terminaliae Chebulae) powder, mix with saliva to form a paste, fill the umbilicus, and bind firmly with silk cloth; this is most effective.

The "Three Xiao" diseases refer to Xiaoke (Xiao Re), Xiaozhong (Xiao Zhong), and Xiaoshen (Xiao Shen). Upper Xiao primarily involves the Lung (Fei), Middle Xiao primarily involves the Stomach (Wei), and Lower Xiao primarily involves the Kidney (Shen); thus it is called Xiaoke, caused by dryness. Dry Metal (Zao Jin) is further affected by Heat transformation, becoming dry and astringent. Dryness formed from stagnation occurs because Wind can dry out Dampness, and Heat consumes fluids. Xiaozhong refers to heat accumulation in the Stomach, characterized by good appetite but emaciation, severe dry-heat stagnation, excessive thirst and drinking, and polyuria. This is due to hyperactive Heart Fire (Xin Huo) and dry-heat scorching the Sanjiao (Triple Burner), preventing normal distribution and movement of fluids, so the body lacks moisture, resulting in emaciation, sallow complexion, and dark skin. Although there is excessive thirst and drinking, fluids cannot moisten outside the intestines and stomach, but instead flow downward causing polyuria. Laypeople misunderstand this, falsely diagnosing it as deficiency-cold of the Lower Jiao, misleading many. Xiaoshen refers to dry-heat induced Xiaoke, characterized by emaciation, dark complexion, turbid and dribbling urine with lipid-like fluid resembling paste. These three discussions are consistent with adult conditions. However, in children, there are additionally three types: Da Ke (Great Thirst), Re Ke (Heat Thirst), and Gan Ke (Gan Thirst). Da Ke arises after vomiting and diarrhea; damage to the Spleen and Stomach leads to fluid depletion, generating pathogenic heat, further depleting essence, causing dry lips and tongue and great thirst. Re Ke arises from excess blood and qi, representing dry-heat in the Zang-Fu organs. Another type results from summer-toxicity affecting the Stomach or dry-heat in hot Zang organs, where fluids are not generated, causing cracked lips and dry mouth, leading to Re Ke. Gan Ke results from preferring fatty foods and indulging in sweet and sour tastes, accompanied by bone-steaming night sweats, sallow emaciation, abdominal distension, bad breath, and dry lips; drinking heavily with unregulated urination. Prolonged illness may lead to carbuncles and sores, or transform into edema. Generally, prolonged Xiaoke with unregulated urition prevents essence from being distributed outward, depleting fluids further. Fluid depletion causes meridian stasis, impeding Ying and Wei circulation, leading to blood and qi stagnation, forming Gan disease. Accompanied by Spleen Earth deficiency, Kidney Water becomes excessive, counter-restricting Earth. Earth deficiency fails to transform dampness, generating heat; damp-heat binds, failing to transmit and transform, manifesting as skin edema and fullness. It is said: Thirst with incessant drinking and astringent urination leads to Pi (masses). Treatment methods include tonifying the Spleen to generate fluids (tonifying the Mother of Lung/Metal), or nourishing the Kidney to strengthen Water (protecting the Child of Lung/Metal), which is the fundamental principle for treating dry Metal. If eyelids become black and swollen, subcutaneous blue floats, shortness of breath like sawing, smoke/flame from throat, yellow/sunken whites of eyes, swollen/ulcerated lips, abdominal distension with wheezing, body swelling with floating purple-black spots, these are ominous signs. Patients with thirst must not induce sweating; even if external pathogens exist, treatment should be mild because the source of fluids is exhausted.

Thirst with excessive drinking is Upper Xiao, due to Lung Heat. Excessive eating and hunger is Middle Xiao, due to Stomach Heat. Thirst with frequent urination and uncontrollable turbid urine is Lower Xiao, due to Kidney Heat. All indicate Fire excess and Water deficiency. The Classics state: Heart transfers heat to the Lung, transmitting to Ge Xiao (Diaphragm Xiao). Also: Two Yangs knot, called Xiao. (Two Yangs refers to Yangming). Hand-Yangming Large Intestine governs Jin fluids; Xiao disease presents with yellow eyes and dry mouth, indicating Jin insufficiency. Foot-Yangming Stomach governs Blood; heat causes rapid digestion and hunger, indicating latent fire in Blood and Blood insufficiency. Those who have not yet transmitted but can eat will likely develop brain abscesses and sores; those who cannot eat will likely transmit to abdominal fullness and distension, both untreatable.

