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Zhao Sizhen stated: Examining Zhang Zhongjing's treatise, it is said that in winter, one catches cold pathogens which lie dormant in the skin and muscles without causing immediate illness. Due to the warming qi of spring, this transforms into a heat syndrome. The term "transform" (bian) implies alteration. At this stage, the latent cold pathogens change according to the spring and summer qi into warm diseases or heat diseases. Once transformed, they can no longer be referred to as cold diseases. Thus, Zhang Zhongjing's statement that warm diseases do not present aversion to cold becomes understandable. *The Book of Vitality* (Ren Shu), when discussing warm diseases, states that yang-heat is not yet abundant and is constrained by cold. How could it be said that if latent cold has already transformed into warmth, cold can still constrain its yang-heat? Furthermore, in discussing heat diseases, it states that yang-heat is already abundant and cannot be constrained by cold. It should not be described as a cold disease again. This is because during spring and summer, the yang-heat has already transformed, and the latent cold no longer possesses the property of constraining yang-heat.

However, there are cases where external cold pathogens can suppress yang-heat; these are termed epidemic cold diseases (Shi Xing Han Ji). This refers to what Zhang Zhongjing called epidemic cold diseases occurring after the Spring Equinox and before the Autumn Equinox, caused by sudden cold weather. In the third and fourth months, when yang qi is still weak, suppression by cold results in milder heat symptoms. In the fifth and sixth months, when yang qi is abundant, suppression by cold results in more severe heat symptoms. In the seventh and eighth months, when yang qi is declining, suppression by cold results in slight heat symptoms. Therefore, it is known that the discussion on the waxing and waning of yang qi applies similarly to both epidemic cold diseases and warm/heat diseases. However, the nature of sudden cold (Bao Han) differs fundamentally from the nature of latent cold that has already transformed. If names are not correct, words are not in order. Zhang Zhongjing also stated that these diseases resemble warm diseases and summerheat diseases, but their treatments differ significantly; the key lies in distinguishing the disease origin. The distinctions among cold, heat, and warm dictate clearly whether the medication used should be cooling or warming.

Mr. Zhao explained doubts regarding *The Book of Vitality*: There are many questionable points in *The Book of Vitality*, and even some in Zhang Zhongjing's treatise. For instance, regarding Baihu Tang (White Tiger Decoction), Zhang Zhongjing explicitly stated it should not be used if the exterior syndrome is unresolved. Yet, in the syndrome for Baihu Jia Renshen Tang (White Tiger Decoction plus Ginseng), one text mentions aversion to wind, while another mentions aversion to cold. Does this not imply using Baihu Tang despite an unresolved exterior? Generally, aversion to wind is mild, appearing only on the back and not as severe as aversion to cold; "occasional" chills mean they come and go intermittently, indicating the exterior syndrome has lightened, unlike the previous syndrome with floating-tight pulse, fever, and absence of sweating which remained completely unresolved. In such cases, accompanied by high fever and intense thirst, the use of Baihu Tang is unquestionable.

He further explained: Regarding Zhang Zhongjing's discussion on Taiyang Disease (Taiyang Bing), after eight or nine days, presenting like malaria with fever and aversion to cold, where heat predominates over cold, the patient does not vomit, bowel movements and urination are relatively normal, attacks occur two or three times a day, and the pulse is slightly slow, this indicates impending recovery. If the pulse is faint and there is aversion to cold, this indicates deficiency of both yin and yang, and one must not induce sweating, purge, or emetic therapy. If the face appears reddish, the disease is not resolving because small amounts of sweat cannot be produced, leading to body itching; Guizhi Mahuang Ge Ban Tang (Cinnamon Twig and Ephedra Half-Dose Decoction) is appropriate. Zhang Zhongjing's intent was likely to treat the sixteen characters—"eight or nine days, like malaria, fever and aversion to cold, heat more than cold"—as the cumulative syndrome from onset to now. The following text serves as preventive advice for potential changes, which should be read in three parts.

If the patient does not vomit, bowel movements and urination are normal, attacks occur two or three times a day, and the pulse is floating and slow, it indicates impending recovery. This section signifies harmonious exterior with no pathogenic disturbance. A faint pulse here means the pathogen is weakening and slowing down; yin and yang are balanced, and both pulse and symptoms show signs of approaching peace, suggesting spontaneous recovery without inducing sweat. If the pulse is faint and there is aversion to cold, this indicates deficiency of both yin and yang, precluding sweating, purging, or emesis. This section requires warming treatment. If the face is reddish, indicating non-resolution due to inability to produce sweat and resulting body itching, Guizhi Mahuang Ge Ban Tang is indicated. This section requires sweating for recovery.

*The Book of Vitality* failed to comprehend the textual meaning, mistakenly treating the nine characters "no vomiting, normal bowel and urinary functions"—which originally indicated recovery—as a syndrome requiring the half-dose decoction for sweating. It omitted the statements regarding contraindications for sweating, emesis, and purging, as well as the indications for the half-dose decoction. Applying the wrong medicine to this syndrome and inducing sweat inappropriately, why would one do so? This demonstrates that Zhang Zhongjing's writing style often follows such patterns. Students must repeatedly study carefully, familiarize themselves with the underlying intent, and the principles will become clear, ensuring accurate treatment. Thus, Zhao Sizhen remarked: In Zhang Zhongjing's works, a difference of one character leads to a therapeutic outcome as different as heaven and earth. Must readers not seek the meaning within every word and phrase?