问曰。太阳病传入阳明。其状何若。答曰。太阳之为病。头项强痛而恶寒。其后恶寒将
自罢
。 然微汗出。此欲传阳明之候。汗出。潮热。不恶寒。反恶热。则阳明之外证悉具矣。
然阳明病从太阳传入。必审太阳病全罢。方可从阳明论治。若阳明证已见。而太阳证未罢者
。治当仍从太阳而不从阳明。故仲景于太阳初入阳明之候。特挈出两条。谓阳明病。脉迟汗
出多。微恶寒者。表未解也。可发汗。宜桂枝汤。阳明病。脉浮无汗而喘者。发汗则愈。宜
麻黄汤。盖风寒之邪。由表而入里。此将入未入之界。当逆挽其邪。使仍从太阳而解。至温
病初起。即不恶寒。热病初起。即汗出而渴。此在太阳病时。阳明证同时并见。更当急顾阳
明之津液。
不与风寒同法。此又仲景言外之意。可从无字句处悟入。故凡读仲景书。既从有字句处知其
定法。又当从无字句处参其活法。则庶几其可进于道乎。
问曰。阳明经病。可解表乎。答曰。阳明为水谷之海。输布津液。外主肌肉。无津液何
由得
汗。汗过多即伤津液。阳明病本自汗出。汗虽出热仍不解。正当急存胃中之津液。岂有再行
发汗之理。今人误以葛根汤为阳明表药。殊不知仲景葛根汤之制。以麻桂合葛根。仍属太阳
与阳明同治。不得执是方以治阳明经热。若潮热汗出。大渴引饮。此阳明证悉具。而太阳证
全
罢。亟当顾阳明之津液。以除渴而涤热。设误发其汗。则津液随竭。至入府之候。其宜下
不宜汗。更不必言矣。仲景于太阳中风太阳伤寒宜发汗之证。尚慎重不敢过发其汗。正以胃
中津液为重也。风寒如此。奚况温热哉。太阳如此。奚况阳明哉。
问：太阳病传入阳明，其症状表现如何？
答：太阳病的特征是头项强痛且恶寒。随后恶寒症状自然会消失，出现微微出汗，这是即将传入阳明的征兆。若出现出汗、潮热、不恶寒反而恶热的症状，则阳明病的外部证候就完全具备了。然而，阳明病如果是从太阳病传入的，必须仔细审查太阳病的症状是否已经完全消失，才可以按照阳明病进行论治。如果阳明证的迹象已经出现，但太阳病的症状尚未消除，治疗时应当仍然从太阳病入手，而不从阳明病入手。因此，张仲景在太阳病初入阳明之际，特别提出了两条原则：说“阳明病，脉迟，汗出多，微恶寒者”，说明表证未解，可以发汗，适宜用桂枝汤；又说“阳明病，脉浮，无汗而喘者”，发汗后就会痊愈，适宜用麻黄汤。这是因为风寒之邪由表入里，处于将入未入的界限，应当逆势挽留邪气，使其仍从太阳经解除。至于温病初起，一开始就不恶寒；热病初起，一开始就出汗且口渴。这种情况在太阳病阶段，阳明证同时出现，更应当紧急顾护阳明的津液。这与风寒病的治疗法则不同。这又是张仲景言外之意，可以从字句之外的地方领悟进去。所以凡是研读张仲景著作的人，既要通过有字句的地方了解其固定法则，又当从无字句的地方参悟其灵活变通的方法，这样或许就可以进入医道了。
问：阳明经病，可以解表吗？
答：阳明是水谷之海，负责输布津液，外部主司肌肉。如果没有津液，怎么能出汗呢？出汗过多就会损伤津液。阳明病本身就容易自汗出，虽然出汗但热势仍不解，正当紧急保存胃中的津液，哪里有再次发汗的道理呢？现在的人错误地把葛根汤当作阳明病的解表药，殊不知张仲景制定葛根汤，是将麻黄、桂枝与葛根合用，仍然属于太阳与阳明同治的方法，不能固执地用这个方子来治疗阳明经的热证。如果出现潮热、汗出、大渴引饮的症状，这说明阳明证完全具备，而太阳证已完全消除，应当紧急顾护阳明的津液，以消除口渴并清除热邪。假如错误地使用了发汗法，那么津液就会随之枯竭，到了邪气入腑的阶段，适宜用下法而不适宜用汗法，就更不用说了。张仲景对于太阳中风和太阳伤寒适宜发汗的证候，还慎重不敢过度发汗，正是因为在意胃中的津液。风寒病尚且如此，何况温热病呢？太阳病尚且如此，何况阳明病呢？
Question: When Taiyang disease transmits to Yangming, what are the clinical manifestations?
