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[Classical Discourse]
When Yang Qi is deficient, exterior cold occurs; when Yin fluid is deficient, interior heat arises. ○ When the Liver is deficient, vision becomes blurred and objects cannot be seen, hearing diminishes and sounds cannot be heard, fearfulness prevails, feeling as if being pursued by someone. ○ When the Heart is deficient, the chest and abdomen become distended, and pain draws between the hypochondrium and the lower back. ○ When the Spleen is deficient, abdominal fullness and borborygmus occur, food unrotted diarrhea (Sun Xie) appears, and food fails to digest. ○ When the Lung is deficient, there is shortness of breath and inability to take a deep breath, deafness, and dry throat. ○ When the Kidney is deficient, there is pain in the chest, pain in the large and small abdomen, cold extremities (Qing Jue), and unhappiness of mind. (From *Su Wen*)

The Five Zang organs are responsible for storing Essence (Jing); they must not be injured. If injured, they lose their hold, leading to Yin deficiency. Yin deficiency leads to lack of Qi, and lack of Qi leads to death. ○ When Essence escapes, deafness results; when Qi escapes, vision becomes unclear; when Jin Ye (body fluids) escape, the interstices open and profuse sweating occurs; when Ye (thick fluids) escape, joints become stiff and difficult to flex, complexion becomes sallow, brain marrow diminishes, calves ache, and ears ring frequently; when Blood escapes, the complexion becomes pale and withered without luster. (From *Ling Shu*)

First-degree damage injures skin and hair, causing skin to gather and hair to fall out; second-degree damage injures blood vessels, making them deficient and unable to nourish the Five Zang and Six Fu organs; third-degree damage injures muscles, causing muscle emaciation so that food cannot transform into flesh; fourth-degree damage injures sinews, causing flaccidity and inability to control movement; fifth-degree damage injures bones, causing bone atrophy and inability to rise from bed. ○ For Lung damage, benefit its Qi; for Heart damage, regulate Ying and Wei (Nutritive and Defensive Qi); for Spleen damage, regulate diet and adapt to cold and warmth; for Liver damage, soothe its center; for Kidney damage, replenish its Essence. (From *Nan Jing*)

[Masters' Remarks]
In men, a pale and thin complexion indicates thirst and blood loss. Sudden panting and palpitations with a floating pulse indicate interior deficiency. ○ In men, a pulse that is deficient, deep, and wiry, without chills or fever, accompanied by shortness of breath, interior urgency, dysuria, pale complexion, occasional dimming of vision with epistaxis, and lower abdominal fullness, is caused by consumptive disease (Lao). ○ The pulse in consumptive disease is floating and large, with vexation in the hands and feet, worsening in spring and summer and improving in autumn and winter. Cold in the yin region causes spontaneous emission of essence, and acid soreness prevents walking. ○ A floating, weak, and choppy pulse in men indicates infertility due to clear and cold essence. ○ In people aged fifty or sixty, a large pulse in illness indicates Bi syndrome along the back, borborygmus, or scrofula and goiter (Ma Dao Xia Ying), all resulting from consumption. ○ A deep, small, and slow pulse is called Qi exhaustion. The patient pants heavily upon rapid walking, has cold extremities, abdominal fullness, and severe loose stools with indigestion. (From *Jin Gui Yao Lue*)

Note: "Floating pulse indicates interior deficiency" is likely an interpolation. ○ Note: The character "cold" in "cold in the yin causes spontaneous emission of essence" should be "deficiency," a transcription error. ○ Note: "If borborygmus" does not fit the context and is likely a misplaced bamboo slip; it should be deleted. The character "Ying" in "Xia Ying" should be "Luo" (scrofula). There are cases of Lao followed by Luo, or Luo followed by Lao, but never simultaneous Lao-Ying disease; this should be corrected. (From *Yi Zong Jin Jian*)

Male consumptive disease originates from injury to Essence; female consumptive disease originates from amenorrhea; pediatric consumptive disease originates from the maternal womb. (From *Ming Yi Zhi Zhang*)

When Kidney Qi is deficient, Spleen Qi must be weak; when Spleen Qi is weak, Kidney Qi must be deficient. The Kidney is the ancestral Qi of the pre-heaven, and the Spleen is the generating Qi of the post-heaven; post-heaven Qi relies on ancestral Qi. (From *Feng Shi Jin Nang*)

