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The *Yellow Emperor's Inner Classic* states: "Various swellings and abdominal fullness caused by dampness all belong to the Spleen." The dampness of the earth, when it invades the human body, harms the skin, flesh, sinews, and vessels. The Yang meridians are affected by wind, while the Yin meridians are affected by dampness. The lower half of the body is where dampness strikes. Those injured by dampness first suffer from below. A voice that sounds muffled, as if coming from a room, indicates dampness in the Middle Jiao (middle burner). When dampness prevails, it leads to loose stools (diarrhea with watery consistency). Due to dampness, the head feels wrapped or heavy. If damp-heat is not eliminated promptly, the large tendons shorten, and the small tendons relax and lengthen. Shortening of the large tendons causes spasms (contracture), while relaxation of the small tendons leads to flaccidity (weakness and atrophy). Swelling due to Qi stagnation, with symptoms alternating among the four limbs, results in the exhaustion of Yang Qi.

The head is the meeting place of all Yang meridians; its position is high, its Qi is clear, and its structure is hollow, so hearing and vision ("brightness") depend on it. However, if steamed by the exclusive damp-earth Qi, the clear orifices become blocked, leading to heaviness and dysfunction, as if something were covering the head. If left untreated, dampness stagnates and transforms into heat. Persistent heat damages blood, preventing it from nourishing the tendons, thus causing spasms. Dampness damages the tendons, preventing them from binding the bones, thus causing weakness and flaccidity. If one has a pre-existing Qi disorder, compounded by damp-heat, the struggle between Qi, dampness, and heat causes swelling. The Qi of all Yang meridians originates in the four limbs. Today, people often mistakenly treat knee joint pain and swelling solely as Wind pathogens.

Wind, Cold, and Summer-heat can all invade humans, but only Dampness, after accumulating for a long time and lingering in the joints, can deeply penetrate. It is not as sudden as Wind, Cold, or Summer-heat. External invasion of dampness may occur due to mountain miasma, rainy weather humidity, wading through water during travel, or lying on damp ground for a long time. Symptoms include painful and heavy joints, heavy head and body pain, abdominal distension and stifling sensation, coma, limb fatigue, swollen and painful legs and knees, heavy body and edema, diarrhea, and yellow-red urine. Qianghuo Shengshi Tang (Notopterygium Decoction for Overcoming Dampness) is indicated. If the whole body aches, indicating Wind-Dampness struggling, Chufengshi Qianghuo Tang (Decoction for Removing Wind-Dampness with Notopterygium) is used. For limb pain, heavy head, nasal congestion, diarrhea, or bloody stools, indicating Wood-Wind pathogen interfering with Earth-Dampness, Shenzhu Tang (Atractylodes Macrocephala Decoction) is prescribed. For damp-toxin causing bloody stools, diarrhea, and heavy limbs, Shengyang Chushi Fangfeng Tang (Decoction for Raising Yang and Draining Dampness with Saposhnikovia) is used. If heaviness is concentrated below the waist, indicating dampness blocking the meridians, Shen Shi Tang (Decoction for Percolating Dampness) is applied.

However, there are differences between "injury" (Shang) and "strike" (Zhong) by dampness. Injury by dampness involves the Foot-Taiyang Bladder Meridian; strike by dampness involves the Foot-Taiyin Spleen Meridian or Foot-Shaoyin Kidney Meridian. Injury to the Bladder causes irritability, thirst with desire to drink, difficult urination, and swelling; Wuling San (Five-Ingredient Powder with Poria) is used. Dampness lodging in the Spleen causes edema of the four limbs, inability to flex and extend, and frequent loose stools, caused by damage from rich foods, alcohol, and internal dampness; Chushi Tang (Dampness-Removing Decoction) is used. Dampness lodging in the Kidney causes lower back pain, heavy body, and difficult urination, caused by sleeping on damp ground after drunkenness or wearing wet clothes externally; Shen Zhuo Tang (Kidney-Lodging Decoction) is used. For dampness causing body pain, difficult urination, heavy body, and thirst, Wuling San plus Qianghuo (Notopterygium) is used. For dampness located above and outside, slight sweating should be induced using Qianghuo Shengshi Tang; for dampness located below and inside, diuresis should be promoted using Wuling San. Li Dongyuan stated: "To treat dampness without promoting urination is incorrect treatment." However, over-treatment must be avoided. Once 60-70% of the disease is resolved, transition to Spleen-regulating formulas. Just as land remains wet even after water drains, excessive use of diuretics depletes Kidney Water.

