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Liu Baozhi's commentary: Zhang Luyu (courtesy name Shiwan), beyond Zheng Shanghan (Standard Cold Damage), detailed various seasonal external contractions and diseases resembling Shanghan, compiling theories from various schools with thorough documentation. His discussions were indeed comprehensive. However, regarding Dongwen (Winter Warmth), Chunwen (Spring Warmth), Wenyi (Warm Epidemic), and other warm-heat diseases, he failed to trace their origins and analyze them systematically, leaving students confused. Herein, I excerpt several passages concerning warm-heat diseases for detailed critique, so that readers are not misled by old theories.

Shanghan (Cold Damage) refers to illness caused by contracting severe cold and lethal qi during winter. From after the Frost Descent solar term to before the Spring Equinox, if headache occurs upon onset, it is called Zheng Shanghan (Standard Cold Damage). This disease involves transmission through the Six Meridians, combined diseases (Hebing), and concurrent diseases (Bingbing). Its treatment follows Zhang Zhongjing's *Treatise on Cold Damage* (*Shanghan Lun*) as the standard.

Liu Baozhi's commentary: Zheng Shanghan is rare in the South; even when it occurs, severe cases are uncommon. Most severe and dangerous external contraction diseases are actually warm-heat diseases.

If one suffers from "Lianggan" (simultaneous involvement of exterior and interior meridians by cold), on the first day, Taiyang and Shaoyin meridians are involved together; on the second day, Yangming and Taiyin meridians are affected simultaneously; on the third day, Shaoyang and Jueyin meridians are affected simultaneously. When the patient cannot take fluids or food and loses consciousness, death occurs on the sixth day. However, Lianggan in Shanghan is rare; warm diseases and heat diseases are far more common. Warm-heat pathogens emerging from Shaoyin and affecting Taiyang constitute a form of Lianggan. Therefore, Liu Wansu (courtesy name Shouzhen) specifically created formulas such as Liange San (Cooling Pavilion Powder), Shuangjie San (Double Resolution Powder), Baihu Tang (White Tiger Decoction), and Chengqi Tang (Descending Qi Decoction) to resolve both exterior and interior heat toxins simultaneously.

Liu Baozhi's commentary: Shiwan often claimed that warm diseases must originate from the Shaoyang meridian, using Chaihu-based formulas initially. Yet here he states Shaoyin emerges to Taiyang, indicating his failure to clearly distinguish the origin of warm diseases, leading to imprecise therapeutic views. Moreover, "Lianggan" involves the combination of internal and external pathogens, whereas warm-heat diseases arise from within reaching outward. Although external symptoms may appear similar, their origins differ fundamentally and should not be compared.

During winter, unseasonable warmth may occur. This belongs to spring yang energy activating prematurely in winter, constituting abnormal qi. Contracting this leads to Dongwen (Winter Warmth). Symptoms invariably include vexation, vomiting, sore throat, fever, headache, cough with spontaneous sweating, heavy head, or facial swelling. If sore throat appears initially, diarrhea will likely follow because the pathogen enters the Shaoyin meridian, which ascends along the throat and descends into the abdomen. Treatment uses Yangdan Tang plus Jiegeng (Platycodon Root) and Weirui (Polygonatum Rhizome).

Liu Baozhi's commentary: This describes external contraction of wind-warmth, occurring occasionally between winter and spring. Ye Tianshi (courtesy name Xiangyan) stated, "Warm pathogens enter from above, first attacking the Lung." Wu Jutong's mild acrid-cool formulas, such as Yinqiao San (Honeysuckle and Forsythia Powder) and Sangju Yin (Mulberry Leaf and Chrysanthemum Decoction), fit these conditions perfectly. The primary treatment must focus on clearing and draining the Lung meridian. If yin is damaged, Dihuang (Rehmannia Root), Maidong (Ophiopogon Tuber), and Xuanshen (Scrophularia Root) can be added according to symptoms, as Wu Jutong noted. Yangdan Tang contains Guizhi (Cinnamon Twig), which is warming; it is only appropriate if Taiyang syndrome symptoms like aversion to cold and stiffness/pain of the head and neck are present. If such symptoms exist, it is not a warm disease caused by warm pathogens injuring the Lung, but rather a warm disease caused by latent cold erupting internally. The contradictions arise from unclear understanding of meridian theory.

