朱丹溪曰∶大风病是受得天地间杀物之风。古人谓之厉风者，以其酷烈暴悍可畏耳。人得之者，须分在上
在下。夫在上者，以醉仙散取臭涎恶血于齿缝中出；在下者，以通天再造散取恶物陈虫于谷道中出。所出虽
有上下道路之殊，然皆不外乎阳明一经。治此病者，须知此意，看其疙瘩与疮。若上先见者，上体多者，在
上也；若下先见者，下体多者，在下也。上下同得者，在上复在下也。阳明胃经与大肠，无物不受，此风之
入人也，气受之则在上多，血受之则在下多，气血俱受者甚重。
古人谓大风疾三因五死。三因者，一曰风毒，二曰湿毒，三曰传染。五死者，一曰皮死，麻木不仁；二曰
脉死，血溃成脓；三曰肉死，割切不痛；四曰筋死，手足纵缓；五曰骨死，鼻梁崩塌，与夫眉落眼昏，唇翻声
噎，甚可畏也。所以然者，由邪正交攻，气血沸腾，而湿痰死血，充满于经络之中，故生虫生疮，痛痒麻木也
。
夫从上从下，皆是可治之病。人见病势之缓，多忽之。治疗大法，内通脏腑，外发经络，按法施治，亦
须首尾断酒戒色，忌食发风动气、荤腥盐酱、炙爆生冷之物，消心寡欲，方得无虞也。
喻嘉言曰∶凡治厉风之法，以清营卫为主。其汗宜频发，血宜频刺，皆清营卫之捷法也。生虫由于肺热，
其清肃之令不行，故由皮毛渐及腠理肠胃、莫不有虫。消其金，则虫不驱自熄。试观金风一动，旱魃绝踪，其
理明矣。然清肺亦必先清营卫之气，盖营卫之气腐而不清，传入于肺，先害其消肃之令故也。苦药虽能泻肺
杀虫，亦能伤胃，不可久服。胃者，营卫从出之源也，久服苦寒，腐败壅郁，不可胜言矣。所以苦参丸之类，
营卫素弱谷食不充之人，不宜久服也。大枫子油最能杀虫驱风，然复过于辛热，风未除而自先坏者多矣。
其硫黄酒，服之必致脑裂之祸。又醉仙散入轻粉和末，日进三服，取其人昏昏苦醉，毒涎从齿缝中出，疠未除
而齿先落矣。盖除疠之药，服之近而少，疠必不除；服之久且多，疠虽除，药之贻害更大。惟易老驱风丸、东
坡四神丹二方，可久服。且非极意惩创之人，不可与治也。
鹤膝风，即风寒湿之痹于膝者也。如膝骨日大，上下肌肉日枯细者，且未可治其膝，先养血气，俾肌肉
渐营后，治其膝可也。此与治左右半身偏枯之症大同。夫既偏枯矣，急溉其未枯者，然后既枯者得以通气而复
营。倘不知从气引血，从血引气之法，但用麻黄、防风等散风之劫药，鲜不有全枯而速死者。故治鹤膝风而
亟攻其痹，必并其足痿不用矣。
古方治小儿鹤膝风，用六味加鹿茸、牛膝，共八味。不治其风，其意最善。小儿非必为风寒湿所痹，多
因先天所禀肾气衰薄，阴寒凝聚于腰膝而不解，从外可知其内也。故以
六味丸补肾中之水，以鹿茸补肾中之火，以牛膝引至骨节，而壮裹撷之筋，此治本不治标之良法也，举
此为例。
朱丹溪说：大风病是感染了天地间具有杀伤力的风邪。古人称之为厉风，是因为这种风邪酷烈暴悍、令人畏惧。人感染此病后，必须区分病位在上部还是下部。病位在上部的，用醉仙散促使恶臭的痰涎和瘀血从齿缝中排出；病位在下部的，用通天再造散促使恶物和陈旧的虫体从肛门排出。虽然排出的途径有上下之分，但都不外乎阳明经这一条路径。治疗此病的人，必须明白这个道理，观察患者身上的疙瘩和疮疡。如果症状先在身体上部出现，或上部症状较多，则病位在上；如果症状先在身体下部出现，或下部症状较多，则病位在下；上下同时出现的，则是病位既在上又在下。阳明胃经与大肠，无所不纳，风邪侵入人体，若气分先受邪则病位多在上，若血分先受邪则病位多在下，气血俱受邪的病情最为严重。
古人认为大风疾有三因五死之说。三因是指：一是风毒，二是湿毒，三是传染。五死是指五种危重证候：一是皮死，表现为皮肤麻木不知痛痒；二是脉死，表现为血液溃烂化脓；三是肉死，表现为肌肉割切时不觉疼痛；四是筋死，表现为手足松弛无力；五是骨死，表现为鼻梁崩塌，以及眉毛脱落、眼睛昏花、嘴唇翻卷、声音嘶哑且吞咽困难，这些情况都非常可怕。之所以会出现这种情况，是因为邪气与正气相互交攻，气血沸腾，导致湿痰和死血充满在经络之中，从而生出虫子和疮疡，引起疼痛、瘙痒和麻木。
无论是从上治还是从下治，都是可治之病。人们看到病势发展缓慢，往往忽视它。治疗的大法，是内通脏腑，外发经络，按照法则进行治疗。同时也必须从头到尾戒酒禁欲，忌食诱发风邪、动气以及荤腥、盐酱、烧烤油炸、生冷等食物，减少欲望，才能确保没有危险。
喻嘉言说：凡是治疗厉风的方法，以清养营卫为主。汗液应当频繁发出，血液应当频繁刺络，这都是清养营卫的快捷方法。生虫是由于肺热，其清肃的功能不能正常行使，所以病邪由皮毛逐渐波及腠理、肠胃，无处没有虫子。清除肺金的热邪，则虫子不驱自灭。试看金风一动，旱魃（干旱之神）绝迹，其中的道理就很明白了。然而清肺也必须先清营卫之气，因为营卫之气腐败不清，传入于肺，首先损害了肺的清肃功能。苦寒药物虽然能泻肺杀虫，但也损伤胃气，不可久服。胃是营卫生成的源头，长期服用苦寒药物，会导致胃气腐败壅滞，后果不堪设想。所以像苦参丸这类药物，对于营卫素来虚弱、饮食不足的人，不宜久服。大枫子油最能杀虫驱风，但它过于辛热，往往风邪未除，身体反而先被损坏。硫黄酒，服用后必然导致脑部破裂的灾祸。还有醉仙散加入轻粉研末，每天进服三次，让人昏昏沉沉地痛苦醉酒，使毒涎从齿缝中排出，结果疠风未除，牙齿却先脱落了。大概除去疠风的药物，服用时间短且剂量少，疠风必定不能去除；服用时间长且剂量大，疠风虽然去除了，但药物带来的危害更大。只有易老的驱风丸、东坡的四神丹这两个方剂，可以久服。而且如果不是意志坚定、严格自我约束的人，不可以给他们治疗。
鹤膝风，就是风寒湿邪痹阻于膝关节的疾病。如果膝盖骨头日益肿大，而上下方的肌肉日益干枯萎缩，此时不要急于治疗膝盖，应先养血益气，使肌肉逐渐得到滋养后，再治疗膝盖。这与治疗左右半身偏枯（中风后遗症）的症状大同小异。既然已经发生偏枯，急需灌溉尚未枯萎的部位，然后才能使已枯萎的部位得以通气并恢复营养。如果不懂得从气引血、从血引气的治疗方法，仅仅使用麻黄、防风等发散风邪的猛烈药物，很少有不会导致全身枯竭而迅速死亡的。因此，治疗鹤膝风如果急切地攻伐其痹阻，必然会导致足部痿废不用。
