经曰∶风气与太阳俱入，行诸脉俞，散于分肉之间，与卫气相干，其道不利，故使
肌肉 而有疡。卫气
有所凝而不行，故其肉不仁也。厉者，有荣卫热 ，其气不清，故使鼻柱坏而色败，皮
肤疡溃。风寒客于脉而不去，名曰厉风。
厉风证则今之所谓大风，又谓之癞风，实受天地间杀物之风。古人谓之厉者，以其酷
烈暴悍可畏矣。
《三因》经所载，即风论所谓恶疾是也。虽名曰风，未必皆因风。大率多嗜欲劳动，
气血郁热，或发汗泄，不避风邪冷湿，使淫气与卫气相干，致肌肉皮肤疡溃，鼻梁崩塌，《千
金》所谓自作不仁，极猥之业，虽有悔言，而无悔心，良得其情。然亦有传染者。原其所
因，有不涉内外，亦有传染而成者。治之须推其所因，凡因风寒湿热兼劳役饮食，与夫传染
迥燃不同。若例作厉风治之则误矣。
传染之因，亦惟内热积毒者受之，所谓燥以逢火则先焚矣，亦不可不谓之风也。
厉风有五种。黄风生黄虫，青风生青虫，赤风生赤虫，白风生白虫，黑风生黑虫，惟
黑虫不可治。其虫在于病躯，去来无数，甚入骨髓。食人肝则眉脱，食人肺则鼻柱崩，食人
脾则语音变散，食人肾则耳鸣如雷，若食其心，则诸痛疮疡，心实司之，心受触则死矣。
然此病非止肺脏有之，以其病发于鼻，俗呼为肺风也。鼻肿准赤，胀大而成疮，乃
血随气化也。气既不施，则血为之聚。血既聚，则肉坏烂而生虫也。虫者，厥阴主之。厥
阴为风木，主生五虫。盖三焦相火热甚，而制金，金衰则木邪胜，侮金宜宣泄火邪利气
之剂，虫自不生也。故此病为血热明矣。初作当疏泄，煎《局方》升麻汤，下钱氏泻青
丸。余病各随经治。
《黄帝内经》说：风邪与太阳经同时侵入，运行于各经脉的腧穴，散布在分肉之间，与卫气相互干扰，导致经络通道不畅，因此使肌肉发生疮疡。卫气有所凝滞而不能正常运行，所以肌肉出现麻木不仁的现象。厉风（一种严重的皮肤病，相当于现代的麻风病），是由于营气和卫气热盛，体内气息不清净，从而导致鼻梁塌陷、面色败坏，皮肤溃疡溃烂。风寒之邪客居在脉中而不离去，就称为厉风。
厉风证就是现在所谓的大风，又叫做癞风，实际上是感受了天地间具有杀伤力的风邪。古人称之为“厉”，是因为这种邪气酷烈暴悍，令人畏惧。
《三因极一病证方论》中所记载的，就是《素问·风论》中所说的恶疾。虽然名为“风”，但未必都是由外感风邪引起。大体上多因嗜欲过度、劳力伤身，导致气血郁结化热；或者发汗后腠理开泄，不注意避开风邪、冷湿之气，使得淫邪之气与卫气相互干扰，致使肌肉皮肤溃疡溃烂，鼻梁崩塌。正如《千金方》所说，这是自作自受的不仁之举，行为极其卑劣猥琐，即使有后悔的话，却没有后悔的心，这确实符合实际情况。然而也有通过传染而得病的。推究其病因，有的不涉及内外因素，有的是通过传染形成的。治疗时必须推究其病因，凡是因风寒湿热兼夹劳役饮食，以及通过传染引起的，情况截然不同。如果一概按照厉风来治疗，那就错了。
传染的原因，也只有内热积毒的人才会感染，所谓干燥遇到火就会先被焚烧一样，这也不可不说是风邪致病。
厉风分为五种。黄风产生黄虫，青风产生青虫，赤风产生赤虫，白风产生白虫，黑风产生黑虫，只有黑虫引起的病症无法治愈。这些虫子存在于患病者的身体里，来来去去无数，甚至深入骨髓。如果虫子吃人的肝脏，眉毛就会脱落；吃人的肺脏，鼻梁就会崩塌；吃人的脾脏，语音就会变得散乱；吃人的肾脏，耳鸣声如雷鸣；如果吃人的心脏，各种疼痛和疮疡都会发作，因为心主宰着这些症状，心脏受到侵害就会死亡。
然而此病并不只限于肺脏，因为病症发于鼻部，俗称为肺风。鼻子肿胀、山根发红，胀大而成疮，这是因为血随着气的变化而变化。气不能正常施布，血液就会聚集。血液一旦聚集，肌肉就会腐烂而生出虫子。虫子由厥阴肝经所主。厥阴属风木，主管生成五虫。大概是因为三焦相火过于旺盛，克制了肺金，导致金气衰弱，木邪乘胜，侮害肺金。适宜使用宣泄火邪、利气的方剂，虫子自然就不会产生。因此可以明确此病属于血热。初起时应当疏泄，煎服《太平惠民和剂局方》中的升麻汤，并服用钱乙的泻青丸。其余病症各自根据所属经络进行治疗。
The *Huangdi Neijing* (Yellow Emperor's Inner Canon) states: Wind pathogen (*Feng Xie*) enters together with the Taiyang channel (*Taiyang Jing*), travels through the Shu points of various meridians, and scatters between the muscle layers (*Fenrou*). It interferes with the Wei Qi (*Defensive Qi*), causing obstruction in its pathways, thus leading to sores in the muscles. When Wei Qi stagnates and fails to circulate, the flesh becomes insensible (*Bu Ren*, numbness). Li Feng (*Li Feng*, a severe dermatological condition equivalent to modern leprosy) occurs when Ying Qi (*Nutritive Qi*) and Wei Qi are excessively hot, and the internal qi is impure, resulting in the collapse of the nasal bridge, deterioration of complexion, and ulceration of the skin. When cold and wind pathogens lodge in the vessels and do not depart, it is named Li Feng.
