经言六经。而即继之曰。三阴三阳。五脏六腑皆受病。此何以说也。余请以
三阴概之可乎。伤寒传入三阴。已寒变为热矣。盖太阴者脾也。其经布胃
络嗌。故邪入之。则腹满而嗌干。然经既属脾。经病则脾亦病。脾主消磨。亦
失其职。况布于胃则食不化。而腹满络于嗌。则热伤阴而嗌干。且但曰满。
则邪犹在中焦。未可遽下。故腹满平以浓朴陈皮。嗌干和以葛根枳桔。此
虽治太阴之经。实即治阳明之腑也。少阴者肾也。其经络肺系舌本。故邪
入之。则口燥舌干。而渴。然经虽属肾。土旺则水必亏。肾为胃关。亦失传化。
况络于肺。则水不升而作渴。系于舌。则津益亡而口燥。此时邪热已深。仲
景所谓忽下以存津液。故实则大小承气下之。虚则六味地黄润之。此虽
治少阴之经。亦即治足阳明兼手太阳手阳明之腑也。厥阴者肝也。其经
循阴器而络于咽。故邪入之。则烦满而囊缩。厥阴者。阴之尽也。经虽属肝。
此时胃邪下陷。阳亢阴渴。肾水既亏。肝火弥炽。蓄热不解。则烦而且满。阴
气已极。则囊缩少泄。如果大便未下。急与下之。下后不解。即与黄连解毒
之类。宣散蓄热。庶或有生。此虽治厥阴之经。实即治五脏六腑俱受之病
也。不然。或谓邪入于脏。或谓邪入于腑。又为藏物之脏。纷纷不已。曷与正
之。
按三阴邪热。皆从三阳传入。而阳明失治尤多。始而过汗以竭其液。继
而过下以损其阴。液者。气之余也。阴者。血之属也。气血既损。则烦满燥
渴等症作矣。况无阳则阴无以生。无阴则阳无以化。三阴既亏。则腐熟
传道化物之司。愈失其职。仲景欲急下以存津液。岂无有窥其微者耶。
养葵先生出。直以六味补水。挽其源而治之矣。
经典著作中提到“六经”，紧接着又说：“三阴三阳，五脏六腑都会受到病邪侵袭。”这是什么意思呢？我试着用三阴经来概括说明，可以吗？
伤寒病邪传入三阴经时，寒邪已经转化为热邪了。太阴经对应的是脾脏。它的经脉分布到胃部并联络咽喉，所以邪气侵入后，会出现腹部胀满和咽喉干燥的症状。既然经脉归属于脾，那么经气受病，脾脏也会生病。脾主运化消化，此时也失去了正常职能。况且经脉布散于胃，导致食物无法消化而腹部胀满；络脉连接于咽喉，导致热邪损伤阴液而咽喉干燥。而且只提到“胀满”，说明邪气还在中焦，不可以立即使用攻下法。所以，治疗腹部胀满常用厚朴、陈皮；治疗咽喉干燥常用葛根、枳壳、桔梗。这虽然是在治疗太阴经的病，实际上也就是在调理阳明腑的病。
少阴经对应的是肾脏。它的经脉联络肺系和舌根，所以邪气侵入后，会出现口燥、舌干以及口渴的症状。虽然经脉归属于肾，但土（脾）旺盛则水（肾）必然亏损。肾是胃的关口，此时也失去了传化功能。况且经脉联络于肺，导致水液不能上升而产生口渴；系连于舌，导致津液更加耗亡而出现口燥。此时邪热已经很深，正如张仲景所说，要紧急使用下法来保存津液。所以实证用大承气汤或小承气汤攻下，虚证用六味地黄丸滋润。这虽然是在治疗少阴经的病，实际上也就是在调理足阳明经兼手太阳经、手阳明经的腑病。
厥阴经对应的是肝脏。它的经脉环绕生殖器并联络于咽喉，所以邪气侵入后，会出现心中烦闷、腹部胀满以及睾丸收缩的症状。厥阴是阴气的尽头。虽然经脉归属于肝，但此时胃中的邪气下陷，阳气亢盛而阴液枯竭，肾水已经亏损，肝火更加炽盛。蓄积的热邪无法解除，就会既烦闷又胀满；阴气已经极盛，就会出现睾丸收缩且排泄物减少。如果大便尚未通下，必须紧急给予攻下治疗。攻下后病情仍未缓解，就给予黄连解毒汤之类的方剂，宣散蓄积的热邪，或许还有生机。这虽然是在治疗厥阴经的病，实际上也就是在调理五脏六腑都受到病邪侵袭的疾病。不然的话，有人说是邪气进入脏，有人说是邪气进入腑，又是藏精之脏的说法，纷纷议论不休，不如对此加以纠正。
按：三阴经的邪热，都是从三阳经传入的，其中因为阳明经失治的情况尤其多。起初过度发汗导致津液枯竭，随后过度攻下损伤阴血。津液是气的余绪，阴血属于血的范畴。气血既然受损，那么烦闷、胀满、燥渴等症状就发作了。况且没有阳气，阴就无法生成；没有阴，阳就无法化生。三阴经既然亏损，那么负责腐熟水谷、传导糟粕的功能，就愈发失去其职掌。张仲景想要紧急攻下以保存津液，难道不是有洞察其微妙之处的人吗？
The classics mention the "Six Channels" (Liujing), and immediately follow with: "San Yin San Yang, the Five Zang organs and Six Fu organs are all subject to disease." What does this mean? I would like to attempt to summarize it using the Three Yin channels, is that acceptable?
