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Why is the vomiting method used for treatment? The answer is: to utilize the principle of Qi transformation. The Classics state: The Sanjiao (Triple Burner) is the official in charge of irrigation, and the water passages emerge from it. The Bladder is the official of the capital, where body fluids are stored; only through Qi transformation can they be excreted. Therefore, if the Qi of the Upper, Middle, or Lower Sanjiao fails to transform in any one aspect, the water cannot flow out smoothly as if from an irrigated channel. Is it merely due to Qi obstruction in the Lower Jiao Bladder alone! The Lung, located in the Upper Jiao, governs the circulation of Ying (Nutritive) and Wei (Defensive) Qi, regulates the water passages, and transmits them downward to the Bladder. Moreover, the Kidney connects upward with the Lung. Does this not indicate that urination depends on the Qi transformation of the Upper Jiao? Zhang Zhongjing stated that when Stomach Qi moves freely, urination becomes unobstructed. The *Neijing* states that when the Spleen is diseased, the nine orifices become blocked. Urinary difficulty shares the same pathological mechanism. Thus, the pathogenic factors affecting the Sanjiao vary, and the changes of Qi are infinite. Therefore, one must treat the pathogen and promote water metabolism according to the specific situation. The key lies in ensuring Yin and Yang do not bear an imbalance, so that Qi can undergo transformation. As stated in the *Fang Sheng Lun* (Treatise on the Balance of Excess and Deficiency): When Yin reaches its extreme deficiency, Heavenly Qi (Yang) is cut off; when Yang reaches its extreme excess, Earthly Qi (Yin) is insufficient. The Kidney and Liver are located below, belonging to Earthly Qi; the Heart and Lung are located above, belonging to Heavenly Qi; the Spleen and Stomach reside in the center, at the junction where Qi interacts. Therefore, if Heavenly Yang is cut off and fails to descend to interact with Earth, even white dew will not fall. How much more so for humans who correspond to Heaven! If the Yang above fails to descend and interact with Yin, the Yin below becomes deficient. If the excessive Yang above fails to maintain its virtue and instead attacks the lower part, causing the Kidney Qi to fail in transformation, one must drain the excess Yang and raise it, so that Yin can be balanced. For the symptoms described in this section, the vomiting method is employed because the Qi pathway is blocked, and the ascending and descending movements are stagnant! Other methods are not abandoned solely to use this one. The Master once said: "My use of the vomiting method to promote urination is like a vessel dripping water; if you open the upper aperture, the water naturally flows out from the lower aperture!"

A fifty-year-old woman suffered from difficult and scanty urination. She was treated with formulas such as Bazen San (Eight-Right Decoction), resulting in distension and urgency of the Small Intestine with no relief, and her body felt as if pierced by thorns. Considering that she had been exposed to continuous heavy rain, with dampness still lingering in the exterior, I used Cangzhu (Rhizoma Atractylodis Macrocephalae) as the sovereign herb, assisted by Fuzi (Radix Aconiti Lateralis Preparata) to release the exterior. After one dose, she sweated, and urination immediately became free.

An eighty-year-old man suffered from short and scanty urination. Due to excessive use of diuretic methods, he produced not a single drop. This was caused by dietary injury leading to the sinking of Stomach Qi into the Lower Jiao. He was administered Buzhong Yiqi Tang (Decoction for Supplementing the Middle and Augmenting the Qi), and after one dose, urination was restored.