古方治疗小儿鹤膝风，使用六味地黄丸加上鹿茸、牛膝，共八味药。不直接治风，这个用意非常高明。小儿患此病不一定完全是风寒湿邪痹阻所致，多是因为先天禀赋肾气衰弱单薄，阴寒凝聚在腰膝而不能解散，从外部症状可以推知内部状况。所以用六味地黄丸补肾中的真水，用鹿茸补肾中的真火，用牛膝引药力至骨节，以强壮包裹关节的筋腱，这是治本而非治标的良法，列举此例作为代表。
Zhu Danxi stated: The "Great Wind" disease is contracted from the lethal winds of heaven and earth. The ancients called it Li Feng (Leprosy/Severe Wind Disease) because its nature is cruel, fierce, violent, and terrifying. Once a person contracts this disease, one must distinguish whether the pathology is located in the upper or lower body. For pathology in the upper part, Zui Xian San (Intoxicating Immortal Powder) is used to expel foul phlegm and stagnant blood through the gum spaces; for pathology in the lower part, Tong Tian Zai Zao San (Sky-Penetrating Rebirth Powder) is used to expel foul matter and old parasites through the anus. Although the pathways of expulsion differ between upper and lower, they all fundamentally relate to the Yangming Channel (Yangming Meridian). Those treating this disease must understand this principle and observe the nodules and sores. If symptoms appear first on the upper body or are more prevalent there, the pathology is in the upper part; if they appear first on the lower body or are more prevalent there, the pathology is in the lower part; if both appear simultaneously, the pathology involves both upper and lower parts. The Yangming Stomach Channel and Large Intestine accept everything without discrimination. When wind pathogen invades the human body, if Qi is primarily affected, the pathology tends to be upper; if Blood is primarily affected, the pathology tends to be lower; if both Qi and Blood are affected, the condition is severe.
The ancients spoke of three causes and five deaths regarding Great Wind Disease. The three causes are: first, Wind Toxin; second, Dampness Toxin; third, Contagion. The five deaths refer to five critical stages: first, Skin Death, characterized by numbness and insensitivity; second, Pulse Death, characterized by blood ulceration turning into pus; third, Flesh Death, characterized by lack of pain upon cutting the flesh; fourth, Tendon Death, characterized by flaccidity and weakness of the hands and feet; fifth, Bone Death, characterized by collapse of the nasal bridge, along with falling eyebrows, dim vision, everted lips, hoarseness, and dysphagia, which are extremely fearsome. This occurs because evil and righteous pathogens attack each other, causing Qi and Blood to boil, leading to an accumulation of damp-phlegm and dead blood within the collaterals, thereby generating parasites and sores, resulting in pain, itching, and numbness.
