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The *Yellow Emperor's Inner Canon* states: All swellings and fullness caused by dampness belong to the Spleen. It also says: Wind and rain injure the upper part of the body, while cold and dampness injure the lower part. Chen Feixia stated: The disease of dampness arises from four sources. One is from the heavenly qi, such as rain and dew. Another is from the earthly qi, such as mud and water. A third is from diet, such as wine, beverages, and raw or cold foods. The fourth is from human activities, such as sleeping in sweat-soaked clothes, lying on wet surfaces, like infants bathing, contact with fecal matter, or dryness not being achieved in swaddling clothes. Although the causes differ, they all stem from the deficiency of Spleen Qi. The key to differentiation and treatment lies in only two aspects: one is Damp-Heat (Shi Re), and the other is Cold-Damp (Han Shi). This covers it all. When the illness presents with fever, it is called Damp-Heat. When the illness presents with excessive cold, it is called Cold-Damp. The treatment for Damp-Heat should be clearing and draining; when heat is removed, dampness is also removed. The treatment for Cold-Damp should be drying and warming; without warmth, dampness cannot be dried.

For Damp-Heat syndrome, symptoms include fever, body pain, frequent thirst, red and scanty urine, constipation, and a surging and slippery pulse; this constitutes a Heat syndrome. The appropriate method is clearing and draining, using formulas such as Chai Ling Tang (Bupleurum and Poria Decoction) or Yin Chen Yin (Artemisia Capillaris Drink). If Damp-Heat is severe, or if the Yuan Qi is robust with accompanying constipation, pushing and purging methods may be used, such as Hangxie Dan from *Yizong Jicheng*. Cold-Damp syndrome manifests as abdominal distension, diarrhea, and vomiting; these are diseases of Cold-Damp. Whenever children play with cold water or sit/lie on wet ground, presenting with headache, heavy body, and alternating chills and fever, Wei Ling Tang (Stomach-Ling Formula) is appropriate. If accompanied by vomiting, add Huoxiang (Patchouli Herb) and Sharen (Amomum Fruit). If edema results from dampness invasion, combine Wei Ling Tang with Wu Pi Yin (Five Peel Decoction). If ineffective, warm tonification must be used, waiting for Yang Qi to gradually recover, selecting from Lizhong Tang (Regulate the Middle Decoction) or Bawei Wan (Eight-Ingredient Pill) as appropriate. Generally, Spleen deficiency leads to many damp diseases. Internal causes include stagnation of yeast/wine residue, craving fruits and melons, preference for raw/cold foods, and roasted/fatty/sweet foods, leading to accumulation and overflow of Damp-Heat; this is an internal cause. External causes include sitting/lying on wet ground, invasion by fog/dew/rain, pores closed by wind during bathing, or mud/water dampness郁stagnating in the cou-li (interstitial spaces), leading to jaundice; this is dampness generated externally.

Thus, both internal and external dampness invasions occur due to Spleen Qi deficiency, allowing damp pathogens to attack. For jaundice caused by dampness invasion, use Yinchen Wuling San (Artemisia Capillaris and Five-Ingredient Poria Powder); if ineffective, use Liujunzi Tang (Six-Gentlemen Decoction). Drying the Spleen Earth will naturally make the yellow color recede. *Yizong Jicheng*'s Ziling Tang treats dampness invasion with aversion to heat resembling malaria.
Dangshen (Codonopsis Root), Chaihu (Bupleurum Root), Huangqin (Scutellaria Root), Banxia (Pinellia Tuber), Baizhu (Atractylodes Rhizome), Fuling (Poria), Zhuling (Polyporus), Zexie (Alisma Rhizome - 1 qian), Guizhi (Cinnamon Twig - 5 fen), Zhigancao (Honey-fried Licorice Root - 1 qian), Shengjiang (Fresh Ginger - 1 qian), Dazao (Jujube - 1 piece).

