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Liu Zongnong stated: The three Xiao (Wasting and Thirsting) syndromes are generally caused by dryness-heat damaging Yin fluids. However, some cases arise from irregular diet, leading to dryness of the stomach and intestines, where Qi and body fluids cannot circulate smoothly; or from mental exhaustion and overexertion violating natural limits; or following severe illness where Yin Qi is damaged and blood becomes deficient, while Yang Qi becomes hyperactive and dryness-heat intensifies; or from long-term preference for salty foods and indulgence in fried or roasted items, coupled with overeating. There are also cases resulting from long-term use of mineral pills and powders, causing accumulated excess heat to knot in the Lower Jiao, with extreme dryness in the Kidney, thus causing thirst without desire to drink.

If one drinks much water yet urinates much, it is named Xiao Ke (Wasting and Thirsting). If one eats much but is not very thirsty, urinates frequently, and emaciates, it is named Xiao Zhong (Middle Wasting). If one is thirsty and drinks incessantly, legs emaciate, and urine contains fatty substances, it is named Shen Xiao (Kidney Wasting). These three Xiao syndromes share the same pathogenesis of dryness-heat.

Kidney Water belongs to Yin and is fundamentally cold; when deficient, it manifests as heat. Heart Fire belongs to Yang and is fundamentally hot; when deficient, it manifests as cold. If Kidney Water is Yin-deficient, then Heart Fire is Yang-excess. Deficient Water cannot control Fire, and Excess Yang-heat dries up body fluids. Thus, dryness-heat becomes excessive, causing obstruction and stagnation in the collaterals of the San Jiao (Triple Burner) and stomach/intestines. This dense blockage prevents body fluids from permeating, excreting, and irrigating the exterior to nourish the hundred bones. Consequently, although large amounts of water enter the stomach and intestines, they cannot moisten the exterior, leading to unceasing thirst and polyuria. Since body fluids cannot irrigate the exterior, Yin becomes increasingly dry and exhausted, unable to self-nourish. Over time, this often transforms into deafness, blindness, sores, ulcers, acne, and miliaria, becoming critical.

Therefore, treating these diseases requires tonifying the deficiency of True Yin in Kidney Water, draining the excess Yang-heat of Heart Fire, removing excessive dryness-heat from the stomach and intestines, and assisting the decline of whole-body Jin Ye (body fluids). This ensures pathways are dispersed rather than knotted, Jin Ye is generated rather than dried up, and Qi and Blood flow freely rather than stagnate, allowing the disease to heal daily. If one merely uses bitter-cold herbs daily, the condition may transform according to fire, leading to danger.

Yu Jiayan stated: The affliction of Xiao Ke often begins subtly and becomes manifest, starting in the Stomach and reaching its extreme in the Lungs and Kidneys. Initially, it is like pouring water on red-hot charcoal; the water enters and evaporates. Later, it is like throwing water on stone; the water flows away while the stone remains unchanged. When it reaches the stage of drinking one dou and urinating two dou, dryness-fire has disturbed True Yin, and the condition becomes critical.

The Classics state: In treating Xiao Dan (Feverish Wasting), Pu Ji (Sudden Collapse), Pian Gu (Hemiplegia), Wei Zheng (Flaccidity Syndromes), Jue Zheng (Cold/Heat Extremities), and Qi Man Fa Ni (Qi Fullness and Reversal), these are diseases of rich and noble people due to rich and sweet diets. This is the origin of Middle Xiao. Once Xiao Zhong forms, depending on whether the heat moves upward or downward, it transmits sequentially to areas where fire-heat is blazing.

In Upper Xiao, heat from the Stomach transmits upward to the Lung, affecting the "child" via the "mother." Heart Fire transfers heat to the Lung, subjecting Metal (Lung) to the punishment of Fire (Heart). Metal generates Water, and the Lung is the upper source of water. Water drunk enters the Stomach, yields essence, and ascends to the Lung. The Lung regulates water passages and descends them. Now, with fire-heat invading, the water at the high source is forced down by intense heat, combined with external drinking water flowing down like a landslide. Drinking one dou and urinating two dou means not only failing to utilize external water but also exhausting internal essence, which all drains downward. This is worse than sudden diarrhea from the Large Intestine, hence fatal and untreatable. This transmission from Heart to Lung is called "Dead Yin"; conditions belonging to Dead Yin result in death within three days.

