《灵枢》曰∶发于胫名曰兔啮，其状如
赤豆，至骨，急治之，不急治害人也。
申斗垣曰∶鱼肚痈生小腿肚上，多因幼小坐卧湿地，引入风邪寒湿，透入骨间
遂成此证。半月不治。毒瓦斯攻心则死。（《启玄》）
王肯堂曰∶腓 疽生足小肚，寒热烦躁，属足少阴肾经，由肾水不足积热所致，
古云不治，溃出血脓者生，溃出清水者死。（《准绳》）
又曰∶风疽生脚 及曲 中痒，搔则黄汁出。（《准绳》）
《心法》曰∶腓 即小腿肚也。由肾虚膀胱积热凝结而成，古方悉云不治。若
赤高肿疼痛，溃出正脓而兼血者为顺，如漫肿下塌，紫暗 痛，溃出清水者为凶。初
服仙方活命饮，溃后八珍汤，气血两虚十全大补汤，下虚者用八味地黄丸补之。（《金鉴》）
自男妇缓风香港脚起，至扬州江甘仪妇女香港脚，治各不同，法则俱汇于此部中，以便检阅参治。
《太阴阳明论》曰∶阳受风气，阴受湿气。伤于风者，上先受之。伤于湿者，下
先受之。清湿袭虚则病起于下；风雨袭虚则病起于上。
《邪气脏腑病形篇》曰∶身半已上者，邪中之也，身半已下者，湿中之也。
《阴阳应象大论》曰∶地之湿气，感则害人皮肉筋脉。
《通评虚实论》曰∶ 跛寒风湿之病也。
《脏气法时论》曰∶脾苦湿，急食苦以燥之，禁湿地濡衣。
《调经论》曰∶寒湿之中人也，皮肤不收，肌肉坚紧，营血泣，卫气去，故曰虚。
虚者聂辟气不足，按之则气足以温之，故快然而不痛。
《五常政大论》曰∶太阴司天，湿气下临。
《六元正纪大论》曰∶太阳司天之政，民病寒湿，发肌肉萎，足萎不收。太阴司
天之政，民病寒湿，腹满身 愤 肿。太阴所致为重 肿。
《生气通天论》曰∶因于气为肿，四维相代，阳气乃竭。
《经脉篇》曰∶胃病则大腹水肿，膝膑肿痛。足阳明实则狂颠，虚则足不收胫枯。
《平人气象论》曰∶足胫肿曰水。
张景岳曰∶香港脚之说，古所无也，自晋苏敬始有此名。然其肿痛麻顽，即经之
所谓痹也；其纵缓不收，即经之所谓痿也；其甚而上冲，即经之所谓厥逆也。逮夫后
世，则有类伤寒四证，而以香港脚居其一，谓凡头痛发热，身痛便闭，而但见脚膝屈弱
无力者，便是香港脚，此说太混，予不然之。夫香港脚本水湿下壅之病，而实非阳邪外感
证也，若诸证之兼见者，则若有之。若以外感之脚软者，便认作香港脚，则淆乱意见，大不通也。
又曰∶香港脚之证，其初甚微，饮食动作无不如故，或无他疾而急得之，或因病
后而渐得之，及其病也，则自膝至足，或见麻痹，或见冷痛，或见痿弱，或见挛急，
或肿或不肿，或日渐枯细，或蒸蒸恶热，或洒洒恶寒，或如冰冷，或如火热，或到底
能食，或不能食，或有物如指，发自 腓而气上冲心，是皆香港脚之正病也。其有为
发热头痛，寒热往来，或腹内作痛，或见饮食则呕吐，或恶闻食气，或不欲见明，或
语言错乱，精神昏愦，是皆香港脚之兼证也。大抵此证有缓急，缓者其来渐，或二三月
而日甚，其来速或一二日而即起，治之若缓，恐其气上冲心，亦能杀人。
又曰∶香港脚之因有二∶一则自外而感，一则自内而致也。自外而感者，以阴寒水
湿雨雾之气，或坐卧湿地，致令湿邪袭人皮肉筋脉，而凡清湿袭虚则病始于下，致
为腿足之病，此外因也。自内而致者，以肥甘过度，酒醴无节，或多食乳酪湿热等
物，致令热壅下焦，走注足胫，而日渐渐肿痛，或上连手节者，此内因也。然在古
人谓南方卑湿，病多外因，北方嗜酒酪，病多内因，此固一说，然北方亦有寒湿，南
方岂少酒湿，此固不必分南北，其或内或外，凡受邪气，有病始于足而渐致他证者，
即香港脚之谓也。必察其因而治之，则自无失矣。
又曰∶方书以肿为湿香港脚，不肿者为干香港脚，湿者宜除湿，干者宜行气。
陈无择曰∶香港脚不专主一气，亦不专在一经，兼有杂生诸病，未易分别，须寻
经络之阴阳，再察脉息之虚实，以为治也。凡自汗走注者为风胜，无汗挛急制痛者为
寒胜，肿满重着为湿胜，烦渴燥热为暑胜，若四气兼中者，但察其多者为胜，分其表里以施治也。
张景岳曰∶香港脚之病，实三气之所为也，然亦有虚实之异。又香港脚本为壅疾，古
云忌用补剂，然必下元不足，及阳明之气有亏者，而后邪气得以犯之，此其中亦有
虚证。总之，凡治此者，只因证施治则万全，但察其因于表者，以发散为主；因于
里者，以疏利为主，外因者多寒湿，宜用湿热；内因者多湿热，宜用清凉。若元气
本虚及病久致虚者，必当培补下元，不得以忌补之说为拘也。
又曰∶香港脚初起，无非湿滞，如无他证兼见，而身体重着者，单宜治湿以分利
为主。凡脚膝中湿，或腰腿酸痛，重着肿痛者，宜除湿汤，不问久近干湿并可用。若
脚膝酸软重着，而胃气不清，或见噫气吞酸胀满者，平胃散。若香港脚浮肿而兼泄泻者，宜五苓散或胃苓汤。
又曰∶寒湿外浸致成香港脚者，十居六七，其证疼痛拘挛，恶寒清厥，脉多弦细，
治宜以温经除湿为主，是以古人治此之法，大抵热药多寒药少，故每用麻黄、川乌、桂、
附、干姜之属。《内经》曰∶湿淫于内，治以苦热。正以乌附麻黄走而不守，故能通
行经络，干姜、官桂辛甘大热，故能助阳退阴，清湿既除病无不愈。凡感寒湿雨水，
