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Originally, sweating therapy should have been applied, but purgation was used instead. This is an incorrect treatment. If sweating therapy had been applied first, the treatment would not have been incorrect. Originally, purgation should have been applied, but sweating therapy was used instead. This is also an incorrect treatment. If purgation had been applied first, the treatment would not have been incorrect.

This generally refers to the methods of sweating and purging, each having its appropriate indications. Treatment should be administered according to the disease condition, without losing proper measure. For instance, if there are headache, fever, and aversion to cold, sweating therapy should originally be used; using purgation instead means treating the interior when the disease is in the exterior, hence it is called incorrect. If there is abdominal fullness, constipation, and aversion to heat, purgation should originally be used; using sweating therapy instead means treating the exterior when the disease is in the interior, hence it is also called incorrect. If one carefully determines that sweating is indicated and applies it, or that purgation is indicated and applies it, then what error could there be? The *Waitai Miyao* states: When the exterior pathogen remains while the interior is harmonious, sweating leads to cure while purgation leads to death; when the interior pathogen remains while the exterior is harmonious, purgation leads to cure while sweating leads to death. One must be cautious.

In Taiyang disease (disease of the Taiyang channel), if sweating is applied first but the disease does not resolve, and purgation is subsequently applied, yet the pulse remains floating, the disease will not resolve. A floating pulse indicates the pathogen is still in the exterior. Using purgation in this case causes the disease to persist. Since the pulse is currently floating, we know the pathogen remains in the exterior. To achieve cure, the exterior must be resolved. Guizhi Tang (Cinnamon Twig Decoction) is indicated.

After both sweating and purging, if the pathogen does not disperse from the exterior nor exit from the interior, it is because the pulse is floating and the pathogen remains in the exterior. Thus, even after purgation, the disease does not resolve. Diseases located in the exterior require guidance out through the exterior. Although sweating and purging have already been performed, the persistent floating pulse indicates the pathogen remains in the exterior. Therefore, Guizhi Tang is needed to dissipate the exterior pathogen for recovery. The Shaoyang chapter states: If Chaihujia Huangqin Tang (Bupleurum and Scutellaria Decoction) syndrome is present but treated with other purgatives, and the Chaihu syndrome persists, administering Chaihu Tang again will cause shivering followed by fever and sweating, leading to resolution. This aligns with the current principle and should be cross-referenced.

In Taiyang disease, if purgation is applied first without resolution, followed by sweating, this renders both the exterior and interior deficient. Consequently, the patient experiences Mao (head heaviness/vertigo). In cases of Mao, spontaneous sweating leads to recovery. This is because sweating harmonizes the exterior. If the interior remains unharmonized, purgation may be applied subsequently.

Purgation injures the interior, and sweating injures the exterior. Both procedures render the exterior and interior deficient while the pathogen remains unresolved, leading to Mao. Mao refers to head heaviness or vertigo. Due to pathogenic obstruction at the exterior and depression of Yang Qi, which desires to emerge but cannot, the patient experiences intermittent vertigo as if obscured by a covering. If sweating occurs, the pathogen disperses, Yang Qi emerges, and Mao resolves spontaneously. The *Jingui Yaolue* states: Recovery from Mao requires profuse sweating. However, this occurs only after Zheng Qi (Upright Qi) recovers; it should not be forced pharmacologically. If Mao resolves after sweating but the interior remains unharmonized, purgation may then be applied to harmonize the interior. This illustrates the principle: "When the interior is diseased but the exterior is harmonious, purgation leads to cure."

Following severe purgation and subsequent sweating, if urination is difficult, it is due to the depletion of Body Fluids (Jin Ye). Do not treat it directly; wait for urination to normalize, and the disease will self-resolve.

Both purgation and sweating severely deplete Body Fluids. Although major pathogens are resolved, difficulty in urination indicates that diuretics should not be used prematurely. Once Body Fluids gradually recover, urination will normalize naturally. Forced diuresis would further exhaust Yin fluids and may not even succeed.

After purgation and subsequent sweating, chills and tremors occur with a faint and thin pulse. This results from deficiency in both the interior and exterior.

Chills and tremors indicate shaking accompanied by cold. A faint pulse signifies Yang Qi deficiency, while a thin pulse indicates Yin Qi insufficiency. Following both purgation and sweating, chills, tremors, and a faint-thin pulse signify injury to both Yin and Yang, resulting in general deficiency. Sweet-warm herbs should be used to harmonize and nourish.

After purgation and subsequent sweating, if the patient experiences restlessness during the day but calmness at night, without vomiting, thirst, or exterior signs, and presents with a deep, faint pulse and no significant fever, Ganjiang Fuzi Tang (Dried Ginger and Aconite Decoction) is indicated.