Regarding Lower Xiao, heat from the Stomach transmits downward through the "gate" to the Kidney, or mineral drugs deplete True Yin, sexual excess exhausts Jing (Essence), Yang is strong externally, and Yin fails to hold internally. Urine becomes turbid like paste. Drinking one dou and urinating one dou constitutes Shen Xiao. Indulging in lust loses willpower; excessive ejaculation causes fluid turbidity, transforming into fire. This is a critical sign. The Classics say: Below Jun Fire (Ministerial Fire), Yin Essence supports it. If Yin Essence is sufficient, it supports Heart Fire upward, ensuring longevity. If Essence is insufficient, Heart Fire descends directly into the Kidney, and Yang Essence drops, leading to premature death. Thus, the Kidney is the gate of the Stomach. If the gate does not open, water accumulates causing edema; if it does not close, water flows endlessly causing Xiao Ke. For Xiao Ke characterized by drinking one dou and urinating one dou, Sheng Di Huang Wan (Rehmannia Pill) is indicated. It steams and activates Jing Water, supporting Jun Fire upward, stopping the downward flow of sunlight (Ministerial Fire), demonstrating profound therapeutic insight.

Dai Han used Cheng Qi Tang (Order the Qi Decoction) to treat vigorous fire, but applying it to Xiao Ke is inappropriate. The fire in Lower Xiao is fire within water; purging makes it burn brighter. The fire in Middle Xiao is fire in a drained pond; purging causes more injury. The fire in Upper Xiao is prairie fire; rain from heaven can extinguish it, but attacking the intestines and stomach alone is harmful. Earth Qi rises to form clouds, then Heaven Qi falls as rain. Rain comes from Earth Qi; if Earth Qi does not rise, can Heaven rain? Therefore, urgently raising Earth Qi comforts agriculture; urgently raising Kidney Qi irrigates the San Jiao. This is logical necessity.

Jin Gui Yao Lue states: Cun Kou pulse floating and slow; floating indicates deficiency, slow indicates labor/exhaustion. Deficiency means Wei Qi (Defensive Qi) is insufficient; exhaustion means Ying Qi (Nutritive Qi) is depleted. Fu Yang pulse floating and rapid; floating indicates Qi abundance, rapid indicates digestion of food and hard stool. Abundant Qi leads to frequent urination; frequent urination leads to hard stool. Hardness and rapidity clashing constitute Xiao Ke. Cun Kou pulse examines Qi in the chest; Fu Yang pulse examines Qi in the Stomach. Yin inside guards Yang; Yang outside secures Yin. Cun Kou floating means Yin does not guard internally, so Defensive Yang floats externally, indicating deficiency. Cun Kou slow means Yang does not secure externally, so Internal Yin is sluggish, indicating exhaustion. Generally, Ying and Wei are injured, causing Cun Kou to be deficient and slow. Ying is the essence of grain and water; Wei is the fierce Qi of grain and water. Deficient and slow, grain-water Qi does not ascend but stagnates internally, revealing patterns of diaphragm deficiency and Stomach heat. Combined with Fu Yang floating and rapid: floating indicates Qi abundance (heat steaming the chest); rapid indicates food digestion and hard stool. This shows Stomach dryness resisting moisture, following fire-heat rushing to the Bladder, causing polyuria, which further dries the interior. Thus, hardness and rapidity clash, constituting Xiao Ke.

Directly quoting Nei Jing: "Taste excessively bitter, transforms into fire; Spleen Qi becomes damp-less, Stomach Qi becomes thick." This is the source of Xiao Ke, exquisite and subtle.

