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Tongxing of Dryness and Dampness refers to the phenomenon where extreme dryness resembles dampness, and extreme dampness resembles dryness. The *Huangdi Neijing* (Yellow Emperor's Inner Canon) attributes Wei syndrome (Wasting-Thirst Syndrome / Flaccidity Syndrome) to Lung Heat causing the lung leaves to wither, and states that various Jing diseases (Spasm diseases) and rigidity belong to Dampness; the profound meaning here is worth deep contemplation. Therefore, treatment methods include those that induce sweating and promote urination to unblock Jin-Ye (Body Fluids), as well as those that nourish Yin and moisten Water to dispel Phlegm-Saliva. Zhang Shiwang stated: There is often a type of Dryness syndrome that falsely resembles Bi syndrome (Painful Obstruction Syndrome) caused by Dampness, presenting with whole-body pain and vexation, flaccid weakness and powerlessness in the limbs, and a fine, choppy, and faint pulse. (Upon heavy pressure, the pulse feels Kou [hollow], indicating Yin deficiency.) This occurs because Yin-Blood is damaged by Fire-Heat, failing to nourish the hundred bones. One must not mistakenly diagnose it as Damp-Bi and use Wind-dispelling herbs, for this would intensify the Fire and exacerbate the Dryness-Heat. It is appropriate to use sweet-cold moistening agents to tonify and nourish Yin-Blood, combined with Huanglian (Coptis Rhizome) and Huangbai (Phellodendron Bark) to firm the Yin. He further stated: Whenever the pulse is soft and large upon light palpation but slippery upon heavy pressure, it indicates Dampness combined with Phlegm in the Stomach; if it is choppy upon heavy pressure, it indicates Dampness damaging the Blood of the Ying (Nutritive) channels. The *Neijing* says: Dampness flows into the joints. It also says: The dampness of the earth, when invading, harms the skin, flesh, sinews, and vessels. In such cases, Blood cannot circulate freely, leading to the appearance of Dryness-accumulation syndromes. Thus, Dampness syndromes may present with tendon cramping (*Neijing*: "Due to Dampness, the large sinews become soft and short"), thirst (some desire water, others do not), constipation (turbid Qi in the Lung fails to descend), and dark, scanty, or painful urination (Stagnation of Qi in the Taiyang Channel and its associated Fu organ). Conversely, Dryness syndromes may present with limb flaccidity, chest fullness, and loose stools (slightly loose with little diarrhea), hard Phlegm nodules (adhering in the chest, difficult to expectorate even with force), and cough (Damp-cough worsens at night and when lying down; Dry-cough worsens during the day and with exertion). Furthermore, a Wet disease presenting with a Choppy pulse indicates Qi stagnation, and the pulse must be accompanied by Wiry and Tight qualities; a Dry disease presenting with a Slippery pulse indicates Yin deficiency, and the pulse must be accompanied by Kou and Weak qualities, disappearing upon heavy pressure. These are all cases where the manifestations are similar but the underlying realities differ; one must seek the root cause and treat with nuanced care.

Note: The six pathogenic factors—Wind, Cold, Summer-Heat, Dampness, Dryness, and Fire—when extremely excessive, all transform into Fire characteristics; when extremely stagnant, they all transform into Dampness characteristics; and when stagnation reaches its peak, Dampness transforms into Dryness characteristics. Why? When excessive, turbid Qi invades the clear pathways, rising without descending, thus manifesting as Fire transformation; when stagnant, Jin-Ye cannot circulate freely and accumulates, manifesting as Dampness; when accumulated over time and unable to generate new substances, Dryness transformation appears. Hence, I often say that among the Six Qi, each has its normal transformation, but Dryness arises solely from transformation. Predecessors claimed that Dryness does not cause disease; this is not to say Dryness diseases do not exist, but rather that there are no diseases caused by direct contraction of Dryness pathogens. Conditions such as muscle twitching/cramps, Ding sores (carbuncles), Yin abscesses, and severe colic in the heart and abdomen are all extremes of Dryness transformation, originating from transformations of Dampness, Cold, Wind, and Heat.

