香港脚之病，盖由有寒湿之胜，故经于太阴之胜，言足胫腑肿，于太阳之胜，言至引阴股
筋肉拘苛，又言，岁土太过，甚则肌肉萎，足痿不收，行善螈，脚下痛，饮发中满，四肢
举，此寒湿之气所成也，然天下之病，固有似是而非，本异而标同，用药过差，则利害相反，
若香港脚之病，本于寒湿之胜，而至于肺热，而病生于足胃热而风生于足，与香港脚相似，
热殊状，试别而明之，热而足痛者，以肺经之所行也，故经言，岁金太过，则股髀 足皆
病焉，胃热而足病者，抑以宗筋不行，而传为痿厥也。
今有人病足痛，得水土寒湿之状，六脉沉伏而动，上浊下虚，尺泽微而涩，宜暖其下，
用此方。
牛膝（半两） 黄 （半两） 独活 当归
麻（炮） 大芎 续断（各十铢） 细辛
上为末，薏苡粉煮作稀糊，丸如梧子大，空心服五七十丸，温酒或盐汤下。
肺乘热而足病，则左手一手脉全微而细左尺又小，搏击而沉，右手脉偏，有骨力，洪大
，而肺脉尤甚，再寻。虚弦而长，用修崔氏紫苏方服之，盖世人多以崔氏方治香港脚而得效，
不知此方只可治肺热脚痛耳。
紫苏子 芍药 官桂 茵芋 茯苓 大腹皮 桔梗 甘草（炙，各一分）
麻黄（去节，一两） 黄 （半两）
上为粗散，生姜一片，煎三钱，以为饮服。
胃热而宗筋不润，则脚弱无力，两足酸软，或带微肿，诊其脉，胃脉一指弦而长，又微
带疾，六脉差大，宜用此方。
大腹皮（半两） 茵芋（八铢） 杏仁（去尖） 茯苓
薏苡仁（各一分） 青橘皮（四铢） 芎（十铢）
上为粗散，非时，姜煎，仍以前暖肾药，壮元气药，相兼而进，若服此药，大府微利
，即住此，却进补药两三日，待定帖，仍进此药。
香港脚这一病症，大概是由于寒湿之气偏胜所致，所以《内经》在论述太阴经气偏胜时，提到足胫部浮肿；在论述太阳经气偏胜时，提到牵引至阴股部位，筋肉拘急僵硬。又提到，若岁运土气太过，严重时会出现肌肉萎缩、足部痿软无力不能收持、行走时容易抽搐、脚下疼痛、饮水后中焦胀满、四肢浮肿，这些都是由寒湿之气所形成的。然而天下的疾病，确实存在表面相似而实质不同、本源各异但表象相同的情况，如果用药出现偏差，那么疗效与危害就会截然相反。
例如香港脚之病，其本源是寒湿偏胜，但若发展至肺热阶段，或者病因生于足胃之热而风邪生于足部，这些病症与香港脚相似，但热象表现殊异，需要辨别清楚并加以说明。若是热邪导致足痛，这是手太阴肺经所循行的部位，所以《内经》说，若岁运金气太过，则大腿、髀部及足部都会患病。若是胃热导致足部疾病，则是由于宗筋功能失常，进而传变为痿厥证。
现在有人患足痛，呈现出水土寒湿的征状，六脉沉伏且跳动有力，上部脉象浊滞而下部脉象虚弱，尺泽穴处脉象微细而涩，适宜温暖下部，使用此方。
牛膝（半两） 黄芪（半两） 独活 当归 麻黄（炮制） 大川芎 续断（各十铢） 细辛
以上药物研为细末，用薏苡粉煮成稀糊状，制成梧桐子大小的丸药，空腹服用五七十丸，用温酒或盐汤送服。
若是肺经乘热而导致足部疾病，则左手脉象整体微弱而细，左尺脉又小，搏动有力且沉；右手脉象偏盛，有骨力，洪大，其中肺脉尤为明显，需进一步寻究。若脉象虚弦而长，应使用崔氏紫苏方服用。世人多以崔氏方治疗香港脚并取得疗效，却不知道此方只适用于治疗肺热引起的脚痛。
紫苏子 芍药 官桂 茵芋 茯苓 大腹皮 桔梗 甘草（炙，各一分） 麻黄（去节，一两） 黄芪（半两）
以上药物研为粗散，取生姜一片，煎煮三钱药量，作为饮品服用。
若是胃热导致宗筋失润，则脚部软弱无力，两足酸软，有时伴有轻微肿胀。诊察其脉象，胃脉一指弦而长，又微带疾数，六脉整体稍大，适宜使用此方。
大腹皮（半两） 茵芋（八铢） 杏仁（去尖） 茯苓 薏苡仁（各一分） 青橘皮（四铢） 川芎（十铢）
以上药物研为粗散，不拘时候，用姜水煎服。同时配合之前提到的暖肾药、壮元气药一起进服。如果服用此药后，大便轻微通利，就停止服用此药，转而进补药两三天，待病情安定后，再恢复服用此药。
Hong Kong Foot disease is generally caused by an excess of cold-dampness. Therefore, in the *Neijing* (Classic of Internal Medicine), when discussing the excess of Taiyin (Taiyin Excess), it mentions swelling of the lower legs and shins; when discussing the excess of Taiyang (Taiyang Excess), it mentions traction to the inner thigh with stiffness and rigidity of muscles and tendons. It also states that if the Earth Qi is excessive in a given year, severe cases may present with muscle atrophy, flaccidity and weakness of the feet unable to support weight, frequent spasms during walking, pain under the feet, bloating in the middle jiao after drinking, and edema of the four limbs. These are all formed by cold-damp qi. However, diseases in the world often have similar appearances but different natures, or different origins but identical manifestations. If medication is administered incorrectly, the benefits and harms will be reversed.
