〔补大肠猛将〕淫羊藿、罂粟壳〔次将〕诃子肉、百合
〔泻大肠猛将〕大黄、桃仁、雷丸、麻仁、升麻、紫草〔次将〕秦艽、旋复花、郁李仁、
杏仁、大腹皮、白芷、梨汁
〔凉大肠猛将〕黄芩、黄柏〔次将〕地榆、槐实、知母、连翘
〔温大肠猛将〕胡椒、破故纸、枸杞〔次将〕当归
千金牡丹皮散 治肠痈。
丹皮 苡仁（各五钱） 栝蒌仁（一钱五分） 桃仁（十二粒研）
水煎服。如大便闭。加大黄钱半。当归三钱。
鸦胆子方 治久痢。寒积在肠。
用鸦胆子一个蒸透。将米粉包作团子蒸熟。以开水囫囵吞下。空心服。
清魂散 治肠风下鲜血。而腹不痛者。
荆芥（炒黑三钱） 当归（五钱）
十全大补汤 补中益气汤 附子理中汤 小承气汤（以上诸方俱见卷一） 归脾汤（见心
部） 芍药甘草汤（见肝部） 三黄解毒汤（见胃部）
（手太阳属腑）
小肠者。受盛之官。化物出焉。其上口即胃下口。水谷由此而入。其下口即大肠上口。此处泌
别清浊。俾水液注入膀胱。滓秽流入大肠。是腑中之有鉴别者。故与心相表里。脉附于膀胱
而在左尺。小肠无表症。皆属于里。
小肠虚。左尺脉必细软。其症为溺赤短。为腰痛。
溺赤短者。水不胜火也。生地黄汤主之。腰痛者。水不足也。六味地黄丸主之。
小肠实。左尺脉必洪弦。其症为小肠气。为交肠。
小肠气者。气滞下焦。脐下转痛。失气则快也。橘核丸主之。交肠者。阴阳拂逆。大小
肠交也。五苓散主之。
小肠寒。左尺脉必迟。其症为咳嗽失气。
咳嗽失气者。小肠嗽也。止嗽散加芍药主之。
小肠热。左尺脉必数。其症为溺涩溺短。
溺涩溺短者。湿热壅滞也。导赤散主之。
【补益大肠的猛将】淫羊藿、罂粟壳；【次将】诃子肉、百合。
【泻下大肠的猛将】大黄、桃仁、雷丸、火麻仁、升麻、紫草；【次将】秦艽、旋覆花、郁李仁、杏仁、大腹皮、白芷、梨汁。
【凉血清热大肠的猛将】黄芩、黄柏；【次将】地榆、槐实、知母、连翘。
【温里散寒大肠的猛将】胡椒、补骨脂、枸杞；【次将】当归。
千金牡丹皮散：治疗肠痈（肠道化脓性炎症）。
组成：丹皮、薏苡仁（各五钱），瓜蒌仁（一钱五分），桃仁（十二粒，研碎）。
用法：水煎服。如果大便闭塞不通，加大黄一钱半，当归三钱。
鸦胆子方：治疗久痢（慢性痢疾）。病机为寒邪积滞在肠道。
用法：取鸦胆子一枚，蒸透后，用米粉包裹做成团子蒸熟，空腹时整颗吞服。
清魂散：治疗肠风下鲜血（便血），且腹部不疼痛者。
组成：荆芥（炒黑三钱）、当归（五钱）。
十全大补汤、补中益气汤、附子理中汤、小承气汤（以上各方均见本书卷一）；归脾汤（见心脏部）；芍药甘草汤（见肝脏部）；三黄解毒汤（见胃部）。
（手太阳小肠经属于腑器）
小肠是受盛之官，负责消化食物并排出糟粕。其上口连接胃的下口，饮食水谷由此进入；其下口连接大肠的上口，此处分别清浊，使水液注入膀胱，糟秽流入大肠。这是腑器中具有鉴别功能的一个。因此，它与心相表里。脉象附着于膀胱，位于左尺部。小肠没有表证，所有病症都属于里证。
小肠虚证：左尺脉必然细软。症状表现为小便赤短、腰痛。
小便赤短，是因为水不能制约火。主方为生地黄汤。
腰痛，是因为肾水不足。主方为六味地黄丸。
小肠实证：左尺脉必然洪大弦急。症状表现为小肠气痛、交肠病。
所谓“小肠气”，是指气滞在下焦，脐下转动疼痛，排气后感到舒畅。主方为橘核丸。
所谓“交肠”，是指阴阳逆乱，大小肠功能交错混乱。主方为五苓散。
[Generous Tonifying Generals for the Large Intestine] Epimedium Herba (Yinyanghuo), Pericarpium Papaveris (Yingsuke); [Secondary Generals] Fructus Terminaliae Chebulae (Hezi Rou), Bulbus Lilii (Baihe).