Generally, Blood disorders do not involve thirst/drinking, only Qi disorders do. Qi-type thirst prefers cold water, suitable for cold-draining diuretics to clear heat. Blood-type thirst prefers hot water, suitable for sweet-warm-astringent agents to nourish Yin. Upper is light, Middle is heavy, Lower is critical; if Upper and Middle are balanced, transmission to Lower is prevented. Thus, Kidney Xiao is a progression of Upper Xiao; Lung-Stomach heat enters the Kidney, consuming Kidney fat. Drinking one part, urinating two parts; urine like paste oil, drying the Kidney. The Lung governs Qi; when healthy, Qi controls fluids and essence, directing them upward to moisten the throat and nourish sinews, bones, vessels, and blood; the remainder becomes urine. When diseased, fluids lack Qi control, and essence flows down with urine like paste oil. Hejian discussed thirst only as Upper Jiao; does Middle/Lower Xiao have no thirst? Merely clarifying that Lower Xiao has turbid urine with lipids, treatment should nourish Yin to separate clear from turbid. Sweet-tasting urine in Kidney Xiao indicates severity; Water is born from Sweet but dies from Salty. Urine should be salty but is sweet, indicating leakage of vital energy, Spleen Qi sinking into Kidney, Earth overacting on Water.

Upper Xiao: Red cracks on tongue, great thirst craving drinks. *Ni Tiao Lun* states: Heart transfers heat to Lung, transmitting to Ge Xiao. Treat with Baihu Tang (White Tiger Decoction) plus Renshen. Middle Xiao: Good appetite but emaciation, spontaneous sweating, hard stool, frequent urination. Suhe states: Dry mouth craving drinks, eating much but hungry, deficiency-dampness forms Xiaozhong. Treat with Tiaowei Chengqi Tang (Regulate the Stomach and Direct Downward Decoction). Lower Xiao: Irritability, craving drinks, dry/scaly earlobes, urine like paste. Suhe states: Scorching irritability, water easily depleted, this is Kidney Xiao. Treat with Liuwei Wan (Six-Ingredient Pill with Rehmannia). Ancient methods for Three Xiao are thus. However, if Fire/Water are balanced and Qi/Blood nourished, how can Xiao occur? Improper care leads to Fire/Water imbalance, fluid exhaustion, Dragon-Lei Fire flaming upward. Long-term simmering consumes intestinal fat, dries five Zang organs, causing emaciated limbs and fatigue. Therefore, treating Xiao, regardless of upper/middle/lower, prioritizes the Kidney. Only Liuwei Wan, Bawei Wan (Eight-Ingredient Pill), and modified Bawei Wan, taken according to symptoms, lower Heart Fire and nourish Kidney Water, stopping thirst. Otherwise, organs burn, four Zang organs consume, Heart Fire self-immolates. Baihu and Chengqi are not appropriate. Lou Quanshan stated: Lung disease originates from Kidney deficiency; Kidney deficiency makes Heart fearless,妄行凌肺 (recklessly attacking Lung), causing Lung Xiao. Zhang Zhongjing treated thirst with excessive urination using Bawei Wan to tonify Kidney and save Lung, later named Kidney Xiao. Thus, thirst is due to fluid exhaustion from dryness. Dryness is extreme deficiency of True Yin causing deficient heat. Lower Xiao thirst is named Qiangzhong (Strong Middle), due to Kidney Water deficiency and Heart Fire hyperactivity.

*Jing* states: Large Intestine transfers heat to Stomach, good appetite but emaciation, called Shi Xiao (Food Xiao). Dongyuan stated: Good appetite but emaciation is due to latent fire in Stomach allowing eating, while Spleen deficiency causes muscle wasting. *Zonglu* stated: Cannot eat but thirsty indicates pre-transmission to abdominal fullness; can eat but thirsty indicates brain abscess/back carbuncle. Cannot eat is Spleen disease; Spleen irrigates surroundings and moves fluids with Stomach. Spleen/Stomach deficiency fails to distribute fluids, causing thirst. Even those who can eat are doing so due to Stomach deficiency seeking grain for self-rescue. Using cold-draining fire-clearing drugs like Baihu/Chengqi removes internal heat but generates middle cold, leading to drum-distension. Only Qiwei Baizhu San (Seven-Ingredient Atractylodes Macrocephala Powder), Renshen Shengmai San (Ginseng Pulse-Sustaining Decoction), drinking freely, followed by Bawei Dihuang Wan (Eight-Ingredient Rehmannia Pill) to nourish the source of transformation, is the correct method. Those who can eat, are thirsty, and develop sores suffer from rich people's diet of rich/greasy food. Frequent consumption of sweet/rich/fatty foods causes upper Qi overflow leading to Xiaoke. Do not take rich/greasy/herbal/mineral drugs; their fierce nature aids dry-heat. *Jing* states: Treat with Orchid (Lan) to eliminate stale accumulation; do not use cold drugs. Why carbuncles? *Jing* states: Changes from rich food often produce large Ding sores. For Kidney Xiao with brain/back carbuncles: Kidney governs bone, Brain is Sea of Marrow, Back is pathway of Taiyang Cold Water. Water dried, Sea exhausted, Yin Fire flares up, inevitably causing carbuncles. Severe non-ulcerating sores or red-water discharge, turning black/purple, indicate Fire extreme resembling Water, Kidney Water exhausted, untreatable. Bitterly strongly tonifying Yin might help if eating/stool/spirit are stable without other evil signs.

