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Xu Lao (Consumptive Disease), originating from excessive debauchery and depletion, causes severe damage to the Liver and Kidney, often leading to loss of blood and essence, ultimately resulting in death due to Yin exhaustion; originating from emotional depression and stagnation, internal fire scorches body fluids, often leading to blood stasis and dry cough, developing into carbuncles and death; originating from medication errors, the Spleen and Stomach suffer various diseases, often progressing to reduced appetite, wheezing and coughing, diarrhea, and death. If the complexion does not appear declining, muscles waste away daily, externally appearing healthy but internally truly deficient, commonly known as Tao Hua Zhu (Peach Blossom Plague), this is because Yin fire attacks Yang positions, not only consuming fluids of the Yang aspect, but also forcing fluids of the Yin aspect to desperately supply the Yang fire for consumption, thus muscles waste away daily while the complexion appears increasingly lustrous. (From *Zhang Shi Yi Tong*)

Supplement:
For those who frequently lose essence, there is tightness and urgency in the lower abdomen, coldness at the glans penis, dizziness, hair loss, and a pulse that is extremely deficient, cun Kou (hollow) or slow, indicating clear feces (undigested food in stool), loss of blood, and loss of essence; if the pulse presents with various cun Kou, moving, faint, or tight characteristics, with men losing essence and women experiencing sexual dreams, Gui Zhi Long Gu Mu Li Tang (Cinnamon Twig Decoction with Dragon Bone and Oyster Shell) is the primary treatment. ○ For Xu Lao accompanied by abdominal tightness and discomfort, palpitations, epistaxis, abdominal pain, nocturnal emission, soreness and pain in the four limbs, vexation and heat in the hands and feet, dry throat and mouth, Xiao Jian Zhong Tang (Minor Construct the Middle Decoction) is the primary treatment. ○ For Xu Lao accompanied by abdominal tightness and deficiency of all aspects, Huang Qi Jian Zhong Tang (Astragalus Decoction to Construct the Middle) is the primary treatment. ○ For Xu Lao accompanied by lower back pain, tightness and urgency in the lower abdomen, and difficulty urinating, Ba Wei Shen Qi Wan (Eight-Ingredient Kidney Qi Pill) is the primary treatment. ○ For Xu Lao accompanied by vexation and insomnia, Suan Zao Ren Tang (Sour Jujube Seed Decoction) is the primary treatment. ○ When the Five Labors lead to extreme deficiency, emaciation, abdominal fullness, inability to eat, caused by dietary injury, emotional injury, drinking injury, sexual injury, and hunger injury, damaging meridians, Ying Blood, and Wei Qi, with dry blood inside, rough skin like scales, and dark eyes, the treatment should moderate the middle and tonify deficiency, using Da Huang Ze Chong Wan (Rhubarb and Ground Beetle Pill). ○ For Xu Lao with various deficiencies and susceptibility to wind pathogens causing myriad diseases, Shu Yu Wan (Dioscorea Pill) is the primary treatment. ○ Qian Jin Yi Fang's Zhi Gan Cao Tang (Honey-Fried Licorice Decoction) treats Xu Lao deficiency with sweating and chest oppression, knotted and intermittent pulse, and palpitations; if movement is normal, recovery occurs within 100 days; if critical, death occurs in 11 days. ○ Zhou Hou Fang's Ta Gan San (Rabbit Liver Powder) treats Cold Lao (Cold Consumptive Disease) and also Ghost Zhu (Plague transmitted among family members). (From *Jin Gui Yao Lue*)

Note: The phrase "moderate the middle and tonify deficiency" should be placed after "inability to eat"; this is likely a transcription error. (From *Yi Zong Jin Jian*)