When the pathogen of Cold Damage (Shanghan) transmits into the Three Yin channels, the cold has already transformed into heat. The Taiyin channel corresponds to the Spleen. Its meridian distributes to the Stomach and connects with the throat; therefore, when the pathogen enters, abdominal fullness and dryness of the throat occur. Since the channel belongs to the Spleen, disease in the channel implies disease in the Spleen. The Spleen governs digestion and transformation, but here it loses its function. Moreover, since it distributes to the Stomach, food fails to digest, leading to abdominal fullness; since it connects with the throat, heat damages Yin fluids, leading to dryness of the throat. Furthermore, the mention of only "fullness" indicates that the pathogen remains in the Middle Jiao, and purgation should not be rushed. Therefore, for abdominal fullness, Houpo (Magnolia Bark) and Chenpi (Tangerine Peel) are used to level it; for dryness of the throat, Gegen (Pueraria Root), Zhike (Aurantium Fructus), and Jiegeng (Platycodon Root) are used to harmonize it. Although this treats the Taiyin channel, it essentially treats the Yangming Fu organs.
The Shaoyin channel corresponds to the Kidney. Its meridian connects with the Lung system and the root of the tongue; therefore, when the pathogen enters, dryness of the mouth, dryness of the tongue, and thirst occur. Although the channel belongs to the Kidney, when Earth (Spleen) is prosperous, Water (Kidney) must be deficient. The Kidney serves as the gate of the Stomach, but here it loses its function of transmission and transformation. Moreover, since it connects with the Lung, water fails to ascend, causing thirst; since it ties to the tongue, body fluids are further depleted, causing dryness of the mouth. At this time, the pathogenic heat is deep-seated. As Zhang Zhongjing stated, one must urgently use purgation to preserve body fluids. Thus, for excess patterns, Dachengqi Tang (Major Order the Qi Decoction) or Xiaochengqi Tang (Minor Order the Qi Decoction) are used to purge; for deficiency patterns, Liuwei Dihuang Wan (Six-Ingredient Pill with Rehmannia) is used to moisten. Although this treats the Shaoyin channel, it essentially treats the Fu organs of the Foot-Yangming, Hand-Taiyang, and Hand-Yangming channels.
The Jueyin channel corresponds to the Liver. Its meridian circulates around the genitalia and connects with the throat; therefore, when the pathogen enters, vexation, fullness, and contraction of the scrotum occur. Jueyin represents the end of Yin. Although the channel belongs to the Liver, at this time, pathogenic factors from the Stomach have sunk downward, Yang is hyperactive, and Yin is thirsty. Since Kidney Water is already deficient, Liver Fire burns even more fiercely. If accumulated heat is not resolved, vexation and fullness will persist; if Yin qi reaches its extreme, scrotal contraction and reduced excretion will occur. If the stool has not yet been passed, urgent purgation is required. If the condition persists after purgation, formulas such as Huanglian Jiedu Tang (Coptis Decoction to Relieve Toxicity) are given to disperse accumulated heat, perhaps offering a chance of survival. Although this treats the Jueyin channel, it essentially treats diseases where the Five Zang and Six Fu organs are all affected. Otherwise, some argue that the pathogen enters the Zang organs, others that it enters the Fu organs, and there are endless debates about the organs that store essence; it is better to correct these views.
Note: The pathogenic heat of the Three Yin channels is transmitted from the Three Yang channels, and cases of mismanagement of the Yangming channel are particularly common. Initially, excessive sweating depletes fluids; subsequently, excessive purgation damages Yin. Fluids are the surplus of Qi; Yin belongs to Blood. Once Qi and Blood are damaged, symptoms such as vexation, fullness, dryness, and thirst arise. Moreover, without Yang, Yin cannot be generated; without Yin, Yang cannot transform. Once the Three Yin channels are deficient, the functions responsible for rotting and ripening food and transmitting waste lose their duties even more. Did Zhang Zhongjing's desire to urgently purge to preserve body fluids lack those who perceived its subtlety?
Mr. Yangkui appeared and directly used Liuwei Dihuang Wan (Six-Ingredient Pill with Rehmannia) to tonify Kidney Water, retrieving the source to treat the condition.