After the Spring Equinox, when weather becomes warm, individuals suffering from high fever have a warm disease. The Classic states: "Injury by cold in winter leads to warm disease in spring." Zhang Zhongjing stated: "Taiyang syndrome with fever and thirst, without aversion to cold, is a warm disease." This occurs because latent pathogens from winter activate with the warming qi of the season. Causes of activation vary: some due to sudden unseasonable cold, some due to dietary irregularities or overwork, some due to sexual indiscretion. Since the external pathogens differ, the meridians affected also vary. As stated, the pulse of warm diseases moves through various meridians, making it unclear which meridian is disturbed; treatment should follow the specific meridian symptoms.

Liu Baozhi's commentary: These lines thoroughly explain the origin and progression of warm diseases; what could be criticized?

Whenever warm diseases manifest, there is typically intense thirst, restlessness, hypochondriac fullness, bitter taste, aversion to heat rather than cold, and a stronger pulse at the Cun Kou (radial artery) compared to Ren Ying. This clearly indicates latent pathogens moving from interior to exterior, necessarily starting from the Shaoyang meridian. If triggered by external cold, Xiaochaihu Tang (Minor Bupleurum Decoction) should be modified based on observed meridian symptoms. Without external pathogens, Huangqin Tang (Scutellaria Decoction) is indicated. Warm diseases often involve transmission and combination, rarely sparing the Shaoyang meridian. For Taiyang-Shaoyang combined disease, use Huangqin Tang; for Shaoyang-Yangming combined disease, use Chengqi Tang; for Three Yang combined disease, use Chaihu Tang or modified Shuangjie San. For all Three Yang exterior syndromes with vexation, heat, and thirst, Huangqin Tang-type formulas are suitable. Based on combined disease treatments, transmission patterns can be inferred.

Liu Baozhi's commentary: This section on warm disease diagnosis and treatment is quite accurate. However, claiming latent pathogens must reach the exterior via Shaoyang adheres too rigidly to old theories and does not fit clinical reality. It contradicts the earlier statement that warm pathogens move through various meridians unpredictably.

Treating warm and heat diseases generally lacks a rationale for standard diaphoresis (sweating), as pathogens emerge from within without clear exterior signs. If symptoms clearly indicate sudden unseasonable cold with aversion to cold, headache, and tight pulse, pure exterior-releasing drugs should not be used alone. Instead, Zhichi Tang (Gardenia and Fermented Soybean Decoction) or Yi Yuan San plus Bohe (Mint), Congbai (Green Onion White), and Chishao (Red Bean) may be used. In severe cases, Liangge San minus Xiaoshi (Mirabilite) and Dahuang (Rhubarb), plus Congbai and Chishao, administered via induced vomiting to induce sweating, is optimal. This stifled heat erupts with spring warmth; even with unseasonable cold, only acrid-ping (neutral) dispersing agents are appropriate.

Liu Baozhi's commentary: Using Congbai and Chishao to induce sweating is safest for early-stage warm pathogens; induced vomiting is unnecessary.

Before or after purgation, or after sweating, if residual heat persists causing profuse sweating, although excess heat is gone, lingering pathogens remain. Small doses of Huangqin Tang or Jiedu Tang (Detoxification Decoction) can regulate this.

Liu Baozhi's commentary: For patients with insufficient yin fluids, formulas clearing and nourishing stomach yin are best.

If after purgation, thirst decreases but hunger arises, it indicates latent pathogens have just dispersed, allowing ministerial fire to disturb due to deficiency. This is common after purging warm diseases; do not immediately give porridge or drinks, as eating causes relapse.

