问曰。太阳误汗。其变有别否。答曰。最危者误发少阴汗。仲景于大青龙汤证。必辨无
少阴
证相杂者。方可大发其汗。盖太阳与少阴相表里。少阴病亦有发热身重之证。然脉微细。但
欲寐。便与太阳病不同。若误认为太阳病。而大发其汗。则肾中真气。与汗俱泄。以致筋惕
肉。真阳之亡。可立而待。又有太阳病本宜汗解。或其人阳气素虚。不相其人之津液。妄
予大发其汗。亦足召亡阳之变。更有发汗后。卫阳已虚。外风又袭。此属漏风。其人恶风
。小便难。四肢微急。难已屈伸。其证与亡阳微有别。皆当以回阳为急者也。若发汗之后。
津液被劫。真阴受戕。其人大渴引饮。不大便。甚则谵语口干咽烂。手足躁扰。甚则热深厥
逆。此真阴将涸之候。但看阴液尚有一线未亡。可施灌溉之力。若阴已涸者。救亦无及。要
之阳亡之候。其死速。急回其阳而取效转易。阴亡之候。其死迟。急顾其阴而取效反难。果
当太阳病初起时治之如法。何遽至此哉。乃知今人妄称伤寒。不察其人之病因。罔顾其人之
津液。谓病在太阳。概从汗散者。诚操刃之事也。
问曰。误下若何。答曰。太阳病误下后。若作协热利者。法当挽下陷之邪。仍从太阳之
表而
解。若中土陷者。以理中为急。若下元惫者。以固下为急。若下利清谷不止者。急温其里。
非四逆汤不救。此皆真阳将随下利而亡。挽回阳气。不容稍稽时日。若热邪在表。因误下之
故。致表邪陷入。搏聚于心胸。因有为痞为结之变。仲景云。病发于阳而反下之。热入因作
结
胸。病发于阴而反下之。因作痞。治心下痞。仲景有诸泻心法。治结胸。仲景有大小陷胸法
。各因其势之轻重缓急。分别救疗。其法丝丝入扣。不容分毫假借。宜熟玩也。今人于太阳
病
下法。亦不敢轻试。然但屏去硝黄。以为慎下。至一切香燥导气之品。最耗散正气者。反恣
行无忌。致酿成种种变逆。我见甚多矣。夫岂必待用硝黄而后为妄下哉。
问：太阳病误用发汗法，其变证是否有区别？
答：最危险的是误发少阴病的汗。张仲景在大青龙汤的适应证中，必须辨别没有少阴病的证候夹杂其中，才可以大发其汗。因为太阳与少阴互为表里，少阴病也有发热、身体沉重的症状。然而，少阴病的脉象微细，且只想睡觉（但欲寐），这与太阳病不同。如果误认为是太阳病而大发其汗，那么肾中的真气就会随着汗液一起泄出，导致筋惕肉瞤（肌肉跳动），真阳的亡失，顷刻间即可发生。又有太阳病本来适宜用汗法解表，但如果患者阳气素来虚弱，不观察患者的津液状况，妄自给予大发其汗，也足以招致亡阳的变证。更有发汗之后，卫阳已经虚弱，外风再次侵袭，这属于漏风证。患者恶风，小便困难，四肢轻微拘急，难以屈伸。这种证候与亡阳证略有不同，但都应当以回阳救逆为紧急措施。如果在发汗之后，津液被劫夺，真阴受到损伤，患者大渴引饮，不大便，甚至出现谵语、口干、咽喉腐烂，手足躁扰不安，甚至热深厥逆（内热极盛而四肢厥冷），这是真阴即将枯竭的征候。只要看阴液尚存一线未亡，还可以施以滋阴灌溉之力；如果阴液已经枯竭，即使救治也无济于事了。总之，亡阳的证候，死亡迅速，急切回阳则容易见效；亡阴的证候，死亡较缓，急切顾护阴液反而难见效效。果真在太阳病初起时治疗得法，怎么会到了这一步呢？由此可知，现在的人妄称伤寒，不考察患者的病因，不顾及患者的津液，认为病在太阳，一概从汗法发散，这确实是拿着刀乱砍一样的危险行为啊。
问：误用下法会怎样？
答：太阳病误用下法后，如果表现为协热利（表邪入里化热导致的腹泻），治法应当挽回下陷之邪气，仍从太阳之表而解。如果是中焦脾胃之气下陷，则以理中汤为急务。如果是下元（肾阳）疲惫衰竭，则以固涩下焦为急务。如果下利清谷（排出未消化的食物）不止，必须紧急温补里寒，非用四逆汤不能挽救。这些都是真阳将随着下利而亡失，挽回阳气，不容许稍有延误。如果热邪在表，因为误用下法的原因，导致表邪陷入，搏结聚集在心胸部位，从而产生痞证或结胸证的变证。张仲景说：“病发于阳而反下之，热入因作结胸；病发于阴而反下之，因作痞。”治疗心下痞，张仲景有各种泻心汤的方法；治疗结胸，张仲景有大、小陷胸汤的方法。各根据其势的轻重缓急，分别进行救治。这些方法丝丝入扣，不容许丝毫差错，应当仔细研读玩味。现在的人对于太阳病的下法，也不敢轻易尝试。然而只是摒弃硝石、大黄等峻下药，以为就是谨慎使用下法，至于一切香燥行气的药物，最耗散正气的，反而肆意横行无忌，导致酿成种种变逆之证，我见到的太多了。这难道是一定要用硝石、大黄才算是妄用下法吗？
Question: Regarding the misapplication of sweating methods in Taiyang disease, are there differences in the resulting transformational syndromes?
