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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?