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In the *Suwen* (Basic Questions), Chapter "Tangye Laoli" (Decoctions and Fermented Liquors), Emperor Huangdi asked: There are cases where disease does not originate from the hair follicles (skin pores), but rather from the exhaustion of the Yang Qi of the five Zang organs. Body fluids fill the chest and abdomen, while only the Po (Lung Spirit, governing contraction and descending) remains solitary within. Essence is isolated inside, while Qi dissipates outside. The body becomes so emaciated that clothes no longer fit properly. This presents with stiffness and tremors in the four extremities. This indicates that Qi is obstructed internally while the physical form deteriorates externally. How should this be treated? Qibo replied: One must balance the weight of Yin and Yang, remove accumulated and stale pathogenic factors, gently move the four extremities, ensure warmth in clothing, apply Miu Ci (lateral needling, treating left side for right-side symptoms and vice versa) at corresponding sites to restore the physical form; open the Guimen (sweat pores) to induce sweating, and purify the Jingfu (bladder) to promote urination. In this way, essence will recover in due time, the Yang Qi of the five organs will disperse, and the five Zang organs will be cleared and purified. Consequently, essence will generate naturally, the physical form will become robust, bones and flesh will be preserved, and the Great Qi will return to harmony.

The commentary explains: "Not originating from hair follicles" indicates that the pathogen did not enter through the Couli (interstices/skin pores), but rather that water-dampness overflowed from the interior to the exterior. "Exhaustion of the Yang Qi of the five Zang" is due to Spleen-Stomach deficiency. The Spleen and Stomach belong to Earth, modeling Heaven and Earth, and generating all things. Thus, when food and drink enter the Stomach, the Clear Yang transforms into Qi, and the Turbid Yin forms into Flavor. The Five Zang receive the Qi, which is called Yang; they receive the Flavor, which is called Jing (Essence). This refers to the "Five Yang" mentioned in the classic, which is the Yang of the Stomach cavity. When Qi and Jing are generated, health is maintained. Now, if one cannot receive the Qi of food and drink, there is no Qi to generate; if one cannot receive the five flavors, there is no Jing to transform. The Lung governs Qi and houses the Po. Without Qi, the Po remains solitary. The Kidney belongs to Yang, so its meridians must be activated. When meridians flow smoothly, the food and drink of the Spleen and Stomach can be transformed, and the other four Zang can receive nourishment, allowing treatment to proceed. For water located on the exterior or upper part, use diaphoresis (sweating); for water located on the interior or lower part, use differentiation and promotion of urination. Thus, the treatment discussed in this passage stands in contrast to the Yin deficiency described in the *Ping Re Bing Lun* (Commentary on Heat Disease). That case involves Kidney Yin deficiency unable to resist accumulating Yang heat; this case involves Stomach Yang deficiency unable to control overflowing Water-Yin. Zhang Zhongjing's method states: For edema, if swelling is below the waist, promote urination; if swelling is above the waist, induce sweating, then recovery occurs. Fangji Huangqi Tang, Fangji Fuling Tang, and Puhui San are used (all promote urination). Yueshi Tang, Yueshi Jia Zhu Tang, Gancao Mahuang Tang, Mahuang Fuzi Tang, and Xingzi Tang are used (all induce sweating). From this, we see that Zhang Zhongjing's methods derive entirely from the *Neijing*. Later generations' formulas for edema include Wupi San and Xiangsu San, using pungent herbs like Shengjiang (Rhizoma Zingiberis Recens), Ju Hong (Pericarpium Citri Reticulatae), Zijisu (Folium Perillae), and Dafupipi (Pericarpium Arecae Catechu) to disperse, and bland herbs like Fuling (Poria), Fangji (Radix Stephaniae Tetrandrae), Mutong (Caulis Akebiae Trifollatae), and Sangbaipi (Cortex Mori Radicis) to渗 (leach out dampness). This combines opening the Guimen and purifying the Jingfu. Zhu Danxi said: Because Spleen deficiency fails to control water, causing water-dampness to soak and act recklessly, one should tonify the Spleen with Renshen (Radix Ginseng) and Baizhu (Rhizoma Atractylodis Macrocephalae). When Qi becomes substantial, it naturally functions