人病香港脚与气脚有异者，即邪毒从内而注入脚者，名曰香港脚。风寒暑湿邪毒之气从外而
入于脚膝者，名气脚也。皆以邪夺其正，使人病形，颇相类似。其于治疗，亦有上下先后。
若不察其理，无由致其瘳也。又喜怒忧思寒热毒邪之气，流入肢节，或注于膝脚，其状类诸
风、历节、偏枯、痈肿之证，但入并脚膝者谓之气脚。若从外入足入脏者，谓之香港脚。香港脚
者，先治外而次治内，实者利之，虚者益之。又病香港脚多者，何也？谓人之心肺二经起于手，
脾肾肝三经起于足，手则清邪中之，足则浊邪中之，人身之苦者手足耳，而足则最重艰苦，
故风寒暑湿之气，多中于足，以此香港脚病多也。然而得之也以渐，始误于不明。医家不视为
香港脚，而目为别疾，治疗不明，因循至大，身居厄矣。本从微起，渐成巨候，流入脏腑，伤
于四肢，头项腹背未甚，终不能知觉也。时因地而作，或如伤寒，或如中暑，或腹背疼痛，
或肢节不仁，或语言错乱，或精神昏昧，或时喘乏，或暴盲聋，或饮食不入，或脏腑不通，
或挛急不遂，或舒缓不收，或口眼牵搐，或手足颤震，种种多状，莫有达者。故使愚俗束手
受病，死无告疗。仁者见之，岂不伤哉？今始述本末，略示后学。如醉入房中，饱眠露下，
当风取凉，对月贪欢，沐浴未干而熟睡，房室才罢而冲风，久立于低湿，久伫于水湿，冒雨
而行，清寒而寝，劳伤汗出，食欲悲生，犯诸所禁，因成疾矣。其于不正之气，中于上则害
于头目，害于中则蛊于心腹，形于下则失于腰脚，及于旁则妨于肢节，千状万证，皆属气脚。
起于脚膝，乃谓香港脚也。形候脉理，亦在详明。其脉浮而弦者，起于风，濡而弱者起于湿，
洪而数者起于热，迟而涩者起于寒，滑而微者起于虚，牢而坚者起于实。在于上则由于上，
在于下则发于下，在于中则发于中，结则因气，散则因忧，聚则因怒，细则因悲。风者汗而
愈，湿者温而愈，热者解而愈，寒者熨而愈。虚则补之，实则泻之，气则流之，忧则宽之，
怒则悦之，悲则和之，能通斯方，谓之良医。香港脚之病，传于心肝，十死不治。入于心则恍
惚妄谬，呕吐食不入，眠不安定，左手寸口脉乍大乍小，乍有乍无者是也。入肾即腰脚俱肿，
小便不通，呻吟不绝，目额皆黑
患有香港脚（一种以足部肿胀、疼痛或麻木为主要表现的疾病，古称“脚气”）与气脚（由气机逆乱引起的足部病症）是不同的。邪毒从体内注入脚部的，称为香港脚；风寒暑湿等邪毒之气从外部侵入脚膝部位的，称为气脚。这两种病都是因为邪气剥夺了正气，导致人体出现病态，症状颇为相似。但在治疗上，也有区分上下、先后缓急的不同。如果不明辨其病理机制，就无法使疾病痊愈。
此外，喜怒忧思以及寒热毒邪之气，流入肢体关节，或者注于膝盖和脚部，其症状类似于各种风证、历节病（关节剧烈疼痛变形）、偏枯（半身不遂）、痈肿等病症，但只要病邪汇聚于脚膝部位，就称为气脚。如果病邪从外部进入足部并深入内脏的，则称为香港脚。对于香港脚的治疗，应当先治外而后治内，实证用通利法，虚证用补益法。
那么，为什么患香港脚的人这么多呢？这是因为人的心肺两条经脉起始于手部，脾肾肝三条经脉起始于足部。手容易受到清邪（轻清之邪）侵袭，足容易受到浊邪（重浊之邪）侵袭。在人体的苦痛中，手足耳最为辛苦，而足部承受的艰苦最重，所以风寒暑湿之气多侵袭足部，因此香港脚发病较多。
然而，这种病是逐渐形成的，起初是因为人们不明病因而误判。医生不将其视为香港脚，而看作其他疾病，治疗不明确，因循拖延直到病情严重，患者才陷入困境。本从轻微开始，逐渐发展成巨大的病候，流入脏腑，损伤四肢，头项腹背等症状尚不明显时，最终无法察觉。
此病随时间和地域不同而发作，有时像伤寒，有时像中暑，或者腹背疼痛，或者肢体关节麻木不仁，或者言语错乱，或者精神昏沉，或者时而气喘乏力，或者突然失明失聪，或者饮食不进，或者脏腑不通畅，或者筋脉拘挛不能随意运动，或者肌肉松弛无法收摄，或者口眼歪斜抽搐，或者手足颤抖震动，种种症状繁多，没有通达医理的人能完全理解。这使得愚昧世俗之人束手无策，只能忍受病痛，死亡时无处求医。仁爱的人看到这种情况，难道不感到悲伤吗？
现在我开始阐述疾病的始末，简要示教后学。比如醉酒后进行房事，饱食后露天睡觉，迎风取凉，对着月亮贪恋欢爱，沐浴后未干就熟睡，房事刚结束就吹到风，长时间站立在低洼潮湿处，长时间停留在水湿之地，冒雨行走，穿着清寒衣物睡觉，劳累出汗后受惊悲生，触犯各种禁忌，因而形成疾病。
那些不正之气，侵犯上部则伤害头目，侵犯中部则蛊惑心腹，侵犯下部则导致腰脚失用，侵犯旁侧则妨碍肢节。千种万种证候，都属于气脚范畴。起于脚膝的，才称为香港脚。形态征候和脉理，也需要详细阐明。
