论曰伤寒后香港脚者，缘其人肾经本虚，风湿毒瓦斯，乘虚客搏，肾主腰脚，故邪气沉滞，
则脚弱而痛，虽伤寒已瘥，邪热未尽，风湿毒瓦斯，与热相搏，上冲于心肺，其状令人心胸烦
满，上气息急，甚者致死，诊其脉左手尺脉洪而数者，香港脚也，服药后，脉沉而缓者愈。
治伤寒后香港脚上冲，心膈烦闷。羚羊角汤方
羚羊角（镑一两） 旋复花（三分） 茯苓（去黑皮一两） 黄芩（去黑心） 半夏（汤
洗七遍焙各三分） 槟榔（锉半两） 陈橘皮（汤浸去白焙三分） 吴茱萸（半两汤洗三遍
焙干炒）
上八味，粗捣筛，每服五钱匕，水一盏半，入生姜一分拍碎，同煎至七分，去滓食前温
服。
治伤寒后香港脚冲心，心神烦乱，呕逆减食，脚膝酸疼，紫苏木香汤方
紫苏茎叶（一两） 木香 赤茯苓（去黑皮各半两） 沉香 芍药 木通（锉各一两） 吴
茱萸（汤洗三遍焙干炒） 槟榔（锉） 陈橘皮（汤浸去白焙各一分）
上九味，粗捣筛，每服三钱匕，用水一盏，入生姜半分拍碎，同煎至七分，去滓食前温
服。
治伤寒后香港脚攻心闷绝。槟榔散方
槟榔（锉） 木香（各一两） 郁李仁（微炒去皮） 桂（去粗皮各三分） 吴茱萸（汤
洗三遍焙干炒半两） 赤茯苓去黑皮 牛膝去苗酒浸焙各三分
上七味，捣罗为细散，每服一钱半匕，食前煎桑根白皮木通汤调下，日二。
治伤寒后香港脚，胸中满闷，喘息促急。陈橘皮散方
陈橘皮（汤浸去白焙三分） 槟榔（锉一两） 桂（去粗皮三分） 牵牛子（微炒一两）
上四味，捣罗为细散，每服一钱半匕，食前温酒调下，日二。
治伤寒后香港脚攻心闷乱，腹满如石，小便赤涩。茯苓汤方
赤茯苓（去黑皮一两） 鳖甲（醋炙去裙 ） 木通（锉） 郁李仁（微炒去皮各三分）
上四味，粗捣筛，每服三钱匕，水一盏，煎至七分，去滓食前温服。
治伤寒后香港脚，心烦满闷，不下饮食，呕逆多痰。半夏汤方
半夏（汤洗七遍焙干） 枳壳（去瓤麸炒） 茯苓（去黑皮） 前胡（去芦头） 木通
（锉各三分）
上五味，粗捣筛，每服三钱匕，水一盏，入生姜一分拍碎，同煎至半盏，去滓食前温服
。
治伤寒后脚膝肿满气急，大便秘涩。赤小豆汤方
赤小豆（半合） 桑根白皮（半两） 紫苏茎叶（一两） 槟榔（半两）
上四味，锉三味如麻豆大，同小豆用水五盏，入生姜一分拍碎，煎至二盏半，去滓分两
服，食前温服。
治伤寒后香港脚，两胫肿满，心中烦闷。犀角散方
犀角（镑一两） 槟榔（锉半两） 陈橘皮（汤浸去白焙三分） 细辛（去苗叶半两） 吴
茱萸（汤洗三遍焙干炒一分）
上五味，捣罗为细散，每服一钱半匕，食前生姜热酒调下、日二。
治伤寒后香港脚，心腹妨闷胀痛，坐卧不安。吴茱萸散方
吴茱萸（汤洗三遍焙干炒一分） 槟榔（锉） 当归（切焙） 木香 郁李仁（微炒去
皮各
三分）
上五味，粗捣筛，每服三钱匕，用水一盏，煎至七分，去滓食前温服。
治伤寒后香港脚攻心腹胀硬，小便赤涩。大戟丸方
大戟（炒） 芫花（醋炒令焦） 苦葶苈（炒各半两） 续随子（去皮炒） 巴豆（去
皮心压去油尽别研各
上五味，捣罗四味为细末，入巴豆和研匀，炼蜜和丸，如梧桐子大，每服三丸至五丸，
温米饮下，不计时候。
论述：伤寒之后出现香港脚（一种以足胫肿重、软弱无力为主要表现的疾病），是因为患者肾经原本虚弱，风湿毒邪趁虚侵入并搏结于体内。肾主司腰部和脚部，因此邪气沉滞不去，导致脚部软弱且疼痛。虽然伤寒已经痊愈，但体内的邪热尚未清除干净，风湿毒邪与余热相互搏结，向上冲逆至心和肺，其症状表现为心胸烦闷胀满，呼吸急促上逆，严重时会导致死亡。诊察其脉象，若左手尺部脉象洪大而数，即为香港脚；服药后，若脉象转为沉而缓，则预示痊愈。
治疗伤寒后香港脚之气上冲，伴有心膈部烦闷的羚羊角汤方：
