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，羌活、独活、木瓜、槟榔，行气利关节以去壅，佐木
通、牛膝以引经，当归、生黄地以和血，此必用之药也。又如东垣拈痛汤之类亦甚捷，余因
证之虚实而辨治之，此即通变活法也。
薛氏治一男子，素有香港脚，胁下作痛，发热，头晕呕吐，腿痹不仁，服消毒、护心等药
不应。左关脉紧，右关脉弦，此亦香港脚也。以半夏左经汤治之而愈。一男子脚软肿痛，发热
饮冷，大小便秘，右关脉数，乃足阳明经湿热流注也，以大黄左经汤治之而愈。一妇人肢节
肿痛，胫足尤甚，时或自汗，或头痛，此太阳经湿热所致。用麻黄左经汤二剂而愈。一男子
两腿肿痛，脉滑而数，此湿痰所致也。先以五苓散加苍术、黄柏，二剂少愈，更以二陈、二
术、槟榔、紫苏、羌活、独活、牛膝、黄柏而瘥。夫湿痰之证，必先以行气利湿健中为主，
若中气和则痰自消，而湿亦无所容矣。一男子右腿赤肿 痛，脉沉数，用当归拈痛汤。
四肢反痛，乃湿毒壅遏，又况下部药不易达，非药不对证也。遂砭患处，去毒血，仍用前药
，一剂顿减，又四剂而消。一妇人患香港脚，或时腿肿筋挛，腹作痛，诸药不应，渐至危笃。
诸书云∶八味丸治足少阴香港脚入腹，疼痛上气，喘促欲死者，遂投，一服顿退，又服而愈。
凡肾经虚寒之人，多有此患，乃肾乘心，水克火之证，少缓则死不旋踵，宜急服之。一妇人
患腿痛不能伸屈，遇风寒痛益甚，诸药不应，甚苦。先以活络丹一丸，顿退，又服而瘳。次
年复痛，仍服一丸，亦退大半，更以独活寄生汤，四剂而愈。一男子素有香港脚，又患附骨痈
作痛，服活络丹一丸，二证并瘥。上舍俞鲁月，素有疝不能愈，因患腿痛，亦用活络丹一丸
，不惟腿患有效，而疝亦得愈矣。留都金二守女，患惊风甚危，诸医皆不能救。遂自用活络
丹，一丸即愈，且不再作。夫病邪深伏在内，非此药莫能通达。但近代有云此药引风入骨，
如油面之说，故后人多不肯服，大抵有是病宜用是药，岂可泥于此言，致病难瘥。
杨大受说：香港脚（足部肿痛之病）属于壅滞不通的疾病，应当使用宣通类的方剂，使气机不再形成壅滞。比如羌活导滞汤之类的方子，适宜普遍使用。又如用苍术、白术、防己、天南星来祛除湿邪，用羌活、独活、木瓜、槟榔来行气并疏通关节以消除壅滞，佐以木通、牛膝作为引经药，再用当归、生地黄来调和血液，这些都是必须使用的药物。又比如东垣的拈痛汤之类也非常见效，我根据病症的虚实进行辨证治疗，这就是灵活变通的治法。
薛氏治疗一名男子，素来患有香港脚，胁下疼痛，发热，头晕呕吐，腿部麻木不仁，服用消毒、护心等药物无效。诊得左关脉紧，右关脉弦，这也是香港脚。用半夏左经汤治疗而痊愈。另一名男子脚部软弱肿痛，发热且想喝冷饮，大小便闭塞，右关脉数，这是足阳明经湿热流注所致，用大黄左经汤治疗而痊愈。一名妇女肢节肿痛，小腿和足部尤为严重，有时自汗，有时头痛，这是太阳经湿热引起的。用麻黄左经汤两剂后痊愈。一名男子双腿肿痛，脉象滑而数，这是湿痰所致。先用五苓散加苍术、黄柏，服两剂后稍见好转，再用二陈汤、二术（苍术、白术）、槟榔、紫苏、羌活、独活、牛膝、黄柏而病愈。凡是湿痰的证候，必须先以行气利湿、健运中焦为主，如果中气调和了，痰自然消散，湿气也就无处容身了。一名男子右腿红肿疼痛，脉沉数，用当归拈痛汤。四肢反而疼痛，这是因为湿毒壅遏，况且下部用药不易到达病所，并非药不对证。于是用砭石刺破患处，放出毒血，仍然用前面的药物，一剂后症状顿减，又服四剂而消退。一名妇女患香港脚，有时腿部肿胀筋脉拘挛，腹部作痛，各种药物无效，逐渐发展到危重地步。各书说：八味丸治疗足少阴肾经香港脚入腹，疼痛上冲，气喘急促欲死之症，于是投予此药，一服后症状顿时减退，再服而痊愈。凡是肾经虚寒的人，多有这种病患，这是肾水乘袭心火，水克火的证候，稍微迟缓则死亡就在眨眼之间，应当急服此药。一名妇女患腿痛不能伸屈，遇到风寒疼痛更加严重，各种药物无效，非常痛苦。先用活络丹一丸，症状顿时减退，再服而痊愈。次年复发疼痛，仍服一丸，也退去大半，再用独活寄生汤，四剂后痊愈。一名男子素来患有香港脚，又患附骨痈作痛，服用活络丹一丸，两种病症同时痊愈。上舍俞鲁月，素来患有疝气不能治愈，因患腿痛，也用活络丹一丸，不仅腿部的病痛有效，疝气也得以痊愈了。留都金二守的女儿，患惊风非常危险，各位医生都不能救治。于是她自己服用活络丹，一丸即愈，并且不再发作。凡是病邪深伏在内，不是这个药就不能通达。但近代有人说此药会“引风入骨”，像油面一样（指难以清除或加重病情），所以后人多不肯服用，大体上有这种病就应当用这种药，怎么能拘泥于这种说法，导致疾病难以治愈呢。
Yang Dashou said: Hong Kong jiao (a disease characterized by swelling and pain in the lower limbs) is a condition of stagnation and obstruction. It should be treated with agents that promote circulation and unblocking, so that qi does not become stagnant. For example, decoctions such as Qianghuo Daozhi Tang are suitable for general use. Furthermore, using Cang Zhu (Atractylodis Rhizoma), Bai Zhu (Atractylodis Macrocephalae Rhizoma), Fang Ji (Stephaniae Tetrandrae Radix), and Nan Xing (Arisomatis Tuber) to eliminate dampness; Qiang Huo (Notopterygii Rhizoma et Radix), Du Huo (Angelicae Pubescentis Radix), Mu Gua (Chaenomelis Fructus), and Bing Lang (Arecae Semen) to move qi and benefit the joints to remove obstruction; supplemented by Mu Tong (Akebiae Caulis) and Niu Xi (Achyranthis Bidentatae Radix) as guiding herbs; and Dang Gui (Angelicae Sinensis Radix) and Sheng Di Huang (Rehmanniae Radix) to harmonize blood—these are essential medications. Additionally, formulas such as Dian Yuan's Niantsong Tang are also very effective. I differentiate and treat based on the deficiency or excess of the syndrome, which constitutes flexible and adaptive treatment methods.
