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The *Huangdi Neijing* (Yellow Emperor's Inner Canon) treats Shanghan (Cold Damage) with only two methods: sweating (Diaphoresis) and purging (Purgation). It states: If the pathogen has not yet entered the Fu organs, it can be resolved by sweating; if the pathogen has already entered the Fu organs, it can be resolved by purging. It also says: To release the exterior, one need not avoid hot-natured herbs; to attack the interior, one need not avoid cold-natured herbs. How direct and simple are these treatment methods. I hold that releasing the exterior is not limited to just the sweating method. Any method that induces the eruption of rashes, macules, pustules, or smallpox, thereby expelling the pathogen from the surface, is called releasing the exterior. Attacking the interior is not limited to just the purging method. Any method that guides out phlegm, eliminates fluid retention, resolves food stagnation, removes accumulation, invigorates blood circulation to remove stasis, kills parasites, promotes urination, or drives out seminal debris, thereby expelling the pathogen from the interior, is called attacking the interior.

[Xiu's Note] This statement is extremely clear and thorough. Any pathogen coming from outside must go out from outside. Releasing the exterior is indeed an external resolution, and attacking the interior is also a form of external resolution (expulsion via body openings). In short, it is merely about providing an exit for the pathogen, ensuring the pathogen has an exit as early as possible. Even in cases of deficiency-excess complex, one merely assists with methods to support the expulsion of pathogens and formulas to protect healthy qi, but ultimately the focus remains on eliminating the pathogen. The earlier the pathogen retreats, the earlier healthy qi recovers. This is the general principle for treating all exogenous diseases.

When the pathogen is removed, healthy qi becomes secure; therefore, expelling pathogens prioritizes releasing the exterior and attacking the interior. When healthy qi is sufficient, pathogens naturally depart; therefore, supporting healthy qi prioritizes nourishing yin and tonifying yang. The ancients, in removing disease and tonifying deficiency, always relied on these four major essential methods: releasing the exterior, attacking the interior, nourishing yin, and tonifying yang.

[Xiu's Note] In treating Shanghan, one must first eliminate the disease. Once the disease is gone, even deficiency conditions can generate vitality; if the disease remains, even excess conditions will lead to death. Regardless of whether the pathogen is wind-cold, summerheat-dampness, warm-heat, or pestilential toxin, the merit lies in expelling the pathogen. If sweating is indicated, sweat it; if purging is indicated, purge it. There is no need to debate the similarities or differences of the pathogens. Only in cases of "Four Damages" (Si Sun) and "Four Deficiencies" (Si Bu Zu), such as after excessive labor, excessive sexual desire, or severe/prolonged illness, where both qi and blood are deficient and yin and yang are depleted, is this called "Four Damages." If one contracts seasonal pathogens while healthy qi is already deficient, the pathogen naturally sinks inward; this is called internal injury complicated by external contraction. For such cases, one cannot use standard orthodox treatments but must regulate according to the damage. For lung damage, benefit its qi; for heart damage, harmonize Ying and Wei (Nutritive and Defensive Qi); for spleen damage, regulate diet and adapt to cold and warmth; for liver damage, soothe its middle jiao; for kidney damage, benefit its essence. If regulation does not cure, apply standard treatments slightly. For First and Second Damages, mild cases may be reversible; severe cases are beyond treatment. For Third and Fourth Damages, the source of transformation is exhausted, and only a withered soul remains; even masters like Lu and Bian would have no skill to apply. As for the "Four Deficiencies": (1) Qi deficiency, such as insufficient breath to breathe, insufficient voice to hear, or wanting to speak but unable to do so; despite heavy pathogenic infection, there are no symptoms of distension, fullness, or obstruction. (2) Blood deficiency, such as sallow complexion, pale lips and mouth, or due to hematemesis, epistaxis, metrorrhagia, excessive blood loss postpartum, or caused by intestinal wind or visceral toxins; despite heavy pathogenic infection, the face and eyes lack yang heat color. (3) Yin deficiency, such as dryness of the five fluids, rough skin resembling armor scales; despite heavy pathogenic infection, sweating should occur but does not. (4) Yang deficiency, such as cold extremities, diarrhea with undigested food, aversion to cold in the body, frequent diarrhea worsening at night, or cold air from mouth and nose; despite heavy pathogenic infection, there are no symptoms of fever, dryness-thirst, or prickly tongue coating. This is called deficiency mixed with excess. For such cases, urgent and potent tonification is appropriate. After the deficiency is restored, if the pathogenic infection is not fully cleared, treat it slightly according to exogenous disease methods. However, one must distinguish whether deficiency is greater than excess or vice versa, or whether the branch (symptom) or root (cause) is urgent, carefully examining current symptoms, pulse, and tongue. If deficiency is greater than excess and the root is urgent, first tonify deficiency to protect the root; if excess is greater than deficiency and the branch is urgent, first remove excess to treat the branch. If deficiency symptoms persist after tonification, or if complications arise, the condition is critical. If healthy qi departs with the pathogen after elimination, leading to collapse symptoms, the prognosis is fatal.

[Lian's Verification] In general exogenous diseases, those complicated by spleen deficiency are difficult to treat, and those complicated by kidney deficiency are especially difficult. Generally, exogenous pathogens are resolved externally through sweating, purging, clearing, and draining. If complicated by spleen deficiency, spleen yang deficiency prevents sweating from the exterior, and spleen yin deficiency prevents tolerance of purgation from the interior. If sweating occurs, yang qi escapes with the sweat; if purgation occurs, yin qi escapes from below. Even using purely clearing and draining methods, the Middle Qi cannot support it; the cooler the medicine, the more the pathogen is constrained, spleen qi fails to ascend, often resulting in abdominal fullness, loose stools, weak qi, and mental fatigue, eventually dying from spontaneous sweating and qi collapse. Regarding kidney deficiency complications, there are yin and yang distinctions. In yang deficiency, upon sweating, purging, clearing, or draining, collapse symptoms appear immediately. In yin deficiency, upon sweating, purging, or warming dispersion, exhaustion symptoms appear immediately. Often, the pathogen is not yet removed, but healthy qi has already collapsed. At this critical juncture of deficiency and excess, constant diagnosis is required.