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Zhang Zigang stated: The Lung is a delicate organ, fearing cold and detesting heat; therefore, pathogenic factors easily injure it and are difficult to treat, because decoctions and powders pass through quickly, and acupuncture cannot directly reach it. Wang Shengzhi also said: It is easy for the Lung to be diseased, but difficult for medicine to enter the Lung. The words of these two scholars are indeed credible. Generally speaking, coughing is not a major disease, yet ancient physicians discussed it with particular earnestness, precisely for this reason. Thus, the compilation in this section does not disdain being exhaustive.

Regarding Nomenclature: In ancient texts, "ke" (cough) referred to sound without phlegm, while "sou" referred to phlegm without obvious sound; later generations used them together. Essentially, both originate from the Lung. When the sound is loud and arises independently of phlegm, it is called "ke," indicating that the sound is audible to others. When phlegm moves up and down and is expelled along with the sound, it is called "sou," likened to water washing away debris, referring to the movement of Qi back and forth. (From *Jifeng*) [Note: *Xu Yijian Fang Mai Lun* states: Cough arises from rebellious Qi, while sou arises from phlegm. *Baoming Ji* states: Ke refers to sound without phlegm, sou refers to phlegm without sound, and coughing refers to both sound and phlegm. Their meanings are similar.]

Sou and Ke are essentially the same syndrome. Later generations sometimes considered sou as Yang and Ke as Yin, but there is no evidence for this. Moreover, the chapter "Ke Lun" in the *Neijing* discusses only sou, yet the character "sou" does not appear within it. From this perspective, Ke is Sou, and Sou is Ke. The *Suwen* uses the term "coughing" (késou) in only four places, while other chapters mention only "ke" and not "sou." This indicates that coughing is a single syndrome. The *Shengqi Tongtian Lun* states: Injury by dampness in autumn leads to rebellious Qi and coughing. This has the same meaning as the *Yingxiang Lun* but lacks the word "sou," confirming clearly that Ke is Sou. (From *Rumen Shiqin*) [Note: Hezi's view here should not be discarded, so it is listed alongside.]

General Discussion on Origins: The river flows mightily, silent day and night; when waves crash against rocks, imbalance causes noise. Similarly, coughing occurs because phlegm obstructs the chest and epigastrium, causing Qi to rebel and fail to descend, striking and disturbing the Lung. But how does this happen? The answer is: contracting wind and cold, harboring heat or dampness, blood stasis, fluid retention, as well as Lung excess or deficiency, can all obstruct phlegm and trigger coughing. The Lung is a delicate organ, governing the skin and hair externally, and serving as the Canopy over the Five Viscera internally. Exposure to cold forms and consumption of cold drinks easily induce cold; stagnation and steaming of dryness easily generate heat. Precisely because it is susceptible to cold and heat, external and internal pathogens invade mutually, and any movement causes pathogenic obstruction. Is this not the manifestation of imbalance? (From *Zhizhi*)

The Lung is the Canopy of the Five Viscera, specifically governing Qi. Once clear and turbid Qi are separated, there is no coughing. If clear Qi fails to separate, turbid Qi rebels upward to attack the Canopy, compounded by retained fluids and drinking water, the Lung loses its clarity, resulting in coughing. (From *Qixiao*)

Xia Bo stated that although the Five Viscera and Six Fu Organs can all cause coughing, his emphasis lies entirely on the Lung and Stomach, particularly on the concept of "external-internal combined pathogens." The human body has external pathogens, internal pathogens, and combined external-internal pathogens. The chronic coughing of the Five Viscera mentioned here refers to transmission to the Six Fu Organs, indicating the eruption of internal pathogens. If external pathogens enter and injure the Lung, combining to cause coughing, there is originally no precedent for mutual transmission between organs. (From *Yitong*)