脉象浮而弦的，起于风邪；濡而弱的，起于湿邪；洪而数的，起于热邪；迟而涩的，起于寒邪；滑而微弱的，起于虚证；牢而坚硬的，起于实证。病在上部则源于上部，病在下部则发于下部，病在中部则发于中部。脉结代是因气滞，脉散乱是因忧愁，脉聚拢是因愤怒，脉细弱是因悲伤。
风邪致病需发汗而愈，湿邪致病需温煦而愈，热邪致病需解表清热而愈，寒邪致病需熨烫温通而愈。虚证则补益它，实证则泻除它，气滞则行气导引它，忧愁则宽慰疏导它，愤怒则愉悦安抚它，悲伤则调和抚慰它。能够通晓这些方法，才称为良医。
香港脚之病，若传变至心肝二脏，十有八九死亡且难以治愈。病邪入心，则出现恍惚妄谬、呕吐、饮食不入、睡眠不安定，左手寸口脉忽大忽小、忽有忽无，这就是入心的表现。病邪入肾，则腰脚俱肿，小便不通，呻吟不止，眼眶和额头皆黑。
Individuals suffering from Hongxiangjiao (a disease characterized by swelling, pain, or numbness in the feet, historically referred to as "Jiaqi" or foot qi) differ from those with Qijiao (foot disorders caused by rebellious Qi). When pathogenic toxins inject into the feet from within, it is named Hongxiangjiao. When pathogenic factors such as Wind-Cold, Summerheat, and Dampness enter the feet and knees from the exterior, it is named Qijiao. Both conditions result from pathogens depriving the body of Zhengqi (Upright Qi), causing similar pathological manifestations. However, treatment requires distinguishing between upper and lower levels and prioritizing urgency. Without understanding the underlying principles, recovery cannot be achieved.
Furthermore, emotions such as anger, joy, worry, and sorrow, along with Cold-Heat toxic pathogens, may flow into the limb joints or accumulate in the knees and feet. Their symptoms resemble various Wind syndromes, Lijie syndrome (severe joint pain and deformity), Piangu (hemiplegia), and Yongzhong (abscesses/swellings). Yet, if the pathology converges on the feet and knees, it is termed Qijiao. If pathogens enter from the exterior through the feet and penetrate the Zang-Fu organs, it is termed Hongxiangjiao. Treatment for Hongxiangjiao should address the exterior first and the interior subsequently; excess patterns are treated with purgation/drainage, while deficiency patterns are treated with tonification.
