香港脚者，足履地而受寒暑风湿之气，致成此证也。其初从足起，渐入小腹，甚乃上攻心胸，若
不急治，遂至杀人。然其证有干湿之不同，湿香港脚者，两脚肿大，或下注生疮，浸淫滋水，以鸡鸣散
主之。干香港脚者，两胫不肿，或顽麻，或挛急，或纵缓，为血虚而兼湿气，以四物汤加味主之。如脚
气疼痛，不可屈伸者，以乌头汤主之。若上气喘急，及小腹不仁，恐攻心不
救者，以肾气丸主之。如香港脚冲心者，以矾石汤浸之。
鸡鸣散
槟榔（七粒） 吴茱萸（三钱泡） 苏叶（三钱） 桔梗（五钱） 橘红（一两）
木瓜（三两） 生姜（五钱） 水三大碗，煎至一小碗，取汁；再入水二碗，煎取一小碗，取汁；
两汁相和，次日五更，分三五次，冷服之。冬月略温亦可，天明当下黑粪。
四物加味汤
熟地（三钱） 当归（三钱） 川芎（一钱半） 白芍（二钱酒炒） 牛膝（二钱）
独活（二钱） 苍术（一钱） 泽泻（三钱） 水煎大半杯，温服。热者，加黄柏、知母、茵陈。寒者，
加干姜、附子、吴茱萸、肉桂之类。
乌头汤
麻黄（三钱） 芍药（三钱） 黄 （三钱） 甘草（二钱炙） 乌头（三钱）
上将乌头 咀，用蜜一杯，煎取五分，即出乌头。另四味，以水三杯，煎取一杯，去渣。纳蜜，
再煎八分，温服。用茵陈五苓汤，亦效。
肾气丸
熟地（八两） 山萸肉（四两） 山药（四两） 丹皮（三两） 茯苓（三两）
泽泻（三两） 附子（一两） 肉桂（一两） 炼蜜为丸，如桐子大。每服三钱，淡盐汤送下。
矾石汤
矾石（三两） 水煎三五沸，浸脚良。
Hong Kong foot disease (Jiaoqi) arises from the feet contacting the ground and being invaded by cold, summer-heat, wind, and dampness pathogens. It initially starts in the feet, gradually ascending to the lower abdomen, and in severe cases, attacks the heart and chest. If not treated promptly, it can be fatal. However, this condition is categorized into dry and wet types. In wet Hong Kong foot, both feet are swollen, or sores form with oozing fluid; Ji Ming San (Cockcrow Decoction) is the primary formula. In dry Hong Kong foot, the calves are not swollen but may present with numbness, stiffness, spasms, or flaccidity; this is due to blood deficiency combined with dampness, treated primarily with Si Wu Tang (Four Substances Decoction) modified. For Jiaoqi pain causing inability to flex or extend the joints, Wu Tou Tang (Aconite Decoction) is used. If there is wheezing and shortness of breath, along with insensibility in the lower abdomen, suggesting impending cardiac attack which may be incurable, Shen Qi Wan (Kidney Qi Pill) is indicated. For Hong Kong foot attacking the heart, Fan Shi Tang (Alum Decoction) is used for foot soaking.
Ji Ming San (Cockcrow Decoction)
Areca Seed (7 grains) Evodia Fruit (3 qian, soaked) Perilla Leaf (3 qian) Platycodon Root (5 qian) Tangerine Peel (1 liang) Chaenomeles Fruit (3 liang) Fresh Ginger (5 qian)
Boil in 3 large bowls of water until reduced to 1 small bowl; extract the juice. Add 2 bowls of water, boil again until reduced to 1 small bowl; extract the juice. Mix both juices. On the following day at the fifth watch (around 3–5 AM), take in 3–5 doses, cold. In winter, slightly warm administration is acceptable. Black stool should be passed after dawn.
Si Wu Modified Decoction (Four Substances Decoction Modified)
Prepared Rehmannia Root (3 qian) Angelica Sinensis Root (3 qian) Szechuan Lovage Rhizome (1.5 qian) White Peony Root (2 qian, stir-fried with wine) Achyranthes Bidentata Root (2 qian) Notopterygium Rhizome (2 qian) Atractylodes Rhizome (1 qian) Alisma Rhizome (3 qian)
Decoct in water to obtain half a cup; take warm. For heat patterns, add Phellodendron Bark, Anemarrhena Rhizome, and Yarrow Herb. For cold patterns, add Dried Ginger, Prepared Aconite Root, Evodia Fruit, and Cinnamon Bark.
Wu Tou Tang (Aconite Decoction)
Ephedra Stem (3 qian) Peony Root (3 qian) Astragalus Root (3 qian) Licorice Root (2 qian, honey-fried) Aconite Lateral Root (3 qian)
First, crush the Aconite Lateral Root. Boil with one cup of honey until reduced to five fen; remove the Aconite. Decoct the other four herbs in three cups of water until reduced to one cup; strain. Add the honey decoction, boil again until reduced to eight fen; take warm. Yin Chen Wu Ling Tang (Artemisia Capillaris and Five-Ingredient Powder with Poria Decoction) is also effective.
Shen Qi Wan (Kidney Qi Pill)
Prepared Rehmannia Root (8 liang) Cornus Fruit (4 liang) Chinese Yam (4 liang) Moutan Cortex (3 liang) Poria (3 liang) Alisma Rhizome (3 liang) Prepared Aconite Root (1 liang) Cinnamon Bark (1 liang)
Process refined honey into pills the size of paulownia seeds. Take 3 qian per dose, washed down with light salt water.
Fan Shi Tang (Alum Decoction)
Alum (3 liang)
Decoct in water for 3–5 boils; soak the feet. This is beneficial.