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Gualou Shi (Trichosanthes Fruit), bitter in taste, cold in nature, descending and yin, non-toxic. Enters the Lung and Stomach meridians. It is most capable of directing qi downward and cleansing filth, especially resolving stagnation and opening the appetite. It can treat Shaoyang Jie Xiong (a syndrome in Cold Damage diseases where pathogenic heat and phlegm-fluids bind in the chest), dispel phlegm, relieve thirst and generate fluids, and promote lactation. However, one must strictly avoid using it lightly. It should only be used to purge when accumulated filth and stagnant qi are bound in the upper chest and refuse to descend; otherwise, one must never act rashly. This is because Gualou Shi easily depletes true qi. Using it for Shaoyang Jie Xiong is a measure of last resort. If there is no Jie Xiong syndrome, how can it be used lightly? As for its effects of dispelling phlegm, relieving thirst, and promoting lactation, it should only be used in small amounts, and heavy dosage must be avoided. Other materia medica texts claim it treats deficiency-type consumption coughs; this is harmful advice and absolutely unreliable, stemming from confusion with the idea of "tonifying the lungs." In fact, Gualou is a drug for breaking hard accumulations, not a product for tonifying deficiency.

Tianhuafen (Trichosanthes Root) is the root of Gualou, but their properties differ significantly. Gualou Shi has the most fierce nature, unlike the mildness of Tianhuafen. When using Gualou Shi, it is better to substitute it with Tianhuafen. Tianhuafen also dispels phlegm and directs qi downward, moistens dryness to relieve thirst and generate fluids, clears heat and removes irritability, expels pus and removes toxins, drives out blood stasis and calms mania, promotes urination, and regulates menstruation. Its functions are more numerous than those of Gualou Shi. For deficient individuals with phlegm, it can also be used in small amounts to resolve dryness and nourish withered tissues; why then use Gualou Shi lightly?

Someone asked: Gualou Shi can trap pathogens in the chest and is an essential herb for treating Cold Damage, yet you strongly caution against its use. Would it not be more appropriate to delete Gualou and retain only Tianhuafen? I replied: The medical way requires combining the "King's Way" (gentle regulation) and the "Hegemon's Way" (aggressive attack) to achieve victory through surprise and save life and death in an instant. The Jie Xiong syndrome is fatal within moments. Using Tianhuafen to eliminate fullness works slowly; using Gualou works swiftly. However, the fullness of Jie Xiong varies. For minor fullness, Tianhuafen may suffice; for major fullness, Gualou is indispensable. This depends on the physician's careful differentiation at the bedside; it does not mean Gualou is entirely unnecessary. [Comment: Truly words that understand flexibility and adaptation.]

Someone doubted: Gualou pushes food from the chest and sweeps pathogens from the stomach with great force. By the time Cold Damage reaches Jie Xiong, the righteous qi is already greatly depleted. Using such a pushing agent would not make the deficient even more deficient? You also said Tianhuafen cannot replace it; can the deficiency of Cold Damage be ignored so casually? I replied: If Cold Damage ignores deficiency, pathogens will consume all the body's yuan qi, leading to death in an instant; how can it be ignored? Using Gualou to trap the chest is precisely to protect the deficiency. The formation of the trapping chest condition occurs because, when pathogens retreat, eating too soon causes pathogens to re-aggregate. Pathogens dissipate because the stomach becomes empty, leaving them nowhere to attach, thus allowing them to scatter naturally. Once pathogens leave the stomach, stomach qi opens, causing hunger. If one can endure without eating for half a day, pathogens will fully dissipate. Unfortunately, people crave food as soon as pathogens begin to scatter. Once food enters the throat, pathogens re-accumulate. Therefore, Zhang Zhongjing established the Xiaoxiong Tang (Chest-Trapping Decoction), using Gualou as the sovereign herb to break through, advancing unimpeded. Frightened by this, pathogens retreat. Then, gradual tonification restores peace to the chest and stomach qi. Thus, pushing away pathogens is clear evidence of urgently saving righteous qi. If one hesitates and dares not use Gualou lightly, although food may eventually digest and problems resolve, much righteous qi will have been damaged. This is why Gualou must be used urgently, without hesitation.

Someone asked: Gualou traps the chest to save stomach qi, which is correct. But I fear Gualou, after removing pathogens, moves into the Spleen, moving without staying, thereby harming the Spleen. Is this not shifting disaster to a neighbor state? I replied: Gualou can only trap pathogens in the chest, not in the abdomen. Food in the chest can be pushed into the abdomen; food in the Spleen need not be swept into the intestines. The Spleen governs output and transforms easily, while the Stomach governs reception and digests with difficulty.

Someone asked: Does Gualou trap pathogens or food in the chest? I replied: The Jie Xiong syndrome invariably forms due to food retention. Xiaoxiong Tang traps food, not pathogens. Although pathogens re-aggregate due to food, even if pathogens do not enter the stomach, they actually distribute at the entrance of the stomach. Trapping the food in the chest leads to the dispersal of pathogens, so calling it "trapping pathogens" is acceptable. However, food can be trapped, but pathogens cannot. Food trapped enters the Spleen; pathogens trapped enter the Kidney. What enters the Spleen, Gualou can drive through victoriously; what enters the Kidney, Gualou cannot reach, potentially causing unpredictable changes. Now, using Xiaoxiong Tang eliminates food and scatters pathogens, proving that Xiaoxiong Tang actually traps food, not pathogens. But if it only traps food and not pathogens, how do pathogens completely scatter? Because the Jie Xiong syndrome forms due to food, the pathogens in the Xiaoxiong Tang formula also scatter due to the trapping of food.

Someone suspected that Xiaoxiong Tang using Gualou traps not only chest pathogens but also abdominal pathogens. If pathogens are in the abdomen, how do we know they won't be driven into the Kidneys? I replied: The momentum of Xiaoxiong Tang is most swift; pathogens encounter Gualou and scatter immediately. How could they enter the Kidneys? Moreover, pathogens in the abdomen differ from those in the chest. Those in the chest are high and low, fearing loss into the Kidneys; those in the abdomen tend toward the Large Intestine, a convenient path. Would they reverse course into the Kidney meridian?

Someone asked: Gualou and Tianhuafen come from the same source, why does Tianhuafen not sweep chest pathogens as swiftly as Gualou? I replied: Tianhuafen resolves fullness slowly; Gualou Shi resolves fullness swiftly, as stated earlier, though I did not explain why. Gualou is the fruit of Tianhuafen, and Tianhuafen is the root of Gualou. The fruit hangs from the tree, its nature tending toward the root, so its downward movement is urgent. The root hides in the earth, its nature clinging to the fruit, so its upward growth is slow. The reason for slowness and swiftness lies here, and the functions of trapping and eliminating also differ here. Therefore, use Tianhuafen when slowness is suitable, and Gualou Shi when swiftness is required. Why worry about efficacy not manifesting?