或四气流注，致成香港脚肿痛不可忍者，宜鸡鸣散如神。若寒湿内侵，阳虚阴盛，胃
气不强，经气不行，顽木浮肿，或疼痛不用者，独活汤。若寒邪入腹，喘急疼痛，或
筋急上冲，闷乱危急欲绝者，茱萸丸或茱萸木瓜汤。若寒湿在经，血脉不和，腰脚
筋骨酸软无力，或拘挛疼痛，脉弱而涩者，酒浸牛膝丸。若寒湿壅肿，气滞不行，或
冷或痛者，立效散。若寒湿兼风者，如五积散、小续命汤皆宜用。
又曰∶湿热内蒸，致成香港脚者，多因酒食不节，其证必烦热多渴，脉见滑数，二
便或多不利，治宜利湿清火为主。若湿热下壅，足胫肿痛不消者，防己饮加减治之，
或苍术黄柏丸，或二妙散，或加味二妙丸俱妙。若湿热气壅，上冲胸腹，烦渴闷乱，
头痛口干者，活人犀角散。若湿热流注经络，肢节烦疼，脊背沉重，手足遍身疼痛
热肿者，当归拈痛汤。若感冒暑湿，肢节疼痛，身热口渴，小便赤涩，气虚气促者，
清暑益气汤。若肝肾阴虚血热，脚脊疼痛，行止艰难，小水不利者，续断丸。
又曰∶香港脚壅滞气逆者，其证必喘满气急，上攻心腹，甚至危急可畏，治宜行
滞降气为主。凡香港脚上冲，心腹喘急不得眠卧者，紫苏散、槟榔汤或加减槟榔汤，甚
者四磨饮。若香港脚喘急，腹满脚肿者，桑白皮散或木通散。若香港脚脐下气升冲心烦
闷者，木香散或槟榔散。若香港脚心胸壅闷，呕逆多痰不食者，半夏散或紫苏汤。若浮
肿心腹痞闷，小水不利，大腹皮散。
又曰∶风湿合邪而为香港脚者，其证必兼外感，而或为寒热往来，或为喘咳气急，
或流走无常，或筋骨疼痛，治宜以散风除湿，通行经络为主。若感四时风疫风湿，或
处阴湿之地，致为香港脚痿弱，筋骨疼痛，或寒热往来者，败毒散。若寒热如疟，赤肿
疼痛者，加味败毒散。若香港脚以风寒湿邪客于经络，而骨髓酸痛不可忍，或遍身疼
痛，恶寒呕逆者，五积散。一法加全蝎三个，入酒煎服。若香港脚以风湿留滞，而阴
寒外闭，表邪不解，或咳嗽喘满寒热者，小
青龙汤。若风湿留滞，肢节烦疼，心神壅闷者，大腹子散。《千金》云∶若香港脚脉大
而缓，宜服小续命汤二剂立瘥。《活人》云∶香港脚属冷者，以小续命汤煎成，入生姜自
然汁服之，最快。若香港脚风湿胜而兼发热咳嗽，肢体疼痛者，芎芷香苏散。若香港脚
风湿流注，憎寒发热，无汗恶寒者，麻黄左经汤。
又曰∶香港脚有虚证，凡脾胃肝肾之脉，皆出于足，邪之易入，多有乘虚，故肝虚
则筋病，肾虚则骨病，脾虚则肌肉病，胃虚则宗筋病，或以劳欲不节，或以酒湿太
过，或以病后失调，凡内有亏损，而外有香港脚者，无非虚证，此当以调补为主，而
兼察四气以治之。若肝肾阴虚，感触四气而瘫痪顽木，半身不随，脚膝无力，遍体
疼痛者，神应养真丹，或三因四斤丸，或虎骨酒，或八味地黄汤。若脾胃大虚，阴
寒在下，阳气不行而病香港脚者，独活汤，附子八味汤。若精血不足，阴虚于下，气不
归精，而香港脚上逆冲心者，地黄汤。若脾胃虚寒，兼风湿外邪而成香港脚者，用引独
活汤，或追毒汤。若香港脚以脾肾虚寒而兼咳嗽、气逆呕吐者，兼补，浓朴汤。
又曰∶香港脚有实邪，凡壅盛肿痛，而或为闭结，或为胀满者，治宜以疏导通利
为主。若风湿壅盛，香港脚肿痛，便结腹满者，羌活导滞汤，或枳实大黄汤。若四气
流注，阳明风热，腰脚肿痛，大小便秘，喘满腹痛者，大黄左经汤。若香港脚饮食不消，
心下痞闷，腿脚肿痛者，开结导饮丸。
又曰∶凡香港脚肿痛之甚者，可用敷药以散之，或用椒艾囊以温之，或用香散之
药煎汤以洗之，如百草煎及防风、荆芥、威灵仙、艾叶、苍术、蛇床子、当归、乌药
之类皆可用，或单用紫苏，或忍冬藤煎汤淋洗，俱妙。
观《活人》等书云∶凡香港脚服补药及用汤淋洗者，皆医之所禁也，此亦一偏之
说耳。盖补有宜禁者，以邪壅气实者也。淋
洗有宜禁者，以水湿汤气之宜避者也。如果下部虚寒，或以病后，或以克伐太过，而
香港脚不愈者，岂尚堪禁补乎！又寒邪湿热壅结不散，而为肿为痛者，最宜以辛香疏
散之药，煎汤蒸洗，则退邪极速，岂禁洗乎！惟是湿热逆而上冲心腹者，不可骤洗，
恐助湿气上升也。此必先降其气，俟其毒止在脚，再行熏洗，自无不利，盖补以补
其弱也，洗以逐其滞也，夫何禁之有！
又曰∶有当禁于未发之先者，如《外台秘要》云∶第一忌嗔，嗔则心烦，烦则
香港脚发；又禁大语，大语则伤气，气伤病亦发；又不得露足当风入水，以冷水洗足，
两足胫尤不宜冷，虽暑月当着帛 ，至冬寒加绵，常令两胫及腿温暖，微汗尤佳，根据
此将息，香港脚自消，而无邪气留连之患。夏月腠理开，不宜当风取凉，凉处坐卧，须
得劳动关节，令其气畅。此拒邪之法，养生之要也。每食后宜行三五百步，疲倦便
止，则脚中恶气，随即下散，虽有浮肿，气亦不上也。
孙真人曰∶古人少有此疾，自永嘉南
渡，衣冠之人多有之，此皆湿郁于内所致也。故凡四时之中，皆不得久坐久立湿冷
之地，亦不得因酒醉汗出，脱衣洗足，当风取凉，皆成香港脚。暑月久坐久立湿地，则
湿热之气蒸人经络，病发必热，而四肢酸痛，烦闷， 肿寒热，此又山野农夫多有之，以久湿伤于外也。