Lao Zhai (Tuberculosis-like disease) primarily belongs to Yin deficiency. From Zi hour to Si hour belongs to Yang, from Wu hour to Hai hour belongs to Yin; Yin deficiency leads to heat occurring in the afternoon and before Zi hour. Being awake belongs to Yang, sleeping belongs to Yin; Yin deficiency leads to night sweats during sleep. Ascension belongs to Yang, descent belongs to Yin; Yin deficiency leads to Qi failing to descend, causing phlegm and saliva to rebel upward continuously. Floating pulse belongs to Yang, deep pulse belongs to Yin; Yin deficiency leads to a surging and large pulse on superficial pressure and emptiness on deep pressure. These are all signs of Yin deficiency, primarily treated with Si Wu Tang (Four Substances Decoction) plus Zhi Mu (Anemarrhena Rhizome) and Huang Bai (Phellodendron Bark). Physicians follow this without effect; why? Because Yin deficiency causes fire to flare upward; Chuan Xiong (Sichuan Lovage Rhizome) and Dang Gui (Angelica Sinensis) have acrid-warm properties, not suitable for nourishing and descending deficient fire; moreover, Chuan Xiong is acrid and dispersing, unsuitable for those with deficient fire and shortness of Qi; Di Huang (Rehmannia Root) is cloying and obstructs the diaphragm, unsuitable for those with stomach heat, poor appetite, and much phlegm. Zhi Mu and Huang Bai are bitter and cold; although said to nourish Yin, they are actually drying and deplete blood; although said to descend fire, bitterness enters the Heart first, and long-term use increases Qi, potentially aiding fire. Their damaging the Stomach goes without saying. (Zhu Danxi)

"Lao" means labor/damage, referring to the damage of Qi and Blood. Since Qi and Blood are damaged, it is great deficiency, hence named Xu Lao (Deficiency-Labor). Since it is named deficiency and labor, tonification and nourishment are necessary. Why do modern physicians treat this condition as if forgetting its name, renaming it Huo Lao (Fire Labor), lacking any tonifying function, focusing solely on clearing fire, and further misidentifying it as Excess Fire, prioritizing directing Qi downward? They indiscriminately use Xuan Shen (Scrophularia Root), Hua Fen (Trichosanthes Powder), Zhi Mu, and Huang Bai for clearing fire, and Sang Bai Pi (Mulberry Root Bark), Bai Qian (Cynanchum Root), Su Zi (Perilla Seed), Xuan Fu Hua (Inula Flower), Zhi Ke (Aurantium Fruit), and Lai Fu Zi (Radish Seed) for directing Qi downward. For hemoptysis in Xu Lao, they use Qian Gen (Rubia Root) and Xiao Ji (Cirsium Herba); for cough, Zi Wan (Aster Root), Bai Bu (Stemona Root), Pi Pa Ye (Loquat Leaf); for expectoration, Mai Dong (Ophiopogon Tuber), Bei Mu (Fritillaria Bulb); for tidal fever, Qing Hao (Artemisia Annua), Bie Jia (Carapax Trionycis), Di Gu Pi (Lycium Bark), Yin Chai Hu (Stellaria Root). Taking these until Spleen damage causes abdominal distension, poor appetite, and diarrhea, they add Gu Ya (Sprouted Grain) and Shi Hu (Dendrobium Stem) as spiritual pills for the Spleen; taking these until Lung damage causes asthma and inability to lie on either side, they add Bai He (Lily Bulb) and Sha Shen (Glehnia Root) as divine agents for protecting the Lung. If ineffective, they continue administering them, worsening the condition until critical, with Qi and Blood daily depleted, True Yuan exhausted, pulse barely a thread, breath lingering, yet still claiming "fire exists, cannot tonify." Alas! Tonification may be contraindicated, but is death acceptable? Although Danxi excelled in medicine, his prescription of Liu Wei Di Huang Wan plus Zhi Mu and Huang Bai for consumptive disease has harmed future generations. Yet this is less harmful than the daily use of so many cooling, descending, and damaging drugs. Where do these methods come from? Upon seeing hemoptysis, cough, or fever, doctors blindly apply these standard formulas. This applies to quacks and famous physicians alike. Patients believe there is no other method, persist until death. Doctors remain indifferent, never changing strategy, which is lamentable. In my practice, for cases with fine-rapid pulse, emaciation, inability to lie on either side, indicating Liver-Lung damage and Spleen-Kidney failure, I leave them to fate. Otherwise, observing the degree of deficiency and tonifying/nourishing often results in survival, proving effective. But doctors insist "fire exists, cannot tonify," and patients agree. Knowing these five words means "inevitable death, incurable." Consider how many use cooling/descending methods for Lao; among hundreds, how many survive? I have seen none. (Wu Tianshi)