vigorously, ascending and descending, turning the pivot mechanism, so water flows naturally; this is not the forced water-draining action of Wuling San. He also stated: The *Neijing* says, "All Qi stagnation and depression belong to the Lung." "All dampness, swelling, and fullness belong to the Spleen." "All abdominal distension and enlargement belong to Heat." These three interact to cause disease. Dampness is the Qi of Earth; Earth is the child of Fire. Thus, dampness often arises from Heat, and Heat can transform from dampness, representing the mother Qi sensing the transformation of the child Qi (dampness). When dampness is excessive, Lung Qi fails to circulate and becomes stagnant. Therefore, in edema patients, the Spleen loses its function of transportation and transformation, mixing clear and turbid substances, which condense into water due to stagnation. Once Spleen Earth is diseased, its child, the Lung, also becomes deficient. Ying and Wei fail to distribute, Qi stagnates, and water accumulates, condensing into turbid fluid, penetrating meridians, flowing into valleys, obstructing Jin-Ye (body fluids), and eventually flooding the tunnels, transforming blood into water. Generally, treating edema should focus primarily on resolving dampness. Since the accompanying pathogens differ, treatments vary. It is also advisable to clear Heart Fire and tonify Spleen Earth. When Fire retreats, Lung Qi descends, and water passages open; when Spleen Earth prospers, transportation proceeds, separating clear from turbid. The clear parts revert to Qi, Blood, and Jin-Ye. The severe turbid败 (decayed) parts exit as sweat from above and urine from below, gradually dissipating. Lu Dijing classified edema, claiming that excessive Metal (Lung) generates Water, causing water to overflow recklessly, leading to closed respiration and blocked pivot mechanisms resulting in swelling. He insisted on guiding the Kidney to drain the water. Is this logical? The Lung is the mother of the Kidney, with clear and肃 (descending) Qi. If Lung excess generated water, the Lung would execute its descending command, regulate water passages, transport water downward to the Bladder, distribute water essence everywhere, and run through the five meridians. Why would swelling occur?

Someone asked: Danxi locates the source of water disease in Spleen Earth. Lu locates the source of water in the Kidney, based on the *Shui Re Pian* (Chapter on Water and Heat), where Yin excess causes water overflow. Since the origins differ, treatments must differ. Does Danxi's view contradict the *Neijing*? The answer is no. Let us deduce the meaning of the three chapters of the *Shui Re Pian*, and it will become clear. The first chapter asks why Shaoyin governs the Kidney and why the Kidney governs water. It answers: The Kidney is Supreme Yin (Zhi Yin); Supreme Yin stores water. The Lung is Taiyin; Shaoyin is the Winter pulse. Thus, the root is in the Kidney, the branch is in the Lung, and both involve water accumulation. This describes the normal state where the Shaoyin meridian is superior, governing the Kidney and executing Winter functions, with Supreme Yin storing water via Qi transformation. It does not describe the cause of disease. If pathogenic factors had injured them at that time, the Qi of both organs would have stagnated, causing water accumulation. However, Lu seeks not the pathogenic factor causing Qi stagnation and water accumulation, but instead attributes it to Supreme Yin storing water, claiming organ Qi excess causes disease. This is an error. Otherwise, why does the second chapter ask why the Kidney can gather water and cause disease? It answers: The Kidney is the gate of the Stomach. If the gate is not smooth, water gathers following its kind. Overflowing up and down onto the skin causes swelling. Swelling is disease caused by gathered water. This follows the previous chapter's discussion on water accumulation. The commentary notes that the Kidney governs the Lower Jiao, and the Bladder is the Fu organ, governing distribution. Opening the two yins, Kidney Qi transformation ensures patency of the two yins; closure of the two yins fills the Stomach. Hence, the Kidney is the gate of the Stomach. Closure leads to water accumulation. Regarding the meaning of Qi stagnation and water overflow, it refers to the Qi of the Lower Jiao. Why? The *Lingshu·Benshu* chapter states: Shaoyang belongs to the Kidney and connects upward to the Lung, thus