Luo Qianfu said: In the transition between Spring and Summer, symptoms resembling Taiyang syndrome (cold damage) occur, with spontaneous sweating, heavy and painful limbs, difficulty turning, and difficult urination. This is named Wind-Dampness, not cold damage. After rainy days or excessive drinking, this pattern is common. Frequent use of Wuling San promotes urination; once dampness is removed, recovery occurs. Diarrhea-inducing or sweating methods are strictly contraindicated; minor errors here can be fatal. Chu Yushi noted that doctors misdiagnosing this as Wind-Cold and inducing sweating or purgation caused deaths during the epidemic in the capital in the Jiwei year. Luo Qianfu's method saved many. Generally, Wuling San separates fluids and removes dampness; it is excellent for fluid retention in the chest and pediatric vomiting threatening epilepsy, because Guizhi (Cinnamon Twig) disperses Liver-Spleen stagnation. Dai Fu'an stated: Zhang Zhongjing originally used Wuling San for dampness invading the interior after sweating in Taiyang syndrome. It is most suitable for Wind-Dampness with spontaneous sweating, heavy painful limbs, thirst, and difficult urination. If there is no thirst or difficult urination, the pathogen remains in the meridians; Qianghuo Shengshi Tang or Chufengshi Qianghuo Tang should be selected, without rigid adherence to previous statements.

Zhang Yuansu (Zihehe) said: In summer, pores are open, and Yuan Qi is not closed, making one susceptible to Wind and Dampness. Sweating followed by wind exposure causes Wind-Dampness. Pre-existing heat combined with dampness causes Damp-Heat. Long-standing dampness also transforms into heat. Pre-existing deficiency of Yuan Qi combined with dampness causes Cold-Dampness. Whether acquired from earth, heaven, or dairy/alcohol, treatment must differentiate. For Wind-Dampness, Xiao Jianzhong Tang plus Huangqi (Astragalus), Baizhu (Atractylodes), Qianghuo, and Fangfeng is used. For Damp-Heat, Linggui Zhugan Tang (Poria, Cinnamon Twig, Atractylodes, Licorice Decoction) is used. For Cold-Dampness, Xiao Qinglong Tang modified is used. For Yang deficiency, remove Mahuang (Ephedra) and add Shu Fuzi (Prepared Aconite) and Baizhu, or use Mahuang Jia Zhu Tang (Ephedra Plus Atractylodes Decoction). For damp patients with no sweat and body pain, Mahuang Jia Zhu Tang is used. For dampness complicated by Wind, causing dizziness, vomiting, fever, aversion to wind, slight forehead sweating, or mild edema, Ma Xing Yi Gan Tang (Ephedra, Apricot Kernel, Coix Seed, Licorice Decoction) or Qianghuo Shengshi Tang is used to induce slight sweating. Profuse sweating leaves dampness behind. If fever persists after sweating, Baidu San (Rescue the Hundred Decoction) plus Cangzhu (Atractylodes Lancea) and Fangji (Stephania) is used. For dampness complicated by Cold, causing curling pain, no sweat, and severe pain, Wuji San (Five Accumulations Powder) is used. For Wind-Dampness with floating pulse, heavy body, sweating, and aversion to wind, Fangji Huangqi Tang (Stephania and Astragalus Decoction) is used. For Wind-Dampness struggling, causing heavy painful body, inability to turn, no vomiting/thirst, and floating-deficient-choppy pulse, Guizhi Fuzi Tang (Cinnamon Twig and Aconite Decoction) is used. If stool is hard and urination is normal, Baizhu Fuzi Tang (Atractylodes and Aconite Decoction) is used. For painful joints, inability to flex/extend, pain upon touch, sweating, shortness of breath, difficult urination, aversion to wind, or mild edema, Gancao Fuzi Tang (Licorice and Aconite Decoction) is used.

Yu Jiayan stated: Excess Yang makes the body light; excess dampness makes it heavy, even as heavy as mountains, with pain preventing movement. At this stage, Fuzi (Aconite) must be used to restore Yang and overcome dampness. For exterior dampness amenable to sweating, combine Fuzi with Guizhi Tang to expel outward. For interior dampness amenable to purgation, combine Fuzi with Xixin (Asarum) and Dahuang (Rhubarb) to expel downward. For middle dampness, combine Fuzi with Baizhu to warm the center and dry Spleen dampness. Using Baizhu mixed with Qianghuo, Fangfeng, Zhishi, Houpo, Zhizi, or Chenpi is ineffective. Using Binglang (Betel Nut), Huashi (Talc), Zhouche Wan, or Daoshui Wan is even worse. Damp patients must not be sweated profusely, as they already sweat easily, risking Yang collapse. Mis-sweating in Wet-Warmth is called "Chong Yue" (Double Muggy Heat) and is strictly forbidden. However, if Yang is depressed by prolonged wind/cold and water washing, slight sweating is necessary. Promoting urination is the general rule for dampness. But in patients with deficient True Yang, scanty dripping urine after sweating indicates exhaustion of True Yin and impending Yang collapse. Mistaking this for Damp-Heat and aggressively diuresing will cause immediate death due to lack of Yin anchoring Yang.