Jie Gu said: Those who eat well but are thirsty should use Bai Hu Jia Ren Shen Tang (White Tiger Plus Ginseng Decoction); those who do not eat but are thirsty should use Qian Shi Bai Zhu San (Child Master's Atractylodes Powder) plus Ge Gen (Kudzu Root). If late-stage sores and carbuncles appear, fire-pathogens are abundant; urgently attack Yang, do not attack Yin. If Lower Jiao Yuan Qi is strong, life is preserved; if weak, death ensues. These are profound words warning against spring depletion.

However, whether fire is in Yang or Yin, which Zang-Fu organs are involved, and whether treatment should ascending, descending, suppressing, or subduing, varies greatly. Treating according to nature without conflict is the good method. If one treats heat but not fire, fire has no return, and how can heat stop? For example, in Shen Xiao, use Liu Wei Di Huang Wan (Six-Ingredient Rehmannia Pill) for Yin pathology and Ba Wei Di Huang Wan (Eight-Ingredient Rehmannia Pill) for Yang pathology. This is one method. But if one claims this is the only method for Lower Xiao, how can one evaluate the theory that Middle Xiao requires purging?

Dan re transforming into Xiao Zhong involves deep Stomach heat and blazing Stomach fire, causing hunger, easy satiation, and thirst. Many experts suggest Da Cheng Qi Tang (Major Order the Qi Decoction) for purging. They do not realize that gradually accumulated heat and previously stored fire do not require urgent purging. Purging will not remove it, only damaging the intestines and stomach, increasing distress. Even if Da Huang (Rhubarb) is used, it should be steamed long to moderate its nature; Zhi Shi (Immature Bitter Orange) and Hou Po (Magnolia Bark) should be avoided to prevent accelerating movement. Da Huang combined with Gan Cao (Licorice) balances speed and slowness; combined with Ren Shen (Ginseng), it combines purging and tonifying, like Zhao Chongguo's屯田 (tuntian/military farming) strategy—steady and effective.

Zhang Jingyue stated: Xiao syndromes have Yin and Yang aspects, which must be examined. Thirst is Xiao Ke; hunger is Xiao Gu; turbid urine like paste is Shen Xiao. These mostly stem from fire; fire excess leads to Yin deficiency, constituting Yang Xiao syndromes.

As for Yin Xiao, few know its meaning. Anything involving Yin, Yang, Blood, or Qi that gradually declines is called Xiao; this cannot be entirely attributed to fire. Qi Jue Lun states: "Heart transferring cold to Lung creates Lung Xiao; drinking one dou and urinating two dou is fatal and untreatable." This is due to Yuan Qi decline, Cold Metal and Cold Water, where Water does not transform into Qi, and Qi transforms into Water. Is this not a Yang deficiency syndrome? Xie Qi Zang Fu Bing Xing Pian states: "Small and fine pulses in the five Zang organs indicate Xiao Dan." Does a minute pulse indicate an Excess Yang syndrome? This is the clear meaning of Yin Xiao in Nei Jing, yet many fail to observe it.

Thus, ancients associated Upper Jiao with Lung, Middle Jiao with Stomach, and Lower Jiao with Kidney, treating all from fire. They did not know that fire in the San Jiao often originates in the Kidney and invariably stems from Ming Men (Gate of Life). Ming Men is the palace of Water and Fire. When Water is deficient causing Xiao Ke, Water fails to balance Fire, so Fire does not return to its source. Fire wandering in the Lung causes Upper Xiao; Fire wandering in the Stomach causes Middle Xiao; Fire scorching Yin Essence causes Lower Xiao. All these are True Yin insufficiency and Water deficiency in the Lower Jiao.

If Fire is deficient and scorching occurs, it is because Yang fails to transform Qi, so Water Essence does not distribute. Without Fire, Water has descent but no ascent, entering the Bladder directly, causing drinking one dou and urinating two dou. This dries up the spring source and desiccates the earth. These are True Yang insufficiency and Fire deficiency in the Lower Jiao. For Yin deficiency Xiao, treatment should strengthen Water. For Yang deficiency Xiao, claiming treatment should tonify Fire, people will not believe it. Yet, adding fire to the bottom of the pot and rain to withered crops are inevitable truths.