linking the two Zang. The Sanjiao is the official of dredging, the pathway of water channels, belonging to the Bladder, and is the solitary Fu organ. The *Xuanming Wuqi* chapter states: Overflow from the Lower Jiao creates water. The commentary explains that at the site of distribution, if Qi is blocked and not discharged, it overflows into water. It also states: Sanjiao disease presents with abdominal fullness, especially hardness in the lower abdomen, inability to urinate, distress, and urgency. Overflow leads to water retention, resulting in distension. From this, the Qi of the Shaoyang meridian in the Lower Jiao relates to the transformation of Ministerial Fire. Among the Six Qi, only Ministerial Fire has a meridian but no Zang-Fu pair, wandering among the five elements. Thus, Shaoyang is called the "Wandering Department." Its meridian branches superiorly to the Danzhong, dispersing and connecting to the Pericardium; inferiorly, it emerges from Weiyang and connects upward to the Bladder. Is this not assisting the Heavenly Dao's transformation and the Earthly Dao's generation, forming a exterior-interior relationship with Hand-Jueyin to act as the messenger for all meridians? Therefore, when the Kidney meridian is invaded by pathogens, the Fire Qi of the Lower Jiao becomes stagnant. Stagnant Fire prevents the dispersion of water essence, leading to water accumulation. Long-standing Fire stagnation must eventually erupt, rising counter-flow along with the Fire-associated branches of the Chong Mai (Penetrating Vessel). The Chong Mai is the Sea of the Twelve Meridians. Its superior branch emerges from the neck and throat, seeping into Yang meridians and irrigating essence; its inferior branch runs alongside Shaoyang down the leg, seeping into Yin meridians and irrigating collaterals. Thus, water overflows with Fire, accumulating in the Lung, causing wheezing and inability to lie flat; scattering into Yin collaterals, causing swelling; entering and gathering in deficient Zang organs, causing distension of the five Zang. Such diseases are caused by Ministerial Fire flooding water. Without Ministerial Fire, water would not overflow but merely accumulate, as seen in the *Neijing*'s description of Stone Edema (Shi Shui) due to Yin-Yang knotting and skewing, with more Yin and less Yang, presenting with lower abdominal swelling; Water Edema due to knotting and cold of the Three Yin; and Stone Edema indicated by simultaneous deep pulses of the Kidney and Liver.

I further deduce that the failure of Kidney Qi transformation is often caused by the mutual harm of the Four Qi. The Stomach is the overcoming organ of the Kidney. It may be injured by excessive Damp-Heat, harmed by insufficient Stomach Qi sinking, insulted by excessive Heart Fire descending, constricted by Dry Metal, shaken by Wind-Wood, or caused by labor, sexual indulgence, seven emotions, or external pathogens, all leading to Kidney Qi deficiency. The gate of the Stomach closes not only due to Kidney Qi failure but also when the Stomach itself is diseased. Water does not wait for Kidney water to arise; ingested water also gathers. The Stomach governs the Middle Jiao and is the Sea of Food and Drink. When Stomach Qi harmonizes, ascending-descending and intake-excretion Qi moves, and food/drink follow their paths for transport and excretion. When Stomach Qi is disharmonious, the gates of intake and excretion are unsmooth, causing Jin-Ye of food and drink to accumulate and transform into water. As stated in the *Lingshu·Jingmai* chapter: Diseases produced by the Stomach include large abdominal edema and painful, swollen knees. The *Lingshu·Jinye* chapter states: When Jin-Ye of grains fails to transform due to Yin-Yang disharmony, Qi pathways block, the Four Seas close, the Sanjiao fails to discharge, and Jin-Ye does not transform, water and grain remain in the intestines and stomach, staying in the Lower Jiao without seeping into the Bladder, causing Lower Jiao distension. Water overflow results in water distension. Wang Shuhe's *Mai Jing* (Pulse Classic) states: The Spleen embraces its child, Lung Metal. The child fears Fire injury and hides in Water; Wood fears Metal oppression and becomes thorny; the Spleen fears Wood occupying a corner, so Water overflows upward causing distension. From these discussions, "gate not smooth" implies mutual influence between the two organs. The third chapter asks: Do all waters originate from the Kidney? It answers: