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It is heard that Kun Earth governs dampness, and the damp earth qi thrives in all four seasons, being particularly prominent in spring and summer, and most severe in late summer. People know to avoid wind and cold, but do not know to avoid dampness. The reason one can avoid wind and cold but not dampness is that wind and cold injure the body manifestly and urgently, whereas dampness injures the body insidiously and slowly. Because it is insidious, it is unseen, yet its invasion is deep; because it is slow, it is unnoticed, yet its onset is delayed. Dampness arises from Earth; its original qi belongs to Yin. Yin manifests as cold-dampness, which later gradually transforms into damp-heat. However, Yin qi must obtain Yang qi to ascend. Therefore, in midsummer when heat is intense, dampness is generated, moistening all things. The muggy, steaming dampness rises from below upwards into the great void, forming clouds, mist, rain, and dew. Thus, the transformed qi of dampness becomes "Yin within Yang." This "Yin within Yang" is damp-heat. Damp-heat and warm diseases (Wen Bing) are essentially the same qi with different names. In diseases caused by damp-heat, dampness and heat can still be distinguished as two entities; in warm diseases, dampness and heat merge directly into one. There is heat within dampness, and dampness within heat; this turbid, hot, sticky, and greasy nature is why it is called "warm." Treatment requires distinguishing whether it is the original qi or transformed qi, a separate pathogen or combined pathogen, an external contraction or internal injury. Among external contractions, one must further distinguish whether there are concurrent factors of wind, cold, or summerheat. Among both external contractions and internal injuries, one must distinguish whether dampness predominates or heat predominates, and whether transformation into dryness or fire has occurred.

This involves the sequence of injuring the heavenly qi and earthly qi in the human body, and the depth of entry into the Qi level and Blood level. Generally, the transformed qi of dampness is mostly contracted from above; the pathogen is inhaled through the mouth and nose, thus first injuring the heavenly qi, then affecting the earthly qi. The Classics state: "Injured by dampness, the head feels as if wrapped." It also states: "When dampness is excessive in the upper part, it leads to heat," which refers to this phenomenon. The original qi of dampness is mostly contracted internally, generally due to deficiency of Spleen and Kidney Yang, failing to transform water. Thus, it first injures the earthly qi, then affects the heavenly qi. The Classics state: "All dampness causing swelling and fullness belongs to the Spleen." It also states: "The Kidney governs water; the Kidney is the gate of the Stomach. If the gate is not functioning properly, water accumulates and follows its kind," which refers to this mechanism. The original qi of dampness may also be contracted externally and from below, injuring both heavenly and earthly qi. The Classics state: "When wind-dampness injures humans, Qi and Blood, along with the pathogen, reside together between the muscle intervals and interstices; when cold-dampness injures humans, the skin fails to contract, muscles become firm, Ying Blood becomes stagnant, and Wei Qi departs." It also states: "Yin meridians receive dampness." It further states: "Those injured by dampness receive it first in the lower parts." And again: "Earthly dampness, when encountered, harms the skin, flesh, sinews, and bones," referring to this reality.

Although skin, muscle, meridians, sinews, and bones have form and substance and belong to Earth, their hollow orifices' operation is actually governed by Heavenly Qi. This is the theory of "Heaven enveloping Earth." Between the heaven and earth of the human body lies the diaphragm membrane (Ge Mo). Below the diaphragm, the Liver and Gallbladder are distributed, and the meridians of the San Jiao (Triple Burner, located beside the right kidney) run through. Ministerial Fire (Xiang Huo) resides in the Liver and Gallbladder. When damp pathogens injure the exterior of the Lung, Spleen, and Stomach (the exterior of the Lung is the skin; the exterior of the Spleen is the muscle), the pathogen moves downward. The Liver, Gallbladder, and San Jiao are situated at the critical impact point, blocked above and below by the pathogen, preventing the free flow and spreading of Qi. Consequently, the resident ministerial fire must rise together with damp-heat to cause disease, presenting symptoms such as alternating chills and fever, deafness, bitter taste in the mouth, dry retching, hypochondriac pain, fluid retention, and diaphragmatic pain.

