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Commentary: The term "Zheng Shanghan" (True Cold Damage) refers to contracting cold pathogens, being exposed to cold winds, and damaging the Couli (skin pores). Mild cases manifest as Wind-Cold invasion, while severe cases present with high fever, headache, nasal congestion, and runny nose; these are the typical symptoms of Shanghan.

Furthermore, conditions such as Wind-Cold injury, Cold exposure, and Dampness invasion can all cause fever and fatigue, but typically without coughing.

There is also "Shanghan Jia Jing" (Cold Damage complicated by Fright), which occurs when a child contracts Shanghan while simultaneously experiencing fright; hence it is termed complicated by fright. There is also "Shanghan Jia Shi" (Cold Damage complicated by Food Stagnation), which occurs when cold pathogens are contracted during a state of food stagnation; hence it is termed complicated by food.

Generally speaking, if Shanghan presents with other symptoms resembling food stagnation, one must not rashly employ purgative methods. If purgatives are used too early, both the exterior and interior will become deficient. Even after subsequent regulation, this may result in "Huai Zheng" (Ruined Syndrome caused by misdiagnosis or mistreatment). While an adult's Ruined Syndrome can still be treated with medicine, a child's Ruined Syndrome is beyond remedy, which is truly lamentable!

In any case where Shanghan is accompanied by signs of fright, purgatives must not be used. Medicines for calming fright (Zhen Jing Yao) are only suitable for syndromes complicated by fright. For pediatric Shanghan, only exterior-releasing methods should be employed. Although exterior-releasing methods are used, excessive sweating in the child must be avoided. Examples include Wang Yinxiong's Dumixiao San (Duduzhong Mint Powder) and Renshen Qianghuo San (Ginseng and Notopterygium Decoction) from the *Heji Jufang* (Formulas of the Bureau of Taiyi).

If heat is located in the interior, manifesting as Zhanyu (delirious speech) and Zhengsheng (repetitive, low-volume speech), this indicates a syndrome requiring purgation. In such cases, only powder formulations should be used, such as Qibao Xixin San (Seven-Treasure Heart-Washing Powder) or Sishun Yin (Four-Compliance Decoction). Pill formulations should not be used, nor should medicines intended for resolving stagnation be used to force purgation. Otherwise, the heat will not dissipate, potentially leading to "Wugu Ganshi" (Gu Worm Malnutrition, a severe form of pediatric malnutrition).

For cases complicated by food stagnation, theory dictates that purgation is appropriate, and Zishuang Wan (Purple Frost Pill) is suitable. However, the dosage of purgatives must be determined based on the child's deficiency or excess condition, and the sequence of onset must be investigated. It may be that Shanghan occurred first followed by food stagnation, or vice versa. However, Shanghan and food stagnation often occur close together around meal times, making it difficult for mothers to discern the sequence. If one understands this principle, one should regulate the later-onset condition first. If the sequence remains unclear, one may first employ exterior release to observe, and only apply purgation once the interior syndrome is clearly established; this is the optimal approach.

Moreover, exterior-releasing and purgative treatments should not be applied simultaneously, as this leads to gain-and-loss complications. As stated in *Jiabao*: "The first three days, the pathogen is in the exterior; after three days, it is in the interior." This is merely a general approximation, and fear exists that improper transmission of this rule could cause harm. Generally, Shanghan in the exterior is treated by releasing the exterior, and Shanghan in the interior is treated by purging; one should not rigidly adhere to the number of days. If the pathogen is between the exterior and interior, harmonization should be employed, using Xiaochaihu Tang (Minor Bupleurum Decoction). If there is no improvement, wait for the pathogen to transmit to the interior and then use purgation as the best course of action. (Adults present with delirium, while children present with irritability and crying.)

One must not be impatient to achieve a cure. One must carefully examine and thoroughly investigate the differentiation between exterior and interior. If examination is unclear and medications are used recklessly and inappropriately, alas, how dangerous!