When Wei Qi is deficient, exterior cold and shivering occur; when Ying Qi is deficient, interior heat and cough arise. Ying deficiency leads to cough damaging the Lung, resulting in bloody sputum; Wei deficiency allows cold to enter the Spleen, resulting in vomiting of saliva. (Cheng Fusheng)

Cold Lao is caused by deficiency of Qi and Blood and cold-deficiency of the Zang-Fu, leading to cold pain below the umbilicus, cold hands and feet, irregular menstruation in women, indigestion, occasional vomiting, alternating chills and fever, joint soreness, emaciated skin, and sallow complexion. ○ Heat Lao is caused by interior heat in the Heart and Lung damaging Qi and Blood, leading to mental restlessness, red cheeks and headache, dry eyes and lips, mouth and tongue ulcers, mental fatigue, intense heat in the four limbs, loss of taste, palpitations, night sweats, limb soreness, or alternating chills and fever. One must examine the cause and tonify Qi and Blood to reduce symptoms. ○ Bone-steaming Lao is named because accumulated heat attaches to the bone marrow, causing emaciation, diarrhea with little food intake, and limb weakness. If it transmits to the Kidney, there is unremitting night sweats, soreness and pain in the waist and knees, and nocturnal emissions with dreams of sexual intercourse; if it transmits to the Heart, there is mental timidity and palpitations, red cheeks, and alternating chills and fever; if it transmits to the Lung, there is chest fullness, shortness of breath, cough with phlegm, and rough, scaly skin; if it transmits to the Liver, there is dim vision, hypochondriac pain, and irritability. Once the Five Zang are diseased, treatment is difficult. Lizhai stated: These conditions often result from menstruation, childbirth, dietary injuries, or emotional injuries damaging the Spleen and Stomach, or improper recovery after illness. (Hu Shenrou)

Bone-steaming Lao is easier to treat if there is profuse sweating, indicating Qi deficiency but Blood not yet exhausted. If there is dry heat without sweating, it is difficult to treat, as Qi and Blood are exhausted internally and cannot circulate externally. (Zhang Luyu)

Question: Why does Yin deficiency cause fever? Answer: During the day, Qi moves in the Yang aspect; at night, Qi moves in the Yin aspect. When Yang enters Yin, sleep occurs, representing Fire returning to Water (Ji Ji hexagram), hence health. If Yin is deficient, Yang enters but lacks Yin to restrain it, causing Yang to float and scatter outward from within, heating the whole body. This heat arises from within. (From *Zheng Zhi Zhun Sheng*)

