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This treatment method is flexible and adaptable. If swallowing is difficult when eating, it indicates that the pathogenic factor is not in the Stomach; if there is no desire to eat because of unconsciousness, it is due to clouding of the mind (Shen Hun). Since the heat pathogen is not in the Stomach, mistakenly using Chengqi Tang (Cinnamon Twig and Rhubarb Decoction) to purge will inevitably lead to death.

According to the theory of Cold Damage (Shanghan), disease transmission originally occurs only through the Foot meridians. The subsequent examples regarding transmission to the Hand meridians reveal the mysteries of disease pathogenesis. Generally, this occurs because pathogens accumulate over a long period, resulting in excess in the Foot meridians and deficiency in the Hand meridians, leading to stagnant heat. Transmission may result from errors in sweating or purging methods, or from emotional disturbances or fatigue. Transmission to the Hand meridians always has specific causes; thus, ancient physicians developed methods such as Jiu Ni (Rescuing Deviation) and Fu Mai (Restoring the Pulse). These not only address the condition accurately but also establish principles for future generations.

Generally, Cold Damage diseases arise from wind-cold. Initially, wind-cold invades the exterior; once it enters the interior, it cannot dissipate naturally. With appropriate warming and covering, it should dissipate. If one intends to attack the interior without addressing the syndrome, one must first resolve the exterior before purging. If the exterior is resolved but internal stagnation persists, unless there is significant fullness, chills and fever will remain, and the disease will not be cured. However, if the exterior is resolved and internal stagnation presents with severe fullness, solid excess, hardness, and dry feces, purging is appropriate. Even if four or five days have passed, this will not cause harm. Conversely, if purging is inappropriate and forced, internal deficiency allows heat to enter, leading to diarrhea with heat, irritability, and numerous other complications. Mild cases become critical, and severe cases result in death.

When Yang is excessive and Yin is deficient, sweating leads to death, while purging leads to recovery. When Yang is deficient and Yin is excessive, sweating leads to recovery, while purging leads to death. Thus, how can Shen Dan (Divine Pill) be mistakenly induced? How can Kansui Root (Radix Kansui) be recklessly attacked? Treatments for deficiency and excess are opposites, leading to outcomes separated by thousands of miles. The key to life and death lies in an instant; caring for the patient leaves no time to count days. This interplay of Yin-Yang and deficiency-excess presents subtle signs; opposing treatments like sweating, vomiting, and purging bring rapid disaster. Physicians with shallow knowledge, ignorant of the disease source, treat erroneously, causing patients' deaths while believing it their fate. Until vengeful spirits fill the underworld and corpses fill the wilderness, benevolent people witnessing this cannot help but grieve.

In cases of Liang Gan (Double Exposure) where both exterior and interior are affected simultaneously, treatment must follow a sequence; resolving the exterior and attacking the interior are fundamentally different. Yet, obstinate practitioners claim that combining Shen Dan and Kansui can resolve both. Although their words seem clever, they violate medical principles. The actions of the wise often appear foolish to the unwise. If this method truly determined safety quickly, would it not be miraculous? Most people pursue worldly glory and ignore impending danger. Only the wise protect the root, taking examples from themselves, which requires no distant search.

When inducing sweating, decoctions should be taken warm. Although prescriptions state three doses daily, if the illness does not improve, doses should be administered more frequently, completing three doses within half a day. If symptoms contradict the treatment, observe changes. For severe illnesses, monitor throughout the day and night. If symptoms persist after one dose, administer another dose of the same decoction. Some patients do not sweat until three doses are taken; if no sweat occurs after three doses, it is a fatal condition. After taking Guizhi Tang (Cinnamon Twig Decoction), if profuse sweating occurs with a surging pulse, administer Guizhi Tang again according to previous instructions. If after about half a day restlessness returns with a floating and rapid pulse, sweating may be induced again. (The *Ren Shu* states: If symptoms persist after sweating, two or three sweating treatments may be given within three days, ensuring sweat covers the body below the waist. Note: Precision is crucial here; do not act rashly.) When taking decoctions to induce sweating, stop when the disease is addressed; do not necessarily finish the entire dose. The same applies to vomiting and purging.

Xu Shuaiwei recorded a case of a townsman with Cold Damage, presenting with fever, constipation, irritability, thirst, and mental clouding. The physician used Radix Euphorbiae Pekingensis (Badou) to purge, resulting in loose stools, yet the illness remained unchanged. I observed that Yangming heat binding was internal; only Da Chaihu Tang (Major Bupleurum Decoction) or Chengqi Tang would suffice. Badou only removes accumulation but cannot clear toxic heat. Urgently administering Da Chaihu Tang for three doses resulted in sweating and resolution. I have stated that among Zhang Zhongjing’s 113 formulas, only five are pills: Lizhong Wan, Xiongxiong Wan, Didang Wan, Wumei Wan, and Maren Wan. Lizhong, Xiongxiong, and Didang are made large like bullets and boiled before consumption, similar to decoctions. Maren Wan treats Spleen constraint, and Wumei Wan treats damp-dysentery, using small pills to reach the lower jiao. Other formulas expelling toxins, breaking masses, moving blood stasis, or moistening dryness rely on decoctions. I have never heard of using Badou pills to purge pathogens. If purging fails to resolve the disease, resorting to Rhizoma Pinelliae Preparata (Dahuang) and Natrii Sulfas (Mangxiao) causes further damage.