The Kidney is a Yin organ (Pin Zang). When Earth Qi rises, it belongs to the Kidney and generates fluid liquids. Thus, when one exerts greatly, Kidney sweat appears. If Kidney sweat encounters wind, it cannot enter the Zang internally nor escape the skin externally, lodging in the Xuankou (pores), moving beneath the skin, transmitting into edema. Rooted in the Kidney, it is named Feng Shui (Wind Edema). The phrase "Earth Qi rises" here refers to the human body being formed by Earth's Yin. The Kidney resides below the five Zang, is Supreme Yin, governs water, and generates fluids. Thus, fluids in the body are like water underground. The five fluids transformed by the five Qi all belong to the Kidney. Now, due to Labor Fire forcing Kidney fluids out as sweat, and encountering wind closing the Xuankou, the sweat and wind clash, knotting in the skin. Consequently, old and new fluids transformed by the five Qi gather to form water. By analogy, Kidney Qi labor is not limited to sexual activity. Night walking, wading, falling, carrying heavy loads, extreme anger, or fright can also force Kidney fluids to the surface, where they may encounter wind. This illustrates the Sage's concise yet profound words, exemplifying how one instance applies to ten.

Furthermore, the *Ping Re Bing Lun* states: A patient with Kidney Wind presents with facial swelling, difficulty speaking, and should not be needled when deficient. If needled inappropriately, Qi will arrive after five days. Upon arrival, there will be shortness of breath and intermittent fever. Fever spreads from chest and back to the head, with sweaty, hot hands, dry mouth, bitter taste, thirst, yellow urine, periorbital edema, borborygmus, heaviness making movement difficult, amenorrhea, irritability, anorexia, inability to lie supine (supine position triggers cough). This is named Feng Shui. This indicates Kidney deficiency makes reckless treatment dangerous. Treatment worsens Yin deficiency, allowing Yang to crowd in, affecting the five Zang, producing these heat symptoms. Comparing this with previous descriptions, all water overflow diseases stem from Kidney deficiency. Ignoring deficiency and attacking water directly re-injures Yin. Deficiency allows various pathogens to enter, causing further disease. The *Neijing* also states that simultaneous floating pulses of the Liver and Kidney indicate Feng Shui, showing severe Yin deficiency. Why? The Liver and Kidney reside in the Lower Jiao. The Kidney is Yin, static, with a deep pulse. The Liver is Yang, active, with a floating pulse. Yin pathways are easily depleted; Yang pathways are abundant because both Zang contain Ministerial Fire. If Ministerial Fire moves improperly, movement in the Kidney is like Dragon Fire in the sea, so water attaches and the dragon rises. Movement in the Liver is like Thunder Fire emerging from earth, sudden and stormy, so water surges like waves. Since water follows wind, Liver and Kidney pulses float simultaneously. Wang Bing's commentary suggests wind attacks the lower, resembling Water-Wind pathogen, but people do not know of Wind generated internally by Liver Wood. The *Lingshu·Shui Zhang* chapter lists Water Distension, Skin Distension, Drum Distension, Intestinal Polyp, Stone Fibroma, and Stone Edema. To treat Skin Distension and Drum Distension, first drain the blood collaterals of distension, then regulate the meridians, removing the blood from the collaterals. This Skin Distension corresponds to the *Zhang Lun* chapter, which states that Ying Qi follows meridians, and reversed Wei Qi causes Meridian Distension; Wei Qi merging with meridians and following muscle spaces causes Skin Distension. Needling Zusanli and draining, once for near cases, thrice for distant ones, regardless of deficiency or excess, relies on rapid draining. The Drum Distension in this chapter matches the Drum Distension in the *Fuzhong Lun*, with similar symptoms. There, it was treated with Jishi Li (Chicken Excrement Ferment), effective after one dose, cured after two. If diet is irregular, even if cured, Qi may re-gather in the abdomen. Why does this chapter treat these two conditions by first draining blood collaterals and regulating meridians, differing from the other? The former addresses Qi gathering; this addresses Qi stagnation clashing with Blood, causing Blood coagulation in collaterals and Qi coagulation in meridians, generating water fluid and distension. Hence, treatments differ.