杨大受曰∶香港脚是壅疾，当用宣通之剂，使气不能成壅也。如羌活导滞汤之类
所宜通用。又如苍白术、防己、南星以去湿，羌独活、木瓜、槟榔行气利关节以去
壅，佐木通、牛膝以引经，当归、生地以和血，此必用之药也。又如东垣拈痛汤之
类亦甚捷。余因证之虚实寒热而辨治之，此即通变活法也。
又曰∶凡香港脚初觉，即灸患处二三十壮，或用雷火针以导引湿气外出，及饮醪
醴以通经散邪，其要法也。若壅既成而邪
盛者，必肿痛热甚，一时药饵难散，宜砭去恶血，以消热肿，砭刺之后，以药继之。
古无香港脚，《内经》名厥，两汉名缓风，宋齐谓香港脚。
《内经》曰∶伤于湿者，下先受之。（发于外者，属足少阴、太阳；发于内者，属足太阴、阳明。）
《千金》论曰∶此病初得，即先从脚起，因即胫肿，时人号为香港脚。经曰∶缓风湿
痹。深师云∶脚弱者即此义也。得此病者多不令人即觉，或会他病一度，乃始发动，
或奄然大闷，经二三日不起，方乃觉之，久而不瘥，遍及四肢腰背头项也。始起甚微，
食饮嬉戏，气力如故，惟卒起脚屈弱不能动，有此为异耳。或热闷惊悸，心烦呕吐，
或觉脐下冷痞， 然不快，兼小便淋漓，不似生平，皆其候也。
冯鲁瞻曰∶经曰∶诸湿肿满，皆属脾土。又曰∶伤于湿者，下先受之。盖脾主
四肢，足居于下，而多受湿，湿郁成热，湿热相搏，其痛作矣。古名为壅疾，当用宣
通之剂，如羌活导滞汤、当归拈痛汤之类，使气不壅而痛自愈矣。古无香港脚之说，《内
经》名厥，两汉间名缓风，宋齐之后谓之香港脚。凡肿者名湿香港脚者，筋脉弛长而软，
或浮肿是也，治宜利湿疏风。如不肿者名干香港脚者，干即热也，筋脉蜷缩挛痛，枯
细而不肿者是也，治宜润血清燥，有从外感者，有从内伤者，其为湿热则一而已。北
方高燥，多饮HT 酪肉食醇酒，湿热下流所致，南方卑下多湿，血气虚弱之人，或遇
《灵枢》说：发于小腿的疽病叫做“兔啮”，其症状像赤豆一样，深入骨骼，必须紧急治疗，如果不及时救治会危害生命。
申斗垣说：鱼肚痈生长在小腿肚上，多因为年幼时坐卧湿地，导致风邪寒湿侵入，透入骨间，从而形成这种病症。如果半个月不治疗，毒气攻心就会死亡。（出自《启玄》）
王肯堂说：腓肠疽生长在足部小腿肚，伴有寒热烦躁，属于足少阴肾经，由肾水不足、积热所致。古人称此病不治，如果溃破流出血脓的可以存活，如果溃破流出清水的则死亡。（出自《准绳》）
他又说：风疽生长在脚胫及膝盖弯曲处，感到瘙痒，搔抓后会有黄色汁液流出。（出自《准绳》）
《医宗金鉴·心法要诀》说：腓肠即小腿肚。由于肾虚、膀胱积热凝结而成，古方都说此病不治。如果红肿高起疼痛，溃破后流出正常脓液并带血的为顺证；如果漫肿下塌，颜色紫暗疼痛，溃破后流出清水的为逆证（凶险）。初期服用仙方活命饮，溃破后服用八珍汤，气血两虚者服用十全大补汤，下焦虚弱者用八味地黄丸补益。（出自《金鉴》）
从男女缓风香港脚开始，到扬州江甘仪妇女香港脚，治疗方法各不相同，但法则都汇集在这一部分中，以便查阅参考治疗。
《素问·太阴阳明论》说：阳经受风气，阴经受湿气。伤于风的，上部先受邪；伤于湿的，下部先受邪。清湿侵袭虚处则病起于下；风雨侵袭虚处则病起于上。
《素问·邪气脏腑病形篇》说：身体半以上，是邪气所中；身体半以下，是湿气所中。
《素问·阴阳应象大论》说：地的湿气，感之则伤害人的皮肉筋脉。
《素问·脏气法时论》说：脾怕湿，急食苦味以燥湿，禁止坐卧湿地和穿潮湿的衣服。
《素问·调经论》说：寒湿中人，皮肤松弛不收，肌肉坚紧，营血凝涩，卫气离去，所以称为虚。虚证表现为气机不足，按压则气足可以温煦，所以舒适而不痛。
《素问·六元正纪大论》说：太阳司天之政，民众易患寒湿病，出现肌肉萎缩，足痿不能收持。太阴司天之政，民众易患寒湿病，腹部胀满，身体浮肿。太阴所致的是严重的浮肿。
《素问·生气通天论》说：因气（风邪）而致肿，四维之气交替侵犯，阳气乃竭。
《灵枢·经脉篇》说：胃病则大腹水肿，膝膑肿痛。足阳明胃经实证则狂癫，虚证则足不能收持，小腿枯瘦。
张景岳说：香港脚的说法，古代是没有的，自晋代苏敬才开始有此名。然而其肿痛麻木顽钝，就是经典所说的痹症；其纵缓不能收持，就是经典所说的痿症；其严重而上冲，就是经典所说的厥逆症。到了后世，则有类似伤寒的四证，而把香港脚列为其中一证，说凡是头痛发热，身痛便秘，而只见脚膝屈弱无力的，便是香港脚，这种说法太混淆，我不认同。夫香港脚本是水湿下壅的疾病，其实并非阳邪外感的证候，如果诸证兼见，那或许有。如果把以外感导致的脚软，就认作香港脚，那就混淆了见解，非常不通。
他又说：香港脚的证候，起初很轻微，饮食动作如常，或者没有其他疾病而突然得之，或者因病后逐渐得之，等到发病时，则从膝至足，或者见到麻痹，或者见到冷痛，或者见到痿弱，或者见到挛急，或者肿或者不肿，或者日渐枯细，或者蒸蒸恶热，或者洒洒恶寒，或者像冰冷，或者像火热，或者到底能进食，或者不能进食，或者有物如手指，从小腿肚发出而气上冲心，这些都是香港脚的正病。那些有发热头痛，寒热往来，或者腹内作痛，或者看见食物就呕吐，或者厌恶闻食物的气味，或者不想见光亮，或者语言错乱，精神昏愦，这些都是香港脚的兼证。大抵此证有缓急之分，缓者其来渐，或者两三个月而日益加重，其来速或者一二日就发作，治疗如果迟缓，恐怕其气上冲心，也能杀人。
