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Phlegm should be cleared. If a patient with a chronic illness suddenly coughs, although the disease has been long-standing, the sudden onset of coughing is considered a new cough, which must be caused by a recent wind-cold attack or food stagnation. Wind-cold should be dispersed, and food stagnation should be resolved; thus, recovery will occur. Chronic cough generally belongs to deficiency or constraint patterns. Some are caused by Qi deficiency, some by Blood deficiency, some by Blood deficiency with hyperactive fire leading to panting, coughing, and hoarseness, some by dual deficiency of Qi and Blood, some by consumptive diseases accompanied by cough, phlegm, fever, thirst, and sweating, and some by consumptive diseases with hemoptysis, phlegm, and panting. Some consumptive cases involve only one or two coughs without phlegm, night fever followed by chills, and excessive dreaming. Some have fire constrained in the Lung, causing coughing with sound but no phlegm. Some have damp-phlegm internally constrained, where coughing subsides slightly after expectoration but returns shortly after. There are also cases where chronic cough damages the Spleen, causing sores all over the face. There are cases of chronic cough with loss of voice, loss of Qi, facial and ocular edema, and progression to consumptive disease. There are cases of chronic cough lasting years with no effect from various medicines, lacking other symptoms, distinct from consumptive cough. There are cases of dry cough caused by phlegm and fire constraints in the middle Jiao; this condition is extremely difficult to treat. Initially use opening formulas (preferably Xiaoyao San with heavy doses of Jiegeng), followed by Yin-nourishing agents. (*Zunsheng Shu*)

New coughs are easy to cure, while chronic coughs are difficult. The reason for the difficulty lies in the transmission and deepening of the pathogenic factors. (*Cangsheng Siming*)

Treatment of Exogenous and Endogenous Coughs (Non-internal/External Causes): Exogenous conditions can cause cough, and endogenous conditions can also cause cough; these represent excess and deficiency respectively, requiring differentiation in treatment. Generally, exogenous cough arises from accidental exposure to wind-cold, manifesting as alternating chills and fever, dyspnea, nasal congestion with heavy voice, headache, and expectoration. With mild pathogens, the pulse is harmonious and moderate; with severe pathogens, the pulse may be wiry, surging, or slightly rapid. If there are no prior signs of chronic exhaustion or deficiency, and the cough appears abruptly, it is an exogenous pattern. Conversely, endogenous cough develops gradually, often due to sexual excess or overwork, starting with mild cough that worsens daily. Symptoms include night tidal fever, emaciation, persistent malar flush, shortness of breath, and dry throat. The pulse is slightly rapid on light palpation and fine, rapid, wiry, or tight on heavy pressure. Exogenous cough comes abruptly and is caused by cold pathogens, treatable with warming or dispersing methods, making it easier to cure. Endogenous cough comes slowly and is caused by Yin deficiency, requiring tonification and harmonization, making it harder to cure. This is the fundamental distinction. However, some patients with weak pulses and signs may suddenly contract exogenous diseases; others with strong constitutions may develop endogenous diseases due to illness. In such ambiguous cases, careful examination of etiology, pulse, and complexion provides verification. Misdiagnosis and incorrect treatment carry significant risks, demanding utmost caution. (*Jingyue Quanshu*)

Differentiation between exogenous cough and Yin-deficiency cough is particularly crucial. Exogenous cough features loud and turbid voice, starting slow then becoming urgent, continuous day and night, with thick sticky phlegm and urgent panting. Consumptive cough due to Yin deficiency features a timid and dry voice, starting urgent then becoming slow, worsening in the morning or evening, with thin phlegm, shortness of breath, and fatigue. (*Yitong*)

Exogenous cough is considered mild because although Lung Qi is constrained, it remains patent. Thus, clear nasal discharge, nasal itching with sneezing, and throat itching with coughing occur. If constraint is severe and heat obstructs, preventing upward flow, the nose becomes dry and blocked, without sneezing or coughing. Mild constraint seeks external dispersion and upward unblocking; severe constraint turns inward and downward. Endogenous cough is considered severe. For instance, Liver and Kidney fire initially affects the Lower Jiao without immediately harassing the upper regions. Over time, as fire intensifies, it rebels against the Lung, making the condition severe. (Lung fire originating from within is not discussed here.) (*Yi Que*)

