（此系仲景原文）
中寒伤寒。截然两途。仲景论中溷杂而未及辩。以致后世之医。阴阳不明。寒热错治。其害大矣。愚以中寒者。
其证内外皆寒而多虚。伤寒者。其证外寒内热而多实。又中寒之寒真。伤寒之寒假。伤寒有传变。其势稍缓。中寒
每直入。其势最急。丹溪云。治之稍迟。去生甚速。指中寒也。愚因就六经篇原文。摘其中寒论例。悉为解释。俾
学人皆知中寒之证。与伤寒迥别。得此书而自无误治云尔。
太阳病。发汗。遂漏不止。其人恶风。小便难。四肢微急。难以屈伸者。桂枝加附子汤主之。（此条病。乃太
阳真寒证。风寒之邪。由背而入。直中少阴少停于表。即头项痛。腰脊强。其与热病有别者。止微痛微强耳。因其
人卫外之阳气本虚。不发热而但恶寒。此为阳虚人病中风证。粗工不察。误投麻黄等汤以发其汗。腠理大开。遂漏
不止。皮表不固。则其人恶风。又小便难者。汗外泄而亡津液。阳气内虚。不能施化也。四肢微急。难以屈伸者。
四肢为诸阳之本。汗多亡阳而脱液。液脱。则筋骨无以滋养。故微急而屈伸不利也。与桂枝汤以敛津液。加炮附子
以复阳气。）
（此方自原论中第十卷集入于此）
于桂枝汤方内。加附子一枚。炮去皮。破八片。余根据桂枝汤法煎服。
或问上条本太阳病误发汗。汗出不止。其用桂枝汤无疑矣。何为而加炮附子。余答云。内台方议云。病患阳气
不足而得太阳病。则知其人阳气本虚。及得病。又误发汗。汗多亡阳。阳气耗竭不作郁热。因成真阴证。非附子大
辛热之剂。不能散其余邪。复其阳气。
太阳病。下之后。脉促。胸满者。桂枝去芍药汤主之。若微恶寒者。去芍药方中。加附子汤主之。（此条病。
亦太阳真寒证。阳气内虚。故不发热。况风寒之邪在经。本无可下之法。下后脉促者。此胃腑未实。不应下而下之。
胃中阳气大伤。其脉必促而无力。胸中虚满。按之必软而不痛。乃邪客胸中而无实热也。太阳之经。风寒未解。故
用桂枝汤以散客邪。去芍药者。成注云。芍药益阴。阳虚者非所宜也。若其人又微恶寒。夫恶寒而日微。非发热恶
寒之比。此阳虚已极。故于去芍药方中。加炮附子。以温经助阳气。）
桂枝去芍药汤方
（此方并下方俱从原论中第十卷集入于此）
于桂枝汤方内。去芍药。余根据桂枝汤法。
(This is the original text by Zhang Zhongjing.)
Zhonghan (Cold Damage from Internal Cold) and Shanghan (Exogenous Cold Damage) are two distinct pathways. In Zhang Zhongjing's treatises, these two are mixed together without differentiation, leading to physicians of later generations failing to distinguish between Yin and Yang, and treating cold and heat conditions incorrectly, which causes great harm. I believe that in Zhonghan, the symptoms manifest as cold inside and outside with a tendency towards deficiency; in Shanghan, the symptoms manifest as external cold and internal heat with a tendency towards excess. Furthermore, the cold in Zhonghan is "true cold," whereas the cold in Shanghan is "false cold." Shanghan involves transmission and progression, with a relatively slower momentum; Zhonghan often strikes directly into the organs, with the most urgent momentum. Zhu Danxi said, "If treatment is delayed even slightly, death approaches very quickly," referring specifically to Zhonghan. Therefore, I have selected the relevant clauses regarding Zhonghan from the original text of the "Six Channels Chapter" and explained them all, so that students may know that the syndrome of Zhonghan is completely different from Shanghan, and by using this book, they can avoid misdiagnosis and mistreatment.