Regarding the area between the front and back of the human body, known as the Membrane Source (Mo Yuan): Due to the stagnating and steaming qi of damp-earth, where dampness contains heat and heat contains dampness, this foul, turbid, sticky, and greasy pathogen rises from the earth, enters via the mouth and nose, heads straight for the central pathway, and spreads throughout the San Jiao. Thus, the Membrane Source is the abyss where pathogens hide, and latent pathogens (Fu Xie) often originate here. (Pathogens injuring the exterior of hair follicles, meridians, and the interior of zang-fu organs usually manifest immediately upon contraction. Only the empty spaces of the Membrane Source, like the cavity within a wall or the abdomen, easily harbor pathogens, manifesting only after a period of time, termed latent pathogens. Warm diseases are latent pathogens. Liu Shouzhen of the Jin Dynasty discussed warm diseases focusing on the San Jiao; Wu Youke of the Ming Dynasty further identified the Membrane Source within the San Jiao. The Membrane Source originates from the *Ling Shu*, and both scholars' theories surpass antiquity.) Latent pathogens often erupt due to wind-cold. After taking medicine to open Lung Qi, the pathogen in the meridians resolves via sweating, giving temporary relief. However, within half a day to a day, the condition suddenly worsens. This is due to the pathogen fermented by the mutual interaction of dampness and heat in the Membrane Source arising from within. At this time, treatment must be guided by the transmission of the pathogen. If transmitting to the exterior, resolve via sweating; if the pathogen is heavily suppressed, resolve via macules and petechiae; if transmitting to the interior, rely on gastrointestinal waste and resolve via defecation. Dampness is a turbid pathogen; returning turbidity to turbidity means transmission to the interior is common. After medicinal action reduces the pathogen, it may recur and transmit after one or two days, cycling repeatedly. Often, multiple purgations are required before the pathogen is fully eliminated, what Wu Youke called the "Nine Transmissions." Rapid progression leads to rapid regression; slow progression leads to slow regression. Those erupting in spring and summer regress quickly; those in autumn and winter regress slowly. Recovery periods vary from two to three pentads (a pentad is five days) for fast cases, to five to seven pentads for slow ones. Such patterns are common in warm diseases, late-onset summerheat-dampness, summerheat-damp malaria, and dysentery, especially in deficient individuals. Let us analyze this in detail. The transformed qi of dampness is Yin within Yang, misty, turbid, and greasy, resulting in the most numerous accompanying syndromes, the most illusory changes, and the slowest recovery. Manifestations include a turbid complexion resembling oil, foul and greasy breath with loss of taste, or sweet saliva in the mouth. The tongue coating is white and greasy; if the pathogen in the Membrane Source is heavy, the coating covers the entire tongue, thick like accumulated powder, tightly adhered and loose. The pulse is vague and unclear, or deep and fine resembling hidden, intermittent and uneven. (The pulse appears similar to deficiency-cold due to pathogen suppression; misdiagnosis causes grave harm.) Spirit is often lethargic and sleepy. At this stage, with the pathogen in the Qi level, one must distinguish whether dampness or heat predominates. In cases of predominant dampness, there are no signs of vexation, thirst, or heat. Heavenly Qi is obstructed by dampness and cannot reach the exterior or descend, leading to distinct aversion to cold, even cold feet, distending and painful heaviness in the head and eyes as if wrapped or covered, body pain preventing flexion and extension, body heaviness preventing turning over, painful and vexing limb joints and muscles, and painful and sore legs and feet. Chest stuffiness indicates dampness blocking the pathway of clear Yang. Afternoon chills and fever resembling Yin deficiency occur because during the Shen, You, and Xu hours, Metal Qi governs, and dampness naturally thrives in the Yin aspect. Short, scanty, yellow, and hot urination occurs because the Lung fails to regulate water passages and transport them down to the Bladder; heavenly Qi pathology causes earthly Qi dysfunction. Loose, unsatisfactory stools or watery diarrhea occur because the Lung and Large Intestine are exterior-interior pairs, and the Heart and Small Intestine are exterior-interior pairs; heavenly Qi pathology causes earthly Qi disharmony.