Why are there so many cases of Hongxiangjiao? The Heart and Lung meridians originate in the hands, while the Spleen, Kidney, and Liver meridians originate in the feet. Hands are susceptible to Qingxie (Clear/Light pathogens), whereas feet are susceptible to Zhuoxie (Turbid/Heavy pathogens). Among the body parts that endure hardship, the hands, feet, and ears are most taxed, with the feet bearing the heaviest burden. Therefore, Wind-Cold, Summerheat, and Dampness frequently attack the feet, leading to a higher incidence of Hongxiangjiao.
However, this disease develops gradually, initially due to ignorance of its etiology. Physicians often fail to recognize it as Hongxiangjiao, misdiagnosing it as other ailments. Unclear treatments and delayed interventions allow the condition to worsen, leaving patients in dire straits. Starting subtly, it progresses to severe manifestations, invading the Zang-Fu organs and damaging the four limbs. Early symptoms in the head, neck, abdomen, and back may be mild, leading to a lack of awareness until it is too late.
The disease manifests according to time and geography, sometimes resembling Shanghan (Cold Damage), sometimes Zhongshu (Summerheat Stroke), or presenting with abdominal and back pain, numbness in the limbs and joints, disordered speech, mental confusion, occasional asthma and fatigue, sudden blindness or deafness, inability to eat, obstruction of the Zang-Fu organs, muscle spasms and immobility, flaccidity and loss of control, facial deviation and twitching, or trembling of the hands and feet. These myriad symptoms are often misunderstood by those lacking medical insight. Consequently, ignorant people suffer helplessly, dying without access to proper treatment. Would not benevolent physicians feel sorrow upon witnessing this? I now recount the origins and progression of this disease to instruct future students.
Causes include engaging in sexual activity after drunkenness, sleeping outdoors after overeating, cooling off in the wind, indulging in pleasure under the moon, falling asleep deeply before drying off after bathing, exposing oneself to wind immediately after intercourse, standing long in low and damp areas, lingering in wet environments, walking in the rain, sleeping in cold conditions, sweating from exertion followed by emotional distress, and violating dietary or lifestyle prohibitions. Such actions invite pathogenic Qi. If this abnormal Qi attacks the upper part, it harms the head and eyes; if it attacks the middle, it disrupts the Heart and Abdomen; if it attacks the lower part, it causes dysfunction in the waist and feet; if it attacks the sides, it impedes the limbs. All these myriad manifestations belong to Qijiao. Those originating in the feet and knees are specifically called Hongxiangjiao. Morphological signs and pulse characteristics must also be clearly understood.
A floating and wiry pulse indicates origin from Wind; a soggy and weak pulse indicates origin from Dampness; a surging and rapid pulse indicates origin from Heat; a slow and choppy pulse indicates origin from Cold; a slippery and faint pulse indicates origin from Deficiency; a firm and hard pulse indicates origin from Excess. Pathology in the upper part stems from the upper; pathology in the lower part erupts from the lower; pathology in the middle erupts from the middle. A knotted pulse arises from Qi stagnation; a scattered pulse arises from Worry; a gathered pulse arises from Anger; a thin pulse arises from Sorrow.
Wind-induced diseases are cured by inducing sweating; Damp-induced diseases are cured by warming; Heat-induced diseases are cured by resolving/clearing; Cold-induced diseases are cured by moxibustion/warming packs. Deficiency is treated by tonifying; Excess is treated by draining; Qi stagnation is treated by promoting circulation; Worry is treated by soothing/broadening; Anger is treated by pleasing/calming; Sorrow is treated by harmonizing. One who masters these methods is considered a good physician.
If Hongxiangjiao transmits to the Heart and Liver, ten out of ten cases are fatal and incurable. When entering the Heart, symptoms include mental confusion, delirium, vomiting, inability to eat, and restless sleep. The Cun Kou pulse on the left hand becomes irregular—alternating between large and small, present and absent. When entering the Kidney, both the waist and feet swell, urination is obstructed, groaning is incessant, and the eye sockets and forehead turn black.