香港脚肿满渐成水状者，邪气上攻脾肾也。夫脾，土气也。肾，水气也。香港脚者，清湿之
疾，
其气最易感于脾肾，同气相求之义也。脾受邪则湿气不行，肾受邪则水气不化，水湿二气，
内外合邪，积而成满，闭而成胀也。
赤苓汤
赤茯苓 防己 桑白皮 陈皮（一两半） 旋复（五钱） 杏仁 麻黄（去根节） 白
术紫苏（一两）
水煮黑豆汁盅半，煎药五钱，姜半分。
香港脚瘥后，邪气未尽，正气未复，或触恼怒，或感风湿，则其疾复发，与前症往往相似
，然与前法辄不应，要在随时令、审气体而治之。
四斤丸 干湿香港脚瘥后，常服令永不发。
牛膝 木瓜 肉苁蓉 天麻（各一斤）
酒五升，浸一日，晒干为末，用浸酒熬膏，丸梧子大，酒下三十丸。
《内经》谓风寒湿三气杂至合为痹，其风气胜者为行痹，寒气胜者为痛痹，湿气胜者为
着痹
。行痹者，行而不定，世称谓走注疼痛是也。痛痹者，疼痛苦楚，世称谓痛风是也。着痹者
，着而不移，世称谓麻木不仁是也。夫痹者闭也，五脏六腑之正气，为邪所闭，则痹而不仁
也。
《内经》论痹，又有骨、筋、脉、肌、皮五痹。大率风寒湿所谓三痹之病，又以所遇之
时，所
客之处而命其名，非此行痹、痛痹、着痹之外，又别有骨痹、筋痹、脉痹、肌痹、皮痹也。
风寒湿三气袭人经络，入于骨则重而不举，入于脉则血凝不流，入于筋则屈而不伸，入于肉
则不仁，入于皮则寒，久不已则入五脏。烦满喘呕者肺也。上气嗌干厥胀者心也。多饮数溲
，
夜卧则惊者肝也。尻以代踵，脊以代头者肾也。四肢懈惰，发咳呕沫者脾也。大抵显脏症则
难治矣。
香港脚（足部肿痛之病）出现肿胀满闷，逐渐形成水肿状的，是邪气向上攻犯脾脏和肾脏。脾属土气，肾属水气。香港脚属于清湿侵袭所致的疾病，其邪气最容易感应于脾和肾，这是“同气相求”的道理。脾受到邪气侵袭则湿气不能运化，肾受到邪气侵袭则水气不能气化，水湿两种邪气内外结合，积聚而成胀满，闭塞而成肿胀。
赤苓汤
组成：赤茯苓、防己、桑白皮、陈皮（各一两半）、旋覆花（五钱）、杏仁、麻黄（去除根和节）、白术、紫苏（各一两）。
煎服法：用黑豆汁一碗半煮水，取药五钱，加入生姜半分，煎煮服用。
香港脚病痊愈后，如果邪气尚未清除干净，正气尚未恢复，此时若遭遇恼怒情绪，或感受风湿之邪，则疾病容易复发，症状往往与前次相似，但使用之前的治疗方法通常无效。治疗关键在于根据时令变化、审察患者体质来进行辨证施治。
四斤丸
适用于干湿型香港脚病愈后，常服此方可使疾病永不复发。
组成：牛膝、木瓜、肉苁蓉、天麻（各一斤）。
制作与服用法：用酒五升浸泡一日，晒干后研为细末，将浸泡过的酒熬制成膏，与药末混合制成梧桐子大小的丸剂，每次用酒送服三十丸。
《黄帝内经》指出，风、寒、湿三种邪气混杂侵袭人体而合发为痹证。其中风气偏胜的称为行痹（游走性疼痛），寒气偏胜的称为痛痹（剧烈疼痛），湿气偏胜的称为着痹（重着麻木）。所谓行痹，是指疼痛部位游走不定，世人称之为走注疼痛。所谓痛痹，是指疼痛剧烈痛苦，世人称之为痛风。所谓着痹，是指病位固定不移，世人称之为麻木不仁。所谓“痹”，就是闭塞的意思，五脏六腑的正气被邪气闭塞，就会导致肢体麻痹不仁。
《黄帝内经》论述痹证时，还有骨痹、筋痹、脉痹、肌痹、皮痹五种分类。大体上，风寒湿所谓的三种痹证，是根据发病时节和邪气停留的部位来命名的，并非在行痹、痛痹、着痹之外，另外存在骨痹、筋痹、脉痹、肌痹、皮痹这五种独立的病种。
当风寒湿三气侵袭人体经络，进入骨骼则沉重难以抬举，进入血脉则血液凝滞不流，进入筋脉则屈伸不利，进入肌肉则感觉麻木不仁，进入皮肤则畏寒，久病不愈则会深入五脏。表现为烦闷喘逆呕吐的是肺痹；表现为气逆咽喉干燥厥冷腹胀的是心痹；表现为多饮多尿、夜间睡眠惊悸的是肝痹；表现为尾椎代替脚跟行走、脊柱弯曲头部前倾的是肾痹；表现为四肢懈怠无力、咳嗽吐沫的是脾痹。大抵而言，如果出现脏腑的症状，则病情难治。
Hong Kong Foot (a disease characterized by swelling and pain in the feet) presenting with distension and fullness gradually turning into edema indicates that pathogenic factors are attacking upward to the Spleen and Kidney. The Spleen corresponds to the Qi of Earth, and the Kidney corresponds to the Qi of Water. Hong Kong Foot is a disease caused by clear dampness; its pathogenic Qi easily affects the Spleen and Kidney, following the principle of "like attracting like" (Tong Qi Xiang Qiu). When the Spleen is affected by pathogens, dampness fails to transform; when the Kidney is affected, water Qi fails to vaporize. The combination of water and dampness pathogens internally and externally accumulates to cause fullness and obstruction to cause distension.