In Taiyang disease (Disease of the Taiyang Channel), after sweating therapy, perspiration continues to leak profusely. The patient fears wind, has difficulty urinating, slight stiffness in the four limbs making flexion and extension difficult. Guizhi Jia Fuzi Tang (Cinnamon Twig Decoction plus Prepared Aconite Root) should be used to govern this condition. (This clause describes a True Cold syndrome of the Taiyang channel. Wind-cold pathogens enter from the back, strike directly into Shaoyin, and pause briefly at the exterior, causing headache, neck stiffness, and spinal rigidity. The difference from heat diseases lies only in the mildness of pain and stiffness. Because the patient's defensive Yang Qi was originally deficient, there is no fever, only aversion to cold. This is a Wind-stroke syndrome in a person with Yang deficiency. Unskilled doctors failed to observe this and mistakenly administered Mahuang Tang (Ephedra Decoction) or similar formulas to induce sweating. This caused the pores to open widely, resulting in continuous leakage of sweat. With the exterior not secured, the patient fears wind. Regarding the difficulty in urination: profuse sweating leads to the loss of body fluids, and internal Yang deficiency prevents proper Qi transformation and distribution. The slight stiffness and difficulty in limb movement occur because the four limbs are the root of all Yang channels; excessive sweating leads to the loss of Yang and depletion of fluids. When fluids are depleted, sinews and bones lose nourishment, resulting in slight stiffness and impaired mobility. Guizhi Tang (Cinnamon Twig Decoction) is given to conserve body fluids, and Pao Fuzi (Prepared Aconite Root) is added to restore Yang Qi.)
(This formula was collected from Volume 10 of the original treatise and inserted here.)
To the Guizhi Tang (Cinnamon Twig Decoction) formula, add one Fuzi (Aconiti Lateralis Radix Praeparata), prepared, peeled, broken into eight pieces. Prepare and administer the remaining ingredients according to the method for Guizhi Tang (Cinnamon Twig Decoction).
Someone asked: The previous clause originally described Taiyang disease where mistaken sweating therapy led to unceasing perspiration. Using Guizhi Tang (Cinnamon Twig Decoction) is unquestionable. Why add Pao Fuzi (Prepared Aconite Root)? I answer: According to Neitai Fangyi (Discussions on Formulas of the Inner Platform), if a patient with insufficient Yang Qi contracts Taiyang disease, it indicates that their Yang Qi was originally deficient. After contracting the disease, mistaken sweating therapy causes profuse sweating and loss of Yang Qi. The Yang Qi is exhausted without generating stagnant heat, thus becoming a True Yin (True Cold) syndrome. Only a potent hot and pungent agent like Fuzi (Aconiti Lateralis Radix Praeparata) can disperse residual pathogens and restore Yang Qi.
In Taiyang disease (Disease of the Taiyang Channel), after purgative therapy, the pulse is rapid/urgent, and there is chest fullness. Guizhi Qu Shaoyao Tang (Cinnamon Twig Decoction minus Moutan Cortex/Paeoniae Radix) should be used to govern this. If there is slight aversion to cold, add Fuzi (Aconiti Lateralis Radix Praeparata) to the Guizhi Qu Shaoyao Tang (Cinnamon Twig Decoction minus Moutan Cortex/Paeoniae Radix), i.e., Guizhi Qu Shaoyao Jia Fuzi Tang (Cinnamon Twig Decoction minus Moutan Cortex/Paeoniae Radix plus Prepared Aconite Root) should be used. (This clause also describes a True Cold syndrome of the Taiyang channel. Internal Yang Qi is deficient, hence there is no fever. Moreover, wind-cold pathogens in the meridians do not warrant purgation. After mistaken purgation, the pulse becomes rapid/urgent because the Stomach Fu organ is not full/excess, yet purgation was applied. This severely injures the Yang Qi in the Stomach, causing the pulse to be rapid/urgent and forceless. There is empty fullness in the chest, which feels soft and non-tender upon pressure, indicating pathogenic factors lodged in the chest without excess heat. The wind-cold on the Taiyang meridian has not resolved, so Guizhi Tang (Cinnamon Twig Decoction) is used to dispel the lodged pathogens. Shaoyao (Paeoniae Radix) is removed because, as Cheng Wuji noted, Shaoyao (Paeoniae Radix) benefits Yin and is unsuitable for those with Yang deficiency. If the patient additionally exhibits slight aversion to cold, this "slight" aversion differs from the aversion to cold accompanying fever. This indicates extreme Yang deficiency. Therefore, Pao Fuzi (Prepared Aconite Root) is added to the Guizhi Qu Shaoyao Tang (Cinnamon Twig Decoction minus Moutan Cortex/Paeoniae Radix) to warm the meridians and assist Yang Qi.)
Guizhi Qu Shaoyao Tang (Cinnamon Twig Decoction minus Moutan Cortex/Paeoniae Radix) Formula
(Both this formula and the following one were collected from Volume 10 of the original treatise and inserted here.)
Remove Shaoyao (Paeoniae Radix) from the Guizhi Tang (Cinnamon Twig Decoction) formula. Prepare and administer the remaining ingredients according to the method for Guizhi Tang (Cinnamon Twig Decoction).