All causes of deficiency damage stem from alcohol, sexual indulgence, overwork, emotional disturbances, and diet. Some injure Qi first, which then affects Essence; some injure Essence first, which then affects Qi. Essence and Qi in the human body are collectively referred to as the Yin aspect, as Yin is the root of Tian Yi and the ancestor of form. Thus, any damage to form is generally termed Yin deficiency, which is the major category. Specifically, there is Yin-within-Yin deficiency, manifesting as fever, restlessness, red head and face, dry lips and tongue, sore throat, mouth ulcers, hematemesis, epistaxis, hematochezia, hematuria, dry constipation, and painful, difficult urination. There is Yang-within-Yin deficiency, manifesting as aversion to cold, emaciation, shortness of breath, mental fatigue, dizziness, vertigo, nausea, poor appetite, abdominal pain, diarrhea, and incontinence of urine and feces, even progressing to cough with sputum, seminal emission, night sweats, asthma, hoarseness, bone and joint pain, mental confusion, extreme muscle wasting, dreams of sexual intercourse, and amenorrhea in women. Regardless of Yin or Yang, when disease reaches its extreme, it is always due to the collapse of True Yin. True Yin resides primarily in the Kidney, which is the sea of Essence and Blood. Human vital Qi is like the Yang Qi of Heaven and Earth, rising from below; thus, the Kidney is the root of the Five Zang. Therefore, if Kidney Water is deficient, the Liver loses nourishment and Blood becomes dry; if Kidney Water is deficient, water fails to return to its source and Spleen phlegm arises; if Kidney Water is deficient, Heart and Kidney fail to interact and spirit and color deteriorate; if Kidney Water is deficient, it damages Lung Qi causing frequent asthma and cough; if Kidney Water is deficient, solitary Yang has no master and deficiency fire blazes. How can consumptive diseases become so critical unless the root is injured? Thus, severe disease above implies severe depletion below. I say: When deficiency pathogens arrive, harm returns to Yin; when Five Zang are injured, exhaustion reaches the Kidney. At this point, I am powerless. ○ All who damage Yuan Qi suffer from deficiency. Ancients classified Xu Sun (Deficiency Damage) and Lao Zhai (Consumptive Disease) separately; although different, they should be distinguished. Xu Sun may appear in one symptom or cause temporary exhaustion; any injury to Yuan Qi in meridians or Zang-Fu is Xu Sun. Lao Zhai differs: it may involve bone steaming or dry cough, even hematemesis and hemoptysis, with both Ying and Wei failing and daily emaciation, resulting from gradual accumulation and total depletion of root and branch. However, Xu Sun deficiency can be in Yin or Yang aspects; if shallow, warm tonification is suitable. Lao Zhai deficiency is deep in Yin-of-Yin, often unsuitable for warm tonification. Generally, deficiency diseases suitable for warm tonification are easy to treat; those unsuitable are difficult. Although Xu Lao seems different, Lao Zhai damage is simply deeper damage and more severe deficiency. ○ In Xu Sun, red malar flush and red lips indicate Yin deficiency below forcing Yang upward; excessive dry thirst indicates insufficient Kidney Water seeking self-rescue through water intake; hoarseness indicates exhaustion of Kidney Qi, as voice originates in the Kidney; rapid breathing indicates Yin deficiency and Lung desiccation with Qi having no return; dry throat and sore throat indicate deficiency of True Water with floating deficiency fire; insomnia and confusion indicate Blood failing to nourish the Heart and Spirit failing to reside; frequent irritability indicates Yang lacking Yin, softness failing to balance hardness; anger and tendon stiffness/soreness indicate Water deficiency and Wood dryness, with Liver losing support; poor appetite and muscle wasting indicate Spleen Yuan failing and transformation mechanism declining; palpitations indicate Qi failing to condense into Essence; unremitting night sweats indicate Fire preventing Yin from holding or Yang failing to secure without Fire; copious phlegm or clear/white foam indicates Water flooding as Phlegm due to Spleen deficiency failing to control Water; bone pain like breaking indicates Kidney ruling bones and True Yin exhaustion; waist and hypochondriac pain indicate Liver and Kidney deficiency; cold below knees indicates Ming Men decline and Fire failing to return to origin; yellow, astringent, dribbling urine indicates True Yin exhaustion and Qi failing to transform Water; burning soles indicate deficiency fire scorching Yin and Yongquan exhaustion. ○ Lao damage belongs to Yin deficiency, which necessarily means Blood deficiency. Fingernails are the surplus of Blood; thus, during diagnosis, dry yellow nails with a withered appearance reveal the state of hair, skin, and Ying Qi. ○ Conditions resembling damage but not true damage occur only in initial external cold invasion. If external pathogen is not resolved initially and mistaken for internal injury, treated with cooling or purgative herbs, cold pathogen remains latent, causing alternating chills and fever or tidal cough, mimicking Lao. Using damage-treatment methods like Yin-nourishing agents will retain the pathogen, turning non-damage into damage. I have cured several such cases. To distinguish, carefully inspect exterior and interior and determine the cause. Xu Sun has a specific cause, while external pathogens come suddenly. If there are exterior signs, body pain, fever subsiding with slight sweating and returning without sweat, or loud cough, pulse wiry-tight but not rapid or slightly harmonious, even after one or two months with unresolved pathogen and persistent disease, it is not Lao; do not misdiagnose. ○ Once Xu Sun is established, how can it recover without tonification? Some cannot tolerate Ren Shen (Ginseng), Shu Di Huang (Prepared Rehmannia Root), or other tonics, called "deficiency unable to accept tonification." How can life be expected? After Lao causes blood loss, if cough persists and phlegm is profuse, it is due to extreme Spleen and Lung deficiency failing to transform food into Blood, forming phlegm from food. Though not blood, it is related to blood. *Jing* says: Death follows white blood emission. Thus, most profuse and turbid phlegm is untreatable. Left and right are pathways of Yin and Yang. Inability to turn left or right in sleep indicates partial exhaustion of Yin and Yang Qi, mostly untreatable. Xu Sun originally has no external pathogen; thus, despite severe debility, consciousness remains clear. Delirium and incoherence in deficiency indicate Heart failure and departure of Spirit; hoarse cough with inability to speak or rapid breathing indicates Lung failure; extreme muscle wasting in chronic cough indicates Spleen failure; sinews are the root of fatigue; bone/joint pain in deficiency is common, but unbearable pain indicates Blood exhaustion failing to nourish sinews, signifying Liver failure; prolonged Lao with uncontrollable diarrhea indicates Kidney failure. (Zhang Jingyue)