他又说：香港脚的病因有二：一则自外感受，一则自内生致。自外感受的，是因为阴寒水湿雨雾之气，或者坐卧湿地，致使湿邪侵袭人的皮肉筋脉，而凡清湿侵袭虚处则病始于下，导致腿足之病，这是外因。自内生致的，是因为肥甘过度，酒醴无节制，或多食乳酪湿热等物，致使热壅下焦，走注足胫，而日渐肿痛，或者上连手节的，这是内因。然而在古人认为南方卑湿，病多外因，北方嗜酒酪，病多内因，这固然是种说法，然而北方也有寒湿，南方难道缺少酒湿吗？这固然不必分南北，其或内或外，凡受邪气，有病始于足而逐渐导致其他证的，就是香港脚。必须察明病因而治疗，就不会有失误了。
他又说：方书以肿为湿香港脚，不肿者为干香港脚，湿者宜除湿，干者宜行气。
陈无择说：香港脚不专主一气，也不专在一经，兼有杂生诸病，不容易分别，须寻经络之阴阳，再察脉息之虚实，作为治疗的依据。凡自汗走注的是风胜，无汗挛急制痛的是寒胜，肿满重着的是湿胜，烦渴燥热的是暑胜，如果四气兼中者，只察其多者为胜，分辨表里以施治。
张景岳说：香港脚的病，实是三气所为，然而也有虚实之别。又香港脚本为壅疾，古人说忌用补剂，然而必下元不足，以及阳明之气有亏者，而后邪气得以犯之，这其中也有虚证。总之，凡是治疗此病，只因证施治则万全，只察其因于表者，以发散为主；因于里者，以疏利为主，外因者多寒湿，宜用温热药；内因者多湿热，宜用清凉药。若元气本虚及病久致虚者，必须培补下元，不得以忌补之说为拘束。
他又说：香港脚初起，无非湿滞，如果没有他证兼见，而身体重着的，单宜治湿以分利为主。凡脚膝中湿，或者腰腿酸痛，重着肿痛者，宜用除湿汤，不问久近干湿均可使用。若脚膝酸软重着，而胃气不清，或者见噫气吞酸胀满者，用平胃散。若香港脚浮肿而兼泄泻者，宜用五苓散或胃苓汤。
他又说：寒湿外浸致成香港脚的，十居六七，其证疼痛拘挛，恶寒清厥，脉多弦细，治疗宜以温经除湿为主，所以古人治此之法，大抵热药多而寒药少，故每用麻黄、川乌、桂枝、附子、干姜之类。《内经》说：湿淫于内，治以苦热。正是以乌头、附子、麻黄走而不守，故能通行经络，干姜、官桂辛甘大热，故能助阳退阴，清湿既除病无不愈。凡感寒湿雨水，或者四气流注，致成香港脚肿痛不可忍者，宜用鸡鸣散如神。若寒湿内侵，阳虚阴盛，胃气不强，经气不行，顽木浮肿，或者疼痛不用者，用独活汤。若寒邪入腹，喘急疼痛，或者筋急上冲，闷乱危急欲绝者，用茱萸丸或茱萸木瓜汤。若寒湿在经，血脉不和，腰脚筋骨酸软无力，或者拘挛疼痛，脉弱而涩者，用酒浸牛膝丸。若寒湿壅肿，气滞不行，或者冷或者痛者，用立效散。若寒湿兼风者，如五积散、小续命汤皆宜用。
他又说：湿热内蒸，致成香港脚的，多因酒食不节，其证必烦热多渴，脉见滑数，二便或多不利，治疗宜利湿清火为主。若湿热下壅，足胫肿痛不消者，防己饮加减治之，或者苍术黄柏丸，或者二妙散，或者加味二妙丸俱妙。若湿热气壅，上冲胸腹，烦渴闷乱，头痛口干者，用活人犀角散。若湿热流注经络，肢节烦疼，脊背沉重，手足遍身疼痛热肿者，用当归拈痛汤。若感冒暑湿，肢节疼痛，身热口渴，小便赤涩，气虚气促者，用清暑益气汤。若肝肾阴虚血热，脚脊疼痛，行止艰难，小水不利者，用续断丸。
他又说：香港脚壅滞气逆者，其证必喘满气急，上攻心腹，甚至危急可畏，治疗宜行滞降气为主。凡香港脚上冲，心腹喘急不得眠卧者，用紫苏散、槟榔汤或加减槟榔汤，甚者用四磨饮。若香港脚喘急，腹满脚肿者，用桑白皮散或木通散。若香港脚脐下气升冲心烦闷者，用木香散或槟榔散。若香港脚心胸壅闷，呕逆多痰不食者，用半夏散或紫苏汤。若浮肿心腹痞闷，小水不利者，用大腹皮散。
他又说：风湿合邪而为香港脚者，其证必兼外感，而或为寒热往来，或为喘咳气急，或流走无常，或筋骨疼痛，治疗宜以散风除湿，通行经络为主。若感四时风疫风湿，或者处于阴湿之地，致为香港脚痿弱，筋骨疼痛，或者寒热往来者，用败毒散。若寒热如疟，赤肿疼痛者，用加味败毒散。若香港脚以风寒湿邪客于经络，而骨髓酸痛不可忍，或者遍身疼痛，恶寒呕逆者，用五积散。一法加全蝎三个，入酒煎服。若香港脚以风湿留滞，而阴寒外闭，表邪不解，或者咳嗽喘满寒热者，用小青龙汤。若风湿留滞，肢节烦疼，心神壅闷者，用大腹子散。《千金方》说：若香港脚脉大而缓，宜服小续命汤二剂立瘥。《活人书》说：香港脚属冷者，以小续命汤煎成，入生姜自然汁服之，最快。若香港脚风湿胜而兼发热咳嗽，肢体疼痛者，用芎芷香苏散。若香港脚风湿流注，憎寒发热，无汗恶寒者，用麻黄左经汤。