The general treatment method focuses on lightly opening Lung Qi. The Lung governs the Qi of the whole body; when Qi transforms, dampness transforms itself. Even with concurrent pathogens, they transform together. Dampness is pervasive and originally formless; thus, drugs that are light in texture and pungent-bland in flavor should be used. Pungent herbs include Apricot Seed (Xing Ren), Cardamom Seed (Kou Ren), Pinellia Tuber (Ban Xia), Magnolia Bark (Hou Po), and Agastache Stem (Huo Geng). Bland herbs include Coix Seed (Yi Yi Ren), Tongcao, Poria (Fu Ling), Polyporus (Zhu Ling), and Alisma Rhizome (Ze Xie). Open the upper sluice, branch out rivers, guide dampness downward as an exit route. When dampness leaves and Qi flows, fluids are distributed outward, resolving naturally via sweat. The Classics state: "Obstruction of Water is treated by restraining it." This means water surging upward is restrained and directed downward. Jia Zhen Sun said: "Treating dampness without promoting urination is not correct treatment." For concurrent wind: sweating, aversion to wind. For concurrent cold: aversion to cold, no sweating. Add Perilla Stem (Su Geng), Platycodon Root (Jie Geng), Fermented Soybean (Dou Chi), Scallion White (Cong Bai), and Ginger (Sheng Jiang) to the previous method. For pathogen in meridians causing whole-body pulling pain, add Cinnamon Twig (Gui Zhi), Stephania Root (Fang Ji) stir-fried with water, and Gentian Root (Qin Jiao) to open the congestion of hair follicles and meridians. For concurrent summerheat: red face, thirst, mental restlessness. Remove Cardamom Seed from the previous method; add Dolichos Flower (Bian Dou Hua) and Fresh Lotus Leaf (Xian He Ye) for fragrance and dispelling foulness; Forsythia Fruit (Lian Qiao), Gardenia Fruit (Shan Zhi), and Talcum (Hua Shi) for light, clear, slightly bitter, and bland leaching to resolve summerheat-damp-heat knots. For predominant heat, or damp-heat combining to cause warm disease, where all previous Qi, complexion, coating, and pulse signs are present, plus mental restlessness and thirst, use the previous pungent-bland method. Add Reede Rhizome (Lu Gen), Bamboo Leaf (Dan Zhu Ye), and Talcum (Hua Shi) for light, bland, pungent-cooling effects to clear Metal and drain heat. Once the Lung gains the power of clearing and descending, it naturally transforms damp-heat in the realm of nothingness. The Lung is the heavenly Qi of the human body; as heavenly Qi descends, how can turbid pathogen not descend? It may resolve via sweat or urine. When damp-heat is internally depressed, urine is red and clear; when damp-heat pours downward, urine is red and turbid. Treating damp-heat via the Lung is a timeless principle. Yu Chunshan said: When Yang is depressed by dampness and cannot reach the exterior or descend, aversion to cold and cold feet are often seen. If one rigidly adheres to the concept of aversion to cold in cold damage and uses warming-dispersing drugs, the cold worsens. Instead, use Reede Rhizome (Lu Gen) and Juncus Effusus (Deng Cao) for sweet-bland effects to unblock Yang and open orifices. Boil vigorously and take hot; upon swallowing, heat is felt reaching the exterior, followed by profuse sweating and resolution. This has been verified repeatedly. For initial mental restlessness and confusion, this is extreme damp-heat stagnation internally confusing the clear orifices. Remove Cardamom Seed and Magnolia Bark from the previous pungent-cool-bland method; add Asarum (Xi Xin) 2-3 fen and White Mustard Seed (Bai Jie Zi) 1 qian. Use pungent-moist properties to move water and open blockage, combined with Reede Rhizome and Talcum for light, clear, sweet-bland heat-draining and damp-guiding effects, opening the confusion. This is also verified. If initially confused spirit and inability to speak occur with white-greasy tongue coating and no heat signs, this is cold-dry qi constraining water-dampness, internally confusing the clear orifices. Urgently use pungent-opening and bland-leaching methods, such as Apricot Seed (Xing Ren), Bullace Seed (Niu Bang), Platycodon Root (Jie Geng), Mustard Seed (Jie Zi), Asarum (Xi Xin), Tongcao, Poria (Fu Ling), and Alisma Rhizome (Ze Xie). Do not touch pungent-aromatic, pungent-dry, or ascending-dispersing herbs. Even Ginger (Sheng Jiang), though pungent-moist and not dry, is forbidden due to its ascending nature. Brown sugar is sweet-slow and fills the middle; thick porridge is greasy and cloying; both are prohibited. Avoidance is necessary for one or two days after recovery. This disease shares treatment methods and prohibitions with sand-rash and cholera. For constipation, use Trichosanthes Peel (Lou Pi) and Allium Macrostem (Xie Bai) for pungent-slippery Qi-moving effects. Once Qi moves, stool resolves spontaneously, and sweat may also appear; these can be added according to syndrome. If one does not know that dampness patients prohibit sweating and ascending, sweating leads to Yang collapse, and ascending leads to upper obstruction; closed syndromes prohibit drying and ascending, as drying causes closure and knotting, and ascending increases confusion. Mistaking head/body pain, aversion to cold, no sweat, and hidden rash for indications to use ascending-dispersing herbs like Mint (Bo He), Perilla Leaf (Su Ye), Schizonepeta (Jing Jie), Saposhnikovia Root (Fang Feng), Notopterygium Root (Qiang Huo), and Cyathula Root (Du Huo); or mistaking damp-confused clear orifices and closed syndromes of sand-rash/cholera for indications to use Patchouli Leaf (Huo Xiang Ye) and Mosla Herb (Xiang Ru)... [Text cuts off]