For any illness, whether treated by sweating, vomiting, purging, or loss of body fluids, if Yin and Yang harmonize spontaneously, the patient will recover. (If fluids are severely depleted, sweating cannot occur, so spontaneous harmony is required.) In Taiyang disease, if after three days of sweating, vomiting, purging, or warm needle therapy the condition remains unresolved, it is termed a "ruined syndrome" (Huai Zheng). Guizhi Tang is no longer applicable. Observe the pulse and symptoms, identify the error, and treat accordingly.

Cheng Wuji stated: For less than three days, sweating suffices; for more than three days, purging suffices. This is a generalization. Patients vary in deficiency and excess, and pathogen transmission speed differs; one cannot rigidly adhere to day counts. Zhang Zhongjing said: Even if many days have passed, if exterior signs exist and the pulse is floating, sweating is appropriate. Even if few days have passed, if interior signs exist and the pulse is deep, purging is appropriate. Treatment must follow the pulse. Furthermore, Six Qi pathogens invade meridians via deficiency. Pathogens entering from the back affect Taiyang or Shaoyin; those from the face affect Yangming, etc., not necessarily starting in Taiyang. Cold pathogens may remain in one meridian or transmit to others; treatment depends solely on pulse and external signs—this is flexibility. For example, if a patient has a floating pulse, stiff neck, headache, fever, and aversion to cold daily, regardless of duration, it is Taiyang meridian involvement. Similar logic applies to other meridians. Generally, Cold Damage diagnosis relies on pulse and external signs for sweating or purging. If many days pass but the pulse remains large, floating, and rapid, though weak upon pressure, the issue remains in Taiyang, and sweating can cure it. If the pulse feels solid upon pressure, sweating leads to death; purging is required. If initially the pulse is deep, fine, and rapid, with external signs like abdominal fullness, dry throat, or dry mouth/tongue indicating heat, the pathology is interior, and purging cures it. Without these signs, if there is exterior heat with a deep pulse, mistaken purging leads to death; instead, use Mahuang Fuzi Gancao Tang (Ephedra, Aconite, and Licorice Decoction) or Mahuang Xixin Fuzi Tang (Ephedra, Asarum, and Aconite Decoction) to mildly induce sweating. These are definitive teachings of Zhang Zhongjing.

Dai Yuanli stated: The crux of Cold Damage lies in distinguishing exterior and interior to determine sweating or purging. Spontaneous sweating or defecation by the patient, or induced by physicians, involves many nuances. Sweating agents should be used early; purgatives late. This is a general principle. However, patients with blood loss or strangury should not be sweated. Such cases require gradual resolution. Forcing sweating in inappropriate cases depletes fluids, causing myriad complications and premature death. One cannot universally apply "sweating early." Conversely, Yangming sweating with abundance requires urgent purging; Shaoyin diarrhea with thirst requires urgent purging; Jueyin tongue curling and testicular retraction require urgent purging. Such cases need rapid purgatives. Failure to purge when indicated allows heat toxicity to deepen, becoming incurable. One cannot universally apply "purging late."

Li Dongyuan stated: Cold Damage treatment prioritizes exterior/interior and urgency/slowness. For Three Yang meridians, exterior treatment is urgent, interior is slow; for Three Yin meridians, exterior is slow, interior is urgent. Floating pulse indicates sweating; deep pulse indicates purging. Floating pulse with urgent sweating and slow purging refers to Three Yang exterior. Deep pulse with urgent purging and slow sweating refers to Three Yin interior. Mahuang Tang is "urgent"; Mahuang Fuzi Xixin Tang is "slow." The *Neijing* states: "Steeping the form induces sweating" refers to slow sweating (interior-exterior connection); "Those on the skin are released by sweating" refers to urgent sweating (exterior-exterior connection). Urgent sweating applies to Taiyang; slow sweating applies to Shaoyin, corresponding to organ meridians. Mahuang Fuzi Xixin Tang treats Shaoyin syndrome with initial fever, deep pulse, interior harmony, and no sweating, thus using steeping for sweating. Mahuang Tang treats Taiyang syndrome with head/neck pain, stiff back, floating pulse, no sweating, and interior harmony, thus releasing pathogens on the skin. The classic says: "Treat the principal slowly, the guest urgently."