Xu Lao arises from internal injury. Alcohol injures the Lung, causing damp-heat steaming and consuming Lung Yin; sexual excess injures the Kidney, emptying the essence chamber and unrestricting Minister Fire; worry injures the Heart, depleting Blood and allowing Fire to flare upward; overwork injures the Spleen, generating heat and destroying True Yin internally. Anger injures the Liver in two ways: constrained anger causes Liver Fire to blaze internally and scorch Blood; sudden anger causes Liver Fire to rise and induce hematemesis. These five types all consume Essence and Blood. ○ Yin deficiency with interior heat causing Xu Lao is mostly due to alcohol and sex. However, unmarried youths may suffer from congenital insufficiency or inherited maternal Yin deficiency. Nuns, widows, and unmarried women may suffer from Qi and Blood stagnation, causing malaria-like chills and fever, morning coolness and evening heat, anorexia, irregular menstruation, or amenorrhea, mostly due to internal stagnation-fire steaming. ○ Xu Lao symptoms often result from extreme deficiency of True Kidney Water, failing to control Fire, causing Fire to flare upward, leading to red face and lips, nose and mouth bleeding, toothache, and gingival bleeding. Although this resembles Dragon Fire usurping upwards, it differs from floating deficiency Yang. Even with cold lower body and cold feet, it is due to Yin deficiency and rising Fire, not true Yang decline; thus, urine is yellow-red and pulse is rapid. Mistakenly using Gui Zhi Tang (Cinnamon Twig Decoction) and Fu Zi (Aconite Root) to guide Fire back to its origin is like adding firewood to a fire, worsening upper jiao heat, cough, asthma, dryness, thirst, sore throat, and throat rot. ○ Qi deficiency manifests as pale, spiritless complexion, faint speech, weak limbs, and weak pulse; Yang deficiency manifests as cold body, aversion to cold, cold extremities, clear urine, loose stools, and deep-small-slow pulse. Both can be treated with Ren Shen (Ginseng) and Huang Qi (Astragalus Root) via warm tonification. Even in Blood loss, tonifying Qi is applicable, specifically for sudden massive hemorrhage in those not chronically blood-deficient, such as postpartum women. (From *Wu Yi Hui Jiang*)

Modern physicians wrongly consider hematemesis as Xu Lao. Hematemesis has several types: those with cough develop Lao; those without do not. Occasionally, hematemesis is accompanied by cough, but once bleeding stops, the patient recovers fully, not developing Lao. Why? Bleeding cessation restores systemic health, normal diet, and spirit. Even after blood loss, if Yin deficiency with interior heat or bone/joint pain occurs, medication can cure it. If cough persists, disease remains after bleeding stops; day and night coughing with phlegm obstruction and Qi rising leads to death in one to three years. Unremitting cough shakes Yuan Qi in the Kidney; Lung is Mother of Kidney, so Mother's illness affects Son. Lung is the canopy of the Five Zang. *Jing* states: Grain Qi enters the Stomach and transmits to the Lung, nourishing all Zang-Fu. If Lung is diseased, it cannot transmit essence to Zang-Fu; in one year, Zang-Fu wither; in three years, they exhaust. Thus, cough is a truly incurable Lao disease. However, some with cough survive if symptoms ease, diet/lifestyle remain stable, and they practice proper regulation, recovering with rest. This is rare. Others without cough suffer recurrent blood disorders, exhausting Liver and injuring Lung, gradually developing cough and dying from poor regulation. Judging prognosis of blood disorders by this criterion is highly accurate. (Xu Lingtai)

