论曰小肠者，受盛之官，化物出焉，承奉胃司，受盛糟粕。受已复化传于大肠，是谓化
物而出也。其经有寒，则亦传于大肠，故化物难，而大肠中懊痛，便利赤白，脉经谓小肠寒
则令人下重便脓血者是也。
治小肠虚寒痛下赤白，肠滑后重。干姜黄连汤方
干姜（炮三两） 当归（切焙） 黄柏（去粗皮） 地榆（锉各四两） 黄连（去须） 阿
胶（炙令燥各二
上七味。粗捣筛，每服五钱匕。水一盏半，煎至一盏，去滓温服日三。
治小肠受寒，腹痛下重，便利脓血。浓朴散方
浓朴（去粗皮生姜汁炙锉） 黄连（去须微炒） 干姜炮 当归（切焙各一两） 白茯
苓（去黑皮） 无食子（各半两）
上六味。捣罗为细散，每服二钱匕，粥饮调下，食前服。
治小肠有寒，下利赤白，腹痛下重。木香汤方
木香（三分） 黄连（去须微炒） 当归（切微炒各一两） 附子（炮裂去皮脐一两半）
吴茱萸（汤洗七遍焙干炒半两） 浓朴（去粗皮生姜汁炙三两）
上六味。粗捣筛，每服三钱匕。以水一盏，煎至七分，去滓稍热服，食前。
治小肠寒，下利赤白。乌梅丸方
乌梅（一百枚） 干姜（炮） 黄连（去须各三两） 当归（切焙） 蜀椒（去目并闭
口者炒出汗） 细辛（去苗叶） 附子（炮裂去皮脐） 桂（去粗皮） 黄柏（去粗皮锉） 人
参（各一两）
上一十味。将九味捣罗为细末，以苦酒渍乌梅一宿，去核蒸令烂，别捣如泥，搅药匀，
更入炼蜜少许，和丸如梧桐子大。每服十丸至二十丸，米饮下，食前日三。
治小肠寒，便利赤白，肠滑。木香丸方
木香 黄连（去须） 诃子皮 无食子（各半两） 赤石脂（一两） 浓朴（去粗皮生
姜汁炙锉） 当归（切焙各三分）
上七味，捣罗为细末，炊枣肉和丸，如梧桐子大，每服二十丸，温米饮下，食前。
治小肠寒，肠中懊痛，下赤白。阿胶汤方
阿胶（炙燥二两） 桂（去粗皮） 生姜（切焙干各半两） 黄连（去须三分）
上四味。粗捣筛，每服五钱匕。水一盏半，煎至一盏，去滓稍热服，日三。
论述说：小肠是负责接受和盛纳食物的器官，食物在此处被消化转化并排出，它承接胃的功能，接受并盛纳糟粕。接受之后再次进行转化并传输到大肠，这叫做消化转化并排出。如果小肠的经脉受寒，寒气也会传导到大肠，因此导致食物难以消化转化，大肠中出现烦闷疼痛，排便带有红色和白色脓血，《脉经》中说小肠受寒会导致人出现肛门坠重、便下脓血的症状，正是这种情况。
治疗小肠虚寒引起的疼痛、下利赤白、肠道滑脱及肛门坠重感的干姜黄连汤方：
干姜（炮制三两） 当归（切后焙干） 黄柏（去除粗皮） 地榆（锉碎，各四两） 黄连（去除须根） 阿胶（炙烤至干燥，各二两）
以上七味药。粗捣筛碎，每次服用五钱匕。加水一盏半，煎煮至一盏，滤去药渣，温服，每日三次。
治疗小肠受寒，腹痛伴肛门坠重，排便脓血的浓朴散方：
浓朴（去除粗皮，用生姜汁炙烤后锉碎） 黄连（去除须根，微炒） 干姜（炮制） 当归（切后焙干，各一两） 白茯苓（去除黑皮） 无食子（各半两）
以上六味药。捣碎过筛成细粉，每次服用二钱匕，用粥饮调服，饭前服用。
治疗小肠有寒，下利赤白，腹痛伴肛门坠重的木香汤方：
木香（三分） 黄连（去除须根，微炒） 当归（切后微炒，各一两） 附子（炮裂后去皮脐，一两半） 吴茱萸（用水清洗七遍，焙干后炒，半两） 浓朴（去除粗皮，用生姜汁炙烤，三两）
以上六味药。粗捣筛碎，每次服用三钱匕。加水一盏，煎煮至七分，滤去药渣，稍热时服用，饭前服用。
治疗小肠受寒，下利赤白的乌梅丸方：
乌梅（一百枚） 干姜（炮制） 黄连（去除须根，各三两） 当归（切后焙干） 蜀椒（去除目及闭合口者，炒出油） 细辛（去除苗叶） 附子（炮裂后去皮脐） 桂枝（去除粗皮） 黄柏（去除粗皮锉碎） 人参（各一两）
以上十味药。将除乌梅外的九味药捣碎过筛成细末，用醋浸泡乌梅一夜，去核蒸烂，另捣成泥状，与药末搅拌均匀，再加入少许炼蜜，调和制成如梧桐子大小的丸剂。每次服用十丸至二十丸，米饮送服，饭前服用，每日三次。
治疗小肠受寒，排便赤白，肠道滑脱的木香丸方：
木香 黄连（去除须根） 诃子皮 无食子（各半两） 赤石脂（一两） 浓朴（去除粗皮，生用，生姜汁炙烤后锉碎） 当归（切后焙干，各三分）
以上七味药，捣碎过筛成细末，用蒸熟的枣肉调和制成丸剂，如梧桐子大小，每次服用二十丸，温米饮送服，饭前服用。
治疗小肠受寒，肠中烦闷疼痛，下利赤白的阿胶汤方：
阿胶（炙烤干燥，二两） 桂枝（去除粗皮） 生姜（切后焙干，各半两） 黄连（去除须根，三分）
以上四味药。粗捣筛碎，每次服用五钱匕。加水一盏半，煎煮至一盏，滤去药渣，稍热时服用，每日三次。