[Generous Purging Generals for the Large Intestine] Radix et Rhizoma Rhei (Dahuang), Semen Persicae (Taoren), Ascaris Lumbricoides (Leiwuan), Semen Cannabis Sativae (Maren), Radix Bupleuri (Shengma), Radix Arnebiae seu Lithospermi (Zicao); [Secondary Generals] Radix Gentianae Macrophyllae (Qinjiao), Flos Inulae (Xuanjinhua), Semen Pruni Mume (Yuliren), Semen Armeniacae Amarum (Xingren), Pericarpium Arecae (Dafupi), Radix Angelicae Dahuricae (Baizhi),汁 Pirus Communis (Lizhi).
[Generous Cooling Generals for the Large Intestine] Radix Scutellariae (Huangqin), Cortex Phellodendri (Huangbai); [Secondary Generals] Radix Sanguisorbae (Diyu), Fructus Sophorae (Huaishi), Radix Anemarrhenae (Zhimu), Flos Forsythiae (Lianqiao).
[Generous Warming Generals for the Large Intestine] Piperis Fructus (Hujiao), Fructus Psoraleae (Poguzhi), Fructus Lycii (Gouqi); [Secondary General] Radix Angelicae Sinensis (Danggui).
Qianjin Mudanpi San (Thousand Gold Peony Bark Powder): Treats Changyong (Intestinal Abscess).
Ingredients: Radix Moutan (Danpi), Semen Coicis (Yiren) (each 5 qian), Semen Trichosanthis (Gualou Ren) (1.5 qian), Semen Persicae (Taoren) (12 grains, crushed).
Usage: Decoct in water and take orally. If there is fecal impaction, add Radix et Rhizoma Rhei (Dahuang) 1.5 qian and Radix Angelicae Sinensis (Danggui) 3 qian.
Yadanzi Fang (Brucea Javanica Formula): Treats Jiuli (Chronic Dysentery). The pathogenesis involves cold accumulation in the intestines.
Usage: Take one fruit of Brucea Javanica (Yadanzi), steam until thoroughly cooked, wrap it in rice flour to form a dumpling, steam again until cooked, and swallow whole with warm water on an empty stomach.
Qinghun San (Clear Soul Powder): Treats Changfeng Xia Xianxue (Bright red blood in stool due to Wind in the Intestines) where there is no abdominal pain.
Ingredients: Folium Schizonepetae (Jingjie) (charred black, 3 qian), Radix Angelicae Sinensis (Danggui) (5 qian).
Shiquan Dabu Tang (Ten Substance Great Tonifying Decoction), Buzhong Yiqi Tang (Tonify the Middle and Augment Qi Decoction), Fuzi Lizhong Tang (Aconite Regulate the Middle Decoction), Xiao Chengqi Tang (Minor Order the Qi Decoction) (all aforementioned formulas are found in Volume I); Guipi Tang (Restore the Spleen Decoction) (see Heart Section); Shaoyao Gancao Tang (Peony and Licorice Decoction) (see Liver Section); Sanhuang Jiedu Tang (Three Yellows Detoxification Decoction) (see Stomach Section).
(The Hand-Taiyang Small Intestine belongs to the Fu organs)
The Small Intestine is the Official of Reception and Transformation, responsible for processing food and separating clear from turbid. Its upper orifice connects to the lower orifice of the Stomach, through which food and drink enter. Its lower orifice connects to the upper orifice of the Large Intestine. Here, clear and turbid substances are separated, allowing fluids to flow into the Bladder and waste matter to flow into the Large Intestine. It is the only Fu organ that possesses this function of discrimination. Therefore, it has an exterior-interior relationship with the Heart. Its pulse is associated with the Bladder and located at the left Chi position. The Small Intestine has no Exterior syndromes; all its conditions belong to the Interior.
Small Intestine Deficiency: The left Chi pulse must be fine and soft. Symptoms include dark and scanty urination and lower back pain.
Dark and scanty urination indicates that Water fails to control Fire. The primary formula is Shengdi Huang Tang (Rehmannia Root Decoction).
Lower back pain indicates insufficiency of Kidney Water. The primary formula is Liuwei Dihuang Wan (Six-Ingredient Rehmannia Pill).
Small Intestine Excess: The left Chi pulse must be surging and wiry. Symptoms include Xiao Chang Qi (Small Intestine Qi stagnation) and Jiao Chang (Crossed Intestines syndrome).
"Xiao Chang Qi" refers to Qi stagnation in the Lower Jiao, causing twisting pain below the umbilicus, which feels relieved after passing gas. The primary formula is Juhe Wan (Tangerine Seed Pill).
"Jiao Chang" refers to the reversal of Yin and Yang, resulting in the confusion of functions between the Large and Small Intestines. The primary formula is Wu Ling San (Five-Ingredient Powder with Poria).
Small Intestine Cold: The left Chi pulse must be slow. Symptoms include cough and passing gas.
Cough accompanied by passing gas is considered "Small Intestine Cough." The primary formula is Zhisou San (Stop Cough Powder) added with Radix Paeoniae Alba (Shaoyao).
Small Intestine Heat: The left Chi pulse must be rapid. Symptoms include dysuria and scanty urine.
Dysuria and scanty urine indicate damp-heat congestion. The primary formula is Daochi San (Guide Out Redness Powder).