吞酸因胃中湿热，郁遏肝火所致。盖湿郁则热，热郁则酸；以酸为肝木之味，故责之肝火，宜逍遥
散加减，合左金丸治之。其有因伤食吞酸，因痰饮吐酸者，以消食消痰为主，亦合左金丸治之。若老弱
人，久患吞酸，则津液耗散，渐成嗝症。又有老人胃气虚弱，口吐酸水不止者，宜补胃气
为主。嘈杂、俗谓心嘈，火症也，而痰次之。终岁嘈杂者，必夭天年，盖 万物者，莫甚乎火也。若老
人嘈杂不止，亦为嗝症之渐。仲淳以吞酸嘈杂，俱责之胃火所致。治宜清热降火，略兼消导为主。
左全丸〔见胁痛。〕
或合逍遥散加减。如老人胃气虚弱，口吐酸水不止者，本方合异功散。如因伤食吞酸，合保和汤。
如因痰饮吐酸，合二陈，加苍术、泽泻。
此治吞酸之神方也。凡治酸必少加吴茱萸，以为反佐者，因其性而拆之也。
清胃汤〔自制。〕
石斛 麦冬 芦根汁〔清胃。〕黄连〔吴茱拌炒。〕连翘〔降火。〕山楂 麦冬 橘
红〔消导。〕加竹叶，热多加石膏、青黛之属。 口臭口淡〔皆属胃热。〕亦用本方去楂、芽、橘红。
此清胃热而兼消导之剂，宗仲淳法以治吞酸嘈杂也。刘氏谓嘈杂宜分有余不足而治之。脾胃虚火嘈杂，
得食则止者，宜资生丸。如气有余，久郁化火，火郁生痰，痰因火动而嘈杂者，二陈汤加黄连、山栀。肥
人多湿痰者，方施之恰当。
Dyspepsia with acid regurgitation is caused by damp-heat in the stomach, which stagnates and suppresses Liver Fire. Dampness stagnation generates heat, and heat stagnation produces sourness; since sourness is the flavor associated with Wood of the Liver, the pathology is attributed to Liver Fire. The appropriate treatment involves modifying Xiaoyao San (Free and Easy Wanderer Powder) combined with Zuojin Wan (Left Metal Pill). In cases where acid regurgitation is due to food stagnation or vomiting of acid due to phlegm-fluid retention, the primary treatment should focus on resolving food stagnation and transforming phlegm, also combined with Zuojin Wan. If elderly or weak individuals suffer from chronic acid regurgitation, their body fluids will be depleted, gradually evolving into a condition of dysphagia and obstruction (Ge Zheng). Additionally, for elderly people with deficient Stomach Qi who continuously vomit acid water, the main treatment should be to tonify Stomach Qi.
Zaot (Restlessness in the epigastrium), commonly known as "heart restlessness," belongs to Fire syndromes, with Phlegm being secondary. Those suffering from Zaot throughout the year are destined to die prematurely, as nothing is more intense than Fire among all things. If an elderly person suffers from persistent Zaot, it is also a precursor to Ge Zheng. Zhongchun attributed both acid regurgitation and Zaot to Stomach Fire. The treatment should prioritize clearing heat and descending fire, with slight addition of methods to resolve stagnation.
Zuojin Wan [See Hypochondriac Pain]. Alternatively, combine with modified Xiaoyao San. For elderly patients with deficient Stomach Qi and continuous vomiting of acid water, combine this formula with Yigong San. If acid regurgitation is due to food stagnation, combine with Baohe Tang. If vomiting of acid is due to phlegm-fluid retention, combine with Erchen Tang, adding Cang Zhu (Atractylodis Rhizoma) and Ze Xie (Alismatis Rhizoma). This is a miraculous formula for treating acid regurgitation. In all treatments for acidity, a small amount of Wu Zhu Yu (Evodiae Fructus) must be added as a counter-agent (fan zuo), utilizing its nature to disperse the pathogen.
Qingwei Decoction [Self-made]. Shi Hu (Dendrobii Caulis), Mai Dong (Ophiopogonis Radix), Lu Gen Zhi (Reed Rhizome Juice) [to clear Stomach heat], Huang Lian (Coptidis Rhizoma) [stir-fried with Wu Zhu Yu], Lian Qiao (Forsythiae Fructus) [to descend fire], Shan Zha (Crataegi Fructus), Mai Dong (Ophiopogonis Radix), Ju Hong (Citri Reticulatae Pericarpium Rubrum) [to resolve stagnation]. Add Zhu Ye (Bambusae Folium); if heat is severe, add more Shi Gao (Gypsum Fibrosum) and Qing Dai (Indigo Naturalis). Bad breath or insipid taste [both belong to Stomach Heat] can also be treated with this formula, removing Shan Zha, Ya (Hordei Fructus Germinatus), and Ju Hong. This is a formula that clears Stomach Heat while resolving stagnation, following Zhongchun's method to treat acid regurgitation and Zaot. Mr. Liu stated that Zaot should be treated by distinguishing between excess and deficiency. For Zaot caused by deficient Fire of the Spleen and Stomach, which stops upon eating, Zisheng Wan is appropriate. If there is excess Qi, long-term stagnation transforms into Fire, Fire stagnation generates Phlegm, and Phlegm moves due to Fire causing Zaot, use Erchen Tang added with Huang Lian (Coptidis Rhizoma) and Shan Zhi (Gardeniae Fructus). This prescription is particularly suitable for obese individuals with damp-phlegm.