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The *Huangdi Neijing* (Yellow Emperor's Inner Canon) states: In the condition of *Fuzhang* (Skin Distension), cold pathogenic qi lodges between the skin layers, resulting in abdominal distension and generalized edema. The skin is thick; upon pressure, the indentation does not rise immediately, and the abdominal color remains unchanged. This constitutes its clinical presentation. It further states: All swellings and fullnesses caused by dampness belong to the Spleen. It also states: In water diseases (*Shuibing*), if upward invasion causes panting and inability to lie flat, it indicates that both the root (internal organs) and branch (exterior) are diseased.

Chen Feixia stated: The syndromes of swelling and fullness all stem from deficiency of the Spleen and Stomach. Earth of the Spleen prefers dryness and abhors dampness. If the Middle Qi is inherently weak, and Spleen deficiency lacks Yang fire, then water-dampness can take advantage to invade. Spleen deficiency fails to transport and transform, causing food and fluids to congeal and fail to digest, stagnating within the middle jiao, thereby generating swelling and fullness. When treating swelling, one must treat the Spleen and Stomach as the root, and regard superficial edema as the branch. If one relies solely on purgative and dispersing methods, it will inevitably lead to critical danger. One must also distinguish the location of onset. The Classics state: Facial swelling is due to Wind; foot swelling is due to Dampness. Swelling originating from above is mostly due to Wind; treatment focuses on the Lung, employing dispersing methods, such as combining *Shensu Yin* with *Wupi Yin*. Swelling originating from below is due to Kidney deficiency with flooding of water, or Spleen Qi constrained by dampness; treatment employs draining and promoting urination. Zhang Zhongjing said: Treating dampness without promoting urination is incorrect treatment; one should use *Wuling San* added with *Fangji* and *Binglang*. Generalized swelling may result from congenital insufficiency followed by sudden exposure to wind-cold, or from Spleen deficiency due to malaria or dysentery. For mild cases, use *Weiling Wan*; for severe cases, use *Jiawei Weiling Wan*. For wind-cold induced swelling without fever, use *Wuling San* added with *Rougui* to restore Bladder Qi transformation, allowing free urination and subsiding edema.

For Yang-type edema, characterized by fever, constipation, scanty dark urine, irritability, and thirst, administer *Hengxie Dan* delivered by *Wupi Yin* to induce mild purgation.
For Yin-type edema, characterized by absence of fever, no thirst, cold body, aversion to cold, and normal bowel/bladder function, use *Pingwei San* added with *Fuling*, *Caoguo*, *Muxiang*, and *Huoxiang*. Edema starting in the abdomen and spreading to the limbs is treatable; edema starting in the limbs and returning to the abdomen is difficult to treat. If a child has inherent Yuan Qi deficiency and develops generalized edema, cold limbs, no thirst, clear long urination, loose stools, and anorexia after a severe illness, this represents extreme Yin-cold and impending collapse of Spleen-Stomach Qi. None of the standard edema formulas should be used; instead, use *Liujunzi Tang* added with *Rougui*, *Paojiang*, *Sharen*, and *Baiko* to rescue the Spleen-Stomach Qi. Ignorant physicians seeing only swelling, unaware of the exhaustion of Yuan Qi, continue to use digestive and diuretic drugs, or employ drastic purgatives like *Zhouche Wan*, *Yugong San*, *Daji*, *Yuanhua*, and *Gansui*. This is akin to murder; caution is urged.

*Jiawei Weiling San* (See Diarrhea section):
Based on the original formula of *Weiling Wan*. Add slight amounts of *Mahuang* for early facial/head swelling; add *Sangbaipi* and *Xingren* for wheezing; add *Mutong* for yellow-red urine; add *Wujia Pi* for generalized swelling; add *Sharen*, *Baiko*, *Dingxiang*, and *Zhike* for abdominal distension; add *Fuzi*, *Rougui*, and *Fangji* for cold feet.

*Wuling San* (See Cough section).
*Wupi Yin* and *Hengxie Dan* (See Dampness Injury section).

*Jiawei Sijunzi Tang*:
*Renshen* (1 qian), *Baizhu* (1 qian), *Fuling* (1 qian), *Rougui* (0.5 qian), *Paojiang* (0.5 qian), *Sharen* (0.6 qian), *Baiko* (0.6 qian), *Gongdingxiang* (0.7 qian), *Zhi Gancao* (1 qian), *Dazao* (1 piece).

*Pingwei San*:
*Cangzhu* (1 qian), *Chenpi* (1 qian), *Nanxing/Pohu* (0.6 qian - Note: Text says Nongpu, likely Nanxing or Houpo variant, usually Houpo/Nan Xiang in context but text says Nongpu), *Gancao* (1 qian). *Correction based on standard Pingwei San*: Cangzhu, Chenpi, Houpo, Gancao. Text specifies "Nongpu" which is likely a typo for Houpo or refers to processed Houpo. I will translate as listed but note standard term. Let's stick to text: *Nongpu* (processed Magnolia bark).

