太阴之证，不必皆由少阳传来也，又间有自太阳传来者。然自少阳传来，为传经次第之正传，自太阳传
来则为误治之坏证矣。
《伤寒论》原文∶本太阳病，医反下之，因而腹满时痛者，属太阴也，桂枝加芍药汤主之；大实痛者，桂
枝加大黄汤主之。
太阳病误下之后，外感之邪固可乘虚而入太阴，究之，脾土骤为降下所伤，肝木即乘虚而侮脾土，腹中
之满而且痛，实由肝脾之相龃龉也。桂枝原为平肝、和脾（气香能醒脾，辛温之性，又善开脾瘀）之圣药，
而辅以芍药、甘草、姜、枣，又皆为柔肝扶脾之品，是桂枝汤一方，若免去啜粥，即可为治太阴病之正药也。
至于本太阳证，因误下病陷太阴，腹满时痛，而独将方中芍药加倍者，因芍药善治腹痛也。试观仲景用小柴胡
汤，腹痛者去黄芩加芍药，通脉四逆汤腹痛者，去葱加芍药此明征也。若与甘草等分同用，为甘草芍药汤，
原为仲景复阴之方，愚尝用之以治外感杂证、骤然腹痛（须审其腹痛非凉者），莫不随手奏效。惟其所用之分
量，芍药倍于甘草是为适宜，盖二药同用原有化合之妙，此中精微固不易窥测也。且二药如此并用，大有开
通之力，则不惟能治腹痛，且能除腹满也。
惟此方中芍药加倍为六两，甘草仍为二两，似嫌甘草之力薄弱，
服后或难速效，拟将甘草亦加重为三两，应无药性偏重之弊欤。
【桂枝加芍药汤方】桂枝三两，芍药六两，甘草二两炙，生姜三两切，大枣十二枚擘。
上五味，以水七升，煮取三升，去滓，分温三服。
【桂枝加大黄汤方】即前方加大黄二两。
Taiyin disease patterns do not necessarily all arise from transmission from Shaoyang; occasionally, they may also be transmitted from Taiyang. However, transmission from Shaoyang represents the normal sequential progression of disease through the meridians, whereas transmission from Taiyang constitutes a "huai zheng" (bad complication or deteriorated syndrome resulting from mismanagement).
The original text of *Shanghan Lun* states: "Originally a Taiyang disease, if the physician erroneously applies purgation, leading to abdominal fullness and intermittent pain, it belongs to Taiyin; Guizhi Jia Shaoyao Tang (Cinnamon Twig Decoction with Added Peony) is the primary treatment. If there is severe pain with excess accumulation (da shi tong), Guizhi Jia Dahuang Tang (Cinnamon Twig Decoction with Added Rhubarb) is the primary treatment."
After erroneous purgation in a Taiyang disease, external pathogenic factors may indeed invade the Taiyin Spleen due to deficiency. Fundamentally, however, the Spleen Earth is suddenly injured by the downward-purging action, causing Liver Wood to exploit this weakness to overact upon Spleen Earth (Wood insulting Earth). The abdominal fullness and pain are essentially caused by disharmony and conflict between the Liver and Spleen. Guizhi (Cinnamon Twig) is originally a supreme herb for calming the Liver and harmonizing the Spleen (its aromatic fragrance awakens the Spleen, and its acrid-warm nature effectively opens Spleen stasis). When assisted by Shaoyao (Peony Root), Gancao (Licorice Root), Shengjiang (Fresh Ginger), and Dazao (Jujube Fruit)—all of which are substances that soften the Liver and support the Spleen—the Guizhi Tang (Cinnamon Twig Decoction) formula, if the instruction to drink hot porridge after administration is omitted, can serve as the correct medicine for treating Taiyin disease.
Regarding the original Taiyang syndrome, where erroneous purgation causes the pathology to sink into Taiyin, presenting with abdominal fullness and intermittent pain, the reason for doubling the dosage of Shaoyao (Peony Root) in the formula alone is that Shaoyao excels at treating abdominal pain. Observe Zhang Zhongjing’s use of Xiaochaihu Tang (Minor Bupleurum Decoction): when abdominal pain is present, Huangqin (Scutellaria Root) is removed and Shaoyao is added. Similarly, in Tongmai Sini Tang (Pulse-Reviving Four Reversals Decoction), when abdominal pain is present, Congbai (Scallion White) is removed and Shaoyao is added. These are clear evidences. If Shaoyao is used in equal proportion to Gancao, it forms Gancao Shaoyao Tang (Licorice and Peony Decoction), which was originally Zhang Zhongjing’s formula for restoring Yin. I have used it to treat sudden abdominal pain arising from exogenous miscellaneous diseases (provided one verifies that the pain is not cold-type), achieving immediate efficacy in every case. However, the dosage ratio where Shaoyao is double that of Gancao is most appropriate, as the combination of these two herbs possesses subtle synergistic effects, the intricacies of which are difficult to fully fathom. Moreover, using them together in this manner provides significant unblocking power, thereby not only treating abdominal pain but also eliminating abdominal fullness.
In this formula, although Shaoyao is doubled to six liang, Gancao remains at two liang, which seems insufficiently potent; thus, rapid efficacy might be difficult to achieve after administration. I propose increasing the dosage of Gancao to three liang, which should avoid any disadvantage of imbalance in medicinal properties.
[Guizhi Jia Shaoyao Tang Formula] Guizhi (Cinnamon Twig) 3 liang, Shaoyao (Peony Root) 6 liang, Gancao (Licorice Root) 2 liang (roasted), Shengjiang (Fresh Ginger) 3 liang (sliced), Dazao (Jujube Fruit) 12 pieces (split open).
Take the above five ingredients, add seven sheng of water, decoct to obtain three sheng of liquid, remove the dregs, and divide into three warm doses.
[Guizhi Jia Dahuang Tang Formula] This is the aforementioned formula with the addition of Dahuang (Rhubarb Root) 2 liang.