Suppose the Liver pulse is obtained: external signs include fair complexion, blueish hue, anger; all three positions show string-taut and floating pulses; aversion to cold; interior harmony; normal urination and defecation. Add Qianghuo (Notopterygium Rhizome) and Fangfeng (Saposhnikovia Root) 3 qian each to Mahuang Tang. Liver governs wind; this is Gallbladder meridian involvement. Constipation or profuse red watery stool indicates interior disharmony. Suppose the Heart pulse is obtained: external signs include red face, dry mouth, laughter; Chi and Cun positions show floating and surging pulses; aversion to cold; interior harmony; normal excretions. Add Huangqin (Scutellaria Root) and Shigao (Gypsum Fibrosum) 3 qian each to Mahuang Tang. Heart governs heat; this is Small Intestine meridian involvement. Suppose the Spleen pulse is obtained: external signs include yellow face, belching, overthinking, taste preference; Chi and Cun positions show floating and moderate pulses; interior harmony; aversion to cold. Add Baizhu (Atractylodes Macrocephala Rhizome) and Fangfeng 3 qian each to Mahuang Tang. Spleen governs dampness; this is Stomach meridian involvement. Suppose the Lung pulse is obtained: external signs include pale face, sneezing, sorrow, weeping; Chi and Cun positions show floating and choppy pulses; interior harmony; aversion to cold. Add Guizhi (Cinnamon Twig) and Shengjiang (Zingiberis Rhizoma Recens) 3 qian each to Mahuang Tang. Lung governs dryness; this is Large Intestine meridian involvement. Suppose the Kidney pulse is obtained: external signs include black face, fear, yawning; Chi and Cun positions show deep pulses; interior harmony; aversion to cold. Add Fuzi (Aconiti Lateralis Radix Praeparata) and Shengjiang 3 qian each to Mahuang Tang. Kidney governs cold; this is Bladder meridian involvement.

These five syndromes are "exterior of the exterior," meaning pathogens are on the skin, requiring urgent sweating; all involve Fu organs. "Interior of the exterior" requires slow purging. This occurs when exterior signs of a Zang organ appear (floating Chi/Cun pulses) accompanied by interior signs: fever, thirst, dark urine, or red watery stool; pulse floating but solid upon pressure, or painful. Remove Mahuang and Xingren from Mahuang Tang, add original Zang-specific herbs, decoct together, divide into five doses. For each syndrome, start with 5 fen Dahuang (Rhei Radix et Rhizoma); if pathogens remain, add 1 qian; if still remaining, add 1.5 qian. Stop when pathogens are cleared. This is "slow then urgent," suitable for purging the interior of the exterior.

Suppose the Liver pulse is obtained: internal signs include chest oppression, dribbling dysuria, difficult defecation, tendon contraction; Chi and Cun positions show deep and string-taut pulses; interior harmony; aversion to cold. Liver meridian involvement. Add Qianghuo and Fangfeng 3 qian each to Mahuang Fuzi Xixin Tang. Suppose the Heart pulse is obtained: internal signs include vexation, heart pain, hot palms, hiccups; Chi and Cun positions show deep and surging pulses; interior harmony; aversion to cold. Heart meridian involvement. Add Huangqin and Shigao 3 qian each to the aforementioned decoction. Suppose the Spleen pulse is obtained: internal signs include abdominal fullness, indigestion, lethargy, desire to lie down; Chi and Cun positions show deep and moderate pulses; interior harmony; aversion to cold. (Note: Text likely implies Spleen, though written as Lung) Add Baizhu and Fangji (Stephaniae Tetrandrae Radix) 3 qian each. Suppose the Lung pulse is obtained: internal signs include cough, asthma, chills and fever; Chi and Cun positions show deep and choppy pulses; interior harmony; aversion to cold. Lung meridian involvement. Add Shengjiang and Guizhi 3 qian each. Suppose the Kidney pulse is obtained: internal signs include diarrhea, tenesmus, cold legs; Chi and Cun positions show deep pulses; interior harmony; aversion to cold. Kidney meridian involvement. Add Jiang (Ginger) and Fuzi 3 qian each.

These five syndromes are "interior of the exterior," requiring steaming/sweating; all involve Zang organs. "Interior of the interior" requires urgent purging. This occurs when internal Zang signs appear (deep Chi/Cun pulses) accompanied by interior signs: dark copious urine, constipation, red watery stool, diarrhea, cough, inability to eat/drink, aversion to neither wind nor cold, fever, thirst. Pulse is deep and solid/painful upon pressure, indicating interior excess requiring rapid purging. Remove Mahuang from Mahuang Fuzi Xixin Tang, add original Zang-specific herbs, decoct together, divide into three doses. For each syndrome, start with 3 qian Dahuang; stop when pathogens clear. If remaining, second dose adds 2 qian; if still remaining, third dose adds 1 qian. This is "urgent then slow," suitable for rapidly purging the interior of the interior.