The syndrome of Li Feng is what is currently referred to as "Da Feng" (Great Wind) or "Lai Feng" (Leprosy), actually caused by the reception of lethal winds from heaven and earth. The ancients called it "Li" because the pathogen is fierce, violent, and terrifying.
What is recorded in the *San Yin Ji Bing Fang Lun* (Treatise on the Three Causes of Disease) corresponds to the "evil disease" mentioned in the *Suwen: Feng Lun* chapter. Although named "Wind," it is not necessarily caused solely by external wind invasion. Generally, it arises mostly from excessive desires and physical labor, leading to qi and blood stagnation transforming into heat; or after sweating, when pores are open, one fails to avoid wind, cold, and damp pathogens, allowing pernicious qi to interfere with Wei Qi, causing muscle and skin ulceration and nasal collapse. As stated in the *Qianjin Fang* (Essential Prescriptions Worth a Thousand Gold), this is self-inflicted impropriety, engaging in extremely vile acts; although there may be words of regret, there is no heart of repentance, which indeed reflects the reality. However, there are also cases transmitted via contagion. Investigating the etiology, some involve neither internal nor external factors, while others result from transmission. Treatment must deduce the specific cause. Cases involving wind, cold, damp-heat combined with labor, diet, and those caused by contagion are distinctly different. If all are treated uniformly as Li Feng, it would be an error.
The cause of contagion affects only those with accumulated internal heat and toxins. Just as dryness meets fire and burns first, this too cannot be denied as wind-pathogen pathology.
Li Feng has five types. Huang Feng (Yellow Wind) generates yellow worms; Qing Feng (Green Wind) generates green worms; Chi Feng (Red Wind) generates red worms; Bai Feng (White Wind) generates white worms; Hei Feng (Black Wind) generates black worms. Only the black worm-induced disease is incurable. These worms reside in the patient's body, moving endlessly, even penetrating to the bone marrow. If they consume the liver, eyebrows fall out; if they consume the lungs, the nasal bridge collapses; if they consume the spleen, speech becomes scattered; if they consume the kidneys, tinnitus sounds like thunder; if they consume the heart, various pains and sores erupt. Since the Heart governs these manifestations, damage to the Heart leads to death.
However, this disease is not limited to the Lung organ. Because the symptoms manifest in the nose, it is colloquially called Lung Wind (*Fei Feng*). Nasal swelling and redness at the root, enlarging into sores, occur because blood follows the transformation of qi. When qi fails to distribute properly, blood accumulates. Once blood accumulates, flesh rots and worms are generated. Worms are governed by the Jueyin Liver Channel (*Jueyin Gan Jing*). Jueyin belongs to Wind-Wood and governs the generation of the five worms. This is likely due to excessive Fire of the Triple Burner (*Sanjiao*) suppressing Metal (*Jin*); when Metal is weak, Wood evil prevails and insults Metal. It is appropriate to use formulas that vent fire pathogen and promote qi circulation, so that worms will naturally not arise. Thus, this disease is clearly identified as Blood Heat (*Xue Re*). In the initial stage, one should employ dispersing and purging methods, decocting Shengma Tang (*Cimicifugae Decoction*) from the *Taiping Huimin Heji Jufang* (Formulas of the Bureau for the Care of the People), and administering Qian Shi's Xieqing Wan (*Draining Green Pill*). Other diseases should be treated according to their respective meridians.