Zhang Zhongjing said: Feng Shui has a floating pulse, external signs of bone-joint pain, and aversion to wind. (*Zhenjing·Lun Ji Zhen Chi* chapter: Look for slight swelling above the eyes like after waking, pulsation of the neck artery, occasional cough, pitting edema on hands and feet—this is Feng Shui/Skin Distension.) Also, Zhang Zhongjing said: Taiyang disease with floating and tight pulses usually presents with bone-joint pain. If there is no pain, but the body feels heavy and achy, and the patient is not thirsty, sweating brings cure—this is Feng Shui. For Feng Shui with floating pulse, heaviness, sweating, and aversion to wind, Fangji Huangqi Tang governs. For Feng Shui with aversion to wind, generalized swelling, floating pulse, no thirst, continuous sweating, and no significant heat, Yueshi Tang governs. Add one prepared Fuzi (Radix Aconiti Lateralis Preparata) if aversion to wind is present. (Continued methods: For Feng Shui with intermittent swelling, joint pain, and急促 (rapid) breathing, Dafupi San governs. For Feng Shui toxin with generalized swelling, Chu Baidi San governs.) Pi Shui (Skin Water) also has a floating pulse. External signs include edema that pits on pressure, no aversion to wind, drum-like abdomen, and no thirst. Diaphoresis is indicated. (Also: Thirst without aversion to cold indicates Pi Shui. Typically, Feng Shui has aversion to cold and no thirst; Pi Shui has no aversion to cold but thirst. Even if Pi Shui has no thirst, diaphoresis is still indicated.) For Pi Shui with limb edema and water Qi in the skin causing trembling limbs, Fangji Fuling Tang governs. For Pi Shui with cold limbs, Puhui San governs. (Continued method: For Pi Shui with generalized facial and bodily swelling, Muxiang Wan governs.) Zheng Shui (Correct Water) has a deep-slow pulse and spontaneous wheezing. Shi Shui (Stone Water) has a deep pulse and abdominal fullness without wheezing. (*Da Qi Lun*: Simultaneous deep pulses of Liver and Kidney indicate Stone Water; simultaneous floating pulses indicate Feng Shui. Continued method: Stone Water presents with thin limbs and isolated abdominal swelling, treated with Haige Wan. Another Stone Water presentation: tight, drum-like abdomen with difficult urination/defecation, treated with Binglang San.) Huang Han (Yellow Sweat) has a deep-slow pulse, fever, chest fullness, and swelling of limbs, head, and face. If prolonged, it leads to abscesses/pus. (Also: Swollen, cold body resembling Zhou Bi, chest obstruction, anorexia,集聚 (gathering) pain, evening restlessness insomnia—this is Yellow Sweat. See Jaundice section for treatment.) Li Shui (Interior Water) presents with yellowish swelling of the whole body and face, deep pulse, and difficult urination, causing water disease. If urination is free, this indicates loss of Jin-Ye causing thirst. Yueshi Jia Zhu Tang governs. Gancao Mahuang Tang also governs. For water disease, deep-small pulses indicate Shaoyin; floating pulses indicate Wind. Empty distension without water indicates Qi. Sweating cures water disease. Deep pulses suit Mahuang Fuzi Tang; floating pulses suit Xingzi Tang. Xin Shui (Heart Water): Heavy body, shortness of breath, inability to lie down, irritability, agitation, and genital swelling. Gan Shui (Liver Water): Abdominal distension preventing turning over, pain in hypochondrium and abdomen, occasional slight saliva production, and continuous urination. Fei Shui (Lung Water): Generalized swelling, difficult urination, and frequent loose stools (duck droppings). Pi Shui (Spleen Water): Abdominal distension, heavy limbs, lack of saliva, shortness of breath, and difficult urination. Shen Shui (Kidney Water): Abdominal distension with umbilical swelling, lower back pain, inability to urinate, dampness under genitals like cow-nose sweat, cold feet, sallow emaciated face, and hard stool. For all water diseases, if thirsty but with difficult urination, or frequent urination, sweating is contraindicated.