Human deficiency involves either Qi or Blood, encompassing all Zang-Fu organs. Specifically highlighting Spleen and Kidney is because Water is the origin of all things, Earth is the mother of all things; if these two organs are harmonious, the body is governed, and diseases do not arise. The Spleen possesses Earth virtue; when Spleen is harmonious, Earth becomes the mother of Metal, Metal solidifies Water source, and Earth does not overwhelm Water, allowing Water to reside peacefully. Thus, Spleen harmony ensures Kidney harmony. The Kidney contains both Water and Fire; when Kidney is harmonious, Water does not carry Liver Wood upward to overwhelm damp Earth, and Fire benefits Spleen Earth in transportation and transformation, generating essences. Thus, Kidney harmony ensures Spleen harmony. Sun Simiao said: Tonifying Spleen is better than tonifying Kidney. Xu Xueshi said: Tonifying Kidney is better than tonifying Spleen. Both masters understood these two organs as the root of life, having mutual assistance functions; their statements seem contradictory but share the same essence. To save the Kidney, one must base on Yin Blood; Blood moistens, belongs to Yin, and descends; deficiency causes ascending, requiring astringency and suppression, such as Liu Wei Wan (Six-Ingredient Pill). To save the Spleen, one must base on Yang Qi; Qi warms, belongs to Yang, and ascends; deficiency causes sinking, requiring lifting and raising, such as Bu Zhong Yi Qi Tang (Tonify the Middle and Augment the Qi Decoction). Modern treatments for Lao focus solely on Si Wu Tang plus Zhi Mu and Huang Bai, ignoring that autumn/winter energies do not generate all things. Danxi stated: Excess fire can be purged, deficient fire can be tonified. Is the fire in Lao excess or deficient? Can it be purged? Correcting bias by using Gui Zhi (Cinnamon Twig) and Fu Zi (Aconite Root) regularly suits only those with fire decline. For those with blood deficiency and Qi heat, this will surely aid fire harm. Generally, Xu Lao has many difficulties. Tonifying Spleen and protecting Lung should proceed together, but Spleen likes warm-dry, Lung likes clear-moist; protecting Lung hinders Spleen, tonifying Spleen hinders Lung. Only in severe dry-heat with good appetite and no diarrhea should Lung moistening be urgent, while Spleen tonification remains essential. If emaciated with poor appetite and frequent diarrhea, even with asthma/cough, prioritize Spleen tonification and avoid clear-moist agents. Spleen generates Lung; Lung does not support Spleen; thus Spleen tonification is more important. Regarding tonifying Kidney and regulating Spleen, both should be done, but sweet-cold for Kidney may harm Spleen if appetite is low; acrid-warm for Spleen may consume Water if Yin is damaged. Weighing both, prioritize Spleen because Earth connects to Heart above and Kidney below. If Kidney is severely deficient and critical, flexibility is needed. As "without Yang, Yin cannot generate; without Yin, Yang cannot transform," balance is key. Dongyuan said: Sweet-warm can remove great heat. Also: Blood loss requires tonifying Qi; solitary Yin does not grow; deficiency requires Ginseng's sweet-warm to tonify, following the principle of Yang generating Yin. Those who can accept tonification are treatable; those who cannot are not. Ge Kejiu used Ginseng in 7 of 10 Lao prescriptions; Danxi used Ginseng in 7 of 10. After Li Dongyuan's theory of Lung heat damaging Lung and Jiezhai's claim that Ginseng causes death, many stubbornly use bitter-cold until vomiting/diarrhea occur, which is tragic. Lung heat with excess pulse is incompatible with Ginseng, but Fire attacking Metal with deficient pulse requires Ginseng to preserve. Ancients said: Earth prosperous generates Metal, do not obsess over protecting Lung; Water strong extinguishes Fire, do not rush to clear Heart. This thoroughly understands the Classics' intent and grasps fundamental treatment. (Li Shicai)