Note: Although cough is a Lung disease, all Zang-Fu organs can cause it. Analyzing details reveals omissions in classical texts; summarizing principles, it boils down to endogenous and exogenous causes. External pathogens (wind, cold, summerheat, dampness) first affect the skin and hair, which correspond to the Lung. If Lung pathogens remain unresolved, other meridians become involved, transmitting from the Lung to other organs. Internal injuries (fatigue, desire, emotions) damage Zang Qi, starting from the Yin aspect and affecting the Upper Jiao, transmitting from other organs to the Lung. Diseases entering from the exterior affect Yang; treat with acrid-warm herbs to disperse pathogens, clearing the Lung and stopping cough. Diseases arising from within affect Yin; treat with sweet herbs to nourish Water and moistening herbs to nourish Metal, calming the Lung and stopping cough. Generally, treating exterior patterns requires herbs that do not remain static; static herbs allow pathogens to linger and transform into other diseases, hence avoiding cold, bitter, and astringent herbs, as stated in *Wuzang Shengcheng Pian*: "The Lung desires acridity." Treating interior patterns requires herbs that do not overly disperse; dispersing herbs agitate deficient fire and worsen dryness/itching, hence avoiding acrid-aromatic and drying-hot herbs, as stated in *Xuanming Wuqi Pian*: "Acidity moves Qi; avoid excessive acrid consumption in Qi disorders." (*Bixu*)

If a patient coughs with chills and fever, drawing pain to the lower back, or with panting and fullness, this is due to sexual fatigue damaging the Kidney. If the patient has epigastric fullness, abdominal distension, heart pain, and anorexia, this is due to irregular eating damaging the Spleen. If the patient coughs with left hypochondriac pain radiating to the lower abdomen and knees/ankles, this is due to extreme fatigue damaging the Liver. If the patient coughs, spits white saliva, has dry mouth, and hoarseness, this is due to shouting damaging the Lung. If the patient has panting cough, irritability, fever, spontaneous sweating, dry throat, and hemoptysis, this is due to mental labor damaging the Heart. These all belong to non-internal/external causes. (*Sanyin Fang*)

Cough caused by seven emotions or irregular diet involves injury to the upright Qi of the Zang-Fu, leading to rebellious pathogens forming phlegm and obstructing the Lung pathways. Prioritize regulating Qi using Six Seven Decoction (Siqi Tang) half dose, plus Sangbaipi, Xingren, Wuweizi, Renshen, and Ejiao, each half qian. If coughing expels both phlegm and food, this is likely due to dietary irregularity causing Liver Qi stagnation and invading pathogens in the Lung. Since the Liver governs turbid pathways and the Lung governs clear pathways, their interference requires Erchen Tang plus Muxiang, Xingren, Xixin, and Zhike, each half qian. Drinking cold/hot alcohol or cold water injuring the Lung causes cough,俗称 "Cu Fei" (Gathering in Lung); use Ziwan Yin. (*Yaojue*) (Note: Ziwan Yin is the Ziwan Rong Tang from *Jisheng Fang*.)

For those indulging in sex with weak Yuan Qi and persistent cough, Qiongyu Gao is most effective. For severe Lung deficiency, Ren Shen Gao supplemented with Shengjiang and Juhong is used. Add phlegm-resolving herbs if phlegm is present. (*Yuanli*)

If cough is accompanied by food stagnation, use digestive formulas; avoid sour/astringent herbs like Wumei and Susu Ke. If cold pathogens remain, use dispersing agents; do not use tonics prematurely. (*Yitong*)

Consumptive cough (cough with worms in the Lung): The current concept of consumptive cough is not explicitly found in ancient texts; it is presumed to be the "Evil Cough" described by Hua Tuo or the "Zhù Cough" described by Zhenren. This disease results from sexual/dietary excess and extreme fatigue damaging the Lung and collaterals. Severe cases expectorate pus and blood; mild cases fluctuate. It can also arise from deficiency combined with evil Qi transmission (Zhù). Symptoms include hemoptysis preceding cough, or gradual wasting from cough. This involves not only internal Lung injury but also evil transmitted Qi, making it particularly toxic. Zhenren’s Tongqi Wan for Zhù Cough uses four segments of Wugong. It is also said that dreams of intercourse with ghosts require full doses of Wugong. The *Waitai Mi Yao* formula Siman Wan for five types of coughs also uses Wugong. Recent physicians, understanding the intent, mostly use Gejie, Tianlinggai, Taoliuzhi, Shexiang, Dansha, Xionghuang, and Anxi Xiang—spirit-unblocking herbs—to treat this, surpassing ancient methods. Additionally, worm-like entities in the Lung cause throat itching and cough; decoctions pass through ineffective, and acupuncture cannot reach them. Using lozenges kills the worms, stopping the cough. (*Jifeng Puji Fang*)