Whether treated via the upper route or the lower route, these are curable diseases. People often neglect them because the progression appears slow. The general principles of treatment involve unblocking the internal Zang-Fu organs and venting the external channels and collaterals, applying therapy according to established methods. Furthermore, one must abstain from alcohol and sexual activity from start to finish, avoid foods that trigger wind and move Qi, as well as meat, fish, salt, soy sauce, roasted/fried items, and raw/cold foods. One must reduce desires and cravings to ensure safety and avoid danger.
Yu Jiayan stated: In treating Li Feng, the primary method is to clear and nourish Ying and Wei (Defensive and Nutritive Qi). Sweating should be induced frequently, and bloodletting should be performed frequently; both are expedient methods for clearing Ying and Wei. Parasites arise due to Lung Heat, where the Lung's descending and purifying function fails to operate normally, allowing the pathogen to spread gradually from the skin and hair pores to the interstices, intestines, and stomach, infesting everywhere. By clearing the Metal element (Lung), the parasites will extinguish themselves without needing to be driven out. Observe how when the Metal Wind blows, the drought demon disappears; the logic is clear. However, clearing the Lung must begin with clearing the Qi of Ying and Wei, because if Ying and Wei Qi become corrupt and unclear, they transmit to the Lung, damaging its purifying function first. Bitter medicines can drain the Lung and kill parasites, but they also damage the Stomach and cannot be taken for long periods. The Stomach is the source from which Ying and Wei originate; long-term use of bitter-cold herbs leads to corruption and stagnation of Stomach Qi, with consequences too numerous to state. Therefore, formulas like Kushen Wan (Sophora Root Pill) are unsuitable for prolonged use in individuals with inherently weak Ying and Wei and insufficient dietary intake. Da Feng Zi You (Oil of Semiaquilegia Fructus) is most effective at killing parasites and driving out wind, but it is excessively acrid and hot; often, the wind is not eliminated before the body itself is damaged. Liu Huang Jiu (Sulfur Wine) inevitably causes brain rupture upon ingestion. Additionally, Zui Xian San mixed with Qing Fen (Calomel/Precipitated Mercury Chloride) and taken as powder three times daily induces a state of heavy intoxication, expelling toxic saliva through the gums, resulting in tooth loss before the leprosy is cured. Generally, drugs for removing leprosy, if taken for a short time and in small doses, will not cure the disease; if taken for a long time and in large doses, although the disease may be removed, the harm caused by the drugs is even greater. Only Qu Feng Wan (Wind-Driving Pill) by Yi Lao and Si Shen Dan (Four Divine Pills) by Su Dongpo can be taken for extended periods. Moreover, these should only be prescribed to patients who are resolute and strictly disciplined in their lifestyle.
He Xi Feng (Crane Knee Wind) refers to Bi Syndrome (Obstruction Syndrome) caused by Wind-Cold-Dampness obstructing the knee joint. If the knee bones enlarge daily while the muscles above and below waste away and become thin, one should not immediately treat the knee. Instead, one must first nourish Blood and tonify Qi, allowing the muscles to gradually receive nourishment, before treating the knee. This is largely similar to treating hemiplegia (paralysis of one side of the body). Since hemiplegia has occurred, it is urgent to irrigate the non-paralyzed areas first, so that the paralyzed areas can regain Qi circulation and receive nourishment. If one does not understand the methods of guiding Blood via Qi and guiding Qi via Blood, and merely uses harsh dispersing drugs like Mahuang (Ephedra Herb) and Fangfeng (Saposhnikovia Root) to scatter wind, it is rare that the patient will not suffer total wasting and rapid death. Therefore, if treating He Xi Feng by urgently attacking the obstruction, it will inevitably lead to flaccid paralysis of the legs.
Ancient prescriptions for pediatric He Xi Feng used Liu Wei Di Huang Wan (Six-Ingredient Rehmannia Pill) supplemented with Lurong (Cervum Cornu Degelatinatum/Cornu Cervi Degelatinatum) and Niuxi (Achyranthis Bidentatae Radix), totaling eight ingredients. Not directly treating the wind reflects profound wisdom. Pediatric cases are not necessarily caused solely by Wind-Cold-Dampness obstruction; they often result from congenital deficiency of Kidney Qi, where Yin-Cold condenses in the waist and knees and fails to resolve. External signs reveal internal conditions. Thus, Liu Wei Di Huang Wan is used to tonify the Water (Yin) in the Kidney, Lurong to tonify the Fire (Yang) in the Kidney, and Niuxi to guide the medicinal action to the bone joints, strengthening the tendons surrounding them. This is an excellent method of treating the root rather than the branch, cited here as an example.