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Note: The *Treatise on Cold Pathogenic Diseases* (*Shanghan Lun*) states: In Taiyang disease (a syndrome caused by pathogenic factors affecting the Taiyang meridian), characterized by headache, fever, aversion to cold, body pain, vomiting and qi rebellion, with pulse tightness in all three positions (cun, guan, chi), absence of sweating, and wheezing, it is named Cold Damage (*Shanghan*), and Ma Huang Tang (Ephedra Decoction) is the primary treatment. It also states: In Taiyang disease, characterized by headache, fever, sweating, aversion to wind, and a slow pulse, it is named Wind Strike (*Zhongfeng*), and Gui Zhi Tang (Cinnamon Twig Decoction) is the primary treatment. This distinguishes Cold Damage by the absence of sweating and tight pulse, thus requiring Ma Huang Tang; and Wind Strike by the presence of sweating and slow pulse, thus requiring Gui Zhi Tang. This is the distinction between them.

Furthermore, the *Treatise* states: Gui Zhi Tang is originally intended to resolve the muscle layer; if the patient has a floating-tight pulse, fever, but no sweating, it must not be administered. One must always keep this in mind to avoid error. However, why does it also state: When the exterior syndrome of Taiyang disease has not resolved and the pulse is floating and weak, sweating should be induced, and Gui Zhi Tang is appropriate? And when Yangming disease (a syndrome caused by pathogenic factors affecting the Yangming meridian) presents with fever around the Shen hour (3-5 PM) and a deficient-floating pulse, sweating should be induced, and Gui Zhi Tang is appropriate for inducing sweat. Does this imply that Gui Zhi stops sweating?

The difference lies in the composition: Ma Huang Tang lacks Shao Yao (Paeoniae Radix Alba) but uses Ma Huang (Ephedrae Herba); Gui Zhi Tang lacks Ma Huang but uses Shao Yao. Generally, Gui Zhi has a dispersing nature, while Shao Yao has an astringent nature. When Shao Yao accompanies Gui Zhi, Gui Zhi’s action becomes less harsh; when Gui Zhi accompanies Shao Yao, Shao Yao’s cold nature is mitigated. However, Shao Yao’s mildness cannot ultimately overcome Gui Zhi’s vigor. Moreover, Shao Yao nourishes and harmonizes Ying Qi (nutritive qi circulating within the vessels), which sufficiently assists Gui Zhi in inducing sweating. Therefore, Gui Zhi Tang is also a dispersing formula, but whereas Ma Huang Tang is potent and harsh, Gui Zhi Tang is gentle and slow.

Thus, for deep-seated and stubborn cold pathogens, one fears that using Gui Zhi Tang will fail to release the exterior and instead exacerbate heat. Therefore, cases with a tight pulse and no sweating are suitable for Ma Huang Tang rather than Gui Zhi Tang. Conversely, cases with a floating-slow pulse and sweating, or a floating-weak pulse, indicate shallow wind pathogens, making Gui Zhi Tang suitable rather than Ma Huang Tang. Hence, Ma Huang Tang is the premier formula for releasing the exterior, while Gui Zhi Tang is secondary.

Contemporary physicians often fail to discern this nuance. Upon hearing "those without sweating should not receive Gui Zhi," they erroneously conclude that Gui Zhi stops sweating. This is a significant mistake. They do not realize that the sweating-stopping effect resides in Shao Yao, not Gui Zhi. Gui Zhi is warm in nature and strengthens Wei Qi (defensive qi). As stated in the *Neijing*: Excess Yin leads to profuse sweating and cold sensations. Zhang Zhongjing stated: Sweating occurring despite extreme cold indicates Yang Collapse (loss of Yang qi); tonifying Yang can stop sweating, in which case Gui Zhi is indeed appropriate.

Additionally, the *Treatise* distinguishes Cold Damage (no sweat, tight pulse) from Wind Strike (sweat, slow pulse) based on wind versus cold. However, the indications for Da Qing Long Tang (Major Blue Green Dragon Decoction) state: In Wind Strike, with a floating-tight pulse, fever, aversion to cold, body pain, no sweating, and irritability, Da Qing Long Tang is indicated. Does this not show that Wind Strike can also present with a tight pulse and no sweating? This demonstrates that wind and cold are fundamentally close; wind is shallow while cold is deep. Shallow conditions belong to Yang, while deep conditions belong to Yin.

Moreover, recently observed cases of external cold invasion predominantly present as Cold Damage with fever, tight pulse, and no sweating. Cases of Wind Strike, characterized by slow pulse, sweating, and recurrent fever, are rarely seen. If they do occur, they are likely due more to internal causes than external ones. If scholars insist on distinguishing the yin-yang similarities and differences between "wind/cold" and the formulas "Ma Huang Tang/Gui Zhi Tang" to use as rigid arguments, they would be far off the mark. Refer to the preceding section on the differentiation of wind and cold for further examination.