Regarding sexual excess, consumptive Blood deficiency, internal depletion of fluids, and self-flaring Heart fire causing dry-heat to harass the Lung, resulting in hemoptysis, upper Qi rebellion, and phlegm tides, the cough is continuous. Because Blood fails to nourish muscles, pathogens in the skin/hair easily enter the Lung, especially via the back. In such cases, Renshen, Xiong, and Gui are indispensable. (Note: *Yitong* suggests Zhi Gancao Tang or Huangqi Jianzhong Tang plus Mudanpi. Mudanpi is acrid-aromatic, harmonizes Ying-Qi, treats bone-steaming fever without sweat, and serves as a guide for releasing the exterior in Yin-deficient patients.)

Transmitted diseases involving evil Qi, overcoming the Five Zang, are deeply toxic. Recent practitioners mostly use Gejie, Tianlinggai, Taoliuzhi, Dansha, Xionghuang, Anxi Xiang, and Suhexiang Wan—spirit-unblocking agents. (*Zhizhi Fang*)

Consumptive cough arises from Lung deficiency, exacerbated by wind/cold/summerheat/dampness, irregular work/rest, emotional depression, worry/thought/anger, or dietary irregularities, leading to Zang-Fu imbalance, accumulating from subtle to manifest, eventually forming Lung萎 (Flaccidity) or Lung Abscess. Cough may produce much phlegm or be dry without phlegm, even progressing to aphonia, expectoration of pus/blood, fever, five-palm heat, night sweats, nocturnal emissions/dreams, diurnal improvement/nocturnal worsening, emaciation, dry skin, and malar flush resembling rouge, with decreasing appetite. Ancients said: "Ulcers unhealed for a month harbor worms; coughs unhealed for a month harbor worms in the Lung." If worms exist in the Lung, drugs struggle to work. Lung worms resemble silkworms, causing chaos, accumulating over months/years to form consumptive worms. (*Zhibing Huofang Mifang*)

Consumptive cough may result from chronic cough developing into consumptive disease, or from consumptive disease causing cough. Symptoms include alternating chills/fever, isolated fever, sore throat, and extreme fatigue. Sputum varies in thickness/color, sometimes bloody, exceptionally foul-smelling, with aphonia. Use Bufei Tang half dose, plus Xingren, Beimu, Kuandonghua, Ejiao, and Baihe, each half qian. Decoct, strain, and mix with Zhongru Fen. For sore throat, add Jiegeng half qian. For high fever, add Qinjiao half qian. For vomiting, remove Dihuang, add Banxia in equal amount. For dyspnea, add Lingsha Dan or Erchao Dan. (*Yaojue*)

If chest pain occurs during hunger, with millet-sized white spots on lips/face, and unbearable cough with throat itching/pain, and pulse is extremely rapid or fluctuating, this indicates Ascaris lumbricoides (Cunbai Chong) in the Lung seeking food during hunger, causing painful cough. Use single-ingredient Baibu steamed paste, slightly adding Binglang and Wumei. (*Yitong*) (Note: Baibu treats chronic cough, cited from *Qianjin Fang*.)

Ha Cough (Gasping Cough): Ha cough is essentially coughing. When there is abundant phlegm-fluid in the chest/diaphragm, coughing moves the phlegm, striking the throat/pharynx. Phlegm and Qi collide, producing gasping sounds synchronized with breathing, called Ha Cough. While similar to general cough, treatment differs by adding phlegm-resolving and fluid-breaking herbs. (*Zhubing Yuanhou Lun*)

Blood Stasis Cough: Lung distension with cough, inability to sleep on either side, is caused by phlegm and blood stasis obstructing Qi. Nourish Blood to move Qi, descend Fire, soothe Liver, and clear Phlegm. Use Siwu Tang plus Tao Ren, Hezi, Qingpi, Zhuli, and Jiangzhi. For blood-stasis-induced cough, peel Tao Ren, stir-fry Dahuang with ginger juice, and make pills. (*Danxi Xinfa*)