他又说：香港脚有虚证，凡脾胃肝肾之脉，皆出于足，邪之易入，多有乘虚，故肝虚则筋病，肾虚则骨病，脾虚则肌肉病，胃虚则宗筋病，或者以劳欲不节，或者以酒湿太过，或者以病后失调，凡内有亏损，而外有香港脚者，无非虚证，此当以调补为主，而兼察四气以治之。若肝肾阴虚，感触四气而瘫痪顽木，半身不随，脚膝无力，遍体疼痛者，用神应养真丹，或者三因四斤丸，或者虎骨酒，或者八味地黄汤。若脾胃大虚，阴寒在下，阳气不行而病香港脚者，用独活汤，附子八味汤。若精血不足，阴虚于下，气不归精，而香港脚上逆冲心者，用地黄汤。若脾胃虚寒，兼风湿外邪而成香港脚者，用引独活汤，或者追毒汤。若香港脚以脾肾虚寒而兼咳嗽、气逆呕吐者，兼补，用浓朴汤。
他又说：香港脚有实邪，凡壅盛肿痛，而或为闭结，或者为胀满者，治疗宜以疏导通利为主。若风湿壅盛，香港脚肿痛，便结腹满者，用羌活导滞汤，或者枳实大黄汤。若四气流注，阳明风热，腰脚肿痛，大小便秘，喘满腹痛者，用大黄左经汤。若香港脚饮食不消，心下痞闷，腿脚肿痛者，用开结导饮丸。
他又说：凡香港脚肿痛之甚者，可用敷药以散之，或者用椒艾囊以温之，或者用香散之药煎汤以洗之，如百草煎及防风、荆芥、威灵仙、艾叶、苍术、蛇床子、当归、乌药之类皆可用，或者单用紫苏，或者忍冬藤煎汤淋洗，俱妙。
观《活人书》等书记载：凡香港脚服补药及用汤淋洗者，都是医生所禁忌的，这也是偏颇的说法罢了。盖补有宜禁者，以邪壅气实者也。淋洗有宜禁者，以水湿汤气之宜避者也。如果下部虚寒，或者因病后，或者以克伐太过，而香港脚不愈者，岂尚堪禁补乎！又寒邪湿热壅结不散，而为肿为痛者，最宜以辛香疏散之药，煎汤蒸洗，则退邪极速，岂禁洗乎！惟是湿热逆而上冲心腹者，不可骤洗，恐助湿气上升也。此必先降其气，俟其毒止在脚，再行熏洗，自无不利，盖补以补其弱也，洗以逐其滞也，夫何禁之有！
他又说：有当禁于未发之先者，如《外台秘要》说：第一忌嗔怒，嗔怒则心烦，烦则香港脚发；又禁大声说话，大语则伤气，气伤病亦发；又不得露足当风入水，以冷水洗足，两足胫尤不宜冷，虽暑月当着帛履，至冬寒加绵，常令两胫及腿温暖，微汗尤佳，根据此将息，香港脚自消，而无邪气留连之患。夏月腠理开，不宜当风取凉，凉处坐卧，须得劳动关节，令其气畅。此拒邪之法，养生之要也。每食后宜行三五百步，疲倦便止，则脚中恶气，随即下散，虽有浮肿，气亦不上也。
孙真人说：古人少有此疾，自永嘉南渡，衣冠之人多有之，这都是湿郁于内所致也。故凡四时之中，皆不得久坐久立湿冷之地，也不得因酒醉汗出，脱衣洗足，当风取凉，皆成香港脚。暑月久坐久立湿地，则湿热之气蒸人经络，病发必热，而四肢酸痛，烦闷，浮肿寒热，这又是山野农夫多有之，以久湿伤于外也。
杨大受说：香港脚是壅疾，当用宣通之剂，使气不能成壅也。如羌活导滞汤之类所宜通用。又如苍白术、防己、南星以去湿，羌独活、木瓜、槟榔行气利关节以去壅，佐木通、牛膝以引经，当归、生地以和血，此必用之药也。又如东垣拈痛汤之类亦甚捷。余因证之虚实寒热而辨治之，此即通变活法也。
他又说：凡香港脚初觉，即灸患处二三十壮，或者用雷火针以导引湿气外出，及饮醪醴以通经散邪，其要法也。若壅既成而邪盛者，必肿痛热甚，一时药饵难散，宜砭去恶血，以消热肿，砭刺之后，以药继之。
《内经》说：伤于湿者，下先受之。（发于外者，属足少阴、太阳；发于内者，属足太阴、阳明。）
《千金方》论说：此病初得，即先从脚起，因即胫肿，时人号为香港脚。经说：缓风湿痹。深师云：脚弱者即此义也。得此病者多不令人即觉，或者会他病一度，乃始发动，或者奄然大闷，经二三日不起，方乃觉之，久而不瘥，遍及四肢腰背头项也。始起甚微，食饮嬉戏，气力如故，惟卒起脚屈弱不能动，有此为异耳。或者热闷惊悸，心烦呕吐，或者觉脐下冷痞，然不快，兼小便淋漓，不似生平，皆其候也。
冯鲁瞻说：经说：诸湿肿满，皆属脾土。又说：伤于湿者，下先受之。盖脾主四肢，足居于下，而多受湿，湿郁成热，湿热相搏，其痛作矣。古名为壅疾，当用宣通之剂，如羌活导滞汤、当归拈痛汤之类，使气不壅而痛自愈矣。古无香港脚之说，《内经》名厥，两汉间名缓风，宋齐之后谓之香港脚。凡肿者名湿香港脚者，筋脉弛长而软，或者浮肿是也，治宜利湿疏风。如不肿者名干香港脚者，干即热也，筋脉蜷缩挛痛，枯细而不肿者是也，治宜润血清燥，有从外感者，有从内伤者，其为湿热则一而已。北方高燥，多饮乳酪肉食醇酒，湿热下流所致，南方卑下多湿，血气虚弱之人，或遇
The *Ling Shu* states: A carbuncle occurring on the shin is called "Rabbit Bite" (Tu Nie). Its appearance resembles a red bean, penetrating to the bone. It requires urgent treatment; if not treated promptly, it will be harmful to life.
