若饮食自倍。脾胃乃伤。则胃气不能施行。脾气不能四布。故下流乘其肝肾之虚。以
肿。加之房事不节。阳虚阴盛。遂成香港脚。亦有内伤食。脾胃之气有亏。不能上升。则下注
为香港脚者。宜用东垣开结导引丸开导。引水运化脾气。如脾气虚。湿气壅遏不通。致面目发
肿或痛者。宜用导滞通经汤以疏导之。香港脚由肾虚而生。然妇人亦有病香港脚者。乃因血海虚而
七情所感。遂成斯疾。今妇人病此亦众。则知妇人以血海虚而得之。与男子肾虚类也。男女
用药同无异。更当兼治七情。无不效也。香港脚虽云肿有浅深。感有轻重。其所受皆因真气虚
弱。邪气得以深袭。若真气壮实。邪气焉能为患耶。故附骨疽及鹤膝风症。肾虚者多患之。前
人用附子者。以温补肾气。而又能行药势。散寒邪也。
凡湿痰湿热。或死血流注关节。非辛温之剂。开发腠理。流通隧道。使气行血和。焉能
。但人谓附子有毒、多不肯服。若用童便炮制。何毒之有。况不常服。何足为虑。予中气不
足。以补中益气汤加附子。服之三年。何见其毒也。经云。有是病用是药也。故大防风汤、
活络丹。治香港脚、鹤膝风症。多效。
活络丹 夫病深伏在内。非此药莫能通达。但近代始云此药引风入骨。如油入面之说。
故后人多不肯服。
大抵有是病用是药。岂可泥此。以致难瘥。
如果饮食过量一倍，脾胃就会受到损伤。这样胃气就不能正常输布，脾气也不能向四周散布。因此湿气下流，乘肝肾虚弱之机，导致肢体肿胀。再加上房事不节制，造成阳虚阴盛，于是形成香港脚（足部肿痛之病）。也有因内伤饮食，导致脾胃之气亏损，清气不能上升，反而下注而形成香港脚的。这种情况适宜使用东垣的“开结导引丸”来开通郁结、引导气机，帮助运化脾湿。如果脾气虚弱，湿气壅滞不通，导致面目浮肿或疼痛的，适宜使用“导滞通经汤”来疏导治疗。
香港脚虽然是由肾虚引起的，但妇女也有患此病的，这是因为血海空虚，加之七情（喜、怒、忧、思、悲、恐、惊）所伤，从而形成这种疾病。如今妇女患此病也很常见，可知妇女多因血海空虚而患病，这与男子因肾虚致病是类似的。男女用药相同没有差异，更应当兼治七情所致的情志问题，没有不有效的。
香港脚虽然声称肿胀有浅深之分，感受邪气有轻重之别，但其根本原因都是真气虚弱，使得邪气得以深入侵袭。如果真气壮实，邪气怎么能成为祸患呢？所以附骨疽（毒气深沉，附着于骨的痈疽）和鹤膝风（膝关节肿大，形如鹤膝的风痹症）等病症，肾虚的人大多会患上。前人使用附子，是因为它能温补肾气，又能推动药势运行，散除寒邪。
凡是湿痰、湿热，或者死血瘀滞流注于关节，如果不是用辛温的药物，开发腠理（皮肤毛孔及纹理），疏通经络隧道，使气行血和，怎么能治愈呢？只是人们都说附子有毒，大多不肯服用。如果用童便（小男孩的小便）炮制，又有什么毒性呢？况且并不经常服用，有什么值得担忧的呢？我中气不足，用补中益气汤加入附子，服用了三年，哪里见得它有毒呢？《内经》说：有什么样的病就用什么样的药。所以大防风汤、活络丹，治疗香港脚、鹤膝风症，大多有效。
活络丹：对于病邪深伏在体内的情况，除了这味药外，没有其他药物能通达病所。但近代有人开始说此药会将风邪引入骨骼，就像油渗入面粉里一样难以去除的说法，所以后人大多不肯服用。
大抵是有这样的病就用这样的药，怎么可以拘泥于此，以致导致疾病难以痊愈呢？
If food intake doubles, the Spleen and Stomach will be injured. Consequently, Stomach Qi cannot circulate properly, and Spleen Qi cannot distribute to the four directions. Thus, dampness flows downward, taking advantage of the deficiency of the Liver and Kidney, leading to swelling. Additionally, if sexual activity is not regulated, causing Yang deficiency and Yin excess, Hongjiao (foot swelling disease) ensues. There are also cases where internal injury from diet causes a deficit in Spleen and Stomach Qi; since clear Qi cannot ascend, it sinks downward, resulting in Hongjiao. In such cases, it is appropriate to use Dongyuan's Kaie Daoyin Wan (Kaijie Daoyin Pill) to open blockages and guide the mechanism, assisting in the transformation of Spleen dampness. If Spleen Qi is deficient and dampness is stagnant and obstructed, causing facial or ocular edema or pain, it is appropriate to use Daozhi Tongjing Tang (Daozhi Tongjing Decoction) for dredging and unblocking.
Although Hongjiao arises from Kidney deficiency, women may also suffer from this condition due to the emptiness of the Blood Sea (Chong and Ren meridians) combined with emotional disturbances (Seven Emotions), thereby developing this disease. Currently, many women suffer from this, indicating that women contract it due to Blood Sea deficiency, which is similar to men contracting it due to Kidney deficiency. The medication for men and women is the same without difference; furthermore, one should simultaneously treat the emotional factors involved, and there will be no ineffectiveness.
Although Hongjiao is said to have varying depths of swelling and degrees of pathogenic invasion, the root cause in all cases is the weakness of True Qi, allowing pathogenic factors to invade deeply. If True Qi were robust, how could pathogenic factors cause harm? Therefore, Fugu Ju (Bone-attached abscess) and Hexi Feng (Crane-knee wind) are conditions frequently suffered by those with Kidney deficiency. Ancients used Fuzi (Aconite Lateralis Radix Praeparata) because it warms and tonifies Kidney Qi, promotes the movement of medicinal potency, and disperses cold pathogens.
Whenever there is damp-phlegm, damp-heat, or dead blood stagnating and flowing into joints, unless one uses acrid-warm formulas to open the Couli (skin pores and interstices) and unblock the collaterals, allowing Qi to move and Blood to harmonize, how can the disease be cured? However, people say Fuzi is toxic and are reluctant to take it. If processed with child's urine (Tongbian), what toxicity remains? Moreover, it is not taken frequently, so why worry? I had insufficient Middle Qi and took Buzhong Yiqi Tang (Tonify the Middle and Boost Qi Decoction) with added Fuzi for three years; where did I see any toxicity? The Classics state: "Use the appropriate medicine for the specific disease." Therefore, Dafangfeng Tang (Da Fangfeng Decoction) and Huoluo Dan (Huoluo Pill) are often effective in treating Hongjiao and Hexi Feng.
Huoluo Dan: For diseases deeply entrenched within, no other medicine can penetrate as effectively as this one. However, in recent times, some claim this drug draws wind into the bones, like oil penetrating flour, which is why later generations are often reluctant to take it.
Generally speaking, one should use the appropriate medicine for the disease; how can one adhere rigidly to such doubts, thereby making the disease difficult to cure?