Treating deficiency has three roots: Lung, Spleen, and Kidney. Lung is the sky of the five Zang organs, Spleen is the mother of the hundred bones, Kidney is the root of life and nature; the way to treat deficiency is complete. Dongyuan emphasized Spleen-Stomach as paramount; Danxi emphasized Yin-nourishing as the root of Lao treatment; Lizhai clarified tonifying Fire, stating that once the sun shines, Yin fire naturally dissipates. These three sages were virtuous but focused on one aspect, lacking comprehensive application. Therefore, Dongyuan's *Pi Wei Lun* (Treatise on Spleen and Stomach) is sound, but rigid adherence uses drying agents to tonify Earth, harming Clear-Metal. Danxi's Yin-nourishing theory has flaws; rigid adherence uses bitter-cold to descend fire, hindering Central Earth transformation. "Yang is often sufficient, Yin is often insufficient" is a biased view; followers use Zhi Mu and Huang Bai for Yin-deficient Yang-hyperactivity, failing to generate Water and instead extinguishing it. Kidney is Kan trigram, one Yang trapped in two Yins; two Yins are True Water, one Yang is True Fire. True Water generates Liver Wood, Liver Wood generates Heart Fire; True Fire generates Spleen Earth, Spleen Earth generates Lung Metal. Life originates from below, like Fuxi's Bagua. Kidney combines Water and Fire as the root of Zang-Fu; True Water cannot be extinguished, nor can True Fire alone be quenched. However, some rigidly follow Lizhai's fire-tonifying theory, using Cong Rong (Cistanche), Lu Rong (Deer Antler), Gui Zhi, and Fu Zi, ignoring郁火 (stagnant fire/heat) or prior Lung damage. Deficient fire can be tonified, e.g., Bu Zhong Yi Qi Tang uses sweet-warm herbs to remove great heat. Without clear Yang sinking, Sheng Ma and Chai Hu are avoided; using overly acrid-hot herbs for stagnant fire is like adding fuel to fire. I advocate holding both ends to use the mean, balancing three regions: First, clear Metal and protect Lung without offending Central Earth (using Danxi without rigidity). Second, cultivate Earth and regulate Middle without damaging high Qi (using Dongyuan without rigidity). Third, Metal clears and transforms, Water flows long, integrating Metal and Water. While Spleen and Kidney are well-expounded, Lung protection lacks depth, so I elaborate on Lung. These are the three roots of treating Lao to investigate. (He Dexiu)

The *Jin Gui* places Xu Lao under Blood Bi, showing that Lao inevitably damages Jing and Blood. Ying Blood injury causes internal heat, constant heat in five centers, visual disturbances, tinnitus, food failing to nourish flesh, lethargy, weak bones/sore feet, slow Ying flow, fast Wei flow. Ying Blood, pressured by Wei Qi, fails to stay inside, leaking out via vomiting, epistaxis, or orifices. Massive blood loss allows fire to enter, boiling and scorching endlessly, leading to immediate exhaustion of Ying Blood. Extreme Lao causes Blood Bi where blood accumulates internally rather than leaking. Long accumulation blocks all channels, causing dryness. Skin may be smooth, face lacks luster. Qi passes but blood does not move, steaming blood into heat, occurring at dusk or midnight. Initial dry heat resolves with slight sweat, but continuous steaming forms Zhai disease. Initial blood loss later causes Blood Bi; blood deficiency makes stasis easy. Fever exacerbates bi. *Nei Jing* mentions deficiency but not specifically Lao, though descriptions of skeletal wasting and muscle collapse imply it. Qin Yueren initiated theories on Xu Sun (Deficiency Damage): Cold invasion damages Yang (top-down); Heat invasion damages Yin (bottom-up). Top-down exceeding Stomach is incurable; bottom-up exceeding Spleen is incurable. Abundant diet generates blood; scarce diet stops blood generation, leading to Yin-Yang imbalance and five Zang damage. Yueren valued Spleen-Stomach highly. *Jin Gui* states essence comes from grain; little grain means little blood, little blood means no essence. *Nei Jing* says: Essence deficiency requires flavor-rich tonics. With dietary regulation and rest, essence stores enrich, preserving life. Ten maxims address young men with dual deficiency. Blood failing to transform essence causes Blood Bi; Bi causes Ying deficiency; deficiency causes heat; prolonged heat steams stasis into worms, forming Chuan Shi Zhai (Transmissible Tuberculosis). Huo Er (Erosive ulcers) and Lao Zhai both cause hoarseness, indicating worm erosion of airways. Zhang Zhongjing warned healthy men about Ying-Wei之道 (Way), emphasizing grain intake for solidity. Regulating Ying-Wei stabilizes grain; accumulating essence strengthens constitution. Regulating desires generates essence. At early stages, Jian Zhong and Fu Mai decoctions (sweet/grain-based) follow "tonify essence with flavor." Later methods fail frequently. When Bi sets in, Zhongjing expels old to generate new, intervening before Lao Zhai fully forms—a unique holy method. Children's fragile organs easily form masses from cold/heat/stagnation; waiting for Bi/fever is too late. Women with dry blood amenorrhea and fever show more Lao signs; waiting is futile. Following Zhongjing's preemptive wisdom saves lives, resurrecting the dead. ○ Xu Sun has easy and difficult recovery: Illness-induced deficiency recovers slowly; deficiency-induced damage is hard to recover. Illness-to-deficiency uses Dongyuan/Danxi methods; deficiency-to-damage with exhausted Yuan Qi requires Danxi's massive Ginseng Paste doses for survival. (Yu Jiayan)

