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Q: The theory that the combination of water and fire transforms into dampness was not discussed after the Tang and Song dynasties. Although it is clearly pointed out now, there is no physical evidence to verify it, so it may ultimately fail to convince the world.

A: This is not difficult to distinguish. For example, take a salted fish. After a long period of sunny weather, if the weather changes and rain is about to fall, the salted fish will become moist first. The salt in the salted fish is essentially water. The fish becomes moist because the heat of the sky forces it, causing water and fire to interact to alleviate its excessive dryness. Similarly, dried tea leaves, when roasted by fire, regain moisture, indicating that they originally contain moistening juices. Without fire roasting, they do not appear moist; upon encountering fire roasting, they become moist. This is another verification of fire interacting with water, i.e., transforming into dampness.

Q: Among the Six Qi (Six Climate Factors), there are Heat-Fire and Dryness. Contemporary physicians often confuse these three. May I ask for the distinction of Dryness and the herbs used to treat it?

A: The three are distinct and should not be conflated. The Dryness you asked about is fundamentally different from Heat-Fire. Dryness is opposite to Dampness; Dampness is transformed from the interaction of water and fire, whereas Dryness is the state where water and fire do not interact. If fire does not evaporate water, clouds and rain will not form; if water does not nourish fire, dew and moisture will not descend, thus forming Dryness. If water fails to moisten, Wood Qi cannot nourish, leading to the yellowing and falling of grass and trees; if fire fails to evaporate, Earth Qi cannot activate, leading to the exhaustion of fatty tissues and vessels. The reason for the non-interaction of water and fire lies in the contracting nature of Metal. Contraction causes water and fire to return to their original homes; hence the deity is called Rushou (Harvest Receiver), governing autumn. At this time, grass and trees wither, and soil springs dry up, which is the verification of Dry-Metal being in charge. Humans who inherit the Qi of Dry-Metal belong to the Yangming Meridian, associated with the Stomach and Large Intestine. Although the Stomach belongs to Earth, it is primarily Dry, so together with the Large Intestine, they constitute Dry-Metal. Metal's contraction prevents the interaction of water and fire, creating Dryness; thus, Dryness is the Qi consumed by the separation of water and fire. The digestion of food and drink in the intestines and stomach relies on this drying/consuming property. If the drying transformation is insufficient, water cannot be processed, leading to vomiting and diarrhea; treatment focuses on Banxia (Pinelliae Rhizoma), Chenpi (Citri Reticulatae Pericarpium), and Baizhu (Atractylodis Macrocephalae Rhizoma). Wuyu (Evodiae Fructus) is also acrid-dry; ripening in the ninth month, it perfectly obtains the Qi of Dry-Metal, thus removing fluid retention by overcoming dampness with dryness. Cangzhu (Atractylodis Rhizoma) dries Spleen-Stomach Earth; Yuren (Prunella Fructus) is acrid-astringent and enters the Large Intestine; Caoguo (Tsaoko Fructus) is intensely drying and eliminates damp accumulation from melons and fruits. However, these all treat damp diseases caused by insufficient dryness. If it is a primary disease of Dryness, it belongs to an excess of Dryness Qi. Presence of body fluids means no dryness; absence of body fluids means dryness. Zhang Zhongjing emphasized preserving body fluids, which is precisely treating dryness. In cases where fire fails to evaporate water, preventing fluid ascent, such as thirst in Wuling San syndrome, Guizhi (Cinnamomi Ramulus) is appropriate; in Lizhong Tang syndrome with thirst, Ganjiang (Zingiberis Rhizoma) is appropriate; in Shenqi Wan for treating lower Xiao (wasting-thirst), Guizhi (Cinnamomi Ramulus) and Fuzi (Aconiti Lateralis Radix Praeparata) are appropriate. For cold constipation, Danggui (Angelicae Sinensis Radix) provides moist-warmth, and Badou (Crotonis Fructus) provides acrid-moisture; both treat dryness caused by fire failing to evaporate water. Western medicine uses Ricinus oil to unblock the large intestine, which is also a moist-warming method, treating cold dryness. Such cases are rare; Fire-Dryness cases are most common. If water fails to moisten fire, Fire-Dryness forms, blood fails to flow downward, leading to dry intestines, dysphagia, and feces like sheep droppings. Treatment involves Heidou (Sojae Semen Nigrum), Zhima (Sesami Semen), Rousongrong (Cynomorphii Herba), Danggui (Angelicae Sinensis Radix), Haren (Cannabis Semen), Shengdi (Rehmanniae Radix), and Shanyao (Dioscoreae Rhizoma) to generate fluids and moisten. If water fluids fail to ascend, causing dry mouth, lung atrophy, phlegm stagnation, and cough/counterflow qi, Ejiao (Asini Corii Colla), Beimu (Fritillariae Bulbus), Maidong (Ophiopogonis Radix), Ziwan (Asternis Radix), Guashuang (Gypsi Fibrum), Baihe (Lilii Bulbus), Baimi (Mellis), and Yanci (Hirundo Nidus—due to its high position and association with Qi level, Yang fluids reach easily but Yin fluids rarely arrive) are used. Maidong (Ophiopogonis Radix), Tiandong (Asparagi Radix), Danggui (Angelicae Sinensis Radix), and Renshen (Ginseng Radix) are also employed. For severe dryness with thirst, Huafen (Trichosanthis Radix), Fenge (Puerariae Radix), and Yanmei (Prunii Mume Fructus) moisten and generate fluids. If fire is excessive with dry stool, urgent purgation is needed; Mangxiao (Natrii Sulfas) moistens and cleanses, while Dahuang (Rhei Radix et Rhizoma) attacks and drains. This purgation saves body fluids; with fluids, there is no dryness. People only know to purge fire, not realizing that saving fluids saves against dryness. However, purging can also deplete fluids, hence warnings against purging. Other examples include Jin Kou Li (Lockjaw Dysentery), where fluids do not ascend, preventing food intake; Western medicine calls this intestinal inflammation, leading to rot over time. This is the extreme of water failing to moisten fire. Treatment prioritizes Huanglian (Coptidis Rhizoma) and Shengdi (Rehmanniae Radix), assisted by Baiju (Chrysanthemi Flos), Huafen (Trichosanthis Radix), and Huangqin (Scutellariae Radix). Yin Chui (flatulence passing through vagina) with dry stool is treated with Pig Fat and Hair Decoction (Zhigao Fa Jian), embodying intestinal moistening. Wind overcomes dampness; wind injuring blood leads to sinew dryness, treated with Yuzhu (Polygonati Odorati Rhizoma) and Danggui (Angelicae Sinensis Radix). Dry and painful urination is treated with Cheqianzi (Plantaginis Semen), Huashi (Talcum), Dongkuizi (Malvae Semen), and Rousongrong (Cynomorphii Herba) to lubricate. Female uterine dryness can be treated with Dihuang Tang (Rehmanniae Decoction). Heart lacking fluids causes vexation; mild cases use Baiziren (Biota Seed) and Zaoren (Ziziphi Spinosae Semen); severe cases use Jizihuang (Elevi Ovis Ovum) and Ejiao (Asini Corii Colla). The *Neijing* states the Kidney dislikes dryness; for Kidney essence deficiency, Gouqi (Lycii Fructus), Tusizi (Cuscutae Semen), Shudi (Rehmanniae Radix Preparata), Guijiao (Testudinis Carapax et Plastrum Colla), and Ejiao (Asini Corii Colla) are used. When urination is frequent but stool is hard, Zhang Zhongjing uses Fuzi (Aconiti Lateralis Radix Praeparata) and Baizhu (Atractylodis Macrocephalae Rhizoma), employing fire to evaporate water and circulate fluids. In summary, Dryness is the consuming Qi of non-interacting water and fire, manifesting as Cold Dryness or Heat Dryness, with Heat Dryness being more common due to "fire adhering to dryness."