Shen Douyuan stated: The "Fish Belly Carbuncle" (Yu Du Yong) arises on the calf muscle belly. It is often caused by sitting or lying on damp ground during childhood, allowing wind-cold-dampness pathogens to invade and penetrate into the interstices of the bones, thereby forming this condition. If untreated for half a month, toxic qi attacks the heart, leading to death. (*Qi Xuan*)
Wang Kentang stated: Pharyngeal carbuncle (Fei Ju) occurs on the calf muscle belly, accompanied by chills, fever, irritability, and restlessness. It belongs to the Foot Shaoyin Kidney Meridian, caused by insufficiency of Kidney Water and accumulation of heat. Ancient texts claim it is incurable; however, if ulceration discharges bloody pus, the patient survives; if it discharges clear water, the patient dies. (*Zhun Sheng*)
He further stated: Wind carbuncle (Feng Ju) occurs in the shins and popliteal fossa, causing itching. Scratching results in the discharge of yellow fluid. (*Zhun Sheng*)
The *Xin Fa* states: The calf muscle belly (Fei) is formed due to Kidney deficiency and heat accumulation in the Bladder condensing together. Ancient formulas consider it incurable. If there is high red swelling and pain, and upon ulceration, normal pus mixed with blood is discharged, it is a favorable sign (Shun). If there is diffuse swelling with sinking, dark purple discoloration, and pain, and upon ulceration, clear water is discharged, it is an ominous sign (Xiong). In the initial stage, administer Xian Fang Huo Ming Yin. After ulceration, administer Ba Zhen Tang. For Qi and Blood dual deficiency, administer Shi Quan Da Bu Tang. For lower jiao deficiency, use Ba Wei Di Huang Wan to tonify. (*Jin Jian*)
From the onset of slow wind and Hong Kong foot (Xiang Gang Jiao) in men and women, up to cases in women from Jianggan, Yangzhou, treatments vary, but all principles are compiled in this section for reference and treatment.
The *Tai Yin Yang Ming Lun* states: Yang meridians receive wind pathogens, while Yin meridians receive dampness pathogens. Those injured by wind are affected first in the upper body. Those injured by dampness are affected first in the lower body. Clear dampness attacking deficiency causes disease to originate in the lower body; wind and rain attacking deficiency cause disease to originate in the upper body.
The *Xie Qi Zang Fu Bing Xing Pian* states: Pathogens attack the upper half of the body; dampness attacks the lower half of the body.
The *Yin Yang Ying Xiang Da Lun* states: Dampness from the earth, when contracted, harms the skin, flesh, sinews, and vessels.
The *Tong Ping Xu Shi Lun* states: Lameness, coldness, and wind-dampness belong to such diseases.
The *Zang Qi Fa Shi Lun* states: The Spleen dislikes dampness; urgently consume bitter flavors to dry it. Avoid sitting on damp ground or wearing wet clothes.
The *Tiao Jing Lun* states: When cold-dampness invades humans, the skin becomes loose and unrestrained, muscles become firm and tight, Ying Blood stagnates, and Wei Qi departs. Thus, it is called deficiency. Deficiency manifests as insufficient Qi; pressing the area generates sufficient Qi to warm it, resulting in comfort and absence of pain.
The *Wu Chang Zheng Da Lun* states: When Tai Yin governs the year, dampness descends.
The *Liu Yuan Zheng Ji Da Lun* states: When Tai Yang governs the administration, the people suffer from cold-dampness, developing muscle atrophy and foot flaccidity unable to hold position. When Tai Yin governs the administration, the people suffer from cold-dampness, abdominal fullness, and general edema. Tai Yin causes severe edema.
The *Sheng Qi Tong Tian Lun* states: Swelling due to Qi (Wind); when the four dimensions alternate in attack, Yang Qi is exhausted.
The *Jing Mai Pian* states: Stomach disease leads to large abdominal edema and painful swelling of the knee patella. Excess in the Foot Yangming Meridian causes mania and epilepsy; deficiency causes inability to hold the feet and withered shins.
The *Ping Ren Qi Xiang Lun* states: Swelling of the feet and shins is called Water Disease.
Zhang Jingyue stated: The concept of Hong Kong foot did not exist in ancient times; it originated with Su Jing of the Jin Dynasty. However, its symptoms of pain, swelling, numbness, and stiffness correspond to the Bi Syndrome described in the classics; its flaccidity and inability to hold correspond to the Wei Syndrome; its severity and upward rushing correspond to Jue Ni (Rebellious Counterflow). Later generations classified it among four syndromes similar to Shang Han (Cold Damage), considering any case with headache, fever, body pain, constipation, and weak knees/feet as Hong Kong foot. This classification is too confused, and I disagree. Hong Kong foot is fundamentally a disease of water-dampness obstruction in the lower jiao, not an exterior syndrome of Yang pathogenic factors. Although concurrent symptoms may occur, mistaking exterior-induced leg weakness for Hong Kong foot confuses diagnostic concepts and is incorrect.
He further stated: The manifestations of Hong Kong foot are initially subtle, with diet and movement remaining normal. It may arise suddenly without other illnesses, or gradually after another disease. Once manifested, from the knee to the foot, one may observe numbness, cold pain, flaccidity, spasms, swelling or lack thereof, gradual thinning, feeling of heat, aversion to cold, icy coldness, burning heat, ability or inability to eat, or a sensation like a finger rising from the calf to rush to the heart. These are the primary symptoms of Hong Kong foot. Secondary symptoms include fever, headache, alternating chills and fever, abdominal pain, vomiting upon seeing food, aversion to food odors, aversion to light, confusion of speech, and mental dullness. Generally, this disease has rapid and slow courses. Slow onset progresses over months; rapid onset occurs within days. Delayed treatment risks Qi rushing to the heart, which can be fatal.
He further stated: There are two causes of Hong Kong foot: external contraction and internal generation. External causes involve Yin cold, water, dampness, rain, fog, or sitting/lying on damp ground, allowing damp pathogens to invade skin, flesh, sinews, and vessels. Since clear dampness attacks deficiency starting from below, it causes leg and foot diseases. Internal causes involve excessive rich/greasy food and unregulated alcohol consumption, or excessive intake of milk/cheese/damp-heat foods, causing heat to obstruct the lower jiao and travel to the shins, leading to progressive swelling/pain or extension to hand joints. Ancients believed Southern regions' dampness caused external diseases, while Northern regions' wine/cheese habits caused internal diseases. However, both regions have both causes. Regardless of origin, any disease starting in the feet and progressing constitutes Hong Kong foot. One must investigate the cause to treat effectively.
He further stated: Medical texts classify swollen cases as Damp Hong Kong foot and non-swollen cases as Dry Hong Kong foot. Damp types require damp-draining; Dry types require Qi-moving.
Chen Wuyue stated: Hong Kong foot does not belong to a single Qi or Meridian but involves various complications. Diagnosis requires examining the Yin/Yang of meridians and the Deficiency/Excess of pulses. Sweating and wandering pain indicate Wind excess; no sweating, spasms, and severe pain indicate Cold excess; swelling, heaviness, and sticking indicate Damp excess; irritability, thirst, and dry heat indicate Summerheat excess. When multiple pathogens combine, identify the predominant one and treat based on Interior/Exterior differentiation.