External and Internal Causes: Regarding the syndrome of coughing, I have observed that various schools' theories are too complex and miss the key points, often leaving later practitioners confused and ineffective. In my view, the essence of coughing lies in just two syndromes: External Contraction and Internal Injury. Coughing due to external contraction must enter via the skin and hair. Since skin and hair are the exterior correspondence of the Lung, any external pathogen attacking will first enter the Lung; if unresolved, it will transmit from the Lung to the Five Viscera. Coughing due to internal injury originates in the Yin aspect. The Lung belongs to Dry Metal and is the mother of Water. If Yin is damaged below, Yang becomes isolated above; water dries up, metal withers, the Lung suffers from dryness, dryness causes itching, and itching leads to incessant coughing. In summary, although coughing syndromes are numerous, they are none other than Lung diseases; and Lung diseases are nothing more than these two categories. However, one must distinguish between Yin and Yang, and Deficiency and Excess within these two. Coughing due to external contraction involves Yang pathogens entering from outside; thus, treatment should use Acrid-Warm methods to disperse the pathogen. Coughing due to internal injury is a Yin disease where Yin Qi is injured internally; thus, treatment should use Sweet-Pneutral methods to nourish Yin, allowing the cough to heal as Yin recovers. However, external pathogens are mostly Excess; if Excess contains Deficiency, tonification should be combined with dispersion. Internal injuries are mostly Deficiency; if Deficiency contains Excess, clearing and moistening should be combined. Broadly speaking, the causes of coughing do not exceed these principles. Seeking the root here ensures effective treatment. Why cling to Chao Yuanfang's ten types of cough or Chen Wuze's Three Causes, which merely confuse practitioners? Those who pay attention should savor this meaning. (From *Jingyue*) [Note: *Bingji Huilun* offers some remarks on this syndrome but lacks precision, so it is not recorded.]

Non-seasonal Wind-Cold Causing Cough (Prone to Developing Lung Abscess): *Gujin Luyan* (Original Scripture Text) states: Non-seasonal wind-cold damages the skin and hair; if it enters the viscera, it causes coughing and rebellious Qi. Sudden exposure to non-seasonal cold injuring the skin and combining with the Lung causes coughing, rebellious Qi, or pain across the chest and hypochondrium, with bloody sputum. This occurs because heat combines with sudden non-seasonal cold, failing to dissipate gradually, leading to deep stagnation and predisposition to Lung Abscess. Taking warm medicines exacerbates the cough, leading to high fever, purulent bloody sputum, sweating, and aversion to cold. If there is non-seasonal cold, urgently consult formulas for the four seasons. (From *Waitai*)

Coughing as Lung萎 (Lung Atrophy): The Lung resides at the highest position among viscera, with fine pores distributed between its lobes, called "spring eyes." The steaming moisture of the Five Viscera is absorbed through the Lung tubes; as Qi exits through the spring eyes, it transforms into fluid. This process is continuous, irrigating the whole body, akin to the Starry Sea of the body. Once affected by fire inflammation, exhalation turns into inhalation, and blood渗es through these eyes, blocking the airways, causing coughing. Coughing leads to bleeding; the more one coughs, the more blood渗es, and the more it渗es, the more one coughs. Over time, the spring eyes close. During inhalation, fire rises vainly; the throat may itch or choke. During exhalation, no fluid emerges, and the six lobes become dry and scorched. This is the origin of Lung Atrophy. (From *Yixiang Xiance*) [Note: *Yuanliu Lun* discusses how hemoptysis does not kill but coughing does, which complements this theory. Refer to the Hemoptysis section.]

Pulse Diagnosis: Diagnose the pulse according to its location corresponding to the Qi Kou. Floating and tight indicates Deficient Cold; Deep and rapid indicates Excess Heat; Wiry and choppy indicates Blood Deficiency; Surging and slippery indicates Phlegm Dampness. Apply this logic universally. (From *Sanyin*)

In coughing, one must examine the Lung pulse for Excess or Deficiency. Excess pulses are Floating, Large, and Forceful; if Deep and Slippery, Phlegm-Qi is abundant. Deficient pulses are Wiry, Large, and Weak; if Deep, Thin, and Rapid, Fire is severely constrained. (From *Rumen*)