Q: Heat and Fire are hardly distinguishable, yet the *Neijing* assigns Fire to Shaoyang and Heat to Shaoyin. How should medications for treating Fire and Heat be distinguished?

A: They can be distinguished. Consider summer weather: intense sun, sweating profusely—this is Heat, the Yang of Heaven. Consider burning wood and charcoal, spreading like a prairie fire—this is Fire, the Yang of Earth. Shaoyin Heart-Kidney relates to Kan and Li in humans. Although the Heart belongs to Fire, it is like the sun in the sky, accumulated Yang, unlike fire that requires fuel to shine. Thus, Shaoyin is named Heat Qi, following its origin from Heavenly Yang. This Qi belongs to the Heart but roots in the Kidney; it is the single Yang within the Kan Water of the Kidney Mingmen, ascending to the Heart to form Heat Qi, causing internal vexation and heat. Zhang Zhongjing uses Huanglian Ejiao Jizi Huang Tang (Coptis, Donkey-Hide Gelatin, and Chicken Yolk Decoction). Ejiao obtains water from the A-Jing underground stream, possessing the ability to submerge Yang within water; Huanglian is extremely cold, sharing the nature of water, thus clearing heat; Jizi Huang nourishes Heart fluids. These three ingredients fill Li (Fire) and clear Kan (Water), treating internal Heart heat. Zhi zi (Gardeniae Fructus) is bitter and cold; its skin and septum resemble the Pericardium. Its inner seeds are red, corresponding to the Heart's color. Its flowers are white, corresponding to Lung Metal. Its fruit turns red, corresponding to Heart Fire. It enters from Lung to Heart, correctly treating internal Heart vexation. The *Neijing* states the Heart is the Sovereign, and the Lung is the Minister, regulating the Sovereign's excess. Zhi zi's white flower and red seed exemplify using Lung Metal to control Heart Fire. Thus, Zhang Zhongjing uses Zhi zi Chi Dou Tang (Gardenia and Fermented Soybean Decoction) for internal restlessness. Soybeans are the grain of the Kidney; fermented into Chi dou (Fermented Soybean), they raise Kidney Yin fluids to descend Heart Heat. This shows Shaoyin Heart-Kidney belongs to Heat Qi, not Fire. Lian qiao (Forsythiae Fructus) has a shell and seeds, resembling a covering for the Heart; its light and clear aroma makes it a heat-clearing herb entering the Heart. Lian xin (Nelumbinis Plumula) obtains Kan Water Qi, growing atop the Lotus seed heart, resembling the human Heart, thus clearing Heart heat. Zhu ye (Bambusae Folium), Hanshui shi (Halloysitum Rubrum), and Shigao (Gypsum Fibrosum) inherit the cold Qi of Heaven/Water, treating all heat. Digupi (Lycii Cortex) remains green in winter, obtaining Water Yin, thus treating heat. Xuanshen (Scrophulariae Radix) is black, enters the Kidney, and treats heat. Heat differs from Fire. Dahuang (Rhei Radix et Rhizoma) treats Fire, inheriting Earth Qi, entering the Postnatal Blood aspect. Mangxiao (Natrii Sulfas) treats Heat, inheriting Heavenly Water Qi, entering the Prenatal Qi aspect. Zixue Dan (Purple Snow Pill) does not use Dahuang but uses Shigao (Gypsum Fibrosum), Mangxiao (Natrii Sulfas), Xijiao (Rhinocerotis Cornu), Lingyangjiao (Saigae Tataricae Cornu), Hanshui shi (Halloysitum Rubrum), and Jinbo (Folium Aurum), all based on Heavenly Water Yin to clear heat. Niuhuang Qingxin Wan (Calculus Bovis Clear Heart Pill) contains Dahuang entering the Blood aspect, and Niuhuang (Calculus Bovis) moving through the diaphragm into the Pericardium, using Local Fire Yin to purge Fire. Generally, Heavenly Yang is in the air; when Heat attaches to Wood, it burns into Fire. Human Yang is in the Heart; when Heat attaches to Blood, it returns to the Pericardium, combining with Liver Wood to form Fire. Knowing this distinguishes Heat from Fire. Heart-Kidney Yin deficiency generates Heat; Tianwang Buxin Dan (Emperor of Heaven's Special Pill to Tonify the Heart) uses Erdong (Ophiopogonis and Asparagus roots), Erdi (Rehmannia roots), Danshen (Salvia miltiorrhiza root), and Xuanshen (Scrophulariae Radix) to benefit Water Yin and balance Heart Heat. Bone-steaming night sweats and consumption steaming result from Water Qi leaking outward, Yang escaping, and generating Heat, not Fire. Treatment requires clearing, moistening, descending, and astringing. Digupi (Lycii Cortex), Danpi (Moutan Cortex), Zhimu (Anemarrhenae Rhizoma), Huangbai (Phellodendri Cortex), Dong Sangye (Mori Folium), Guijiao (Donkey-Hide Gelatin), Dihuang (Rehmanniae Radix), Maidong (Ophiopogonis Radix), and Xuanshen (Scrophulariae Radix) all benefit Heavenly Water Yin to clear Heat. Zhimu leaves are extremely resilient; even if pulled, they grow back, indicating abundant Water Qi, thus clearing Qi-level Heat. Qi belongs to Yang, Blood to Yin. Blood stasis obstructing Qi prevents Yang from entering Yin, causing steaming heat and sweating. Breaking blood allows Qi to enter Blood, relieving heat stagnation. Taoren (Persicae Semen) and Danpi (Moutan Cortex) are primary. Zhang Zhongjing's Mengchong Wan (Bug Pill) and Wenjing Tang (Warming the Menses Decoction) break blood to unblock Qi; once Qi flows, heat ceases steaming. This is a modified method for treating Heat. Sores rising with pus often involve fever, representing Qi steaming Blood. Abundant Qi causes Blood to transform according to Qi, forming pus. Without fever, Qi is weak, unable to steam pus; Huangqi (Astragali Radix), Guizhi (Cinnamomi Ramulus), and Fuzi (Aconiti Lateralis Radix) tonify Qi, assisting heat generation for Blood transformation. Vaccinia follows the same principle. This shows Heat belongs to the Qi aspect, differing from Fire belonging to the Blood aspect. Hence, Ou zhi (Lotus Rhizome Juice), Li zhi (Pear Juice), Laifu zhi (Radish Juice), Watermelon, Zhenzhu (Pearl), Shuijingshi (Quartz), Yuanjingshi (Plumbum), and Hanshui shi (Halloysitum Rubrum) all obtain Water Qi to clear Heat.

