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The stomach is the sea of water and grain, and externally corresponds to the ocean waters; thus, the ascending and descending movement of Stomach Qi occurs day and night like the tides. However, healthy individuals have such tidal rhythms without manifesting as fever. If pathogenic factors remain in the meridians, muscles, sinews, and bones, and emerge with the tidal rhythm, it results in fever. Therefore, one must examine which meridian was affected first and where the symptoms are most intense, treating according to the Six Meridians (Six Channels), which differs from the treatment for night fever. Night fever originates from Yin deficiency, whereas tidal fever is caused by pathogenic Qi; tidal fever subsides after a single episode, while night fever does not cool until dawn. Since the etiology and syndromes differ, the therapeutic methods also differ. (Tidal fever in Shanghan is listed in the Yangming Chapter.)

Zhang Zhongjing's *Shanghan Lun* (Treatise on Cold Damage) has clear and orderly structure; it consists of the original text and was not compiled by Wang Shuhe. The claim that it consists of fragmented bamboo slips is an error passed down through generations. Conditions such as wind, dampness, and thirst are not typical cold damage diseases, but because they occur in the Taiyang (Greater Yang) channel and resemble cold damage, they were placed at the beginning of the Taiyang Chapter. Warm diseases and warm wind originate from cold damage but are not sudden attacks of wind-cold, so they are distinguished within the Taiyang Chapter. Taiyang is the master Qi of all Yang channels; therefore, the disease of Taiyang is mentioned first, followed by Wind Strike (Zhongfeng) (Wind here refers to the Qi agitated by cold invasion, hence the title *Shanghan Lun* mentions Wind Strike first), then Cold Damage (Shanghan), then transmission between meridians, then Guizhi Tang syndrome, and finally Mahuang Tang syndrome. At the beginning of each of the Six Meridians chapters, it states "the disease of [a specific] meridian"; general principles applicable to all six meridians are summarized in the first chapter of Taiyang. The text is meticulously analyzed, with breaks and continuations. I added circles at these break points, similar to the chapter divisions in *Great Learning*, *Doctrine of the Mean*, and the works of Confucius and Mencius, to facilitate recognition by later learners. This arrangement belongs to Zhang Zhongjing, not Wang Shuhe.

Furthermore, the 113 formulas of Zhang Zhongjing are established based on the depth of pathological layers (Xingceng) and the dynamics of Yin-Yang and cold-heat, without distinguishing between wind and cold pathogens. If the pathogen is in the skin and hair pores, Mahuang Tang is appropriate; if in the muscle interstices, Guizhi Tang is appropriate. Thus, it is said that Guizhi Tang is originally for resolving the muscle layer. However, Guizhi Tang is used for Wind Strike because the initial wind pathogen does not block the skin pores but enters the muscle interstices, making Guizhi Tang the primary formula for Wind Strike. If cold pathogen persists after sweating and enters the muscle interstices, it also falls under Guizhi Tang syndrome. Therefore, when the pathogen is in Taiyang without distinguishing wind or cold, it is called Taiyang disease; when wind and cold are distinguished, it is called Taiyang Wind Strike, Wind Strike with fever, or Cold Damage. If both wind and cold pathogens can lead to Chaihu Tang syndrome, it is described as "Cold damage for five to six days"; if Wind Strike leads to Xianxiong Tang syndrome, it is described as "Floating pulse indicates wind" or "Cold damage for five to six days with Jiechest heat-solid." For Goutisan syndrome, it is described as "Cold damage and Wind Strike." Generally, upon initial infection, distinctions between wind and cold lead to classifications of Wind Strike and Cold Damage. If the disease is in Taiyang and involves the heat transformation of Taiyang, it is called Taiyang disease; if in Yangming and involving the dryness transformation of Yangming, it is called Yangming disease, without distinguishing wind or cold. Regarding Daqinglong Tang and Xiaoqinglong Tang syndromes, they involve the cold-water Qi of Taiyang. Above Taiyang, cold Qi dominates; thus, Taiyang has superficial Yang but root cold. Daqinglong Tang syndrome represents the combined pathology of Taiyang's superficial and root aspects; Xiaoqinglong Tang syndrome involves the Yang Qi of Taiyang stirring its water Qi. "Taiyang Wind Strike" means wind pathogen affecting Taiyang Qi. A floating and tight pulse: floating indicates wind, tight indicates cold; this is the struggle between heavenly wind pathogen and Taiyang cold Qi reflected in the pulse. Fever indicates wind transforming into heat in Taiyang; aversion to cold indicates pathology of Taiyang cold Qi; body pain indicates wind-cold affecting the physical form; absence of sweating indicates pathogenic and righteous Qi sinking inward; irritability indicates the transformation of Taiyang's superficial and root Qi. This is wind-heat pathogen in Taiyang combined with root cold pathology, hence using a compound of Mahuang and Guizhi, removing the bitter-neutral Shaoyao, replacing it with sweet-acrid Shigao, to vent directly from inside to outside. If there is sweating and aversion to wind, the wind pathogen is external, so it should not be taken. Sweat generation has two types: one from the exterior, blood