Xue treated a male patient who had a history of Hong Kong jiao, presenting with pain under the hypochondrium, fever, dizziness, vomiting, and numbness and loss of sensation in the legs. Medications such as Xiaodu (detoxification) and Huxin (heart protection) were ineffective. The pulse at the left Guan position was tight, and the right Guan position was wiry, indicating this was also Hong Kong jiao. He was cured using Banxia Zuojing Tang. Another male patient presented with weakness, swelling, and pain in the feet, fever, craving for cold drinks, and constipation of both urine and stool. The pulse at the right Guan position was rapid, indicating damp-heat flowing into the Foot Yangming Meridian. He was cured using Dahuang Zuojing Tang. A female patient presented with swelling and pain in the joints, particularly severe in the shins and feet, accompanied by spontaneous sweating or headache from time to time, caused by damp-heat in the Taiyang Meridian. She was cured after two doses of Mahuang Zuojing Tang. A male patient presented with swelling and pain in both legs, with a slippery and rapid pulse, caused by damp-phlegm. Initially, Wuling San combined with Cang Zhu and Huang Bo was administered for two doses, resulting in slight improvement. Subsequently, Erchen Tang, Er Zhu (Cang Zhu and Bai Zhu), Bing Lang, Zi Su, Qiang Huo, Du Huo, Niu Xi, and Huang Bo were used, leading to recovery. In cases of damp-phlegm syndromes, the primary treatment must focus on moving qi, promoting diuresis to resolve dampness, and strengthening the middle jiao. Once the middle qi is harmonized, phlegm will naturally dissipate, and dampness will have no place to reside. A male patient presented with redness, swelling, and pain in the right leg, with a deep and rapid pulse. Danggui Niantsong Tang was prescribed. However, pain in all four limbs worsened due to the entrapment of damp-toxin. Moreover, medicines intended for the lower body may not easily reach the affected area; this was not a mismatch of medicine and syndrome. Therefore, bianshi (stone acupuncture) was applied to the affected area to drain toxic blood, and the previous prescription was continued. Symptoms decreased significantly after one dose and resolved after four additional doses. A female patient suffered from Hong Kong jiao, with intermittent leg swelling and tendon spasms, abdominal pain, and resistance to various medications, progressing to a critical state. Classical texts state that Bawei Wan treats Kidney Meridian Hong Kong jiao entering the abdomen, causing pain, upward rushing of qi, and severe asthma suffocating the patient. Thus, it was administered, resulting in immediate relief after one dose and full recovery after subsequent doses. Individuals with Kidney Meridian deficiency-cold often suffer from this condition, representing a pattern where Kidney Water overacts on Heart Fire (Water overcoming Fire). Delay could lead to imminent death, so urgent administration is required. A female patient suffered from leg pain preventing flexion and extension, worsening upon exposure to wind and cold, and resistant to various medications, causing great distress. One pill of Huoluo Dan was administered first, resulting in immediate relief, followed by further doses leading to recovery. The following year, the pain recurred. One pill was taken again, reducing symptoms by more than half, and subsequently, Duhuo Jisheng Tang was administered for four doses, resulting in complete cure. A male patient with a history of Hong Kong jiao also developed an osteomyelitis (bone abscess) causing pain. One pill of Huoluo Dan cured both conditions simultaneously. Yu Luyue, a scholar-official, had an incurable hernia. When he developed leg pain, he also took one pill of Huoluo Dan. Not only did it effectively treat the leg condition, but the hernia was also cured. The daughter of Jin Eshou, residing in the capital, suffered from severe convulsive disorders (Jing Feng) in a critical condition, beyond the remedy of various physicians. She self-administered one pill of Huoluo Dan and recovered immediately, with no recurrence. When pathogenic factors are deeply entrenched internally, no other medication can penetrate them as effectively. However, modern practitioners claim that this drug "draws wind into the bones," likening it to oil mixing with dough (implying difficulty in removal or exacerbation). Consequently, many later generations refuse to take it. Generally, if there is a specific disease, the corresponding medicine should be used. How can one rigidly adhere to such statements, thereby making the disease difficult to cure?