Blood stasis cough presents with a fishy/foul odor in the throat. Mild cases use Xiebai San plus Shengdi, Zhizi, Mudanpi, Maidong, and Jiegeng. Severe cases use Tao Ren and Dahuang, made into pills with ginger juice. If cough triggered by trauma/labor injury, worsened by wind/cold, or with purple-black blood, use Siwu Tang minus Xiong, plus Dahuang and Sumu powder, taken with wine. Expel blood stasis from Heart/Lung to stop symptoms, then regulate with Renshen Yangrong Tang. (*Rumen*)

Distension in front/back of chest, fishy odor in throat, and choppy pulse at Qi Kou indicate retained blood in the diaphragm. Test: hiccuping after drinking hot ginger soup indicates blood stasis. Attack with Xijiao Dihuang Tang plus Tongbian, Tao Ren, and Dahuang, or Pingwei San combined with Yueju Wan plus Jiuzhi and Tongbian. For Qi exhaustion and Liver injury with bloody cough, use Si Wu Mei Yi Lu Ru Wan. (*Yitong*)

Epidemic Cough: Epidemic cough presents with fever, chills, headache, nasal congestion, dyspnea, resembling cold/heat injury, with continuous coughing. Patients bedridden initially, improving within 1-2 days. Recalling autumn of Renwu year, this disease swept Mancheng. Later, summer-autumn of Jiawu year, it spread south to north, sparing few, called "Toad Plague." Treat with Shen Su Yin plus Xixin half qian. (*Yaojue*) (Note: Also in Xu Yengdeng's *Yi Bian*, using Baidu San.)

In northern regions during prolonged summer/autumn rains, epidemic cough with headache can be treated with ancient Yiyuan San mixed in ginger/scallion soup, yielding immediate results, expelling dozens of jin of sputum overnight. This is due to Earth transport dampness, phlegm obstructing Lung Qi orifices; draining the Bladder orifice suffices, excluding it from standard cough categories. (*Hanshi Yitong*)

Dun Qiang (Paroxysmal Cough): Colloquially called "Qiang," continuous coughing is Dun Qiang. One breath triggers 20-30 coughs, or at least ten. Head tilts forward, chest curves, limbs may spasm, phlegm exits mouth, tears/nasal discharge follow, sensation extending from chest to lower abdomen. In adults, it resembles asthma; in children, it is epidemic Dun Qiang. Untreated, it resolves in a month. (*Yixue Zhenchuan*) (See Qingliang Fang for formulas.)

Cough with Shortness of Breath: Lung governs Qi and corresponds to skin/hair. Qi deficiency allows mild cold to invade skin/hair, damaging Lung Qi, causing insufficiency and cough. Qi warms and flows smoothly; cold makes it stagnant. Deficiency leads to insufficient Qi forced by cold, gathering in upper Lung, unable to diffuse, causing cough and shortness of breath. (*Zhubing Yuanhou Lun*)

Cough with Rebellious Qi: Cough with rebellious Qi indicates Lung Qi excess. Cold invasion causes mild cough. Lung governs Qi; excess Qi leads to panting, cough, and rebellious Qi. Pathogens contend with Qi, causing obstruction and lack of diffusion, resulting in excess, hence cough and rebellious Qi. (*Zhubing Yuanhou Lun*)

Chronic cough with rebellious Qi indicates extreme Lung Qi deficiency with stagnant wind pathogens. Persisting for months/years without cure, it causes chest/back pain, facial swelling, and expectoration of pus/blood. (Ibid.)

Cough with Pus and Blood: Caused by damage to Lung and Heart. Lung governs Qi, Heart governs Blood. Cold invasion causes mild cough; injury to Yin vessels causes bleeding. Blood and Qi travel together; severe cough injures Blood and agitates Qi, both assaulting the Lung. Lung fluids clash, fermenting into pus, causing cough with pus/blood. (*Zhubing Yuanhou Lun*)

Severe cough injures collaterals, causing blood accumulation and pus/blood. Dual injury to Qi and Blood leads to chronic stagnation, dark瘀 blood mixing with pus. (Ibid.)