Xiaoke fundamentally stems from Heat, divided into internal/external and deficiency/excess. Transmission heat consuming fluids causing thirst, affecting Qi level, requires cold-draining diuretic agents to quickly clear heat; heat gone, Yin born. Stomach deficiency losing fluids, Yin deficiency causing thirst, affecting Blood level, requires sweet-warm-acrid-sour agents to nourish Yin; Yin born, dryness removed.

Question: Why does thirst persist after taking Dihuang Tang? Answer: This formula cannot abandon its rules. Heart/Lung are close, dosage should be small; Kidney/Liver are distant, dosage should be large. For high-position Middle Xiao, slow treatment with previous pills works. If Lower Xiao is extreme, great thirst/dryness, use 1 jin of modified Bawei Wan ingredients, add 1 liang Rougui (Cinnamon Bark), decoct in 6-7 bowls of water, drink ice-cold freely, sleep soundly, thirst lost. Prescription formulation depends on adaptability.

Question: Lower Xiao has no water, Liuwei Dihuang Wan nourishes Shaoyin Kidney Water, why add Fuzi (Aconite) and Rougui? Because Mingmen Fire (Gate of Life Fire) is weak, unable to steam/cook food/water. Food/water Qi cannot steam upward to moisten Lung, like a pot without fire under the lid being dry, causing thirst. Lung receives nothing, cannot distribute water essence through five meridians to form fluids. Drunk water, untransformed by fire, goes straight to Bladder: drink 1 sheng, urinate 1 sheng; drink 1 dou, urinate 1 dou. Taste is sweet, not salty. Thus, acrid-hot Fuzi/Rougui strengthens the "Lesser Fire" (Shao Huo), adding fuel to the stove, steaming the dry cage, rain on withered crops revives life. Only the wise understand. Emperor Wu of Han had thirst; Zhang Zhongjing prescribed this for Lower Xiao: drink 1 dou, urinate 1 dou. This restricts water flow, preventing downward rush. Kidney water rushing down causes Xiao; rising up causes thirst. Without this, how to treat? Truly profound, an excellent prescription. After carbuncle healing, approaching cure, severe thirst, yellow/hard tongue, pre-thirst, irritability, frequent urination, white turbidity, impotence, poor appetite, emaciation, leg swelling/foot thinning, oral ulcers—all respond well. Cheng Wuji said: Gui (Cinnamon) is like a scepter, guiding Yang Qi, acting as an executor.

Upper Xiao is Heart heat transferring to Lung; Middle Xiao is internal deficiency with Stomach heat. Both recognize Fire/Heat as harmful, using Baihu or Chengqi, ultimately fatal. Essentially, Lower Jiao Mingmen Fire fails to return to its source. Wandering to Lung is Upper Xiao; wandering to Stomach is Middle Xiao. Use Bawei Shenqi Wan (Eight-Ingredient Kidney Qi Pill) to guide Fire back to source. Fire in pot bottom, Water/Fire interact, Qi steams upward, Lung receives moisture, thirst cures. Some crave drinks but stop after 1-2 sips, then thirsty again shortly. Not like Stomach thirst craving endless water. This is Middle Qi deficiency-cold, Cold Water flooding upward, forcing floating Fire to throat/tongue. Upper Jiao wants water relief, but at Middle Jiao, Water meets Water, which it hates. Treatment: For red face/irritability, Lizhong Tang (Regulate the Middle Decoction) with Bawei Wan. Others crave drinks, vomit shortly after swallowing, then seek drink again, cannot keep food/medicine. This is Yin excess repelling Yang, Kidney channel Cold Damage. Zhang Zhongjing used Baitong Tang (White Passages Decoction) plus human urine and gallbladder bile, hot medicine taken cold, cured in one dose. Common in women. Dongyuan also stated: Hand-Yangming Large Intestine and Hand-Taiyin Small Intestine belong to Foot-Yangming Stomach. Large Intestine governs Jin, Small Intestine governs Ye. They receive Stomach Yang Qi to move Jin/Ye to Upper Jiao, irrigate skin/hair, fill pores. Irregular diet, insufficient Stomach Qi, Large/Small Intestines lack Qi, thus Jin/Ye exhausted.

