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(Shanghan Lun by Zhang Zhongjing has been expounded in great detail by predecessors; I dare not add more, but will briefly list the key points.)

According to Zhang Zhongjing's *Shanghan Lun* (Treatise on Cold Damage): The climate of spring is mild, summer is hot and humid, autumn is cool and clear, and winter is cold and fierce. This is the order of the normal qi of the four seasons. Only in winter, when it is severely cold, if one moves away from cold and seeks warmth, one will not be injured by accidentally contracting cold. Infants in swaddling clothes, or children who grow up with weak constitution, if improperly cared for, will suffer from a multitude of diseases; thus, infantile Shanghan often occurs in autumn and winter. Or during dusk or early morning, because autumn and winter are cold, getting up at night to relieve oneself, or suddenly going out into wind-cold areas, being invaded by pathogenic factors, immediately resulting in sneezing, body tremors, slightly cold fingertips, invisible Guan position pulse pattern (Guan Wen), redness of face and eyes, painful and uncomfortable expression, coarse breathing, body heat, anhidrosis, and aversion to cold—this is Shanghan. If the complexion is bright without pain, sweating, and aversion to wind, this is Shangfeng (Wind Injury). These symptoms are similar yet different from those in adult pulse diagnosis departments, and treatment methods are also not far apart, except for other circumstances. Because infants are pure Yang bodies, medications should not be too hot; this is the principle known as "treating infants without heat" among the Eight Methods of Medicine. However, the sixteen chapters and three hundred and ninety-seven methods of Zhang Zhongjing, referred to by former sages as *Jinkui Yaolue* (Essential Prescriptions of the Golden Cabinet), are indeed precious! Additionally, there are differences in the excess and deficiency of the Five Movements (Wu Yun), and variations in the reversal, compliance, overcoming, and hiding of the Six Qi (Liu Qi), producing disasters that manifest in the human body. When guest pathogens invade and organ qi is weak, illness ensues, termed Shiqi (Seasonal Qi), which differs from Shanghan; it refers to the aberrant qi of the four seasons. For example, spring should be warm but is cold, summer should be hot but is cold, autumn should be cool but is hot, winter should be cold but is warm. Having the qi of another season, people contract illness through exposure, regardless of distance. One must determine which meridian and zang-fu are affected, identify the deviation, and treat according to the method. This is the profound essence of Zhang Zhongjing. However, treating infantile Shanghan and Shangfeng shares similarities with adult formulas: for fever with no sweat, Mahuang Tang (Ephedra Decoction) is the primary treatment. It is established for exterior excess with no sweat, where Ying Blood (Nutritive Blood) is affected by pathogens. Sweating releases the cold pathogen, preventing stagnation. For body heat with spontaneous sweating, Guizhi Tang (Cinnamon Twig Decoction) is used. It is established for exterior deficiency with spontaneous sweating, where Wei Qi (Defensive Qi) is affected by pathogens. Releasing the muscle layer disperses wind pathogens, preventing obstruction. The key to treating any disease lies in careful observation at the moment of consultation to avoid errors.

Shanghan complicated by fright presents with sudden fright upon contracting cold, lethargy, slight fever, irritability or thirst, frequent startles during sleep, twitching of hands and feet, red face, phlegm and cough, teeth grinding, yawning, pale cyan color at Shan Gen (root of nose) and Zhun Tou (tip of nose), and purple-red marks under both eyebrows. Regarding its etiology, it may result from fright-induced fever followed by cold contraction, or cold contraction followed by fright, causing two types of heat to multiply. For such presentations, Baijie San (Hundred-Resolution Powder) should be used to release the exterior, followed by Niubang Tang (Arctium Decoction) to treat fright-heat and disperse pathogenic factors. If the condition appears severe, Rongrong Danggui San (Cistanche and Angelica Powder), Sansanjie San (Three-Dispersions Powder), Wujing Wan (No-Fright Pill), or Hupo Baolong Wan (Amber Embracing Dragon Pill) may be administered intermittently.