Commentary states: The Small Intestine is the official responsible for receiving and containing, where transformation of substances occurs. It receives instructions from the Stomach's function, accepting and containing dregs. After acceptance, it transforms again and transmits to the Large Intestine; this is called transforming substances and discharging them. If its meridian suffers from Cold, the pathogen also transmits to the Large Intestine, thus making the transformation of substances difficult, causing restlessness and pain in the Large Intestine, and discharge of red and white pus and blood. The *Mai Jing* (Pulse Classic) states that Cold in the Small Intestine causes a sensation of heaviness in the lower part and passage of pus and blood, which is exactly this condition.
Ganjiang Lianhuang Tang (Dry Ginger and Coptis Decoction) for treating deficiency-Cold pain of the Small Intestine, passage of red and white stool, intestinal slipping, and tenesmus.
Gan Jiang (Zingiberis Rhizoma Preparatum, processed, 3 liang) Dang Gui (Angelicae Sinensis Radix, sliced and baked) Huang Bo (Phellodendri Cortex, coarse skin removed) Di Yu (Sanguisorbae Radix, crushed, each 4 liang) Lian Zhu (Coptidis Rhizoma, mustache removed) E Jiao (Colla Corii Asini, roasted until dry, each 2 liang).
The above seven herbs are coarsely pounded and sieved. Each dose consists of 5 qian bi. Add 1.5 zhan of water, decoct until 1 zhan remains, remove the dregs, and take warm, three times daily.
Nongpu San (Magnolia Bark Powder) for treating Cold invasion of the Small Intestine, abdominal pain with tenesmus, and passage of pus and blood.
Hou Po (Magnoliae Officinalis Cortex, coarse skin removed, processed with ginger juice and crushed) Huang Lian (Coptidis Rhizoma, mustache removed, slightly stir-fried) Gan Jiang (Zingiberis Rhizoma, processed) Dang Gui (Angelicae Sinensis Radix, sliced and baked, each 1 liang) Bai Fu Ling (Poria, black skin removed) Wu Shi Zi (Terminalia chebula Retz., each 0.5 liang).