Ruler and Minister Fires balanced cook food, waste removed. Imbalanced, they roast organs, fluids consumed. Heart Fire excessive above causes Diaphragm Xiao; excessive middle causes Intestinal/Gastric Xiao; excessive below causes Paste/Liquid Xiao; excessive outside causes Muscle Xiao. Above excessive spreads to Lung; middle to Spleen; below to Kidney; outside to sinews/bones. Four Zang consumed, Heart self-immolates. Thus, treating Xiao without reducing flavors, abandoning desires, regulating anger/joy, makes disease hard to cure. Danxi said: Xiaoke should drink Silk-Reeling Soup to draw clear Qi upward to mouth. Silkworm/Horse belong to Wu (Fire)/Heart. Cocoon-making implies retreating/storing. Suppresses Heart Fire, stops thirst. Mistaking thirst for Fire, indiscriminately using cold drugs kills. Taking Shengmai San (Pulse-Sustaining Decoction) is best.

*Jing* says: Drink 1, urinate 2, death untreatable. Why did Zhongjing use Shenqi Wan for drink 1 dou, urinate 1 dou? Disease is shallow, perhaps treatable. If emaciated and drinking excessively, too late. In formula, replace Guifu with Wuweizi, adjust per seasons/pulse. Often due to excessive alcohol/sex, excessive emission, Water/Fire not interacting, Kidney water leaking. Cold/Cool Heart agents unsuitable. Long-term urine odorless, turns sweet, vital energy leaks. Floating fat on urine surface, essence uncontrolled, True Yuan exhausted, untreatable.

Five Zang/Six Fu/limbs receive Qi from Spleen/Stomach, move fluids to nourish. Xiaoke disease stems from extreme decline of Damp-Cold Yin Qi and excess of Dry-Heat Yang Qi. Treatment should tonify Kidney Water/Yin deficiency, drain Heart Fire/Yang excess, remove intestinal dry-heat, aid body fluid decline, ensure pathways open not knotted, fluids generated not dried, Qi/Blood harmonious not stagnant, disease resolves itself.

Moreover, Xiaoke results from improper diet/medication, dry intestines/stomach, Qi not smooth, mental overexertion damaging essence/blood, or post-major illness Yin/Blood decline, deficient Yang fierce and dry-heat stagnating. Drinking much/urinating = Xiaoke; Eating much/not very thirsty/frequent urination/emaciation = Xiaozhong; Thirst/endless drinking/leg emaciation/urine with lipid = Xiaoshen. All due to extreme dry-heat, Sanjiao/intestinal pores knotted/stagnant. Despite drinking much inside, cannot moisten outside/nourish body, so thirst persists, urination increases. Shizhen said: Four openings under tongue, two connect to Heart Qi, two pass Kidney Liquid. Heart Qi flows to tongue as Divine Water; Kidney Liquid flows as Spirit Liquid. Daoists call it Golden Elixir/Jade Nectar, overflowing as Sweet Spring, gathering as Hua Chi, scattering as fluids, descending as甘露 (Sweet Dew), irrigating organs, moistening limbs. Cultivators swallow fluids/breathe, called Clear Water irrigating Spiritual Root. Not spitting all day keeps essence/color. Long spitting damages essence, causes Lung disease, dry skin. Far spitting worse than near, near worse than none. Illness disrupts Heart/Kidney interaction, Kidney Water doesn't rise, fluids dry, True Qi耗 (consumed). *Nan Jing* states: Kidney governs Five Fluids: Liver=tears, Lung=snivel, Spleen=spittle, Heart=sweat, Self=spit.

Xiaoke focuses on nourishing Lung, lowering Fire, generating Blood. Banxia (Pinellia) forbidden in Three Xiao. If Xiaoke with diarrhea, use Baizhu (Atractylodes Macrocephala), Baishaoyao (White Peony Root). Post-internal injury dry thirst unresolved: residual heat in Lung. Use small amount of Renshen, Huangqin (Scutellaria), Gancao (Licorice), mixed with fresh ginger juice, taken cold. Tianhuafen (Trichosanthes Root) is divine drug for heat-type Xiaoke. Children with red lips like cinnabar show impending thirst; very red/black dangerous.

*Yijian Zhi* Xiaoke insecticide: For Xiaoke caused by insects consuming essence. Use fresh white bark of Kulian root (Melia Radicis Cortex), handful, cut/dry, add little Muxiang (Costus Root), decoct, take empty stomach. Even if weak, ok. Expel 3-4 worms, roundworm-like, red. Thirst stops. Drinking alcohol/eating roasted food accumulates Stomach heat, damp-heat breeds insects, logically true.