Question: A patient suffers from water disease, with swelling of the face, limbs, and body, and difficult urination. Palpation reveals no mention of water, but rather chest pain, Qi rushing up the throat feeling like grilled meat, and mild cough/wheezing. If the Master speaks truly, what is the pulse pattern? Master replies: The Cun Kou pulse is deep and tight. Deep indicates water; tight indicates cold. Deep and tight interacting knot at Guan Yuan. Initially subtle; unnoticed in youth. After Yang declines, Ying and Wei interfere. Yang damages, Yin becomes excessive. Knotting cold moves slightly, Kidney Qi rushes up, causing throat blockage and hypochondriac pain. Physicians mistook this for retained fluid and purged heavily. Qi attack remained, disease persisted. Later, vomiting was induced, causing Stomach deficiency, irritability, dry throat, thirst, difficult urination, undigested food/water, and edema of face/hands/feet. Then Tingli Wan was given to drain water. Temporary relief occurred, but overeating caused recurrence of swelling, chest/hypochondriac pain, resembling Ben Tun (Running Piglet). Water overflowed, causing floating cough and wheezing. One must first attack the Rushing Qi to stop it, then treat the cough. When cough stops, wheezing resolves. Treat new disease first; old disease follows. Above are Zhang Zhongjing's formulas for water, all based on pulse and disease, assessing severity and deficiency/excess before treatment, adhering to the Classics. Why do modern physicians, seeking immediate effect for anxious patients, use Qi-breaking and water-draining methods, unaware that within one or two days, the disease returns incurably? Alas! I lament that most water edema deaths result from two causes: poor patient self-care and physician error in administering purgatives, exhausting Yin-Yang and destroying Stomach Qi. Thus, I have detailed excerpts from *Suwen*, *Lingshu*, and *Jingui Yaolue* with explanations. Those interested should not find this tedious.

Edema varies: generalized, limb, facial, or foot swelling, all termed Water Qi. There is Yang Water and Yin Water. One may initially use Wupi Yin, or Chushi Tang adding Mugua (Fructus Chaenomelis) and Fupi (Pericarpium Arecae Catechu) half qian each. If ineffective, follow with Simo Yin combined with Guihuang Wan, assisted by Red Bean Porridge. Generalized swelling with thirst, red/astringent urine, and constipation indicates Yang Water. Mild cases: Simo Yin with raw Zhike (Fructus Aurantii) ground in; combine with Baohe Wan. Severe cases: Zaoyin Zi to drain, stopping when patent. If thirsty but stool is already loose, do not purge again. Use Wuling San plus Mutong (Caulis Akebiae Trifollatae) and Dafupipi half qian to promote urination. Generalized swelling without thirst, normal or loose stool, small but non-red/non-astringent urine indicates Yin Water. Use Shipi Yin. Urine volume normal, sometimes red, sometimes not, slightly red at night without astringency, also Yin. Do not tonify hastily. Use Muxiang Liuqi Yin, followed by Fuyuan Dan. If stool is not loose but Qi is distended, use Simo Yin with Heixi Dan. Limb swelling, called Zhi Zhong, uses Wupi...