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When the pathogen of Cold Damage (Shanghan) is in the exterior, sweating method can be used; when it is in the interior, purgation method can be used; when it is between the exterior and interior, there is only one method: harmonization. Zhang Zhongjing used Xiao Chai Hu Tang (Minor Bupleurum Decoction) with modifications as this approach. However, there are cases where harmonization should have been applied but was not, leading to harm; and cases where harmonization was inappropriate yet applied, also causing harm. Furthermore, even when harmonization is indicated and applied, harm may result from failing to discern the proportion of cold versus heat pathogens, the deficiency or excess of the patient's constitution, the dryness or dampness of the zang-fu organs, and whether the pathogen is combined with other factors. These distinctions must not be overlooked.

When a patient presents with deafness, hypochondriac pain, and alternating chills and fever, indicating the Shaoyang stage, Chai Hu Tang (Bupleurum Decoction) should be used for harmonization. If instead Ma Huang Tang (Ephedra Decoction) or Gui Zhi Tang (Cinnamon Twig Decoction) are used to release the exterior, it is an error. Using Da Huang (Rhubarb Root and Rhizome) and Mang Xiao (Mirabilite) to purge the interior is an even greater error. Alternatively, using emesis due to chest fullness and hypochondriac pain is also incorrect. Generally, when the disease is in the Shaoyang Gallbladder channel, three methods are contraindicated: sweating, vomiting, and purging. Moreover, not only are these three methods forbidden, but arbitrarily using other drugs besides them is equally unbeneficial and harmful. The ancients stated that the Shaoyang Gallbladder is a "pure and clear" organ without direct pathways in or out, admitting only the method of harmonization. The formula containing Chai Hu (Bupleuri Radix) is most appropriate. Their insight was so clear, and their formulation of treatment principles so subtle, reaching such precision! This is what is meant by "harmonizing when harmonization is indicated."

However, there are cases where harmonization is inappropriate. For instance, if the pathogen is still in the exterior and has not entered the Shaoyang, mistakenly using Chai Hu Tang is called "leading the thief into the house." Mildly, it may transform into malaria (Nue); severely, the pathogen may enter the Pericardium (Xin Bao), gradually evolving into symptoms of coma and muteness. In cases where the pathogen has already entered the interior, presenting with clustered symptoms such as dry mouth, thirst, and delirious speech, treating solely with Chai Hu Tang will fail to resolve the disease. Regarding internal injuries caused by fatigue or improper diet, Qi deficiency, Blood deficiency, carbuncles, and blood stasis, all of which may present with alternating chills and fever resembling malaria but not being true malaria, these cannot be cured by Chai Hu Tang. If the syndrome is not clearly differentiated and medication is not precisely prescribed, but rather this mild method is borrowed to conceal incompetence, the harm done to patients is profound. This is what is meant by "harmonizing when harmonization is not indicated."

Yet there are cases where harmonization is indicated and applied, but the practitioner fails to discern the proportion of cold versus heat. Why? In Cold Damage, pathogens in the exterior manifest as cold, while those in the interior manifest as heat. Between the exterior and interior lies the junction of cold and heat. If the pathogen leans toward the exterior, cold predominates; if it leans toward the interior, heat predominates. Medication must correspond to this balance so that Yin and Yang achieve harmony and the pathogen is swiftly resolved. Otherwise, adding cold to a cold-dominant condition, or heat to a heat-dominant condition, results in unbalanced medication and aggravated illness. This is not a failure of harmonization per se, but a failure to apply harmonization correctly regarding the proportions of cold and heat.

There are also cases where harmonization is indicated and applied, but the practitioner ignores the deficiency or excess of the patient's constitution. When an external pathogen is in the exterior, it is like a thief who has just entered the gate; how would he dare to ascend to the hall and enter the bedroom? He must first observe that the hall is empty/weak before taking advantage of the gap to advance. Therefore, Ren Shen (Ginseng Radix et Rhizoma) is included in Xiao Chai Hu Tang to tonify righteous Qi. When righteous Qi is robust, the pathogen has no place to reside, and resolution naturally occurs through sweating. The pathogen enters through this door and exits through the same door. In cases where exterior pathogens were not released via sweating, causing the pores to become tight and the pathogen to have no exit, it may transmit to the Shaoyang, where heat gradually intensifies. This situation is unrelated to constitutional deficiency; thus, there are cases where healing occurs through harmonization alone without using Ren Shen. This demonstrates that diseases vary in deficiency and excess, and treatment methods must be flexible; errors must be avoided.

There are also cases where harmonization is indicated and applied, but the practitioner fails to discern the dryness or dampness of the zang-fu organs. For example, if the disease is in the Shaoyang, but the mouth is not dry and bowel movements are normal, this indicates that body fluids have not been damaged. Moistening and cooling herbs should not be overused; Ban Xia (Pinelliae Rhizoma) and Sheng Jiang (Zingiberis Rhizoma Recens) can both be used. If there is severe dry mouth and gradual constipation, this suggests the pathogen is about to enter the Yin level and body fluids are diminishing. In this case, acrid-warming herbs should be removed, and Hua Fen (Trichosanthis Radix) and Gua Lou (Trichosanthis Fructus) become necessary. This illustrates the difference in dryness and dampness among the zang-fu organs.

There are also cases where harmonization is indicated and applied, but the practitioner fails to recognize combined pathogens. Suppose the pathogen is in the Shaoyang, but Taiyang and Yangming syndromes have not yet resolved; this is Shaoyang combined with exterior pathogen. Exterior-releasing herbs must be added to Xiao Chai Hu Tang; Zhang Zhongjing provided the example of Chai Hu Jia Gui Zhi Tang (Minor Bupleurum Decoction plus Cinnamon Twig). Again, if the pathogen is in the Shaoyang and combined with interior heat, symptoms such as constipation, delirium, and dry thirst arise. Interior-purging herbs must be added to Xiao Chai Hu Tang; Zhang Zhongjing provided the example of Chai Hu Jia Mang Xiao Tang (Minor Bupleurum Decoction plus Mirabilite). Additionally, in Triple Yang combination disease, characterized by sweating with eyes closed, greasy facial appearance, delirium, and urinary incontinence, Bai Hu Tang (White Tiger Decoction) is used for harmonization. Since Triple Yang diseases inevitably involve the Stomach Fu organ, acrid-cooling herbs are used to clear the interior Fu organ and vent the exterior skin, allowing the pathogens of the three channels to dissipate together. This represents using a clearing agent specifically for harmonization. This illustrates the concept of combined pathogens.

From this deduction, we see harmonization achieved through clearing, warming, resolving stagnation, tonifying, drying, moistening, combining with exterior release, and combining with purgation. The principle of harmonization is singular, but its methods are infinite. Those who understand this principle can extend it to the treatment of Warm Diseases (Wen Bing), formulas for Epidemic Toxins (Wen Yi), and seasonal malaria, achieving cures with ease. People casually speak of "harmonization" but fail to exhaust its methods. Such ignorance leads to increasing Qi while aiding the pathogen, exacerbating conflict, and solidifying the disease. Can such actions truly be called harmonization?