Jia Zhen Sun stated: Dampness is Earth Qi; Heat generates Dampness. Thus, summer heat brings moisture, while autumn coolness brings dryness. Dampness does not arise spontaneously but stagnates due to Heat obstructing water pathways. People with robust bodies but weak Qi are susceptible. People know the severity of Wind-Cold but ignore the insidious nature of Summer-Heat and Dampness. The *Yuan Bing Shi* states: "All spasms and stiff necks belong to Dampness." Edema with cold and water qi, accompanied by scanty red urine or thirst, indicates deep internal Heat accumulation, not Cold. Treatment prioritizes regulating Spleen, clearing Heat, and promoting urination. "Treating dampness without promoting urination is incorrect." There are two types of dampness: Damp-Heat (common) and Cold-Damp (rare). Slippery-rapid pulse with red/scanty urine, thirst, and sweating indicates Damp-Heat. Normal clear urine, diarrhea, body ache, and no sweat indicate Cold-Damp. Yellow skin like orange peel with difficult urination and mild abdominal fullness requires Yinchen Hao Tang (Artemisia Capillaris and Gardenia Decoction). Yellow skin with difficult urination and thirst requires Wuling San plus Yinchen. Stifling heat, difficult urination, and thirst require Guiling Ganyin Tang (Cinnamon, Poria, and Hydrangea Drink). Struggling Damp-Heat requires Qingre Shen Shi Tang (Clear Heat and Percolate Dampness Decoction). Heavy shoulder/back pain, upper heat/chest oppression, and generalized pain indicate external Damp-Heat; Dangni Tongtong Tang (Angelica and Ligusticum Pain-Relieving Decoction) is used. For chronic Yin deficiency with fire and seminal emission, dampness attacks the essence orifice; Hujian Wan (Tiger Knee Pill) or Dangni Tongtong Tang plus Guiban (Turtle Shell), Baizhu, and Muli (Oyster Shell) is used. Internal Damp-Heat causing edema and difficult urination requires Wuling San or Shenxiong Wan, graded by severity, followed by Spleen-fortifying agents. Yin-type edema is detailed elsewhere.

Shi Wan stated: Ancient texts did not detail Damp-Heat extensively until Zhu Danxi. However, his theories derived from Li Dongyuan's Bi syndrome formulas, focusing on symptoms rather than root causes. Reading Zhang Zhongjing's *Pi Lun* reveals root treatments for Damp-Heat. Post-cold damage improper purgation causes Pi (glomus/fullness), sometimes without purgation, due to Phlegm-Qi rebellion. Zhang Zhongjing established Xiexin Tang (Drain the Epigastrium Decoctions) to clear rebellious Damp-Heat. Many conditions stem from Damp-Heat:鼓胀 (drum-like distension), edema, vomiting, acid regurgitation, jaundice, dysentery, lower back/leg heaviness, and Hong Kong foot (podagra/bi syndrome). These have specific causes but are manifestations of Damp-Heat. Robust, dark-complexioned individuals and drinkers often harbor latent Damp-Heat. Preventive treatment involves Tiaoqi Lishi agents like Liujunzi Tang plus Huanglian (Coptis), Chenxiang (Agarwood), and Zexie (Alisma). Use Qingzao Tang in Autumn/Winter and Chunze Tang plus Ginger Juice and Bamboo Juice in Spring/Summer to gradually dissipate dampness—this is treating disease before it arises. Around age fifty, Qi and Blood decline, leading to poor appetite, fatigue, epigastric fullness, limb pain, or sudden severe distension, vomiting, and blockage. Early intervention with Kongxian Dan (Controlling Phlegm Pill) 10+ pills is critical; failure to purge leads to death. This targets Damp-Heat Phlegm, distinct from Mangxiao (Mirabilite) or Dahuang. Physicians using aromatic-drying herbs cause death. Chronic diseases exacerbated by Qi deficiency are critical; mis-treatment is fatal. Avoid further medication.

