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Pathogenic dampness manifests as diseases scattered across various categories. Here, the origins and mechanisms of dampness are explained in detail so that treatment will not be erroneous. Dampness may invade from the exterior or originate from within. Invasion from the exterior occurs, for instance, when walking in rain, dwelling in mist and dew, or having cold water poured over sweat; this is dampness entering from above. Wading through water, stepping on ice, washing feet in the wind, or sitting and lying on damp ground results in dampness entering from below. In the initial stage, pathogenic dampness resides in the meridians and has not yet stagnated to transform into heat. The patient merely feels cold pain in the bones or slight swelling of the skin and flesh, with mild aversion to cold. The pulse is fine and slow (Xì Huǎn) rather than surging and rapid (Hóng Shù), indicating a pattern of Cold-Dampness (Hán Shī). All such cases should be treated with modifications of Renshen Baidu San (Ginseng Detoxification Powder). If dampness remains for a long time, it obstructs the body's righteous qi and transforms into Damp-Heat (Shī Rè). The pulse becomes surging, slow, rapid, or large, whereas the previous fine and slow pulse disappears. Observing redness, swelling, soreness, and pain in the upper or lower parts of the body, accompanied by aversion to cold and fever, indicates Damp-Heat. Although releasing the exterior is appropriate, acrid-cool herbs should be used rather than acrid-warm ones. For example, Chaige Ermiao Tang (Bupleurum and Pueraria Two Marvels Decoction) can be applied to both upper and lower regions. If chills and fever have subsided but redness and swelling persist, Jiachai Ling Tang (Modified Bupleurum and Poria Decoction) is indicated. The *Neijing* states, "In treating dampness, if diuresis is not employed, it is not the correct method." Thus, promoting urination is the second most important principle in treating dampness. However, methods of diuresis must be chosen carefully: if dampness exists, promote dampness; if no dampness exists, diuretics will damage body fluids. Diuretics may be used for severe edema, but for mild swelling accompanied by flaccidity and weakness, one should eliminate dampness and nourish Ying (Nutritive Qi). The *Neijing* says, "Due to dampness, the head feels as if wrapped," meaning that when dampness initially invades and has not yet transformed into heat, the patient feels mental cloudiness, as if the head were wrapped in something. It also states, "The large tendons become soft and short, the small tendons become lax and long." This implies that when dampness lingers, it stagnates and transforms into heat; heat damages blood, causing the large tendons to become soft and shortened, while dampness damages the tendons, causing the small tendons to become lax and elongated. Understanding these statements reveals that treating dampness should not rely excessively on drying agents. This describes dampness invading from the exterior.

Regarding dampness originating from within, there are differences between the upper and lower jiao. For example, tea, wine, soups, and waters that the spleen fails to transport and transform due to deficiency accumulate in the Upper Jiao, forming Upper Jiao Dampness. Patients present with swelling of the head and face or develop maculopapular rashes (Yin Zhen). This represents heat arising from dampness; treatment requires cooling and dispersing rather than warming and dispersing. Chaige Ermiao Tang is also used. If the patient experiences difficulty in urination, making it hard for upper dampness to descend, Chai Ling Tang (Bupleurum and Poria Decoction) should be used to promote urination. If the pulse is fine, slow, and forceless, urine is clear, and there is frequent dribbling urination with profuse sweating, all diuretic drugs are contraindicated. In cases where the body is hot but the feet are cold, with intermittent heat in the head and flushed face, this indicates Damp-Heat congesting upward, preventing Yang Qi from descending to communicate with Yin. Chai Hu Tang (Bupleurum Decoction) with added Da Huang (Rhubarb) should be used to purge downward. Accumulation of dampness in the lower part forms Lower Jiao Dampness, which can be treated with Chai Ling Tang to promote urination. If the patient has aversion to cold and fever, or if the radial pulses at both chi positions are surging and full while other pulses are deep and fine, this indicates Damp-Heat congesting downward, preventing Yin Qi from ascending to communicate with Yang. One must use Chaige Ermiao Tang to disperse the superficial pathogens before promoting urination. If the pulse is fine and slow and the urine is clear, Du Huo Ji Sheng Tang (Angelica Pubescens Decoction for Sustaining Life) is indicated to assist Yang Qi in driving out dampness; this is an indispensable method.