Liu Baozhi's commentary: Modern practitioners often misunderstand this, leading to frequent relapses.

If after purging warm diseases, heat persists and lower-jiao excess signs remain, repeated purgation is permissible until heat subsides.

Liu Baozhi's commentary: In Shanghan, stools are usually hard; purgation should be strong. Rarely is consecutive purgation needed. In warm diseases, stools are sticky and dark like paste; purgation should be gentle. After purging, if turbid heat reaccumulates after one or two days, purgation should resume. Some require three to four days of purging to clear; one cannot say previously purged cases should not be purged again.

If after purging, heat persists with choppy pulse, sore throat, chest fullness, and excessive sweating, heat has injured the blood level. Tingli Kujiu Tang (Descurainia and Vinegar Decoction) via induced vomiting is indicated.

Liu Baozhi's commentary: For heat injuring blood, nourishing blood to transform residual heat is correct, using Shengdi (Rehmannia Root), Xuanshen, Jinyinhua (Honeysuckle Flower), Xijiao (Rhinoceros Horn - now substituted), Yangshen (American Ginseng), Zhuru (Bamboo Shavings). Tingli and vinegar methods are absolutely contraindicated.

"Jiaoyang" (Transition to Yang) does not mean yin-cold transforming into yang. It means stifled heat accumulates internally, reaches extreme stagnation, and then transitions outward to the exterior yang level, resulting in sweating. If stagnation prevents emergence, it signifies extreme yin blocking yang, where righteous qi declines, yin exhausts first, and yang exhausts subsequently, leading to death.

When sweating is desired but the pulse suddenly sinks and hides, it is because yang qi merges inward. Transitioning to yang with restlessness and coma results from extreme internal heat stagnation disturbing the spirit. In "Zhanhan" (shivering sweating) that is ineffective or shivers without sweating, the merging of qi is incomplete, so the disease persists despite shivering. Generally, Sanyi Chengqi Tang or a combination with Huanglian Jiedu Tang should be used to dissipate stifled heat and open stagnation. During Zhanhan, frequently giving hot ginger soup aids development best, avoiding ineffective shivering and lack of sweat.

Liu Baozhi's commentary: Ginger promotes heat; Mugen (Imperata Rhizome) is superior.

For purgable syndromes, some sweat immediately after purging; some experience sudden opening of stagnation after medication, sweating first then having bowel movements; some pass stool merely accompanying sweat, achieving harmony and recovery without needing purgation; some die from ineffective shivering and blocked transition; some sweat without shivering; some recover with only shivering and no sweat. Laypeople mistake aversion to cold and shivering for yang deficiency and yin excess, leading to many mis-treatments.

Liu Baozhi's commentary: In ambiguous situations like these, life and death hang in the balance; careful attention is required.

Warm diseases originating in the Three Yin meridians with faint pulses and cold feet are mostly difficult to treat.

Warm diseases with high fever but surprisingly fine/small pulses and cold extremities are fatal signs.

In early warm diseases, high fever with delirium, intense heat with small pulses and cold feet, progressing after five to six days to rapid/agitated pulses, vomiting, lethargy, black scorched tongue root, hemorrhage with agitation and large pulses, spasms/confusion, or hurried/intermittent/deep/small pulses are all fatal.

In warm-heat diseases, high fever without sweating is fatal; sweating followed by increased heat and agitated pulses is also fatal. Misusing diaphoretics in warm diseases leading to delirium, inability to eat, and agitated pulses are untreatable.

Liu Baozhi's commentary: The untreatable conditions listed fall into three categories: 1. Pathogens stagnant and unable to exit; 2. Righteous qi too weak to expel pathogens; 3. Yin fluid scorched and exhausted.