sweat; one from the interior, Yangming water-grain sweat. Mahuang Tang is a formula for releasing the exterior and inducing sweat; Guizhi Tang resolves pathogens in the muscle interstices. Mahuang combined with Shigao vents Yangming water fluid sweat from the interior. Stirring Yangming when the pathogen is not in the interior causes muscle twitching, as Yangming governs muscles and tendons. A floating-slow pulse in cold damage indicates cold injuring Taiyang, with pathogenic and righteous Qi sinking together. Heavenly cold pathogen struggling with Taiyang Yang Qi at the skin surface results in a tight pulse. (Wind-struggle with cold, cold-struggle with Yang, i.e., Yin-Yang struggle, all result in tight pulses.) This cold injury to Taiyang transforms into heat, with pathogenic and righteous Qi combining and sinking, resulting only in a deficient-floating slow pulse. No body pain indicates pathogen is internal. Heaviness indicates sinking of Yang Qi. Occasional relief indicates righteous Qi attempting to exit. Taiyang and Shaoyin correspond in superficial-root relationship. If cold injures Taiyang presenting Shaoyin symptoms, the whole body and limbs become hot due to heat in the Bladder, leading to hematochezia. In the combination of superficial-root cold-heat, cold in Taiyang reverses to root heat; reaching interior Yin resonates with Shaoyin Fire Qi. Hence, "without Shaoyin symptoms, use Daqinglong Tang to release." The previous chapter describes wind-stirred pathogen entering interior but still affecting form, showing floating-tight pulse and pain, suitable for Daqinglong Tang. This chapter describes cold-condensing Qi entering interior without form pain, fearing transmission to Shaoyin, utilizing the momentary relief of rising Yang Qi, using Daqinglong Tang to release. This is wind-cold pathogen affecting Taiyang superficial Yang and stirring root Qi. Also, cold damage with unresolved exterior and fluid retention in the epigastrium involves Taiyang Yang Qi stirring Bladder water Qi. Dry retching is water Qi counterflow. (Water-fire interaction is righteous Qi; water Qi surging upward is pathogenic Qi.) Fever is cold in Taiyang transforming to heat. Cough is water Qi connecting to Lung. Pathology of exterior Yang Qi stirring water Qi leads to failure of Qi transformation and water movement, causing thirst, diarrhea, dysphagia, difficult urination, hypogastric fullness, or wheezing, suitable for Xiaoqinglong Tang. Using Mahuang, Guizhi, Gancao, Shaoyao to clear exterior pathogens; Ganjiang, Banxia, Xixin to assist Fire-Earth Qi; Wuweizi sourness to assist Spring Wood Qi to drain Winter Water Qi. Thirst indicates fire stagnating above and water counterflow below; remove drying Banxia, add Gualougen to promote fluid ascent. Diarrhea indicates cold water below and failing Fire Qi descent. Raohua is cold and water-nature; using upper flower calyx, boiled red, symbolizes heart, guiding fire warmth downward. Water meeting cold struggles, causing dysphagia; add Fuzi to disperse cold. Difficult urination and hypogastric fullness indicate Earth being insulted by overacting element, failing to control water; add Fuling to tonify Middle Earth and attack water evil. Wheezing adds Xingzi to benefit Lung Qi. Exterior pathogen entering interior and stirring water Qi requires removing Mahuang. Also, cold damage with fluid retention in epigastrium, cough with slight wheezing, no thirst after sweating, but thirst after taking medicine indicates cold departing and resolution approaching; treat with Xiaoqinglong Tang. Here, exterior pathogen is resolved, but cold-water Qi counters upward. Cough and slight wheezing indicate water Qi surging to Lung. Fever without thirst indicates obtaining Taiyang Qi transformation. Thirst after medicine indicates cold-water Qi dispersing externally and re-injuring Taiyang Qi; thus, continue with Xiaoqinglong Tang. The Classic states: Above Taiyang, cold Qi dominates; appearing in heaven, forming on earth; in heaven as cold, on earth as water. Heaven has Six Qi, Earth has Five Elements. Humans are born inheriting Heaven and Earth Qi, possessing these Five Elements and Six Qi. Thus, Daqinglong Tang syndrome involves Taiyang Yang Qi stirring cold Qi; hence, use Daqinglong Tang to induce sweat, likened to heavenly dragon bringing rain. Xiaoqinglong Tang syndrome involves Taiyang Yang Qi stirring water Qi; hence, use Xiaoqinglong Tang, likened to dormant dragon draining winter water Qi. Similarly, Shaoyin disease treated with Zhenwu Tang involves Shaoyin stirring water Qi; Sini San treats Shaoyin receiving Minister Fire heat transformation stirring water Qi. Taiyang and Shaoyin are water organs and bowels with cold-heat transformations. External water stopping in Middle Jiao belongs to Wuling San syndrome. Etiologies differ, so treatments differ: there are formulas for releasing exterior, resolving muscle, dispersing cold, moving water, regulating Qi, regulating blood, treating chest-hypochondrium, treating abdomen-stomach, expelling evil, tonifying righteousness, great cooling, great heating, great tonification, great purgation, harmonizing, and combined cold-heat tonification-purgation. All derive from the depth of exterior-interior layers and cold-heat-deficiency-excess Qi transformations. (Mahuang/Guizhi distinguish layers; Da/Xiao Qinglong discuss Qi transformation.) Otherwise, merely wind and cold pathogens would not account for 389 syndromes. Understanding layers and Qi transformation grasps more than half of Shanghan principles.