Shanghan complicated by food retention presents with runny clear nose, headache, fever, lighter symptoms by day and heavier by night, occasional vomiting and belching with sour odor, variable yellow-red-white complexion, slightly swollen eyelids, alternating chills and fever, irritability, thirst, abdominal pain, and distension. All these result from excessive dietary injury compounded by wind-cold contraction, leading to agitation and heat generation. Heat and food steam in the Stomach, the Sea of Water and Grain. When Spleen is sufficient, it can transform and transport; now, Spleen and Stomach are damaged by diet, causing this disease. First, decoct Xiaochaihu Tang (Minor Bupleurum Decoction) with fresh ginger juice, or mix Wuling San (Five-Ingredient Powder with Poria) with ginger juice and boiling water to resolve cold pathogen, warm stomach, and stop vomiting. Next, use Baijie San and Danggui San decocted with water and ginger to disperse exterior pathogens and warm correct stomach qi. Wu Xi Wan (Black Rhinoceros Horn Pill) removes accumulation, Yunqi San (Qi-Balancing Powder) stops supplementation [note: likely means regulating qi], and Shenling Baizhu San (Ginseng, Poria, and Atractylodes Macrocephala Powder) regulates Spleen and Stomach.

After purgation, Shangfeng presents with slightly red cheeks, swollen eyelids, fever, phlegm, wheezing, and reduced appetite. This occurs because external wind-cold was not dispersed, purgation was inappropriate, pathogens remained, and correct qi was damaged. Delayed regulation leads to disharmony of Ying and Wei, loss of correct qi control, weak Spleen and Stomach, and further dietary injury, termed Shifu (Food Recurrence). Use Xiaochaihu Tang to harmonize, followed by Sanleng San (Curcuma Longa Powder) for regulation. Alternatively, after purgation, body qi is weak, pores are loose, and sudden exposure to wind-cold makes one susceptible to re-infection by external pathogens invading the skin and hair. Skin and hair are the exterior of the Lung. Wind-cold invading the exterior combines internally with the Lung Meridian, causing phlegm-heat and wheezing, as the Lung governs Qi. Dispersal is also indicated here. Once exterior pathogens recede, regulate the Spleen to solidify the Earth of the Middle Jiao, preventing external invasion. Use Wuling San plus Mahuang (Ephedra) with nodes removed and roots retained, soaked in boiling water, decocted with water and ginger to benefit both interior and exterior. Jiebiaosan (Exterior-Resolving Powder), Xingxing San (Awakening Powder), Zhishi Tang (Immature Bitter Orange Decoction), or Danggui San plus Chenpi (Tangerine Peel) decocted with water and ginger can be used to harmonize middle and disperse.

Shanghan complicated by wind resembles previous conditions but features red face, body heat, coarse breathing, slight wheezing, tearing, thirst, warm hands and feet, cold sweat at Taiyang area, drooling down the chest, and occasional aversion to wind. This arises because initial Shanghan fever was not resolved for a long time, allowing transmission inward, then wind was contracted. Wind and heat struggle internally, causing heat accumulation in Heart and Spleen, forcing heat upward to cause sores in mouth and tongue, termed Shanghan complicated by wind. Various heats draw out Liver Wind, causing eye discharge and tearing, dry mouth, thirst, and warm hands—indicating pathogen transmitting inward. Continuous drooling and sores indicate steaming heat. Cold sweat at Taiyang indicates exterior deficiency. Pathogen excess with exterior deficiency places the syndrome between exterior and interior; use Xiaochaihu Tang plus Guizhi (Cinnamon Twig). To disperse Liver Wind, use Qianghuo San (Notopterygium Powder). To harmonize, use Sishun Yin (Four-Compliance Drink). To clear upper Jiao heat, oral and tongue symptoms will resolve, and re-contracted pathogens will dissipate.