羚羊角（镑成薄片一两）、旋复花（三分）、茯苓（去除黑皮一两）、黄芩（去除黑心）、半夏（用热水洗七遍后焙干，各三分）、槟榔（锉碎半两）、陈橘皮（用水浸泡后去除白瓤焙干三分）、吴茱萸（半两，用水洗三遍后焙干炒制）。
以上八味药，粗捣筛过，每次服用五钱匕，加水一盏半，放入生姜一分拍碎，一同煎煮至七分量，去渣滓，饭前温服。
治疗伤寒后香港脚之气冲心，伴有心神烦乱、呕吐逆气、食欲减退、脚膝酸痛的紫苏木香汤方：
紫苏茎叶（一两）、木香、赤茯苓（去除黑皮，各半两）、沉香、芍药、木通（锉碎，各一两）、吴茱萸（用水洗三遍后焙干炒制）、槟榔（锉碎）、陈橘皮（用水浸泡后去除白瓤焙干，各一分）。
以上九味药，粗捣筛过，每次服用三钱匕，用水一盏，放入生姜半分拍碎，一同煎煮至七分量，去渣滓，饭前温服。
治疗伤寒后香港脚之气攻心导致胸闷欲绝的槟榔散方：
槟榔（锉碎）、木香（各一两）、郁李仁（微炒后去皮）、桂枝（去除粗皮，各三分）、吴茱萸（用水洗三遍后焙干炒制半两）、赤茯苓（去除黑皮）、牛膝（去除苗头，酒浸后焙干，各三分）。
以上七味药，捣碎研磨成细散，每次服用一钱半匕，饭前用桑根白皮和木通煎汤调服，每日两次。
治疗伤寒后香港脚，伴有胸中满闷、喘息急促的陈橘皮散方：
陈橘皮（用水浸泡后去除白瓤焙干三分）、槟榔（锉碎一两）、桂枝（去除粗皮三分）、牵牛子（微炒一两）。
以上四味药，捣碎研磨成细散，每次服用一钱半匕，饭前用温酒调服，每日两次。
治疗伤寒后香港脚之气攻心导致胸闷混乱，腹部胀满如石，小便赤红涩痛茯苓汤方：
赤茯苓（去除黑皮一两）、鳖甲（醋炙后去除裙边）、木通（锉碎）、郁李仁（微炒去皮，各三分）。
以上四味药，粗捣筛过，每次服用三钱匕，用水一盏，煎煮至七分量，去渣滓，饭前温服。
治疗伤寒后香港脚，伴有心烦满闷、无法进食、呕吐逆气且多痰的半夏汤方：
半夏（用水洗七遍后焙干）、枳壳（去除瓤麸炒）、茯苓（去除黑皮）、前胡（去除芦头）、木通（锉碎，各三分）。
以上五味药，粗捣筛过，每次服用三钱匕，用水一盏，放入生姜一分拍碎，一同煎煮至半盏量，去渣滓，饭前温服。
治疗伤寒后脚膝肿胀满闷、气急、大便秘结涩滞的赤小豆汤方：
赤小豆（半合）、桑根白皮（半两）、紫苏茎叶（一两）、槟榔（半两）。
以上四味药，将除赤小豆外的三味药锉碎如麻豆大小，同赤小豆一起用水五盏，放入生姜一分拍碎，煎煮至二盏半量，去渣滓，分两次服用，饭前温服。
治疗伤寒后香港脚，两小腿肿胀满闷，心中烦闷的犀角散方：
犀角（镑成薄片一两）、槟榔（锉碎半两）、陈橘皮（用水浸泡后去除白瓤焙干三分）、细辛（去除苗叶半两）、吴茱萸（用水洗三遍后焙干炒制一分）。
以上五味药，捣碎研磨成细散，每次服用一钱半匕，饭前用生姜热酒调服，每日两次。
治疗伤寒后香港脚，心腹部妨碍闷胀疼痛，坐卧不安的吴茱萸散方：
吴茱萸（用水洗三遍后焙干炒制一分）、槟榔（锉碎）、当归（切后焙干）、木香、郁李仁（微炒去皮，各三分）。
以上五味药，粗捣筛过，每次服用三钱匕，用水一盏，煎煮至七分量，去渣滓，饭前温服。
治疗伤寒后香港脚之气攻心导致腹胀坚硬，小便赤红涩痛的大戟丸方：
大戟（炒制）、芫花（醋炒至焦枯）、苦葶苈（炒制，各半两）、续随子（去皮炒制）、巴豆（去皮心，压榨去尽油后单独研细）。
以上五味药，将前四味药捣碎研磨成细末，加入巴豆混合研匀，用炼蜜调和制成丸药，大小如梧桐子，每次服用三丸至五丸，用温米饮送下，不限定具体时间。