Answer: The characteristic of Taiyang disease is stiffness and pain in the head and neck accompanied by aversion to cold. Subsequently, the aversion to cold will naturally cease, and slight sweating may occur; this is a sign that the disease is about to transmit to Yangming. If sweating, tidal fever (潮热), absence of aversion to cold, and preference for heat are present, then all external signs of Yangming disease are fully manifested. However, if Yangming disease is transmitted from Taiyang disease, one must carefully verify that all symptoms of Taiyang disease have completely resolved before treating it according to Yangming disease principles. If signs of Yangming disease are already visible but symptoms of Taiyang disease have not yet ceased, treatment should still focus on Taiyang rather than Yangming. Therefore, Zhang Zhongjing specifically highlighted two scenarios at the stage where Taiyang disease initially enters Yangming: "In Yangming disease, if the pulse is slow, there is abundant sweating, and slight aversion to cold, the exterior is not yet resolved; sweating can be induced, and Guizhi Tang (Cinnamon Twig Decoction) is appropriate." And again: "In Yangming disease, if the pulse is floating, there is no sweating and wheezing, inducing sweating will lead to recovery, and Mahuang Tang (Ephedra Decoction) is appropriate." This is because wind-cold pathogens enter from the exterior into the interior; at this boundary of entering but not yet entered, one should reverse the pathogen's trajectory to allow it to resolve via the Taiyang channel. Regarding warm diseases (温病) at their onset, there is no aversion to cold from the beginning; regarding heat diseases (热病) at their onset, there is sweating and thirst from the beginning. In these cases, during the Taiyang phase, Yangming symptoms appear simultaneously, requiring urgent protection of Yangming's body fluids (津液). This differs from the methods used for wind-cold diseases. This is another layer of meaning implied by Zhang Zhongjing, which can be understood from beyond the literal text. Thus, anyone studying Zhang Zhongjing's works must learn his fixed rules from the explicit text and comprehend his flexible applications from the implicit meaning; only then can one hopefully advance into the Dao of medicine.
Question: Can exterior-releasing methods be used for Yangming channel disease?
Answer: Yangming is the sea of water and grain, responsible for distributing body fluids, and externally governs the muscles. Without body fluids, how can sweat be produced? Excessive sweating damages body fluids. Yangming disease inherently involves spontaneous sweating; even though sweat occurs, the heat does not resolve. At this point, it is imperative to urgently preserve the stomach's body fluids. How could there be any rationale for inducing sweating again? Modern practitioners mistakenly regard Gegen Tang (Kudzu Decoction) as an exterior-releasing formula for Yangming disease. They fail to realize that Zhang Zhongjing's formulation of Gegen Tang combines Mahuang (Ephedrae Herba), Guizhi (Cinnamomi Ramulus), and Gegen (Puerariae Radix), which still belongs to the simultaneous treatment of Taiyang and Yangming. One must not rigidly apply this formula to treat heat in the Yangming channel. If symptoms such as tidal fever, sweating, and intense thirst with desire to drink are present, indicating that Yangming signs are fully manifest and Taiyang signs have completely ceased, one must urgently protect Yangming's body fluids to relieve thirst and purge heat. If sweating is erroneously induced, body fluids will be exhausted. Once the pathogen enters the fu organs (腑), purgation (下法) is indicated rather than diaphoresis (发汗); this goes without saying. Zhang Zhongjing was cautious and avoided excessive sweating even in cases of Taiyang Wind Strike (中风) and Taiyang Cold Damage (伤寒) where sweating was appropriate, precisely because he valued the stomach's body fluids. If this applies to wind-cold, how much more so to warm-heat pathogens? If this applies to Taiyang, how much more so to Yangming?