For coughing, a Floating pulse indicates external pathogens, suitable for dispersing. An Excess pulse indicates internal heat, suitable for clearing and draining. A Soft and Scattered pulse indicates edema and deficiency, suitable for warming and tonifying. (From *Jijie*)

If chronic coughing presents a Choppy pulse, or even a Surging-Large pulse that feels empty upon pressure, it belongs to Lung Deficiency. Use Schisandra, Farfara Flower, Aster Root, and Adenophora to astringe and tonify. If the duration is long but the pulse is Slippery, Rapid, and Forceful, it may belong to Excess Fire; treat by clearing the Lung, seeking fire, and resolving phlegm. (From *Jinnang*)

Diagnosing Prognosis: Coughing with a Deep-Tight pulse indicates death; Floating-Straight indicates survival; Floating-Soft indicates survival (*Shenghui* reads Large instead of Soft); Small-Deep-Hidden pulse indicates death (*Jicheng* reads Floating-Large is easy to treat, Deep-Micro is difficult). Coughing with emaciation and a Firm-Large pulse indicates death (*Chaoyuan* reads Large collateral vessels indicate death). (*Maijing*) Floating-Short pulse indicates Lung injury, with weak Qi, leading to death within a year, manifesting as coughing. (Ibid.) [Refer to Death Syndromes] Coughing with Rapid pulse and emaciation indicates death. Sudden coughing with a Scattered pulse indicates death. Coughing with a Fat body and extremely Urgent pulse indicates death. Various coughs/wheezing with a Deep pulse appearing Floating indicates death. (*Zhongzangjing*)

Treatment of Various Cough Syndromes: Xu Renze discussed several types of coughing: Heat Cough, Cold Cough, Lung Qi Cough, and Fluid-Qi Cough. Heat Cough occurs in young, strong individuals whose constitution is full; improper diet leads to accumulated heat, causing Heat Cough. Avoiding cold food and using cooling herbs stops it. Cold Cough occurs in the elderly or weak; improper diet leads to cold accumulation, causing Cold Cough. Warming the diet and taking warm herbs restores health. Lung Qi Cough affects all ages; those with upper heat suffer from dietary heat, leading to chronic coughing. Over years, Lung Qi declines, becoming Qi Cough. If untreated, it becomes Lung Atrophy, which is often incurable. Fluid-Qi Cough results from stagnant fluids in the chest rushing upward into the Lung, causing coughing. If prolonged, it becomes Water Qi disease, which is hard to treat. Symptoms of Heat Cough: triggered by heat. Symptoms of Cold Cough: triggered by cold. Lung Qi Cough progressing to Lung Atrophy: symptoms vary regardless of season, constant night coughing, white snow-like thick sticky foam, wheezing, alternating chills/fever, dry lips/throat/tongue, occasional bloody sputum, gradual emaciation, red urine, pale complexion, erect hair, and steaming sensation. Lung Qi Cough progressing to Lung Abscess: similar to Atrophy but expectorates pus. Fluid-Qi Cough progressing to Water Disease: constant day/night coughing, aggravated by triggers, severe cases show bulging eyes, gasping, sweating, urinary/fecal retention, profuse frothy sputum, shoulder breathing, morning eye swelling, inability to lie flat. (From *Waitai*)

*Jiyao Fang* states: There are several types: Cold-Heat Cough, Lung Atrophy Cough, Lung Abscess Cough, and Water Qi Cough. If the constitution is not hot but coughing is triggered by cold, relieved by heat, it is Cold Cough. If the constitution is not cold but coughing is triggered by heat, relieved by cold, it is Heat Cough. If the constitution is hot, coughing is chronic, worsened by heat, unresponsive to cold, with little pus but thick white small bubbles, it is Lung Atrophy Cough. If neither cold nor heat remedies work, and sputum is thick like abscess pus, it is Lung Abscess Cough. If neither cold nor heat applies, chronic coughing with rebellious Qi, wheezing, abdominal distension, head/face Qi sensation, or generalized edema, it is Water Qi Cough. (From *Yixin*)