For those with innate Damp-Heat and Yin deficiency (common in pampered elites), emotional stress, alcohol/sex excess, or seasonal damp-heat causes Deficient Fire carrying Phlegm upward. Mild cases: chest/flank fullness, limb weakness. Severe cases: generalized heaviness, phlegm-cough, wheezing, hematemesis, constipation, red face, cold feet, or paralysis. Fat-phlegm constitutions with Yin deficiency present as Upper Excess/Lower Deficiency. Young adults are most affected. Treatment differs from standard Damp-Heat. Wind herbs aggravate Deficient Fire; diuretics deplete Yin; drying herbs exhaust True Yin; pure yin-nourishing herbs increase Phlegm. Balance moistening and drying, rigid and soft. Qingzao Tang and Hujian Wan are appropriate combinations. For Yin-Yang dual deficiency with Lower True Cold and Upper False Heat (manifesting as wheezing, vertigo, limb numbness/heaviness), treat as Lower Cold/Upper Heat to prevent stroke-like symptoms (Phlegm-Fainting, tongue stiffness, drooling, facial deviation, hemiplegia). Liu Wansu's Dihuang Yinzi plus Bamboo Juice and Ginger Juice, followed by Heixi Dan (Black Tin Pill), is effective. After half a day, administer Ren Shen (Ginseng) with Bamboo Juice, Ginger Juice, and Tongbian (Child's Urine) in three doses. For wheezing/sweating, use Shengmai San (Generate Pulse Powder). If delayed, Qi-tonics cannot penetrate. Once Qi stabilizes, use Jisheng Shenqi Wan mixed with Heixi Dan for gradual recovery. Pure Yang deficiency without Yin deficit is rare; dampness converts to Cold. Zhang Zhongjing's Wind/Cold-Damp methods apply. Unlike Yin-deficient Damp-Heat, these are manageable. External-complicated Damp-Heat examples are detailed in the Introduction.

[Diagnosis] Shi Wan stated: Damp pulses are naturally slow. With Wind, they become Floating-Slow; with Cold, Deep-Fine. These are external dampness diagnoses. Dampness striking the Three Yin meridians presents as Deep-Slow, Deep-Fine, or Micro-Slow pulses, treated with Shu-Fu, Jiang-Fu, or Gui-Fu variations. Deep-Slow/Fine are Taiyin/Shaoyin Cold-Damp roots. Weiyuan (Jueyin) Micro-Slow pulse is often misunderstood. Jueyin is Wind-Wood, containing Life-Giving Yang. Even with dampness, internal Wind agitates the pathogen, preventing deep pulses, resulting in Floating-Yang/Slow-Yin imagery. Micro-Slow is the Jueyin root pulse, verifiable in Zhang Zhongjing's Jueyin examples. Dampness in meridions combining with turbid Qi creates Damp-Heat, presenting as Soft-Large pulses. Floating Soft-Large with Slipping pressure indicates Phlegm-Damp in the Stomach. Floating Soft-Large with Choppy pressure indicates Damp injuring Ying-Blood. Differentiation of Cold/Damp-Heat follows these principles.

Luo Qianfu treated a 13-year-old boy who played in floodwaters in June, getting wet. He became lethargic and sleepy. Next day: headache, fever, heavy legs. A physician used harmonizing/dispersing herbs and covered him heavily, causing intense heat and mania. Sweat soaked bedding by 3 AM. Next day: finger tracing, empty grasping. Another physician used Chengqi (Purgative) decoction, leading to mutism, limb paralysis, neck stiffness, convulsions, eyes deviated left with white sclera visible, and lip twitching. Luo diagnosed post-dampness/summer-heat injury, excessive sweating, and erroneous purgation causing Deficient Heat generating Wind and Spasms. He prescribed Baoyuan Tang plus Shengma, Chaihu, Shaoyao, Wuweizi, and Gancao. Within two days, speech returned, limbs relaxed, and appetite improved.

Danxi treated a patient with heavy back sensation (like 200 jin weight) using Shen Zhuo Tang plus Guixin, Zhuling, Zexie, Huangqin, Mutong, and Cangzhu, resulting in cure.

He treated another with waist breaking sensation and cold hips using Chushi Tang plus Fuzi, Banxia, Houpo, and Cangzhu, resulting in cure.

Shi Wan treated Shen Ru's son with extreme pain from knees to feet in summer, unable to flex for 10 days. Topical treatments failed. Pulse was Soft-Large-Rapid. After removing topicals, Dangni Tongtong Tang for two doses induced sweating and cure.