Renshen Baidu San (Ginseng Detoxification Powder)
Qiang Huo (Notopterygii Rhizoma et Radix), Du Huo (Angelicae Pubescentis Radix), Chai Hu (Bupleuri Radix), Qian Hu (Peucedani Radix), Chuan Xiong (Ligustici Chuanxiong Rhizoma), Zhi Ke (Aurantii Fructus), Jie Geng (Platycodonis Radix), Ren Shen (Ginseng Radix), Bai Fu Ling (Poria), Gan Cao (Glycyrrhizae Radix et Rhizoma).
For severe cold, add Gui Zhi (Cinnamomi Ramulus). If Ren Shen is unavailable, substitute with Bai Zhu (Atractylodis Macrocephalae Rhizoma).

Chaige Ermiao Tang (Bupleurum and Pueraria Two Marvels Decoction)
Chai Hu (Bupleuri Radix), Huang Qin (Scutellariae Radix), Ban Xia (Pinelliae Rhizoma), Gan Cao (Glycyrrhizae Radix et Rhizoma), Gan Ge (Puerariae Lobatae Radix), Chi Shao (Paeoniae Radix Rubra), Cang Zhu (Atractylodis Rhizoma), Huang Bo (Phellodendri Cortex).
Damp-Heat patterns often present with surging and rapid pulses, though dampness stagnation may present with deep, fine, and slow pulses. If the patient reports internal restlessness with fever, this formula is used to disperse the pathogen. For patterns located in the upper jiao, remove Huang Bo and add Lian Qiao (Forsythiae Fructus).

Jiachai Ling Tang (Modified Bupleurum and Poria Decoction)
Chai Hu (Bupleuri Radix), Huang Qin (Scutellariae Radix), Ban Xia (Pinelliae Rhizoma), Gan Cao (Glycyrrhizae Radix et Rhizoma), Chi Fu Ling (Poria cum Rubro), Ze Xie (Alismatis Rhizoma), Chi Shao (Paeoniae Radix Rubra), Zhi Ke (Aurantii Fructus), Yi Yi Ren (Coicis Semen), Mu Gua (Chaenomelis Fructus).

Chushi Yangrong Tang (Dampness-Eliminating and Nutritive-Qi-Nourishing Decoction)
Dang Gui (Angelicae Sinensis Radix), Chuan Xiong (Ligustici Chuanxiong Rhizoma), Bai Shao (Paeoniae Radix Alba), Shu Di Huang (Rehmanniae Radix Preparata), Niu Xi (Achyranthis Bidentatae Radix), Du Zhong (Eucommiae Cortex), Mu Gua (Chaenomelis Fructus), Yi Yi Ren (Coicis Semen), Xu Duan (Dipsaci Radix), Huang Qin (Scutellariae Radix), Shi Hu (Dendrobii Caulis), Wu Jia Pi (Acanthopanacis Cortex).

Jiawei Chai Hu Tang (Modified Bupleurum Decoction)
Chai Hu (Bupleuri Radix), Huang Qin (Scutellariae Radix), Gan Cao (Glycyrrhizae Radix et Rhizoma), Hua Fen (Trichosanthis Radix), Bai Shao (Paeoniae Radix Alba), Mai Dong (Ophiopogonis Radix), Shan Zhi (Gardeniae Fructus), Da Huang (Rhei Radix et Rhizoma).

Du Huo Ji Sheng Tang (Angelica Pubescens Decoction for Sustaining Life)
Dang Gui (Angelicae Sinensis Radix), Chuan Xiong (Ligustici Chuanxiong Rhizoma), Bai Shao (Paeoniae Radix Alba), Shu Di Huang (Rehmanniae Radix Preparata), Ren Shen (Ginseng Radix), Fu Ling (Poria), Gan Cao (Glycyrrhizae Radix et Rhizoma), Du Zhong (Eucommiae Cortex), Niu Xi (Achyranthis Bidentatae Radix), Xu Duan (Dipsaci Radix), Qin Jiao (Gentianae Macrophyllae Radix), Fang Feng (Saposhnikoviae Radix), Du Huo (Angelicae Pubescentis Radix), Xi Xin (Asari Radix et Rhizoma), Rou Gui (Cinnamomi Cortex), Sang Ji Sheng (Taxilli Caulis et Folium).
(Note: This formula focuses on assisting Yang Qi to expel dampness. Clear urine and a pulse that is faint at the chi position and slow at the cun position indicate its precise indication. If Damp-Heat is not fully resolved, careful consideration is required to avoid the error of adding fuel to the fire.)