Q: Blood belongs to Fire, Qi belongs to Water. Now it is said Heat belongs to the Qi aspect. Why does the Heart govern Heat Qi and yet generate Blood?

A: The Heart in the human body is like the Sun in the sky. Heavenly Yang generates Earth Fire; thus, taking fire from the sun generates Fire attached to Wood. The Heart Meridian transforms fluids to generate Blood, which returns to the Liver. Therefore, the Liver and Pericardium/Gallbladder draw on Minister Fire, while Shaoyin Heart and Kidney alone govern Heat Qi. Cases of Minister Fire assisting Heat are treated with clearing agents like Huangqin (Scutellariae Radix) and Huanglian (Coptidis Rhizoma), or attacking agents like Xiaoshi (Natrii Sulfas) and Dahuang (Rhei Radix et Rhizoma), treating Heat while addressing Fire, akin to summer heat plus a stove fire. Cases of Heat assisting Minister Fire are like sun-baked volcanoes or wind-fanned torches; differentiation should follow this analogy. Discussing the Five Zang organs, the Heart belongs to Fire; discussing the Six Qi, Heart and Kidney both govern Yang Heat, while Fire belongs to Shaoyang. They can be separated or combined, requiring careful differentiation.

Q: Heavenly Yang generates Earth Fire, so the Heart generates Minister Fire of the Pericardium. Pericardium Blood stores in the Liver, so the Liver houses Minister Fire, embodying the unity of Wood and Fire. Yet the Pericardium and Liver are named Jueyin Meridians, collectively termed Wind Qi, not Minister Fire. Only Shaoyang Gallbladder and Sanjiao speak of Fire. Lord Fire and Minister Fire are later theories, inconsistent with the Six Qi. How should they be treated?

