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A question is raised: Why is aversion to cold (Ehan) considered a exterior syndrome? The answer is: The exterior of the human body belongs to Yang and the exterior level. Cold pathogen belongs to Yin. When the exterior is deficient, it is invaded by cold, which is termed as excessive Yin and deficient Yang. Due to deficient Yang failing to warm the skin and defensive Wei Qi, the exterior becomes empty; thus, even in a sealed room, one will pull clothes to cover up. This is called aversion to cold. The Classics state: "In cases of excessive Yin and deficient Yang, sweating therapy leads to recovery." Therefore, aversion to cold belongs to exterior syndromes.

Another question arises: Many texts mention that interior syndromes also present with aversion to cold. Why is this so? The answer is: Aversion to cold in interior syndromes results from direct invasion (Zhizhong) of cold pathogens into the interior, not from transmission via meridians. Once pathogens transmit into the interior, they transform into heat pathogens, inevitably causing aversion to heat (Ai Re). How can there be aversion to cold then? However, how do we distinguish between the aversion to cold in Taiyang disease and that caused by direct invasion? If a patient has headache, fever, and aversion to cold, it is an exterior syndrome; if there is no headache or fever but only aversion to cold, it is an interior syndrome due to direct invasion. The Classics state: "Fever with aversion to cold originates from Yang [exterior]; absence of fever with aversion to cold originates from Yin [interior]."

Another question: In Yangming Fu-organ disease, if there is dry mouth and thirst accompanied by slight aversion to cold on the back, is this not an interior syndrome resulting from transmission? The answer is: The presence of aversion to cold indicates that the exterior pathogen has not yet fully resolved. Because the dryness and thirst are severe, Baihu Jia Renshen Tang (White Tiger Decoction plus Ginseng) is used. This is a flexible application. Zhang Zhongjing stated: "If there is fever and no sweat, indicating the exterior is unresolved, Baihu Tang should not be given. If there is thirst for water and no exterior syndrome, Baihu Jia Renshen Tang is the primary treatment." In this case, slight aversion to cold suggests the exterior pathogen is about to resolve, while dry mouth and thirst indicate intense interior heat. Hence, this formula is used. If there were no dry mouth and thirst, how could it be used?

Another question: If mistaken purgation leads to Jie Xiong (Chest Binding), with severe and urgent distending pain, what if aversion to cold is present? How should it be treated? The answer is: Jie Xiong is caused by physician's error in purgation. The current aversion to cold indicates that exterior pathogens remain unresolved and are binding in the chest. One must first release the exterior before administering Xiaoxiong Tang or Wan (Harmonizing Chest Decoction/Pills). If mistakenly attacked with purgatives, the exterior pathogens will bind further in the chest, leading to a more critical condition. Thus, in Jie Xiong syndrome, even a trace of aversion to cold requires dispersing the exterior first, followed by attacking the interior. This demonstrates that aversion to cold belongs to Taiyang exterior syndromes.

Question: Why is panting/chuan (Chuan) considered a Taiyang syndrome? Answer: The Lung governs the skin and hair and regulates the ascending and descending of Qi. When cold pathogens invade the skin and hair, Lung Qi cannot ascend and descend properly, resulting in panting. Consider Mahuang Tang (Ephedra Decoction): it contains Xingren (Apricot Seed), which is specifically set to stop panting. It is also stated: "For patients with chronic panting, Guizhi Tang (Cinnamon Twig Decoction) added with Houpo (Magnolia Bark) and Xingzi (Apricot Seed) is excellent." This explicitly states that panting belongs to exterior pathogens.

Another question: Since panting relates to the Lung and the exterior, why does the *Zhangzhang Fu* (Song of Finger Points) state that panting and fullness without aversion to cold should be treated with purgation for recovery? The answer is: In transmitted interior syndromes, internal heat binds tightly, feces are not unblocked, and hot qi rushes upward. This prevents the Lung Metal from performing its clearing and descending function, leading to urgent panting. This is caused by Stomach heat attacking the Lung, so purgation can be used to allow hot qi to circulate freely, thereby stopping the panting. However, if symptoms like aversion to cold are present, immediate purgation is contraindicated to avoid adverse outcomes.

Another question: How should panting in Yin syndromes be treated? The answer is: Panting in Yin syndromes results from Shaoyin channel cold invasion, where true Yang is severely deficient, and the Kidney fails to grasp Qi. This leads to cold limbs, deep and fine pulse, shortness of breath, and urgent panting. Li Zhong Tang (Regulate the Middle Decoction) and Sini Tang (Frigid Extremities Decoction) should be used to warm the body, supplemented by Bawei Wan (Eight-Ingredient Pill). If sweating occurs with moist hair and continuous panting, it is difficult to treat.