*Nei Jing*'s mention of labor-fatigue requires distinction. Labor can be physical exertion, mental worry, or sexual activity. Although all cause Qi and form decline, the causes differ. Physical labor requires rest, bland diet, and harmonizing Qi and Blood; mental labor requires eliminating thoughts and medicating to nourish the Heart; sexual labor requires abstinence, nourishing Kidney Water, and caring for Spleen Earth. (From *Yi Tang San Ji*)

When Kidney Water is sufficient, Yin Essence ascends to Heart and Lung, ensuring Liver Wood is not excessive and Lung Metal is not deficient. This "Child strengthens Mother" allows Metal to calm Wood. Thus, Water grows daily, Fire declines daily; this ascending Yin Essence promotes longevity. If Kidney Water is deficient, it cannot control Heart Fire in the South, causing Liver Wood to be excessive and Lung Metal deficient. Minister Fire in Ming Men and Pericardium, aided by Heart Fire, insults the unconquerable Water, causing Water to decline and Fire to grow daily. This descending Yang Essence causes premature death. (Yu Tianmin)

In recent times, diseases of Yin deficiency with Fire agitation rarely survive. Why? Initially, diet and routine are normal, with only slight phlegm-cough; patients consider themselves healthy, avoid doctors, and delay treatment. Eventually, they lie bedridden and untreatable. I believe that at the onset, three matters must be attended to: 1. Meet a wise physician; 2. Be willing to take medicine; 3. Observe prohibitions. Missing one makes it untreatable. (From *Yi Jian*)

Prolonged Lao Zhai injures Qi, failing to transport refined essence, causing phlegm and stasis to accumulate and transform into parasites. In the Liver, they are hair-parasites eating sinews; in the Heart, feather-parasites eating blood vessels; in the Spleen, naked-parasites eating muscles; in the Lung, shell-parasites eating skin fat; in the Kidney, scale-parasites eating bone marrow. (From *Yi Xue Zheng Zhuan*)

Among the nine parasites of Chuan Shi, six transmit generations, three do not: Enterobius vermicularis (Nuo), Ascaris lumbricoides (Hui), and Taenia saginata/cysticercus (Cun Bai). The six transmitted parasites arise from Zang toxicity or familial infection. Roughly, within ten days, they traverse four acupoints, cycling every three days to feed and five days to retreat. When active, they feed; when retreating, they sleep in the acupoints for five days, during which symptoms quiet down, allowing medication. Each parasite occupies twelve acupoints; six occupy seventy-two. In a month: first ten days, from Heart to Head (parasite head up); middle ten days, from Heart to Umbilicus (head inward); last ten days, from Umbilicus to Feet (head down). Yang days favor males, Yin days females. Parasites eating organ fat are white. After damaging Zang-Fu, skin gathers, hair falls, menstruation stops, and vessels are damaged. After seventy days, eating flesh and blood, parasites are yellow-red; food fails to nourish flesh, sinews relax. After one hundred twenty days, eating flesh/blood completely, parasites are purple; eating marrow, transmitting to Kidney, parasites are black; eating marrow causes bone atrophy and inability to rise. Long-term parasites grow multicolored hair, absorbing Five Zang/Five Element Qi; transmitting to three people, they can fly. Entering Kidney Meridian is untreatable. Purging parasites: if white, supplement for thirty days; if yellow-red, for sixty days; if purple-black, deeply diseased, supplement for one hundred twenty days. Within sixty days, seven or eight out of ten are cured; within eighty days, three or four out of ten; beyond this, survival is uncertain. (Attributed to *Dao De Jing* commentary/medical text)

In Xu Lao, boils appearing at the anus are called Gang Yong (Anal Abscess). If the pulse is not rapid, it is still serious; if rapid, it is worse. Lung governs the upper opening (Xi Men), Large Intestine governs the lower opening (An Men); they are internally-externally related. Lung is master of Qi; Yang Qi should ascend. Deficiency causes sinking, as things reverse at extremes. Now, internal heat burns, Lung Qi is long injured, sinking into the anus causing Gang Yong. Lung injury is extreme; medicine cannot save it. This is what *Jing* calls "sunken meridians causing Wei syndrome." (Wang Shishan)