Coughing pink-red sputum is called "expectorating white blood," allowing survival for years. Bright red blood, thick like lacquer, is "organ-retaining blood," untreatable. Cough with sputum and chest/breast pain: examine sputum color. Thick/turbid like pus or bloody/foul indicates Lung Abscess; treat accordingly. (*Yitong*)

Hoarse Voice from Cough: Lung corresponds to Metal. "Metal solid does not ring; metal broken does not ring." Solid Metal implies pathogens in Lung (cold or fire). Broken Metal implies true Yin damage (Qi or Essence deficiency). Cold pathogens require acrid/warm; fire pathogens require sweet/clear. Qi deficiency requires Yang tonification; Essence deficiency requires Yin tonification. Generally, excess pathogens come abruptly and are easier to treat; deficiency comes slowly and is harder to treat. (*Jingyue Quanshu*)

Pulse floating or sinking with intact voice is easy to treat. Surging/rapid pulse, emaciation, red face, and Kidney Qi failure failing to ascend to larynx causing hoarseness is difficult to treat. (Based on *Yuanbing Ji*). Lung collateral blockage causing hoarseness is excluded. (*Yitong*)

Death Signs: Cough with emaciation and fever, small/firm/urgent pulse indicates death. Emaciation with persistent fever indicates death. Cough with vomiting, abdominal distension, and diarrhea (or incontinence per *Zhongzang Jing*), with pulse wiry/urgent nearing extinction indicates death. (*Maijing*)

Cough with hematuria, emaciation, and large pulse indicates death. (*Zhubing Yuanhou Lun*)

Consumptive cough with upper cough and lower diarrhea: Stopping cough stops diarrhea but worsens it; stopping diarrhea restarts cough. Lung and Large Intestine are exterior-interior paired; simultaneous Zang-Fu disease untreatable jointly indicates death. (*Cangsheng Siming*)

Yin deficiency with fire agitation causing throat bi and hoarseness is untreatable. Cough with diarrhea is difficult. Cough with persistent fever is difficult. (Ibid.)

Cough with sore throat/hoarseness preventing medication, or prolapsed anus with cough, are incurable. (*Shishan Yi'an*)

Death Signs (Six Types): Edema, emaciation, persistent fever, abdominal distension, vomiting, diarrhea. (* Shibing Jiefang*)

Key Treatment Principles: General method for cough: Floating Lung pulse indicates wind-pathogen; treat with dispersion. Excess Lung pulse indicates Qi stagnation/internal heat; treat with clearing/draining. Soft/scattered pulse indicates Lung deficiency; treat with tonifying/calming Lung. For chronic coughers previously treated with purgatives leading to Lung/Stomach cold and anorexia, use Lizhong to assist Stomach plus mild cough remedies. (Consumptive cough section omitted as seen above). Thus, one can navigate cough treatment here, yet further explanation is needed. Lung exhales Qi; Kidney grasps Qi. Lung is master of Qi; Kidney is storehouse of Qi. If cough is violent, moving the whole body, with Qi rushing up from below navel, this is Kidney deficiency failing to grasp Qi. Treat with Buguzhi Anshen Wan. Do not merely focus on calming Lung (Anshen Wan need not be used; principle preserved). Use Zhike as assistant; it expands middle and moves Qi. Downward movement of Qi and Phlegm resolves other symptoms. (*Zhizhi Fang*)

Generally, prioritize regulating Qi, then resolving phlegm. For cough with retained fluids, use digestion aids. Strictly avoid astringents like Ying Su Ke. If cold pathogens remain, avoid tonics. Most taboo: excessive worry/thought and sexual fatigue, otherwise consuming diseases often result. Be cautious! (*Dacheng*)

Lung governs skin/hair. In health, Ying-Wei circulate, internal Qi reaches exterior via skin/collaterals. If wind/cold binds exterior, internal Qi cannot reach exterior, rising from within, causing Qi ascent and Phlegm elevation, hence cough. Use acrid-warm/cool herbs to disperse wind/cold; pathogens retreat, Zheng recovers, cough stops. Note: Lung is the Canopy. Irregular diet, labor, emotions, rich food/alcohol cause Fire ascent and Phlegm elevation, injuring Lung, causing cough. Use Fire-descending and Phlegm-resolving agents; Fire descends, Phlegm clears, cough stops. Note: Lung governs Qi, circulates Blood throughout body. Lung is Metal; receiving Fire pathogens, Qi transforms with Fire, ascending without descending, causing cough/panting. Untreated long-term, extreme deficiency leads to inability to transform Qi/fluids, causing irritability, palpitations, sticky/foul sputum/pus/blood. Use deficiency-tonifying, dryness-moistening, constraint-opening, and Fire-dispersing agents; Lung regains purity/clarity, cough stops.