After Summer Solstice, when summer heat dominates and Minister Fire is active, fever with body pain, aversion to heat but not cold, and intense thirst constitutes Rebing (Heat Disease). The *Shanghan Example* states: "Cold damage turning into warm disease before Summer Solstice is Wenbing; after Summer Solstice is Rebing." Long-latent pathogens activate with seasonal summer heat. Since the pathogen is not externally acquired, there is aversion to heat but not cold. Heat originates internally, causing dry mouth and excessive drinking. Since the pathogen is constrained as heat, acrid-warm diaphoretics are unsuitable; it cannot be classified as cold. Zhang Zhongjing still calls it Shanghan because initial infection was caused by cold qi stagnation. People claim Zhongjing lacked warm-heat treatments; yet look at Huangqin Tang and Baihu Tang in the Taiyang and Yangming chapters—are these not for warm diseases? Baihu Tang, associated with Metal, is inappropriate unless in peak summer heat with extreme internal and external heat. Using it in qi-deficient patients often causes JieXiong (Chest Binding), sometimes fatal. Hence, warnings against using Baihu Tang before Start of Summer or after End of Heat. Just as Shanghan cannot use Huangqin or Baihu, warm diseases cannot use Mahuang (Ephedra), Guizhi, or Qinglong Tang (Green Dragon Decoction). Even for treating warm diseases, they are only applicable if accompanied by unseasonable sudden cold.

Liu Baozhi's commentary: This section clarifies that Huangqin and Baihu were originally designed by Zhongjing for warm diseases, not Shanghan. However, the concluding restriction on these formulas, while theoretically sound, somewhat overshadows the proper treatment principles for heat diseases.

If warm diseases last seven to eight or ten-plus days, with previous pathogens unresolved and re-contracted cold, alternating chills and fever become Wen Nue (Warm Malaria), considered a complicated condition in medical texts. The *Shanghan Example* states: "Pulses both yin and yang are vigorous, re-contracting cold transforms into Warm Malaria." Symptoms include chest/hypochondriac fullness, vexation/thirst/vomiting, slight aversion to cold; treat with Xiaochaihu Tang removing Renshen (Ginseng) and Banxia (Pinellia), adding Gualougen (Trichosanthes Root) and Shigao (Gypsum). If no cold but heat, normal pulse, bone joint pain, occasional vomiting; use Baihu Tang plus Guizhi. Strictly avoid acrid-warm dispersants to prevent aggravating the disease.

Liu Baozhi's commentary: For the former symptoms (vexation/thirst/slight aversion to cold), Baihu Jia Guizhi Tang is appropriate; for the latter (heat only, no cold), Guizhi should not be added.

Regarding the *Neijing* description of Warm Malaria with heat preceding cold: contracted wind in winter, cold qi stored in bone marrow. In spring, abundant yang fails to expel the pathogen. Encountering intense summer heat dries brain marrow, consumes muscle, opens pores, or exertion forces pathogen out with sweat. The disease resides in the Kidney, emerging from interior to exterior. Thus, yin deficiency and yang excess cause heat. When declining, qi returns inward, causing yang deficiency and cold. Hence, heat precedes cold, named Warm Malaria. Treatment uses Renshen Baihu Tang; if external pathogens exist, add Guizhi. Alternatively, use Jin Gui Shen Qi Wan removing Fuzi (Aconite), doubling Guizhi as a decoction, taken when thirsty. Since heat erupts from Kidney, internal heat is intense; urgently use Baihu to reduce heat. As malaria intensity wanes externally and returns to Kidney, yin essence contends, resulting in cold. If one fails to strengthen water to save yin, yin essence exhausts after numerous attacks. This spontaneous latent-pathogen warm disease differs essentially from Warm Malaria caused by re-contracted cold after warm disease, though both relate to the Shaoyin meridian. Detailed distinction resolves confusion.

Liu Baozhi's commentary: Although origins differ slightly, both require saving yin and reducing heat similarly. However, the former involves new cold contraction, requiring consideration of dispersing pathogens for completeness.