Commentary: Hongjiao (a disease characterized by swelling and weakness of the lower legs and feet) occurring after Shanghan (Cold Damage) arises because the patient's Kidney Meridian is originally deficient. Wind-dampness and toxic qi take advantage of this deficiency to invade and contend within the body. The Kidney governs the waist and feet; therefore, when pathogenic factors stagnate deeply, it results in weak and painful feet. Although the Shanghan has subsided, residual pathogenic heat remains. The wind-dampness and toxic qi contend with this heat, rushing upward to affect the Heart and Lungs. The clinical presentation includes vexation, fullness, and oppression in the chest and heart region, along with rapid and difficult breathing. In severe cases, this can lead to death. Upon pulse diagnosis, if the left Chi (Cun Kou) pulse is surging (Hong) and rapid (Shu), it indicates Hongjiao. After administering medication, if the pulse becomes deep (Chen) and slow (Huan), recovery is indicated.
Lingyang Jiao Tang (Antelope Horn Decoction) for treating Hongjiao after Shanghan with Qi rushing upward, accompanied by vexation and oppression in the chest and diaphragm.
Ingredients: Lingyang Jiao (Antelope Horn, 1 liang, shaved into flakes), Xuan Fu Hua (Inula Flower, 3 fen), Fuling (Poria, 1 liang, black skin removed), Huang Qin (Scutellaria Root, black center removed), Banxia (Pinellia Tuber, washed seven times with hot water and dried, 3 fen each), Binglang (Areca Seed, crushed, 0.5 liang), Chen Ju Pi (Aged Tangerine Peel, soaked in water, white pith removed, dried, 3 fen), Wuzhuyu (Evodia Fruit, 0.5 liang, washed three times with water, dried, and stir-fried).