The above six herbs are pounded and sifted into fine powder. Each dose is 2 qian bi, taken with gruel drink before meals.
Muxiang Tang (Aucklandia Decoction) for treating Cold in the Small Intestine, passage of red and white diarrhea, abdominal pain, and tenesmus.
Mu Xiang (Aucklandiae Radix, 3 fen) Huang Lian (Coptidis Rhizoma, mustache removed, slightly stir-fried) Dang Gui (Angelicae Sinensis Radix, sliced and slightly stir-fried, each 1 liang) Fu Zi (Aconiti Lateralis Radix Preparata, cracked by processing, skin and navel removed, 1.5 liang) Wu Zhu Yu (Evodiae Fructus, washed seven times with water, baked dry and stir-fried, 0.5 liang) Hou Po (Magnoliae Officinalis Cortex, coarse skin removed, processed with ginger juice, 3 liang).
The above six herbs are coarsely pounded and sieved. Each dose is 3 qian bi. Add 1 zhan of water, decoct until 0.7 zhan remains, remove the dregs, and take slightly warm before meals.
Wumei Wan (Mume Pill) for treating Cold in the Small Intestine and passage of red and white diarrhea.
Wu Mei (Mume Fructus, 100 pieces) Gan Jiang (Zingiberis Rhizoma Preparata, processed) Huang Lian (Coptidis Rhizoma, mustache removed, each 3 liang) Dang Gui (Angelicae Sinensis Radix, sliced and baked) Shu Jiao (Zanthoxyli Pericarpium, remove eyes and closed ones, stir-fry until oil comes out) Xi Xin (Asari Radix et Rhizoma, remove seedlings and leaves) Fu Zi (Aconiti Lateralis Radix Preparata, cracked by processing, skin and navel removed) Gui Zhi (Cinnamomi Ramulus, coarse skin removed) Huang Bo (Phellodendri Cortex, coarse skin removed and crushed) Ren Shen (Ginseng Radix, each 1 liang).
The above ten herbs: Pound nine herbs (excluding Wu Mei) into fine powder. Soak Wu Mei in bitter vinegar overnight, remove pits, steam until soft, pound separately into paste, mix evenly with the powder, add a little refined honey, and form pills the size of wutong seeds. Take 10-20 pills per dose with rice drink before meals, three times daily.
Muxiang Wan (Aucklandia Pill) for treating Cold in the Small Intestine, passage of red and white stool, and intestinal slipping.
Mu Xiang (Aucklandiae Radix) Huang Lian (Coptidis Rhizoma, mustache removed) He Zi Pi (Terminalia Chebulae Pericarpium) Wu Shi Zi (Terminalia chebula Retz., each 0.5 liang) Chi Shi Zhi (Halloysit Rubrum, 1 liang) Hou Po (Magnoliae Officinalis Cortex, coarse skin removed, raw, processed with ginger juice and crushed) Dang Gui (Angelicae Sinensis Radix, sliced and baked, each 3 fen).
The above seven herbs are pounded and sifted into fine powder, mixed with steamed jujube flesh to form pills the size of wutong seeds. Take 20 pills per dose with warm rice drink before meals.
Ejiao Tang (Colla Corii Asini Decoction) for treating Cold in the Small Intestine, restlessness and pain in the intestines, and passage of red and white diarrhea.
E Jiao (Colla Corii Asini, roasted until dry, 2 liang) Gui Zhi (Cinnamomi Ramulus, coarse skin removed) Sheng Jiang (Zingiberis Rhizoma Recens, sliced and baked dry, each 0.5 liang) Huang Lian (Coptidis Rhizoma, mustache removed, 3 fen).
The above four herbs are coarsely pounded and sieved. Each dose is 5 qian bi. Add 1.5 zhan of water, decoct until 1 zhan remains, remove the dregs, and take slightly warm, three times daily.