Coughing with natural saliva and a slippery tongue coating indicates Floating Cold, not Lung Atrophy. (*Maijing*)

Retained Fluid Cough: The patient cannot lie down due to coughing, neck pain radiates, and coughing resembles infant convulsions. (*Qianjin*)

Causes include Cold, Wind, and Heat. Wind-Cold comes from outside; Heat arises from inside. Wind-Cold affects the meridians directly; Heat affects organs via steaming. Treat Wind by dispersing, Cold by warming, Heat by regulating. Wind-induced cough worsens in wind; Cold-induced cough worsens with cold; Heat-induced cough flares with heat. (From *Jifeng*)

Coughing has two types: Heat and Cold. Heat Cough has thick sputum and a fishy smell; use cooling herbs. Cold Cough has thin sputum; use warming herbs. Drinking cold water temporarily stopping cough indicates Heat Cough; drinking hot water temporarily stopping cough indicates Cold Cough. This method is effective. Xiao Chai Hu Tang treats Heat Cough; Lizhong Tang plus Schisandra treats Cold Cough. Verified. (From *Yishuo* citing *Yiyu*)

Generally, coughing originates from the Lung. Medication strategies fall into three categories: Cold, Wind, Heat. Wind-Cold comes from outside; Heat arises from inside. Wind-Cold affects meridians; Heat affects organs. Disperse Wind, Warm Cold, Regulate Heat. Purging targets the Lung Meridian, not the Fu Organs; use Thladiantha Fruit and Mulberry Bark. Wind-induced cough worsens in wind; Cold-induced cough worsens with cold; Heat-induced cough flares with heat. A reliable test: ask about night drinking. Cough worsening after alcohol indicates Heat; cough improving after alcohol indicates Cold. Blue-white saliva indicates Cold; thick yellow saliva indicates Heat. Prescribe based on syndrome. (From *Heji Zhinan*)

Wind-contracted: nasal congestion, heavy voice. Cold-injured: shivering, aversion to cold. Heat-clasped: irritability. Dampness-contracted: stagnation. Blood stasis: chest stuffiness. Fluid retention: palpitations. Whether Excess or Deficiency, yellow/white phlegm and thin/thick sputum reveal the nature. (From *Zhizhi*)

Summer cough with fever is Heat-Phlegm Cough: Xiao Chai Hu Tang 4 liang, add Gypsum 1 liang, Anemarrhena 0.5 liang. Winter cough with chills/fever is Cold Cough: Xiao Qing Long Tang plus Apricot Kernel. These are general rules; adjust seasonally. (From *Baoming Ji*)

Cough syndromes generally involve Wind, Cold, Heat, Damage, and Labor. Wind: external wind-cold enters Lung Meridian; symptoms include aversion to cold/heat, headache, sudden phlegm obstruction, incessant cough, Floating pulse. Use San Ao Tang or Jin Fei Cao San. If no improvement, use Taiyang dispersants. Cold-injured cough: no chills/fever, caused by Stomach/Spleen cold transmitting to Lung, causing Cold Cough with white foam/vomiting. Use warming herbs for Spleen/Stomach: Zhizhong Tang, Pepper Lizhong Tang, Clove Pinellia Pill, or Lizhong Tang plus Schisandra. Latent Heat Cough: wind-heat in chest/diaphragm causes chest fullness, dry throat, yellow turbid sputum, or hemoptysis. Use Xixin San or Jin Fei Cao Tang plus Scutellaria. Damage Cough: men injured by trauma/heavy lifting, women by labor, damaging Lung Meridian. Triggered by wind/cold/heat; regulate accordingly. Severe cases with purple-black blood: remove heart/liver blood stasis with Sappan Wood, Rehmannia, Red Peony, Angelica; moxa Feishu (BL13). (From *Zhibing Huofa Mifang*) [Labor cough seen later; Damage cough refer to Blood Stasis Cough.] Cough includes Wind-Cold, Phlegm-Fluid, Fire Constraint, Labor Cough, Lung Distension. Dry cough is hard to treat, belonging to Fire Constraint with Phlegm trapping Fire. (From *Danxi*) [Note: Original distinguishes by time of day; omitted here.]