Tongbing of Dryness and Dampness refers to Dryness containing Dampness, and Dampness containing Dryness, where both Qi act as Excess syndromes simultaneously, unlike Tongxing which presents with mutual signs of Deficiency. Zhang Shiwang said: There are often individuals with Spleen Dampness and Lung Dryness, where the Fire within Yin easily ascends. Upon ascending, it causes sore throat and dry cough. One must use the moistening property of Beimu (Fritillaria Bulb) to replace the drying nature of Banxia (Pinellia Tuber), the softening property of Wei Jiang (Roasted Ginger) to replace the rigid nature of Ganjiang (Dried Ginger), and add Jiangzhi (Ginger Juice) and Zhuli (Bamboo Sap) to move stagnation. There are also those constitutionally predisposed to Damp-Heat who concurrently suffer from Yin deficiency. This is common among young, robust individuals from affluent backgrounds, appearing more severely than in middle-aged patients, and differs significantly from standard Damp-Heat treatments. One should refer to the examples of Lei Zhongfeng (Stroke-like Syndromes) treated by Li Dongyuan and Liu Hejian. The original text states: Individuals with constitutional Damp-Heat and concurrent Yin deficiency, due to being pampered and unused to physical exertion, may trigger this condition with slight worry or labor, indulgence in alcohol and sex, or the intersection of Summer-Heat and Dampness. This causes deficient Fire to carry Phlegm-Fluids upward, resulting in mild cases of chest/hypochondriac stuffiness and limb fatigue, and severe cases of whole-body pain, phlegmy cough, and wheezing/counterflow qi. Some may experience hematemesis, constipation, facial redness, and cold feet, progressing to flaccidity, syncope, paralysis, and inability to rise. Generally, obese individuals with abundant Phlegm have exterior excess and interior emptiness; combined with Yin deficiency, this leads to upper excess and lower deficiency, making young adults most susceptible. If Wind-dispelling herbs are used to overcome Dampness, deficient Fire easily rebels upward; if diuretic/drainage herbs are used, Yin-Jin (Fluids) easily perish; if strictly using drying-dampness methods, True Yin will be exhausted; if purely using yin-nourishing methods, Phlegm-Dampness will be aided to obstruct upwards. It is essential to balance moistening and drying appropriately, coordinating rigid and soft properties, to achieve success. Formulas such as Qingzao Tang (Clear Dryness Decoction) and Huqian Wan (Tiger-Knee Pill) are suitable compound formulas. For cases of dual Yin-Yang deficiency with declining True Yuan and flourishing Damp-Heat above, if pathogens invade internally, frequent wheezing, chest fullness, and dizziness occur; if overflowing externally, limb pain, heaviness, numbness, and confusion arise. Upon seeing these, one must treat according to the pattern of True Cold below and False Heat above; otherwise, one must guard against stroke-like events. Even in cases of Phlegm-Syncope with collapse, stiff tongue, slurred speech, drooling, facial deviation, or hemiplegia, are these not disasters of internal Heat attracting Wind? Reviewing past treatments, only Zhu Danxi's Dihuang Yinzi (Rehmannia Drink), augmented with Zhuli and Jiangzhi, administered with Heixi Dan (Black Tin Pill), is barely adequate for the syndrome. After half a day, once breathing stabilizes, urgently administer a large dose of Renshen (Ginseng Root) mixed with Zhuli, Jiangzhi, and Tongbian (Child Urine), taken in three divided sips. For wheezing, fullness, and profuse sweating, use Maishan San (Pulse-Recovering Powder) to consolidate and secure. If this window is missed, medicinal efficacy will fail, Fire will rise again, and Qi-tonifying drugs will struggle to penetrate the siege. Once Yuan-Qi is slightly replenished and breathing stabilizes, one may use Jisheng Shenqi Wan (Kidney-Qi Enhancing Pill) mixed with a small portion of Heixi Dan to slowly achieve recovery. As for cases belonging solely to Yang deficiency without Yin depletion, such a scenario is theoretically impossible. Even if invaded by pathogenic Dampness, it will transform with Cold and cannot become Heat. Even if additional external pathogens are contracted, one can deduce treatment from Zhang Zhongjing’s methods for Wind-Damp and Cold-Damp, which do not lead to the same despair as Yin-deficient Damp-Heat. Note: This discussion is profound in principle and precise in treatment, truly worthy of repeated reading.

Based on the above discussion, this concerns Spleen Damp-Heat and Kidney Dryness. Examining the *Jinkui Yaolue* (Essential Prescriptions of the Golden Cabinet), Hei Dan (Black Jaundice) is also caused by Spleen-Stomach Damp-Heat accumulating in the Kidney. *Zegong Manlu* states: When Spleen-Stomach Damp-Heat is excessive, it damages Kidney Water. The *Neijing* says: The Kidney is the gate of the Stomach. Water entering the stomach, its essence is distributed to the Zang-Fu organs and channels to become Jin-Ye, while its dregs exit via the Bladder to become urine; all rely on the True Yang of the Kidney for transformation. If Kidney Yang is insufficient, clear and turbid waters are not distinguished, accumulating as Yin (Fluid retention) and flooding as edema; this is a Spleen-Kidney Cold-Damp syndrome. However, if Spleen-Stomach Damp-Heat exists alongside Kidney Yin deficiency, Damp-Heat sinks into the Kidney, forming Hei Dan. Why? The Kidney dislikes Dryness. When the Kidney is Dry and meets excess Spleen Dampness, it involuntarily attracts it, and unknowingly absorbs its Heat as well. Damp-Heat becomes firmly bound, stagnating turbid Qi, preventing discharge, steaming and soaking, and lingering in the Lower Jiao. Consequently, Blood long fails to receive Clear Qi, becoming turbid and dark, hence termed Hei Dan. If treated correctly early, restoring Kidney Yin allows Yang to assist, providing sufficient strength to transform turbidity without outward manifestation. If initially, Kidney Yin was not depleted, there would be no need to borrow Spleen Dampness, avoiding absorption of its toxicity; thus, the origin of Hei Dan lies in Kidney Dryness. Therefore, treatment methods often combine Yin-nourishing and Diuretic approaches, which is what this refers to. (Note: Shenqi Wan is a formula for nourishing Yin and promoting urination. Ze Xie, Fu Ling, and Gui Zhi therein follow the method of Wuling San; Di Huang, Shu Yu, and Shan Zhu Yu are Yin-nourishing herbs; Mu Dan Pi and Fu Zi are used to move meridians and unblock collaterals.)