Generally, symptoms quiet during the day and worsen at night indicate Kidney Yin pathology; symptoms quiet at night and worsen during the day indicate Stomach Yang pathology. After sweating and purging, daytime restlessness with nighttime calmness suggests residual pathogen and depleted Yang Qi. During the day, Yang Qi attempts to recover and struggles with the pathogen, causing restlessness. At night, Yin is dominant and Yang is weak, unable to struggle with the pathogen, resulting in calmness. Absence of vomiting and thirst indicates no interior heat. Lack of significant fever indicates no exterior heat. Without headache or aversion to cold, and with a deep, faint pulse rather than floating or surging, Yang Qi depletion is certain. Ganjiang and Fuzi should be administered to support Yang Qi and dispel residual Yin-cold. These three clauses illustrate post-sweating/purging variations: difficulty in urination indicates Yin injury; chills with faint-thin pulse indicate dual Yin-Yang injury; daytime restlessness with nighttime calmness indicates Yang injury without Yin involvement.

Ganjiang Fuzi Tang Formula
Ganjiang (Dried Ginger, 1 liang) Fuzi (Aconite Root, raw, peeled, cut into 8 slices, 1 piece)
These two ingredients are boiled in 3 sheng of water to obtain 1 sheng. Strain and administer in one dose.

If the disease persists with irritability after sweating or purging, Fuling Sini Tang (Poria and Four-Reverse Decoction) is indicated.

Sweating or purging fails to eliminate pathogens completely and damages Zheng Qi. Zheng Qi attempts to recover but cannot, while residual pathogens linger. The struggle between Zheng Qi and pathogens generates irritability. At this stage, Mahuang and Guizhi should not be used to expel pathogens, nor Zhizi and Chishao to suppress irritability. In this formula, the acridity of Ganjiang and Sheng Fuzi disperses pathogens, while the sweetness of Fuling, Renshen, and Gancao nourishes Zheng Qi. This is a method of strengthening the host to overcome the guest.

Fuling Sini Tang Formula
Fuling (Poria, 6 liang) Renshen (Ginseng Root, 1 liang) Ganjiang (Dried Ginger, 1.5 liang) Gancao (Licorice Root, honey-fried, 2 liang) Fuzi (Aconite Root, raw, peeled, broken into 8 pieces, 1 piece)
These five ingredients are boiled in 5 sheng of water to obtain 3 sheng. Strain, warm, and administer 7 ge per dose, three times daily.

Note: Irritability following sweating and purging is caused by Zheng Qi deficiency and pathogenic disturbance, varying between excess pathogen with slight deficiency, or slight pathogen with marked deficiency. When pathogens are excessive, expelling them stabilizes Zheng Qi; when deficiency is predominant, supporting Zheng Qi expels pathogens. Zhang Zhongjing provided Zhizi Chi Tang (Gardenia and Fermented Soybean Decoction) for excess cases and Fuling Sini Tang for deficiency cases, demonstrating comprehensive management of excess and deficiency. Scholars should study this thoroughly.

In Shanghan (Cold Damage) with heat in the chest and pathogenic qi in the stomach, presenting with abdominal pain and desire to vomit, Huanglian Tang (Coptis Decoction) is indicated.

This involves all three Jiao (Upper, Middle, Lower Burners), with the root in the Stomach. The pathogen is cold-dampness. The Stomach houses Chong Qi, facilitating ascending and descending functions. Pathogenic invasion disrupts Stomach harmony, halting the mechanism of ascent and descent and blocking upper-lower pathways. As Cheng Wuji stated: Yin Qi failing to ascend dominates the lower, causing lower cold and abdominal pain; Yang Qi failing to descend dominates the upper, causing chest heat and nausea. Huanglian's bitter-cold clears upper heat; Guizhi's sweet-warm dispels lower cold. Once upper and lower are balanced, ascent and descent resume. However, without regulating the Middle Jiao, ascent and descent remain impaired. Therefore, Renshen, Banxia, Ganjiang, Gancao, and Dazao are used to boost Stomach Qi and eliminate pathogens. This belongs to Pi Syndrome (epigastric fullness/obstruction), often arising after damage from cold herbs. Though not explicitly stated, it is evident as a post-mistreatment condition. Its composition resembles Xiexin Tang formulas but includes Guizhi.

Huanglian Tang Formula
Huanglian (Coptis Rhizome) Guizhi (Cinnamon Twig, peeled) Ganjiang (Dried Ginger) Gancao (Licorice Root, honey-fried, 3 liang each) Renshen (Ginseng Root, 2 liang) Banxia (Pinellia Tuber, half sheng, washed) Dazao (Jujube Fruit, 12 pieces, split)
These seven ingredients are boiled in 1 dou of water to obtain 6 sheng. Strain, warm, and administer 1 sheng per dose, three times daily and twice at night.