Wind-Cold Mutual Syndrome: *Renhe Shu* states: Pulse resembles Guizhi Tang pattern but with no sweat; illness resembles Mahuang Tang pattern but with irritability. Wind injures Wei Qi, Cold injures Ying Blood. When both Ying and Wei are diseased, Zhang Zhongjing uses Da Qinglong Tang (Major Blue Green Dragon Decoction). Ying circulates within vessels, Wei outside. If both are deficient, disease arises. Younger children suffer due to improper care and failure to avoid wind-cold. Older children may suffer from rain/water exposure, overheating then undressing, or sudden outdoor exposure, allowing external pathogens to attack deficiency, closing pores and stopping sweat, leading to alternating cold/heat and confusion, termed Wind-Cold Mutual Syndrome. Pediatric prescriptions differ in ingredients and dosages from adults. If this syndrome is treated with sweating, removing wind-cold, only Qi-regulating and Phlegm-resolving measures should follow. Avoid harsh tonics, as heat will rebound with tonification, causing other syndromes. Initially use Xionghuang San (Realgar Powder) decocted with water, ginger, scallion, and mint, taken warm in three doses. Sweating indicates cure, preventing opisthotonos. Follow with intermittent Danggui San and Xingxing San. If phlegm persists, use Niubang Tang, Ruyi Gao (Ruyi Ointment), or Banxia Wan (Pinellia Pill).

Jie Xiong (Knotting Chest) Shanghan presents with redness at inner eyebrows, purple lips, blue nose, cough, mouth pain, phlegm knot, shortness of breath, unproductive cough, body heat, sweating, exposed white sclera, and stiff neck unable to flex or extend, resembling Rou Jing (Flaccid Spasm). Jie Xiong syndrome resides in the high part of the body; thus, the Classic says: "For high pathology, induce vomiting; for low pathology, drain thoroughly." Jie Xiong is like binding that cannot be untied. Yang Qi receives Qi in the chest; pathogenic factors bind with Yang Qi, remaining fixed and unresolved, unlike empty irritability or solid accumulation. High chest diaphragm swelling, spontaneous pain without pressure, is Major Jie Xiong. Pain only upon pressure is Minor Jie Xiong, involving water-cold or heat-knotting. For all these, lift the low, depress the high. Zhang Zhongjing treats high pathogen of Jie Xiong with descending methods to resolve solidified pathogens. *Neijing* states: "Even large knots can be resolved." Generally, knots in Shanghan require direct-acting agents to resolve. For Minor Jie Xiong, Zhang Zhongjing uses Xiao Xianxiong Tang (Minor Chest-Knotting Decoction). Common children often have Minor Jie Xiong, but Xianxiong Tang contains Huanglian (Coptis), which is extremely bitter and difficult to administer to infants. For infants, use Heding Dan (Crane Top Pill). For very small children, add Kuanqi Yin (Qi-Widening Drink) and Kuanre Yin (Heat-Widening Drink) to this pill, mixed with ginger juice and tea infusion to heal spontaneously. For six-to-seven-year-olds, administer Xiao Xianxiong Tang with honey for effect.

Huai Zheng (Ruined Syndrome) Shanghan presents with purple lines on Yintang (between eyebrows), grayish-white lips, yellow and thin limbs, alternating vomiting and diarrhea, alternating chills and fever, reduced appetite. Generally caused by external contraction of wind-cold-damp-heat and internal irregular eating/drinking, failing to maintain health, leading to deepening transmission. Physicians fail to distinguish exterior/interior, excess/deficiency, and misuse sweating/purgation, causing Yin-Yang reversal, pathogen dominance, and correct qi decline. Stomach takes five flavors to nourish Five Zang; Spleen takes five flavors to separate clear/turbid and nourish bones. Improper sweating/purgation damages Ying and Wei. Ying and Wei arise from Middle Jiao; clear Qi becomes Ying, turbid Qi becomes Wei, heavy turbid Qi becomes dregs and descends. Invaded by Six Evils, improper treatment causes external pathogens to grow daily, correct qi to deviate, Stomach Qi to weaken, and many transformed syndromes to appear: green-yellow dysentery, vomiting/chills-fever, swelling/distension/hemiplegia, Five Kindling Parasites, Eight Dysenteries, Dingxi Bulu (wasting syndrome). Transformations vary, each with specific discussions, treat according to syndrome. Initially, administer Jiawei Baishaoyao Tang (Modified White Peony Root Decoction) to harmonize.