For instance, Hong Kong Foot disease originates from cold-damp excess, but it may progress to Lung Heat, or the pathology may arise from heat in the Stomach and foot, with wind generated in the foot. These conditions resemble Hong Kong Foot but differ significantly in their heat manifestations; they must be distinguished clearly. If heat causes foot pain, this relates to the pathway of the Lung Meridian. Thus, the *Neijing* states that if Metal Qi is excessive in a given year, the thighs, hips, and feet will all suffer. If Stomach heat causes foot disease, it is due to dysfunction of the Zongjin (Tendinous Convergence), which transmits into Wei Jue (Flaccidity and Cold Reversal).
Currently, there is a patient suffering from foot pain presenting with signs of cold-dampness from water and soil. The six pulses are deep, hidden, and active. The upper pulses are turbid while the lower pulses are deficient. The pulse at Chize (LU-5) is slightly fine and choppy. It is appropriate to warm the lower part using the following prescription:
Achyranthes Bidentatae Radix (Niu Xi, 1.5g)
Astragali Radix (Huangqi, 1.5g)
Angelicae Pubescentis Radix (Duhuo)
Angelicae Sinensis Radix (Danggui)
Ephedrae Herba (Mahuang, processed)
Ligustici Chuanxiong Rhizoma (Daxiong)
Dipsaci Radix (Xuduan)
Asari Radix et Rhizoma (Xixin)
(each 3.75g)
Grind the above into powder. Use Coicis Semen (Yiyiren) starch boiled into a thin paste to form pills the size of white mustard seeds. Take 50–70 pills on an empty stomach, washed down with warm wine or salted water.
If Lung heat leads to foot disease, the left hand pulse is entirely weak and fine, and the left Chi pulse is small, beating forcefully yet deeply. The right hand pulse is predominant, possessing "bone strength," being surging and large, with the Lung pulse being particularly pronounced; further investigation is required. If the pulse is deficient, wiry, and long, use Cui Shi's Perilla Formula (Cuishi Zisu Fang). Many people use Cui Shi's formula to treat Hong Kong Foot with success, unaware that this formula is only suitable for treating foot pain caused by Lung heat.
Perillae Fructus (Zisuzi)
Paeoniae Radix Alba (Shaoyao)
Cinnamomi Ramulus (Guangui)
Coprosmae Fructus (Yinyu)
Poria (Fuling)
Arecae Pericarpium (Dafupi)
Platycodonis Radix (Jiegeng)
Glycyrrhizae Radix et Rhizoma (Gancao, honey-fried)
(each 0.25g)
Ephedrae Herba (Mahuang, nodes removed, 3g)
Astragali Radix (Huangqi, 1.5g)
Grind the above into a coarse powder. Decoct with one slice of fresh ginger, taking approximately 9g of the mixture as a drink.
If Stomach heat causes the Zongjin to lose moisture, the feet become weak and powerless, sore and soft, sometimes with slight swelling. Diagnosing the pulse, the Stomach pulse is wiry and long upon one finger, slightly rapid, and the six pulses are generally larger. It is appropriate to use the following prescription:
Arecae Pericarpium (Dafupi, 1.5g)
Coprosmae Fructus (Yinyu, 2.25g)
Pruni Armeniacae Semens (Xingren, tip removed)
Poria (Fuling)
Coicis Semen (Yiyiren)
each 0.25g)
Citri Reticulatae Pericarpium Viride (Qingju pi, 1.5g)
Ligustici Chuanxiong Rhizoma (Chuanxiong, 3.75g)
Grind the above into a coarse powder. Decoct with ginger water at any time. Continue administering the previously mentioned Kidney-warming and Yuan-qi-strengthening medicines concurrently. If taking this medicine results in slight bowel movement, stop this medicine and administer tonifying medicines for two to three days. Once the condition stabilizes, resume this medicine.