Answer: The most critical danger lies in mistakenly inducing sweat for Shaoyin disease. Zhang Zhongjing, when prescribing Da Qing Long Tang (Great Blue Dragon Decoction), strictly requires distinguishing that no Shaoyin syndrome patterns are mixed in before allowing for vigorous sweating. This is because Taiyang and Shaoyin are exterior-interior paired meridians. Shaoyin disease may also present with fever and heaviness of the body. However, the pulse is faint and fine (Wei Xi), and the patient exhibits a desire only to sleep (Dan Yu Mei), which differs from Taiyang disease. If mistakenly identified as Taiyang disease and vigorously sweated, the True Qi within the Kidney will be lost along with the sweat, leading to muscle twitching and tremors (Jin Ti Rou Yue). The loss of True Yang can occur instantaneously. Furthermore, while Taiyang disease is originally suitable for resolution via sweating, if the patient has inherent Yang deficiency, and one fails to assess the patient's fluid status, recklessly inducing vigorous sweating is sufficient to invite the transformation of Yang collapse. Additionally, after sweating, if Wei Yang (Defensive Yang) is already deficient and external wind attacks again, this belongs to "Lou Feng" (Leaking Wind). The patient experiences aversion to wind, difficulty in urination, slight stiffness in the four limbs making flexion and extension difficult. This syndrome differs slightly from Yang collapse, yet both require urgent restoration of Yang. If, after sweating, fluids are depleted and True Yin is damaged, the patient experiences extreme thirst with excessive drinking, constipation, and even delirium, dry mouth, rotting throat, restlessness of hands and feet, or even deep heat with cold extremities (Re Shen Jue Ni). These are signs that True Yin is about to be exhausted. As long as a trace of Yin fluid remains, irrigation (nourishing Yin) can still be applied; if Yin is already exhausted, rescue is futile. In summary, Yang collapse leads to rapid death, but urgent restoration of Yang yields quick results; Yin collapse leads to slower death, but urgent preservation of Yin yields difficult results. If treated properly at the onset of Taiyang disease, how could it reach such a state? Thus, we know that contemporary practitioners who recklessly label conditions as Shanghan (Cold Damage), fail to investigate the etiology, disregard the patient's fluids, and indiscriminately apply sweating methods for all Taiyang diagnoses, are indeed engaging in dangerous practices akin to wielding a blade blindly.
Question: What happens with the misapplication of purgation methods?
Answer: After the misapplication of purgation in Taiyang disease, if it manifests as Xie Re Li (Collateral Heat Diarrhea), the treatment method should aim to retrieve the sunken pathogenic factors and resolve them through the Taiyang exterior. If the Middle Earth (Spleen/Stomach Qi) sinks, Li Zhong Wan (Regulate the Middle Pill) is urgent. If the Lower Origin (Kidney Yang) is exhausted, securing the lower jiao is urgent. If diarrhea with undigested food (Qing Gu) persists, urgent warming of the interior is required; without Si Ni Tang (Frigid Extremities Decoction), rescue is impossible. In these cases, True Yang is on the verge of perishing alongside the diarrhea, and restoring Yang allows no delay. If heat pathogens remain in the exterior, due to misapplied purgation, the exterior pathogens sink inward and cluster in the chest and heart region, leading to transformations such as Pi Syndrome (Glomus) or Jie Xiong (Chest Binding). Zhang Zhongjing stated: "Disease originating from Yang, if wrongly purged, heat enters and forms Jie Xiong; disease originating from Yin, if wrongly purged, forms Pi." For treating Heart-Under Pi, Zhang Zhongjing provided various Xie Xin methods (Draining Epigastrium formulas); for treating Jie Xiong, he provided Da Xian Xiong Tang (Major Inward Binding Decoction) and Xiao Xian Xiong Tang (Minor Inward Binding Decoction). Each method addresses the severity and urgency of the condition precisely. These methods are meticulous and allow for no deviation; they must be studied carefully. Contemporary practitioners dare not lightly test purgation methods for Taiyang disease. However, merely avoiding harsh purgatives like Mang Xiao (Natrii Sulfas) and Da Huang (Rhei Radix et Rhizoma) is considered cautious purgation, while aromatic and drying qi-moving agents, which deplete Zheng Qi (Upright Qi) the most, are used recklessly, leading to various adverse transformations, which I have witnessed frequently. Does one only commit the error of reckless purgation by using Mang Xiao and Da Huang?