Chiling Tang (Red Poria Decoction)
Ingredients: Chifuling (Polyporus Umbellatus), Fangji (Stephaniae Tetrandrae Radix), Sangbaipi (Mori Cortex), Chenpi (Citri Reticulatae Pericarpium) [1.5 liang each]; Xuanfu (Inulae Flos) [5 qian]; Xingren (Armeniacae Semen Amarum); Mahuang (Ephedrae Herba, removed roots and joints); Baizhu (Atractylodis Macrocephalae Rhizoma); Zisu (Perillae Folium) [1 liang each].
Preparation and Administration: Boil 1.5 bowls of black bean decoction, take 5 qian of the herbs, add 0.5 fen of fresh ginger, and decoct for administration.
After Hong Kong Foot has healed, if pathogenic factors are not fully eliminated and healthy Qi has not recovered, encountering anger or being affected by wind-dampness may cause recurrence. The symptoms often resemble previous episodes, but previous treatment methods usually fail. Treatment must be based on seasonal changes and an assessment of the patient's constitution.
Sijin Wan (Four-Jin Pill)
Indicated for chronic use after recovery from dry or wet Hong Kong Foot to prevent recurrence permanently.
Ingredients: Niuxi (Achyranthis Bidentatae Radix), Mugua (Chaenomelis Fructus), Roucongrong (Cistanches Herba), Tianma (Gastrodiae Rhizoma) [1 jin each].
Preparation and Administration: Soak in 5 sheng of wine for one day, dry, and grind into powder. Use the soaked wine reduced to a paste to bind the powder into pills the size of wutong seeds. Take 30 pills with wine.
The *Neijing* states that wind, cold, and dampness mixing together cause Bi Syndrome (Obstruction Syndrome). When wind predominates, it is called Xing Bi (Wandering Bi); when cold predominates, it is called Tong Bi (Painful Bi); when dampness predominates, it is called Zhuo Bi (Fixed Bi). Xing Bi is characterized by wandering pain, commonly known as migrating pain. Tong Bi is characterized by severe pain, commonly known as gouty pain. Zhuo Bi is characterized by fixed heaviness and numbness, commonly known as insensibility. "Bi" means obstruction; when the healthy Qi of the five zang and six fu organs is obstructed by pathogens, numbness and loss of sensation occur.
The *Neijing* also discusses five types of Bi: Gu Bi (Bone Bi), Jin Bi (Sinew Bi), Mai Bi (Vessel Bi), Ji Bi (Muscle Bi), and Pi Bi (Skin Bi). Generally, the three Bi syndromes caused by wind, cold, and dampness are named according to the season of onset and the location of the pathogens; this does not imply that Bone, Sinew, Vessel, Muscle, and Skin Bi exist separately outside of Wandering, Painful, and Fixed Bi.
When wind, cold, and dampness invade the meridians and enter the bones, movement becomes heavy and difficult; entering vessels causes blood stagnation; entering sinews causes inability to flex and extend; entering muscles causes numbness; entering skin causes coldness. If prolonged, the pathogens enter the five zang organs. Distension, wheezing, and vomiting indicate Lung Bi; rising Qi, dry throat, cold limbs, and abdominal distension indicate Heart Bi; excessive thirst, frequent urination, and night terrors indicate Liver Bi; walking on the coccyx instead of heels and spinal curvature indicating head position indicates Kidney Bi; limb flaccidity, coughing, and frothy sputum indicate Spleen Bi. Generally, the appearance of zang organ symptoms indicates a difficult-to-treat condition.