A: Calling the Pericardium Minister Fire is a later theory, not the original meaning of the *Neijing*. The *Neijing* only states: "The Chest Middle (Dan Zhong) is the official of the messenger, from whom joy arises." It implies the Heart distributes transformation; smooth blood vessels bring joy. Those with sufficient blood do not fear cold, showing Blood belongs to Heat, while Qi does not exclusively belong to Fire. Thus, Liver and Pericardium are not called Minister Fire. Only because the Pericardium connects with the Sanjiao can Sanjiao Fire combine with the Pericardium. The Liver connects with the Gallbladder, hence "Liver can transform into Fire." Ultimately, Fire Qi fully归属于 the Gallbladder, as it is Fire born from Wood. The Gallbladder connects to the Liver diaphragm, communicating with membranes, which is the Sanjiao. The transformation of Gallbladder Fire occurs entirely in the Sanjiao, moving through the network membranes; thus, Gallbladder and Sanjiao jointly govern Minister Fire. Counterflow qi with bitter vomiting is treated primarily with Huangqin (Scutellariae Radix); bitter and green, it enters the Gallbladder. Chaihu (Bupleuri Radix) obtains Wood Qi to penetrate and reach, preventing Fire stagnation. Heluye (Nelumbinis Folium) also clears and disperses Gallbladder Fire, resembling the Zhen trigram and having a bitter taste. Qingdai (Indigo Naturalis) is green and bitter, clearing Sanjiao Liver-Gallbladder Fire; its light quality treats throat conditions. The *Neijing* indicates that the binding of Two Yin (Shaoyin) and One Yang (Shaoyang) causes throat bi. Two Yin is Shaoyin, governing Heat; One Yang is Shaoyang, governing Fire-Heat. Their binding causes throat bi. Thus, treating throat conditions requires dispelling Fire and clearing Heat together. Lan ye (Isatidis Folium) treats Liver-Gallbladder Fire, slightly heavier than Qingdai. Haijinsha (Lygodii Spora) forms between leaves, resembling the Gallbladder attached to the Liver; its bitter taste clears Fire, making it essential for treating sand strangury. Sanjiao connects with the Gallbladder; only when Gallbladder Minister Fire binds does Sanjiao Water bind. This herb resolves binding with binding, thus treating it. Wubeizi (Galla Chinensis) also has seeds between leaves, with a salty taste providing moistening and descending action, moistening and removing Phlegm-Fire in the Lung. It also clears the Gallbladder due to seeds between leaves. It clears the Sanjiao because the Sanjiao roots in the Kidney system, and Wubeizi's salinity enters the Kidney. Sangjisheng (Taxilli Caulis et Folium) grows attached to wood, resembling the Gallbladder attached to the Liver; sour and bitter, it obtains Wood-Fire flavors, clearing Gallbladder Fire and treating wind-heat sinew bindings. The Gallbladder connects to Sanjiao membranes, externally linking to sinews; Sangjisheng vines attach to wood, resembling human sinews. Longdancao (Gentianae Radix) is bitter with many roots, descending Gallbladder and Sanjiao Fire. Huhuanglian (Coptidis Rhizoma alternative/Huanglian species?) is hollow, like Huangqin, accessing hollow membrane cavities; extremely bitter, it correctly treats Minister Fire, thus treating consumption steaming. This bitterness differs from Huanglian. Huanglian obtains the true bitter flavor, entering the Heart to purge Heat. Longdancao and Huhuanglian obtain bitter-acid altered flavors, entering Liver-Gallbladder and Sanjiao. Xiakucao (Prunella Spica) inherits Spring Shaoyang Qi, withering in Summer; bitter, it clears Liver-Gallbladder and Sanjiao Fire. Luoli (scrofula) is a binding of sinews on the head top. This herb grows creeping, resembling sinews; its light floating nature ascends to the Upper Jiao, treating neck bindings. Being harvested when withered implies consumption. Qinghao (Artemisiae Annuae Herba) is green and bitter, withering Liver-Gallbladder Minister Fire. Red worms must grow in its nodes, insects born from Wind influence; thus, Qinghao is a wind-dispelling and heat-clearing herb. Human consumption worms arise from Liver Qi and Minister Fire fanning each other, borrowing Blood to form substance; bone steaming must occur before worms generate. Qinghao nodes use insects to kill insects, eliminating stasis and steaming, borrowing insects to attack Blood and Wind Qi to disperse stagnant Fire. Fangji (Stephaniae Tetrandrae Radix) tastes like Longdancao and is hollow, penetrating membranes to clear Sanjiao Minister Fire and promote water flow. Gualou shi (Trichosanthis Fructus) seeds have oil and strong Qi; the pulp inside is bitter. Crushed and combined, they resolve diaphragmatic Phlegm-Fire. Shandougen (Sophorae Tonkinensis Radix) is white and bitter, entering the Lung to purge Fire. By Metal calming Wood, Fire does not rise and instead attacks Metal; thus, it treats sore throat. Throat conditions involve Shaoyin Heart and Sanjiao; Shandougen treats Wood-Fire, thereby treating the Sanjiao. Machixian (Portulacae Herba) contains mercury in leaves, obtaining Metal-Water nature; sour and cold, it clears Sanjiao Fire to promote water flow. Liyu dan (Carp Gallbladder) and Qingyu dan (Black Carp Gallbladder) enter Liver-Gallbladder by similarity; bitter and aquatic, they perfectly obtain Water nature, serving as primary drugs for Liver-Gallbladder Fire. Yan hou mu (rock throat eye conditions): Xiong (Bear) lives in mountains, fur-bearing animals inherit Wind nature, and gallbladder is extremely bitter; thus, it enters Liver-Gallbladder to clear Fire and treat throat/eye conditions. Digupi (Lycii Cortex) is thick like human membranes, bitter and cold, clearing Sanjiao Fire. Sanjiao and Gallbladder jointly govern Minister Fire, but Sanjiao roots in the Kidney. Kidney Yang Qi ascends via the Sanjiao pathway, so the Kidney can transfer Heat to the Sanjiao. Digupi penetrates deep into soil, obtaining Qi from underground springs, thus clearing Heat in Kidney Water and draining Mingmen Heat.