*Maijing* (Classic of Pulse) states: For edema pulse, floating and large pulses indicate easier recovery; deep and fine pulses indicate difficult recovery. Zhou Mengjue said: I believe that if a physician does not carefully examine the pulse and symptoms, treatment is already difficult. If the pulse is clear and symptoms accurate, a floating-large pulse guarantees success, but a deep-fine pulse does not necessarily mean incurable. In my youth, I suffered from edema and recovered. To understand the life-and-death distinctions of edema, let me share my experience. Water ingested enters the Stomach; its transformation relies entirely on the Spleen, Lung, and Kidney meridians. The Spleen governs transportation; the Lung regulates water passages; the Kidney governs steaming and evaporation. Thus, clouds rise and rain falls, seeping into the Bladder. If these three organs lose their authority, Qi fails to transform, water accumulates in the central region, flows horizontally to the limbs, and floods the skin. The entire body is infused with water. Regarding deep-fine pulses: a deep-fine pulse indicates deeper disease invading the Zang organs. Even with deep-fine pulses, differentiate Yin and Yang by symptoms. For Yin edema: cold damage to Lung, cold-damp invading Spleen, deficiency-cold damaging Kidney, loose stools, clear urination, deep-fine-slow pulse. Tonify Earth to warm Metal; use *Shipi Tang*, truly a blessing for the world. Strengthen Water and supplement Fire; use *Shenqi Tang*, capable of reversing destiny. For Yang edema: Fire excess suppressing Metal, heat depression insulting Earth, dryness depleting Water, hard stools, yellow-red urine, deep-fine-rapid pulse. *Shigao* paired with *Maidong* is sufficient in Materia Medica as a lever for treating water; *Huanglian* accompanied by *Huangbai* acts as a rhinoceros horn for dividing water in medical formulas. I have treated cases where both Yin and Yang were reversed, which are unfathomable. Yang-water reversal is ten times worse than Yin-water. Misusing Yang-treatment for Yin-water leads to hoarseness and death; misusing Yin-treatment for Yang-water leads to hematemesis and death. Regarding floating-large pulses, the pathogen is still at the exterior, the shallowest stage. Water accumulated in the Bladder can be cleared with *Wupi Yin*; water moving in the muscle layer can be opened via the "Ghost Gate" (sweat pores) using *Yebip Tang*. Cases where morning relief occurs with evening urgency, or vice versa, reflect water following Qi ascent and descent; why attribute this to Yin deficiency or Yang depletion? Panting and difficulty lying down at night indicate water overflowing into Lung lobules; why attribute this to Mother-Child relationship issues? Whether called Fengshui, Shishui, or Pishui, these are names of water. Whether called Shizhong, Xuezhong, or Fengzhong, they are all edema. Analyzing pulse and symptoms, differentiating Zang-Fu, whether deep-fine or floating-large, there is no difference in difficulty. Judging reason and circumstance, these are merely previous words; speaking from the heart, these are words of survival after disaster. Treating this syndrome is indeed arduous yet fortunate. Worry turns hair white by three thousand zhang; having crossed eighteen rapids of great waves.

*Mengjue Shipi Tang*:
*Jiaozhu* (1 qian), *Fuling* (1 qian), *Zhi Gancao* (1 qian), *Nongpu* (0.6 qian), *Rougui* (0.5 qian), *Guokou* (0.7 qian), *Mugua* (1 qian), *Muxiang* (0.5 qian), *Fupian* (0.3 qian), *Ganjiang* (0.5 qian), *Dazao* (1 piece).

*Quankui Shenqi Wan* (i.e., *Guifu Dihuang Tang*):
*Shudi* (3 qian), *Shanyao* (1 qian), *Fuling* (1 qian), *Yurou* (1 qian), *Zexie* (1 qian), *Danpi* (1 qian), *Rougui* (0.5 qian), *Fupian* (0.3 qian).

*Mengjue Maidong Tang*:
*Shigao* (1 qian), *Maidong* (1 qian), *Jingmi* (1 qian), *Zhi Gancao* (1 qian), *Shengjiang* (1 qian), *Dazao* (1 piece).

*Mengjue Lianbai Tang*:
*Huanglian* (1 qian), *Yimi* (1 qian), *Huangbai* (1 qian), *Qiancao/Cheqian* (1 qian - Text says Cheqian), *Rougui* (0.5 qian), *Zhimu* (1 qian), *Zhi Cao* (1 qian).

*Zhongjing Yebip Tang*:
*Shigao* (1 qian), *Mahuang* (1 qian), *Zhi Gancao* (1 qian), *Shengjiang* (1 qian), *Dazao* (1 piece).

Tu Weisheng stated: Edema is like ancient floods, spreading across fields without boundary. At such times, tonifying Spleen to drain water or warming Kidney to transform water are merely dam-building approaches, inferior treatments. It is better to follow Yu the Great’s method of dredging channels and guiding water to the sea. Excluding Wind-swelling and Deficiency-swelling, Yang-type water should use *Ejiao Dahuang Gansui Tang* to save Yin from Yang. Yin-type water should use *Shizao Tang* and *Wupi San* to save Yang from Yin. Although these formulas are harsh, against towering waters, no other agents can subdue them except these fierce prescriptions. After purgation, use *Liujunzi Tang*, *Sijunzi Tang*, or *Liuwei Dihuang Tang* for convalescence to avoid lingering complications. Although salt intake is a major taboo in edema, this treatment method permits it. However, for severe cases, placing salt in a jar, sealing tightly, and roasting it is advisable. (Note: Edema is easily confused with Wind-swelling and Qi-swelling. Wind/Qi swelling rebounds immediately upon pressure; edema sinks deeply upon pressure. This is the distinction.)

*Qukui Ejiao Dahuang Gansui Wan*:
*Ejiao* (2 qian), *Dahuang* (1 qian), *Gansui* (0.7 qian).
These three ingredients: dissolve Ejiao and form pills the size of mung beans. Adults take 6-7 pills initially; if ineffective, gradually increase to 10-20 pills. Children take 2-3 pills initially; if ineffective, gradually increase to 7-9 pills. Dosage must be adjusted according to the patient's constitution.

*Shizao Tang* (See Cough section).