Preparation: Coarsely crush and sieve the eight herbs. For each dose, use 5 qian bi (approx. 15g). Add 1.5 zhan (approx. 300ml) of water and 1 fen (approx. 3g) of crushed fresh ginger. Decoct until reduced to 0.7 zhan. Strain and take warm before meals.
Zisu Muxiang Tang (Perilla Stem-Leaf and Costus Root Decoction) for treating Hongjiao after Shanghan with Qi rushing to the Heart, accompanied by mental restlessness, nausea, vomiting, loss of appetite, and soreness/pain in the feet and knees.
Ingredients: Zisu Jing Ye (Perilla Stem-Leaf, 1 liang), Muxiang (Costus Root), Chi Fuling (Red Poria, 0.5 liang each, black skin removed), Chenxiang (Aquilaria Wood), Shaoyao (Peony Root), Mutong (Akebia Stem, 1 liang each, crushed), Wuzhuyu (Evodia Fruit, washed three times with water, dried, and stir-fried), Binglang (Areca Seed, crushed), Chen Ju Pi (Aged Tangerine Peel, soaked in water, white pith removed, dried, 1 fen each).
Preparation: Coarsely crush and sieve the nine herbs. For each dose, use 3 qian bi (approx. 9g). Add 1 zhan (approx. 200ml) of water and 0.5 fen (approx. 1.5g) of crushed fresh ginger. Decoct until reduced to 0.7 zhan. Strain and take warm before meals.
Binglang San (Areca Seed Powder) for treating Hongjiao after Shanghan with Qi attacking the Heart, causing severe chest tightness and near-syncope.
Ingredients: Binglang (Areca Seed, crushed), Muxiang (Costus Root, 1 liang each), Yuliren (Bush Cherry Pit, slightly stir-fried and skin removed), Gui (Cinnamon Twig, 3 fen each, rough bark removed), Wuzhuyu (Evodia Fruit, 0.5 liang, washed three times with water, dried, and stir-fried), Chi Fuling (Red Poria, black skin removed), Niuxi (Achyranthes Root, 3 fen each, seedlings removed, wine-soaked, and dried).
Preparation: Crush and grind the seven herbs into a fine powder. For each dose, use 1.5 qian bi (approx. 4.5g). Take before meals, mixed with decoction of Sanggen Baipi (Morus Root Bark) and Mutong (Akebia Stem). Administer twice daily.
Chen Ju Pi San (Aged Tangerine Peel Powder) for treating Hongjiao after Shanghan, accompanied by chest fullness, oppression, and rapid panting.
Ingredients: Chen Ju Pi (Aged Tangerine Peel, 3 fen, soaked in water, white pith removed, dried), Binglang (Areca Seed, 1 liang, crushed), Gui (Cinnamon Twig, 3 fen, rough bark removed), Qianniu Zi (Pharbitis Seed, 1 liang, slightly stir-fried).
Preparation: Crush and grind the four herbs into a fine powder. For each dose, use 1.5 qian bi (approx. 4.5g). Take before meals, mixed with warm wine. Administer twice daily.
Fuling Tang (Poria Decoction) for treating Hongjiao after Shanghan with Qi attacking the Heart, causing mental confusion, abdominal distension hard as stone, and red, scanty, or painful urination.
Ingredients: Chi Fuling (Red Poria, 1 liang, black skin removed), Biejia (Turtle Shell, vinegar-roasted and skirt removed), Mutong (Akebia Stem, crushed), Yuliren (Bush Cherry Pit, 3 fen each, slightly stir-fried and skin removed).
Preparation: Coarsely crush and sieve the four herbs. For each dose, use 3 qian bi (approx. 9g). Add 1 zhan (approx. 200ml) of water. Decoct until reduced to 0.7 zhan. Strain and take warm before meals.