Zhang Jingyue stated: Hong Kong foot is caused by three pathogens but varies in Deficiency/Excess. Although ancients forbade tonics for this obstructive disease, deficiency in the Lower Yuan or deficiency of Yangming Qi allows pathogens to invade, creating deficiency patterns. Treatment should always match the syndrome. Exterior causes require dispersing; Interior causes require draining/unblocking. External causes are mostly cold-damp, requiring warm-hot herbs; internal causes are mostly damp-heat, requiring cool-clear herbs. If original Qi is deficient or prolonged illness causes deficiency, Lower Yuan must be tonified; do not rigidly adhere to the prohibition of tonics.
He further stated: Initial Hong Kong foot involves damp-stagnation. Without concurrent symptoms but with heavy body, treat dampness primarily via diuresis. For dampness in feet/knees, back/leg soreness, heaviness, swelling, and pain, use Chu Shi Tang regardless of duration or type. If feet/knees are sore/heavy with unclear Stomach Qi, belching, acid regurgitation, and fullness, use Ping Wei San. For Hong Kong foot edema with diarrhea, use Wu Ling San or Wei Ling Tang.
He further stated: Sixty percent of Hong Kong foot cases result from external cold-damp invasion. Symptoms include painful spasms, aversion to cold, cold extremities, and wiry/thin pulses. Treatment prioritizes warming meridians and draining dampness. Ancients used more hot than cold herbs, such as Ephedrae Herba (Mahuang), Aconiti Lateralis Radix Praeparata (Chuanwu), Cinnamomi Ramulus (Guizhi), Aconiti Radix Praeparata (Fuzi), and Zingiberis Rhizoma (Ganjiang). The *Nei Jing* states: "For dampness overflowing internally, treat with bitter-hot." Mahuang, Chuanwu, and Fuzai move freely and unblock meridians; Ganjiang and Guizhi are acrid-sweet and greatly hot, assisting Yang and retreating Yin. Once clear dampness is removed, the disease heals. For unbearable swelling/pain from cold-damp/rain or four-pathogen flow, use Ji Ming San. For internal cold-damp invasion with Yang deficiency, strong Yin, weak Stomach Qi, stagnant meridian Qi, stiff/swollen limbs, or immobility/pain, use Du Huo Tang. For cold pathogen entering the abdomen with panting, urgency, pain, tendon spasm rushing upward, or critical distress, use Zhuyu Wan or Zhuyu Mugua Tang. For cold-damp in meridians with poor blood circulation, weak/sore waist/legs, spasms/pain, and weak/choppy pulses, use Jiu Jin Niuxi Wan. For cold-damp obstruction/swelling, Qi stagnation, cold, or pain, use Li Xiao San. For cold-damp combined with wind, use Wu Ji San or Xiao Xu Ming Tang.
He further stated: Internal steaming of damp-heat causes Hong Kong foot, often due to irregular diet/alcohol. Symptoms include irritability, heat, thirst, slippery/rapid pulses, and difficult urination/defecation. Treatment prioritizes draining dampness and clearing fire. For damp-heat obstructing lower jiao with persistent shin swelling/pain, modify Fang Ji Yin, or use Cangzhu Huangbai Wan, Er Miao San, or Jia Wei Er Miao Wan. For damp-heat Qi obstruction rushing to chest/abdomen with irritability, restlessness, headache, and dry mouth, use Huo Ren Xijiao San. For damp-heat flowing into meridians causing joint pain, heavy back, and whole-body painful/hot swelling, use Danggui Niantong Tang. For summer-damp invasion with joint pain, fever, thirst, red/scanty urine, Qi deficiency, and shortness of breath, use Qingshu Yiqi Tang. For Liver/Kidney Yin deficiency with blood heat, spine/foot pain, difficulty walking, and difficult urination, use Xuduan Wan.
He further stated: Hong Kong foot with Qi obstruction/rebellion causes panting, fullness, urgency, and upward attack on heart/abdomen, potentially critical. Treatment prioritizes moving stagnation and descending Qi. For upward rushing with chest/abdominal panting and insomnia, use Zisu San, Binglang Tang, or Jiajian Binglang Tang; for severe cases, Si Mo Yin. For panting, abdominal fullness, and leg swelling, use Sangbaipi San or Mutong San. For Qi rising from umbilicus causing chest irritation/restlessness, use Muxiang San or Binglang San. For chest/heart oppression, vomiting, phlegm, and anorexia, use Banxia San or Zisu Tang. For edema, chest/abdominal stuffiness, and difficult urination, use Dafupi San.
He further stated: Hong Kong foot caused by wind-damp combination involves exterior symptoms, alternating chills/fever, panting/cough, wandering pain, or bone/joint pain. Treatment prioritizes dispersing wind, draining dampness, and unblocking meridians. For seasonal wind-epidemic wind-damp or dwelling in damp places causing flaccidity, pain, or alternating chills/fever, use Baidu San. For malaria-like chills/fever with red/swollen/painful areas, use Jia Wei Baidu San. For wind-cold-damp in meridians causing unbearable bone/marrow pain, whole-body pain, aversion to cold, and vomiting, use Wu Ji San (add 3 Scorpions, decoct in wine). For wind-damp stagnation with external Yin cold closure, unresolved exterior, cough, panting, fullness, or chills/fever, use Xiao Qinglong Tang. For wind-damp stagnation causing joint pain and chest/mental oppression, use Dafuzi San. *Qianjin Fang* states: For large/slow pulse, take Xiao Xu Ming Tang for two doses for immediate recovery. *Huo Ren Shu* states: For cold-type Hong Kong foot, add fresh ginger juice to decocted Xiao Xu Ming Tang for fastest effect. For wind-damp excess with fever/cough and limb pain, use Xiongzi Xiangsu San. For wind-damp flow with aversion to cold, fever, no sweat, and aversion to wind, use Mahuang Zuojing Tang.
He further stated: Hong Kong foot includes deficiency patterns. Since Spleen/Stomach/Liver/Kidney meridians originate in the feet, pathogens easily enter via deficiency. Liver deficiency affects sinews; Kidney deficiency affects bones; Spleen deficiency affects flesh; Stomach deficiency affects tendons. Causes include irregular labor/lust, excessive alcohol/dampness, or post-illness maladjustment. Internal deficiency with external Hong Kong foot is a deficiency pattern, requiring regulation and tonification while observing the four pathogens. For Liver/Kidney Yin deficiency with four-pathogen invasion causing paralysis, stiffness, hemiplegia, weak knees/feet, and whole-body pain, use Shenyang Yangzhen Dan, Sanyin Sijin Wan, Tiger Bone Wine, or Ba Wei Dihuang Tang. For severe Spleen/Stomach deficiency with Yin cold below and blocked Yang Qi, use Du Huo Tang or Fuzi Ba Wei Tang. for insufficient essence/blood, lower Yin deficiency, Qi failing to return to essence, and upward rushing of Hong Kong foot to the heart, use Dihuang Tang. For Spleen/Stomach deficiency-cold combined with external wind-damp, use Yin Du Huo Tang or Zhuidu Tang. For Spleen/Kidney deficiency-cold with cough, Qi rebellion, and vomiting, use Nongpo Tang with tonification.