Dai Yun stated: Wind-Cold: nasal congestion, heavy voice, aversion to cold. Fire: sound with little red sputum. Labor: night sweats, alternating chills/fever with phlegm. Lung Distension: wheezing/fullness on movement, urgent breathing. Phlegm: rattling sound on coughing, stops when phlegm is expelled. These are the five main types. (From *Gouxuan*)

Coughing expelling phlegm immediately indicates Spleen Dampness with slippery phlegm. Coughing repeatedly without expelling phlegm indicates Lung Dryness with sticky phlegm. For slippery phlegm, use Aconite, Pinellia, Gleditsia Ash to dry Spleen; avoid Qi-moving agents. For sticky phlegm, use Aurantium, Perilla, Apricot Kernel to benefit Lung; avoid drying agents. (From *Gangmu* citing Dan)

Coughing with red face, hot chest/abdomen/flanks, cool feet, and Surging pulse indicates Heat-Phlegm in chest/diaphragm. Use Xiaoxianxiong Tang or Mengshi Wan to clear diaphragm and descend phlegm. Severe cases require vomiting/purging. Pale face, sneezing, flank pain, Deep-Wiry-Thin-Slow pulse indicates Cold-Fluid in chest/abdomen. Use Acrid-Warm herbs to dispel. (Ibid.)

Cold-contracted cough: aversion to cold, no sweat, fever, or runny nose. Use Xingzi Tang. Heat Cough unresponsive to other drugs: Zhuye Shigao Tang minus Zhuye, add Coix Seed, slight Anemarrhena, increased Schisandra and Apricot Kernel. Only use if latent heat is in Upper Jiao Heart/Lung. (From *Yaojue*)

Winter wheezing/coughing caused by external cold holding internal constrained fire rising: treat by releasing exterior cold and promoting Qi to relieve internal constraint. (From *Yuanli*)

Fire-Heat Cough with hoarse voice, thick sputum, or constipation: Liangge San plus Platycodon. (From *Yitong*)

New vs. Old, Excess vs. Deficiency: Lung governs Qi and skin/hair. Physical exertion leaks Qi, opening pores; wind-cooling suddenly injures Lung, causing acute Qi Cough with severe coughing and little phlegm. Chronic coughing indicates extreme Lung Deficiency; Qi rebels against the deficient Lung, causing persistent coughing. Prolonged rebellious Qi causes facial/body edema due to deficiency moving internally/externally. (From *Bingyuan Lun*)

Chronic coughing unresponsive to medicine, unlike Labor Cough: use San Ao Tang assisted by Qingjin Dan. Acute coughing unresponsive to medicine may be cured by Shengliao Lurong Wan or Datusizi Wan, caused by Kidney Deficiency. Do not hesitate to tonify despite acute presentation. Early detection aids recovery. (From *Yaojue*)

New cough with phlegm is external contraction; resolve promptly. New cough without phlegm is Fire-Heat; clear it. Chronic cough with phlegm: dry Spleen, transform phlegm. Chronic cough without phlegm: clear Metal, descend Fire. Long-standing external contraction leads to constrained heat; long-standing internal injury leads to flaming fire; both require resolving constraint and moistening dryness. For emotional Qi rebellion, use Aurantium and Cyperus to smooth Qi. For retained fluid/food, use Pinellia and Areca Nut to guide out. For Qi/Blood deficiency, tonify and astringe. Blindly using Adenophora or Poppy Shell astringents without treating the root prolongs illness. Lung is delicate, sensitive to cold/heat. Ginseng is mild, best for Qi Deficiency. For Lung Heat/Fire or early Wind Pathogens, use Glehnia or Scrophularia instead. Thus, cough is not limited to Cold. (From *Rumen*)

Coughing varies by new/old, excess/deficiency. New coughing involves Lung Excess: disperse Wind, release Cold, clear Heat, purge Fire, remove Dampness,