千金论曰，考诸经方，往往有脚弱之论，而古人少有此疾。自永嘉南度，衣缨土人多有
遭者
此二
余首
峙。
外，
不涉
得。
用水
正
问曰∶风毒中人，随处皆得作病，何偏着于脚也。答曰∶夫人有五脏，心肺二脏，经络
所起
皆
时
凡香港脚病，皆由感风毒所致。得此病多不令人即觉，会因他病一度乃始发动，或奄然大
闷，
不令
缓风
夫有香港脚未觉异，而头项臂膊已有所苦，有诸处皆悉未知，而心腹五内已有所困，又风
毒之中人也，或见食呕吐。憎闻食臭或腹痛下痢，或大小便涩秘不通，或胸中冲悸，不欲见
光明
胫肿
亦
妇
气
顽
凡四时之中，皆不得久立久坐湿冷之地，亦不得因酒醉汗出，脱衣靴袜，当风取凉，皆
成香港脚。若暑月久坐久立湿地者，则热湿之气，蒸入经络，病发必热四肢酸疼烦闷；若寒月
久坐
发则
必不
意于
先中
下
云∶
问曰∶何故得者有冷有热。答曰∶足有三阴三阳，寒中三阳，所患必冷；暑中三阴，所
患必热。故有表里冷热，冷热不同，热者疗以冷药，冷者疗以热药，以意消息之，脾受阳毒
即热
凡小觉病候有异，即须大怖畏，决意疗之，伤缓气上入腹，或肿或不肿，胸胁逆满，气
上肩息，急者死不旋踵，宽者数日必死，不可不急疗也。但看心下急则气喘不停，或白汗数
出，
《千金方》中说，考察各种经典医方，往往有关于“脚弱”的论述，但古人很少患这种病。自从永嘉年间衣冠士族南渡以来，这类疾病在人群中变得非常普遍。
问：风毒侵袭人体，到处都可能发病，为什么偏偏容易集中在脚部呢？答：人的五脏中，心肺两脏的经络起始部位都在上半身，所以风毒容易从上受邪，进而影响下肢。
大凡香港脚病（一种以足胫肿重、软弱无力为主要表现的疾病），都是由感受风毒所致。得了这个病，大多不会让人立刻察觉，往往会因为其他疾病诱发才突然发作，或者突然感到极度烦闷不适。
凡是患有香港脚而尚未察觉明显异常的人，可能头颈、手臂已经感到痛苦；全身各处都还不知晓病情，但心腹五脏内部已经受到困扰。另外，风毒侵袭人体时，可能出现看到食物就呕吐、厌恶闻食物的气味，或者腹痛腹泻，或者大小便涩滞不通，或者心中悸动不安，不想见到光亮，小腿肿胀等症状。
大凡在四季之中，都不久站或久坐于湿冷之地，也不应在酒醉汗出后，脱去衣服鞋袜，对着风取凉，这些都会导致香港脚。如果在暑热月份久坐或久立于湿地，那么湿热之气会蒸腾侵入经络，发病时必定四肢酸疼、烦闷；如果在寒冷月份……（原文此处有缺漏）……必然……（原文此处有缺漏）……意于……（原文此处有缺漏）……先中……（原文此处有缺漏）……下……（原文此处有缺漏）……说：
问：为什么患病的人有的表现为寒证，有的表现为热证？答：足部有三阴经和三阳经，寒气侵袭三阳经，所患疾病必然是寒证；暑气侵袭三阴经，所患疾病必然是热证。所以有表里、冷热之分，冷热不同，热证用寒凉药物治疗，寒证用温热药物治疗，需根据具体情况斟酌处理。脾脏受到阳毒侵袭就会发热……（原文此处有缺漏）
凡是稍微感觉到病症有异样，就必须高度重视，决意进行治疗。如果病势缓滞，气逆上入腹部，或者肿胀或不肿胀，胸胁胀满逆气，气向上冲至肩部呼吸急促，急症者死亡迅速，宽缓者数日内也必死，不可不紧急治疗。只要看心下部急迫则气喘不停，或者冷汗多次渗出，……
The *Qianjin Fang* (Essential Prescriptions Worth a Thousand Gold) states that examining various classic medical formulas, there are often discussions on "Jiao Ruo" (weakness of the legs), yet ancient people rarely suffered from this disease. Since the southward migration during the Yongjia era, many members of the scholarly and official classes have been afflicted by it.
Question: Wind-toxin invading the human body can cause illness anywhere; why does it specifically tend to settle in the feet? Answer: In the human five zang organs, the meridians originating from the Heart and Lung are located in the upper body; therefore, wind-toxin easily invades the lower part, leading to foot lesions.
Generally speaking, Hongxiang Jiao (a disease characterized by swelling and weakness of the lower legs and feet) is caused by contracting wind-toxin. Contracting this disease often does not immediately alert the patient; it usually manifests suddenly due to another illness, or one may suddenly feel extreme oppression and discomfort.
For those suffering from Hongxiang Jiao who have not yet perceived obvious abnormalities, but already experience pain in the head, neck, arms, and elbows; or where the whole body feels fine, but the heart, abdomen, and internal organs are already distressed; additionally, when wind-toxin invades the human body, some present with vomiting upon seeing food, aversion to the smell of food, abdominal pain and diarrhea, or obstruction and constipation of stool and urine, or palpitations and rushing sensations in the chest, aversion to bright light, and swelling of the calves... these are all symptom manifestations.
In any of the four seasons, one should not stand or sit for long periods in damp and cold places, nor should one remove clothes, shoes, and socks while drunk and sweating to cool off in the wind; all these actions can lead to Hongxiang Jiao. If one sits or stands for long periods on wet ground during hot summer months, then heat-damp qi will steam into the meridians; upon onset, the limbs will inevitably ache, accompanied by vexation and oppression. If during cold months... [text fragment] ... must ... intend at ... first struck ... below says:
Question: Why do some patients present with cold syndromes while others present with heat syndromes? Answer: The feet contain three Yin and three Yang meridians. When cold invades the three Yang meridians, the resulting condition is necessarily cold; when summer-heat invades the three Yin meridians, the resulting condition is necessarily heat. Thus, there are differences in exterior-interior and cold-heat natures. Heat syndromes are treated with cold medicines, and cold syndromes are treated with hot medicines, requiring careful judgment based on the specific situation. When the Spleen is affected by Yang-toxin, it becomes hot...
Whenever one slightly perceives an abnormality in symptoms, one must be greatly alarmed and resolve to treat it. If the condition is slow, pathogenic qi enters the abdomen; whether swollen or not, there is rebellious fullness in the chest and hypochondrium, and qi rushes upward to the shoulder causing rapid breathing. In acute cases, death occurs swiftly; in chronic/slow cases, death occurs within several days. It is imperative to treat urgently. One need only observe if there is urgency beneath the heart with ceaseless panting, or profuse white sweat...