Banxia Tang (Pinellia Decoction) for treating Hongjiao after Shanghan, accompanied by mental vexation, fullness, inability to eat, nausea, vomiting, and excessive phlegm.
Ingredients: Banxia (Pinellia Tuber, washed seven times with water and dried), Zhike (Bitter Orange, pulp removed, bran-roasted), Fuling (Poria, black skin removed), Qianhu (Peucedanum Root, radicle removed), Mutong (Akebia Stem, 3 fen each, crushed).
Preparation: Coarsely crush and sieve the five herbs. For each dose, use 3 qian bi (approx. 9g). Add 1 zhan (approx. 200ml) of water and 1 fen (approx. 3g) of crushed fresh ginger. Decoct until reduced to 0.5 zhan. Strain and take warm before meals.
Chixiaodou Tang (Adzuki Bean Decoction) for treating Hongjiao after Shanghan with swollen and full feet/knees, shortness of breath, and dry, difficult defecation.
Ingredients: Chixiaodou (Adzuki Bean, 0.5 he), Sanggen Baipi (Morus Root Bark, 0.5 liang), Zisu Jing Ye (Perilla Stem-Leaf, 1 liang), Binglang (Areca Seed, 0.5 liang).
Preparation: Chop the three herbs (excluding Adzuki Beans) to the size of hemp seeds. Combine with Adzuki Beans and 5 zhan (approx. 1000ml) of water. Add 1 fen (approx. 3g) of crushed fresh ginger. Decoct until reduced to 2.5 zhan. Strain and divide into two doses. Take warm before meals.
Xijiao San (Rhinoceros Horn Powder) for treating Hongjiao after Shanghan with swelling and fullness in both shins, and mental vexation.
Ingredients: Xijiao (Rhinoceros Horn, 1 liang, shaved into flakes), Binglang (Areca Seed, 0.5 liang, crushed), Chen Ju Pi (Aged Tangerine Peel, 3 fen, soaked in water, white pith removed, dried), Xixin (Asarum Root, 0.5 liang, seedlings and leaves removed), Wuzhuyu (Evodia Fruit, 1 fen, washed three times with water, dried, and stir-fried).
Preparation: Crush and grind the five herbs into a fine powder. For each dose, use 1.5 qian bi (approx. 4.5g). Take before meals, mixed with hot wine containing fresh ginger. Administer twice daily.
Wuzhuyu San (Evodia Fruit Powder) for treating Hongjiao after Shanghan with chest/abdominal obstruction, fullness, distension, and pain, causing restlessness in sitting and lying down.
Ingredients: Wuzhuyu (Evodia Fruit, 1 fen, washed three times with water, dried, and stir-fried), Binglang (Areca Seed, crushed), Danggui (Angelica Sinensis Root, sliced and dried), Muxiang (Costus Root), Yuliren (Bush Cherry Pit, 3 fen each, slightly stir-fried and skin removed).
Preparation: Coarsely crush and sieve the five herbs. For each dose, use 3 qian bi (approx. 9g). Add 1 zhan (approx. 200ml) of water. Decoct until reduced to 0.7 zhan. Strain and take warm before meals.
Daji Wan (Kansui Pill) for treating Hongjiao after Shanghan with Qi attacking the Heart, causing abdominal distension and hardness, and red, scanty, or painful urination.
Ingredients: Daji (Euphorbia Root, stir-fried), Yuanhua (Genkwa Flower, vinegar-roasted until scorched), Kutingli (Descurainia Seed, stir-fried, 0.5 liang each), Suisui Zi (Croton Seed, peeled and stir-fried), Badou (Croton Seed, husk and heart removed, oil pressed out completely, separately ground).
Preparation: Grind the first four herbs into a fine powder. Mix with the processed Badou. Bind with refined honey to form pills the size of Sophora seeds. For each dose, take 3 to 5 pills. Swallow with warm rice drink. Time of administration is not restricted.