Xu Lao damages Yin, originating from five Zang organs. Each Zang has specific governance, but treatment is divisible and indivisible. Qi damage treats Lung; Spirit damage treats Heart; Diet/Muscle damage treats Spleen; Blood/Tendon damage treats Liver; Essence/Marrow damage treats Kidney. This is divisible. However, Qi governs Lung but transforms from Essence; Spirit governs Heart but transforms from Qi; Muscle governs Spleen but Earth generates from Fire; Blood stores in Liver but generates from Spleen-Stomach; Essence/Marrow governs Kidney but receives from five Zang. This is indivisible. Severe cases transmit between root and branch, affecting multiple organs, making fixed formulas impossible. Tonification must clarify Yin-Yang ascent/descent and hot/cold natures, understanding essence contains Qi and Qi contains Essence. Upper Jiao Yang deficiency sinks to Kidney, requiring extraction from lowest Yin; Lower Jiao True Yin deficiency floats upward, requiring guidance back to origin. Seeking the root is perfect treatment. (Zhang Jingyue)

Congenital Yang deficiency tonifies Ming Men; Acquired Yang deficiency warms Stomach Qi. Congenital Yin deficiency tonifies Kidney Water; Acquired Yin deficiency tonifies Heart and Liver. ○ Ancient "Lao Fa" (Labor Fever) refers to fatigue preventing consolidation, causing Yuan Yang to float outward (Dongyuan's Internal Injury). Dispersion exhausts Yuan Yang; Bitter-Cold kills deficient Yang. ○ True Yin deficiency leaves solitary Yang unrooted, prone to floating; treat with sweet-warm/quiet agents to nourish, sour-salty/astringent agents to store. People know "excess Qi is fire," but not "excess fire is Qi," manifesting as asthma/fullness or vexation. Excess here refers to pathogenic Qi, indicating righteous Qi deficiency. Dietary stagnation can be promoted/drained/smoothed/regulating. Floating Yang requires guiding/nestling/astringing/sealing, using tonification as elimination. This Qi is the root of life, unlike dietary stagnation. Promoting Qi drugs leak Yuan Qi; Acrid-Dry drugs deplete fluids; even acrid-moist drugs like Shao Yao, Dang Gui, Chen Pi can stir rootless Qi and rising fire. Damaged Yuan Qi weakens Stomach Qi; fragrant foods taste bad then; medicinal flavors are worse. Despite opening appetite benefits, risk of damaging Spleen/Stomach exists; thus strictly avoid. ○ Extreme deficiency with confusion regarding nearby people but awareness of distant events, or seeing ghosts/dead, indicates Yang collapse called You Hun (Wandering Soul). Urgently tonify and astringe; when Shen-Hun settles, visions cease. ○ Critical deficiency dying after craving meat/rice indicates Spleen deficiency and fluid exhaustion; meat lacks power to rescue. Spleen deficiency seeks grain help; fluid exhaustion seeks fat/grease help. Only thick Ginseng Soup can rescue. Grain/meat fill tangible voids but cannot replenish intangible exhaustion. (Feng Chuzhan)