*Yizong Jicheng*'s Chaixie Dan treats all heat syndromes in infants and children, such as fetal toxin, thrush, double tongue, tonsillar swelling, constipation, tinea, scabies, and wind-heat.
Chuanxiong (Ligusticum Rhizome - 9 qian, wine-washed), Dahuang (Rhubarb Root - 9 qian), Huangqin (Scutellaria Root - 9 qian, wine-washed), Huangbai (Phellodendron Bark - 9 qian, wine-washed), Heiqianniu (Black Morning Glory Seed - 6 qian, stir-fried, head and tail removed), Bohe (Mint Leaf - 4.5 qian), Huashi (Talcum - 6 qian, water-ground), Binglang (Areca Seed - 7.5 qian, washed and dried in child's urine), Zhiqiao (Bitter Orange Fruit - 0.45 qian, flour-fried), Lianqiao (Forsythia Fruit - 0.6 fen, heart removed), Chishao (Red Peony Root - 0.6 fen, stir-fried).
Grind into powder, form pills with honey the size of Euryale Seed. Infants within one month take one pill; older infants take two pills. Dissolve in tea or broth. Nursing mothers must avoid greasy food. Stop when mild diarrhea occurs and the illness resolves.

Wei Ling Tang (see Diarrhea formula above). Treats dampness invasion causing heavy head and alternating chills and fever.
*Yizong Jicheng*'s Yincheng Yin treats dampness-induced jaundice with obstructed urination and defecation.
Yinchen (Artemisia Capillaris Herba - 2 qian), Zhizi (Gardenia Fruit), Chi Fuling (Red Poria), Tiantingli (Descurainia Seed), Gancao (Licorice Root), Dengxincao (Juncus Medulla) (each 1 qian), Xiao Zhishi (Immature Bitter Orange - 0.7 fen).

Wu Pi Yin combined with Wei Ling Tang specifically treats edema.
Shengjiang (Fresh Ginger), Dafupi (Areca Peel), Fuling (Poria), Sangbaipi (Mulberry Root Bark), Wujiaopi (Acanthopanax Bark), Dengxincao (Juncus Medulla), Dazao (Jujube) (each 1 qian).

Yinchen Wuling San treats dampness-induced jaundice.
Yinchen (Artemisia Capillaris Herba - 2 qian), Baizhu (Atractylodes Rhizome), Fuling (Poria), Zhuling (Polyporus), Zhigancao (Honey-fried Licorice Root), Shengjiang (Fresh Ginger) (each 1 qian), Guizhi (Cinnamon Twig - 5 fen), Dazao (Jujube - 1 piece).

Tu Weisheng said: Dampness is contrary to Dryness. Dampness is the qi of Water and Fire interacting; Dryness is the qi of Water and Fire not interacting. However, Spleen Earth requires Dampness to moisten and transform the hardness of food and drink; it requires Dryness to consume and dissolve the yin of food and drink. Thus, although Dryness and Dampness are opposite, they actually generate and assist each other. To keep Spleen Earth healthy, one must balance its Dryness and Dampness. Excessive Dampness leads to stagnation and cold, causing swellings, coughs, vomiting, and diarrhea. Accumulated Dampness turning into Heat causes red/yellow face and eyes, chest fullness, and rebellious Qi. Therefore, treatments for Damp-Cold focus on warming and drying, while treatments for Damp-Heat focus on clearing and draining. Although Dryness and Dampness are far apart, and Clearing and Dampness are close, making them balanced in rigidity and softness makes them excellent generals for treating dampness. The *Canon* states: Spleen Earth likes Dryness and dislikes Dampness. It also says: Above Taiyin, Dampness governs; internally connected to Yangming. Interpreters, because Spleen dislikes Dampness, argue that Dampness is unnecessary; regarding "internally connected to Yangming," they restrict it to being a collateral branch of Taiyin running along Yangming meridians. This misses half the comprehensive understanding of treating dampness. I believe "internally connected to Yangming" is not just about collaterals. It means that although Dampness governs above Taiyin, it does not necessarily cause Dampness disease. The question is: what is the middle way in its treatment? Answer: To achieve harmony, one must observe how Yangming Qi behaves, then determine how to treat Dampness. Yangming Qi takes Dryness as its root; its harmony also takes Dryness as its root. Only thus can there be harmony, and only thus can there be no disharmony. Later scholars have not revealed this subtle meaning, but those who know to treat dampness with Dryness have fully comprehended the profound method of the sages.