He further stated: Hong Kong foot includes excess pathogens. For severe swelling/pain, constipation, or fullness, treatment prioritizes guiding out and unblocking. For excess wind-damp with swelling/pain, constipation, and abdominal fullness, use Qianghuo Daozhi Tang or Zhishi Dahuang Tang. For four-pathogen flow, Yangming wind-heat, waist/leg swelling/pain, constipation, panting, and abdominal pain, use Dahuang Zuojing Tang. For indigestion, epigastric stuffiness, and leg/foot swelling/pain, use Kaijie Daoyin Wan.
He further stated: For severe swelling/pain, apply external powders to dissipate, use Pepper-Mugwort bags to warm, or wash with aromatic dispelling decoctions. Herbs such as Baicao Jian, Fangfeng, Jingjie, Weilingxian, Aiye, Cangzhu, Shechuangzi, Danggui, and Wuyao are suitable. Single use of Zisu or Honeysuckle Vine (Jinyinhua Teng) decoction for washing is also excellent.
Observing *Huo Ren Shu* etc., some forbid tonics and washing for Hong Kong foot. This is a biased view. Tonics are forbidden only when pathogens obstruct and Qi is excess. Washing is forbidden only when water-damp steam should be avoided. If lower part is deficiency-cold, or post-illness, or over-treated with purgatives, and Hong Kong foot persists, why forbid tonics? For cold-damp/heat obstruction causing swelling/pain, aromatic dispersing decoctions for steaming/washing rapidly expel pathogens. Only when damp-heat rebels upward to chest/heart should washing be delayed to avoid aiding dampness ascent. First descend Qi, wait for toxin to remain in feet, then steam/wash. Tonics strengthen weakness; washing removes stagnation. Why forbid them?
He further stated: Prevention before onset is crucial. *Waitai Miyao* advises: First, avoid anger (causes heart irritability and outbreak); second, avoid loud talking (injures Qi and triggers disease); third, do not expose feet to wind/water or wash with cold water. Calves should not be cold; wear silk in summer, cotton in winter to keep calves/legs warm. Mild sweating is ideal. Following this regimen eliminates Hong Kong foot and prevents pathogen lingering. In summer, pores open; avoid cooling drafts or sitting/lying in cool places. Move joints to ensure smooth Qi flow. This repels pathogens and preserves health. Walk 300-500 steps after meals, stopping when tired, to scatter evil Qi downward. Even with edema, Qi will not rise.
Sun Simiao stated: Ancients rarely had this disease; it became common after the Southern Migration of Yongjia among nobles, caused by internal dampness stagnation. One must not sit/stand long in cold/damp places in any season. Do not undress, wash feet, or seek coolness in wind after drinking/sweating, as these cause Hong Kong foot. Sitting/standing in damp ground during summer steams damp-heat into meridians, causing fever, limb soreness, irritability, edema, and chills/fever. This is common among rural farmers due to external damp injury.
Yang Dashou stated: Hong Kong foot is an obstructive disease; use promoting/unblocking agents to prevent Qi stagnation. Qianghuo Daozhi Tang is generally suitable. Cangzhu, Bai Zhu, Fangji, and Nanxing drain dampness; Qianghuo, Duhuo, Mugua, and Binglang move Qi and benefit joints to remove obstruction; Mutong and Niuxi guide the channels; Danggui and Shengdi harmonize blood. These are essential. Dongyuan's Niantong Tang is also effective. I differentiate and treat based on deficiency/excess and cold/heat, employing flexible methods.
He further stated: Upon early detection of Hong Kong foot, moxa 20-30 cones on the affected area, or use Thunder Fire Needles to guide dampness out, and drink fermented grain liquor to unblock meridians and scatter pathogens. This is the key method. If obstruction forms and pathogens are strong, causing severe swelling/pain/heat, medicines alone may fail; use bloodletting (Bian) to remove bad blood and reduce swelling/heat, followed by herbal treatment.
Ancient texts did not name Hong Kong foot; *Nei Jing* called it Jue; Han Dynasty called it Huan Feng (Slow Wind); Song/Qi Dynasties called it Hong Kong Foot.
*Nei Jing* states: Those injured by dampness are affected first in the lower body. (External onset relates to Foot Shaoyin/Taiyang; internal onset relates to Foot Taiyin/Yangming.)
*Qianjin Fang* discusses: This disease starts in the feet, causing shin swelling, hence named Hong Kong Foot. Classics call it Slow Wind-Damp Bi. Shenshi says: Weak feet implies this meaning. Patients often do not notice immediately; it may trigger after another illness, or sudden dizziness/confusion lasting days before awareness. Untreated, it spreads to limbs, back, head, and neck. Initially subtle, diet/play/strength remain normal, except sudden foot weakness/inability to move. Other signs include heat/confusion, palpitations, irritability, vomiting, cold/fullness below navel, discomfort, scanty urination, differing from usual.
Feng Luzhan stated: Classics say: All dampness, swelling, and fullness belong to Spleen Earth. Also: Dampness affects the lower body first. Spleen governs limbs; feet are low and receive much dampness. Dampness stagnates into heat; damp-heat conflict causes pain. Ancient name was Obstructive Disease; use promoting/unblocking agents like Qianghuo Daozhi Tang or Danggui Niantong Tang to unblock Qi and heal pain. No ancient term for Hong Kong Foot; *Nei Jing* called it Jue; Han Dynasty called it Huan Feng; Song/Qi called it Hong Kong Foot. Swollen cases are Wet Hong Kong Foot (relaxed sinews/vessels, edema); treat by draining dampness and dispersing wind. Non-swollen cases are Dry Hong Kong Foot (dryness/heat, curled/spasmed sinews, withered/non-swollen); treat by moistening blood and clearing dryness. Causes include external infection or internal injury; the nature is damp-heat in both. Northern high/dry regions consume dairy/meat/wine, causing damp-heat flow down. Southern low/damp regions affect those with weak Qi/Blood, or upon encountering...