Taiyang disease typically presents with aversion to cold and fever. Currently, however, there is spontaneous sweating, no aversion to cold or fever, and a fine, rapid pulse at the Guan position. This results from the physician inducing vomiting. If vomiting was induced on days 1-2, the patient feels hungry in the abdomen but cannot eat. If induced on days 3-4, the patient dislikes congee and craves cold food, vomiting what was eaten in the morning by evening. This is caused by the physician's vomiting and is termed a Minor Error.

Inducing vomiting in an exterior disease removes pathogens but damages Stomach Qi, causing spontaneous sweating, absence of cold/fever, and a fine-rapid pulse. On days 1-2, Stomach Qi is initially harmonious; vomiting empties the Stomach, causing hunger. However, upward reversal of Stomach Qi prevents eating. By days 3-4, Stomach heat generates; vomiting exacerbates upward heat, causing dislike of congee and craving for cold food. Deficient Stomach Qi fails to digest grain, leading to morning intake and evening vomiting. This is not natural disease progression but iatrogenic. It is called a Minor Error because pathogens are gone but Stomach Qi is unharmonized; harmonizing the Stomach ensures recovery.

Following vomiting and purging in Shanghan, then sweating, virtual irritability and a very faint pulse occur. By day 8-9, epigastric hardness, hypochondriac pain, Qi rushing to the throat, vertigo, and twitching of meridians appear. Prolonged, this becomes Wei Syndrome (flaccidity syndrome). Repeated vomiting, purging, and sweating layer upon layer deplete Body Fluids, allowing pathogens to sink, causing virtual irritability. Virtual irritability arises from insufficient Zheng Qi disturbed by pathogens, leading to mental unrest. By day 8-9, Zheng Qi recovery should bring cure. Instead, epigastric hardness, hypochondriac pain, Qi rushing to the throat, and vertigo indicate pathogenic fluid accumulation and upward rebellion. Accumulated fluid cannot circulate; rebellious Qi cannot descend. Meridians rely on Blood. After sweating, vomiting, and purging, little Blood remains. Pathogens bind into fluid, preventing meridian distribution, like fish out of water trembling. Meridians sustain the body. Lacking prior immersion and future nourishment, tendons become dry and contracted, or joints break and legs relax, unable to bear weight, resembling Mai Wei and Jin Wei syndromes described in the *Neijing*. Hence, prolonged cases develop Wei Syndrome.

In Taiyang disease, vomiting induces internal irritation. Taiyang disease typically involves aversion to cold; now, aversion is absent, and the patient dislikes clothing. This results from vomiting causing internal heat.

Vomiting in an exterior disease removes pathogens but generates Stomach heat, causing internal irritation. Internal irritation is heat arising internally, generating vexation.

In Taiyang disease, after passing the initial stage for over ten days, if there is epigastric discomfort with desire to vomit, chest pain, loose stools, mild abdominal fullness, and mild vexation, and the patient previously underwent extreme vomiting and purging, Tiaowei Chengqi Tang (Harmonizing the Stomach and Directing Downward Decoction) is indicated. Otherwise, do not use it. If there is merely desire to vomit, chest pain, and loose stools, this is not Chaihu Syndrome, as vomiting indicates prior extreme vomiting/purging.

"Passing the stage" means the disease has moved beyond the Taiyang channel (see Yangming chapter). Epigastric discomfort and chest pain result from Qi reversing upward due to vomiting, unable to descend. This differs from normal nausea. Loose stools result from Qi sinking downward due to purging, unable to ascend. This differs from chronic loose stools. If abdominal fullness and vexation are present, indicating significant heat accumulation in the middle, Tiaowei Chengqi Tang is necessary to clear pathogens. Clearing pathogens resolves abdominal fullness/vexation and chest pain/nausea. This utilizes the momentum of the disease. If not caused by vomiting/purging, nausea and loose stools contraindicate purgation; Tiaowei Chengqi Tang should not be given indiscriminately. Mere nausea and chest pain resembling Chaihu Syndrome, occurring after extreme vomiting/purging, indicate Middle Qi pathology, not treatable by Chaihu formulas. The indication for extreme vomiting/purging is loose stools combined with persistent vomiting. Otherwise, if pathology were solely lower, it would not rebound upward.

In Taiyang disease, after three days of sweating, if vomiting, purging, or warm needle therapy fails to resolve the condition, it is termed Huai Bing (Complicated Disease). Guizhi Tang is no longer applicable. Observe the pulse and symptoms, identify the error, and treat according to the presentation.

"If" here implies "or": whether sweating, vomiting, purging, or warm needles were used, persistence of disease constitutes Huai Bing. Huai Bing refers to disease altered by medical intervention, where signs and pulses no longer match the original state, rendering original treatments ineffective. Thus, Guizhi Tang is unsuitable. One must examine pulse and symptoms, identify the specific error, and apply treatment accordingly.