三痹之因风寒湿，五痹筋骨脉肌皮，风胜行痹寒痹痛，湿胜着痹重难支。皮麻肌木
脉色变，筋挛骨重遇邪时，复感于邪入脏腑，周同脉痹不相移。
【注】三痹之因，风寒湿三气杂合而为病也。其风邪胜者，其痛流走，故曰行痹。寒
邪胜者，其痛甚苦，故曰痛痹。湿邪胜者，其痛重着，故曰着痹。此为病之因而得名，曰
三痹也。又有曰五痹者，谓皮、脉。肌、筋。骨之痹也。以秋时遇此邪为皮痹，则皮虽麻
尚微觉痛痒也。以夏时遇此邪为脉痹，则脉中血不流行、而色变也。以长夏时遇此邪为
肌痹，则肌顽木不知痛痒也。以春时遇此邪为筋痹，则筋挛节痛屈而不伸也，以冬时遇
此邪为骨痹，则骨重酸疼不能举也，曰入脏腑者，谓内舍五脏之痹也。以皮痹不已，复
感于邪，内舍于肺，成肺痹也。脉痹不已，复感于邪，内舍于心，成心痹也。肌痹不已，复
感于邪，内舍于脾，成脾痹也，筋痹不已，复感于邪，内舍于肝，成肝痹也，骨痹不已，复
感于邪，内舍于肾，成肾痹也，此皆以病遇邪之时，及受病之处而得名，曰五痹也。所
谓邪者，重感于风寒湿之气也。周痹亦在血脉之中，随脉上下为病，故同脉痹，但患有
定处，不似脉痹左右相移也。近世曰痛风，曰流火。曰历节风。皆行痹之俗名也。
痹病产生的原因，是风、寒、湿三种邪气混杂侵袭人体所致。五痹分别指皮痹、脉痹、肌痹、筋痹和骨痹。风气偏胜的为行痹，寒气偏胜的为痛痹，湿气偏胜的为着痹（重着难移的痹证）。
皮肤麻木、肌肉僵硬、血脉颜色改变，筋脉拘挛、骨骼沉重，都是在感受邪气时出现的症状。如果再次感受邪气，病邪就会传入脏腑，周痹与脉痹在病变部位上相似，但疼痛位置固定，不像脉痹那样左右游走转移。
【注】三痹的原因，是风、寒、湿三气杂合在一起致病。其中风邪偏胜的，疼痛游走不定，所以称为行痹。寒邪偏胜的，疼痛剧烈痛苦，所以称为痛痹。湿邪偏胜的，疼痛重着不移，所以称为着痹。这是根据致病的病因来命名的，称为三痹。
又有称为五痹的，是指皮、脉、肌、筋、骨五种部位的痹证。如果在秋季感受这些邪气，就形成皮痹，此时皮肤虽然麻木，但仍轻微感觉痛痒。如果在夏季感受这些邪气，就形成脉痹，此时血脉中血液运行不畅，导致面色或脉色改变。如果在长夏（夏末秋初）感受这些邪气，就形成肌痹，此时肌肉顽硬麻木，不知痛痒。如果在春季感受这些邪气，就形成筋痹，此时筋脉拘挛，关节疼痛，屈伸不利。如果在冬季感受这些邪气，就形成骨痹，此时骨骼沉重酸痛，不能抬举。
所谓“入脏腑”，是指病邪内传并停留于五脏形成的痹证。如果皮痹久治不愈，再次感受邪气，病邪内传于肺，形成肺痹。脉痹久治不愈，再次感受邪气，病邪内传于心，形成心痹。肌痹久治不愈，再次感受邪气，病邪内传于脾，形成脾痹。筋痹久治不愈，再次感受邪气，病邪内传于肝，形成肝痹。骨痹久治不愈，再次感受邪气，病邪内传于肾，形成肾痹。这些都是根据发病时感受邪气的季节，以及受病的部位来命名的，称为五痹。
所谓的“邪”，是指再次感受风、寒、湿之气。周痹也是在血脉之中，随着经脉上下运行而发病，所以与脉痹相似，但周痹的疼痛有固定位置，不像脉痹那样左右相互转移。近代所说的痛风、流火、历节风，都是行痹的俗称。
The etiology of Bi syndrome (Bi Syndrome, obstruction syndrome) lies in the mixed invasion of Wind, Cold, and Dampness pathogens. The Five Bi syndromes refer to Pi Bi (Skin Bi), Mai Bi (Vessel Bi), Ji Bi (Muscle Bi), Jin Bi (Tendon Bi), and Gu Bi (Bone Bi). When Wind pathogen predominates, it is called Xing Bi (Wandering Bi); when Cold pathogen predominates, it is called Tong Bi (Painful Bi); when Dampness pathogen predominates, it is called Zhuo Bi (Fixed/Heavy Bi).
Symptoms include numbness of the skin, stiffness of the muscles, changes in the color of the vessels, contraction of tendons, and heaviness of the bones, which occur upon exposure to pathogens. If exposed to pathogens again, the disease may enter the Zang-Fu organs. Zhou Bi (Generalized Bi) shares similarities with Mai Bi regarding the location of pathology, but its pain is fixed in place, unlike Mai Bi which shifts from left to right.
[Note] The cause of the Three Bi syndromes is the complex interaction of Wind, Cold, and Dampness pathogens. When Wind pathogen predominates, the pain migrates; hence it is called Xing Bi (Wandering Bi). When Cold pathogen predominates, the pain is severe and bitter; hence it is called Tong Bi (Painful Bi). When Dampness pathogen predominates, the pain is heavy and fixed; hence it is called Zhuo Bi (Fixed Bi). These are named according to their etiological factors, collectively referred to as the Three Bi syndromes.
There is also the term "Five Bi," referring to Bi syndromes affecting the Skin, Vessels, Muscles, Tendons, and Bones. If these pathogens are encountered in Autumn, it forms Pi Bi (Skin Bi), where the skin is numb but still retains slight sensation of pain and itching. If encountered in Summer, it forms Mai Bi (Vessel Bi), where blood circulation within the vessels is impaired, leading to changes in complexion or vessel color. If encountered in Late Summer, it forms Ji Bi (Muscle Bi), where the muscles become hard and numb, losing sensation of pain and itching. If encountered in Spring, it forms Jin Bi (Tendon Bi), characterized by tendon contraction, joint pain, and inability to flex or extend. If encountered in Winter, it forms Gu Bi (Bone Bi), characterized by heavy, sore bones and inability to lift or move them.
"Entering the Zang-Fu organs" refers to the internal transmission of Bi pathogens to the Five Zang organs. If Pi Bi persists and is re-exposed to pathogens, it transmits internally to the Lung, forming Fei Bi (Lung Bi). If Mai Bi persists and is re-exposed to pathogens, it transmits internally to the Heart, forming Xin Bi (Heart Bi). If Ji Bi persists and is re-exposed to pathogens, it transmits internally to the Spleen, forming Pi Bi (Spleen Bi). If Jin Bi persists and is re-exposed to pathogens, it transmits internally to the Liver, forming Gan Bi (Liver Bi). If Gu Bi persists and is re-exposed to pathogens, it transmits internally to the Kidney, forming Shen Bi (Kidney Bi). These are named based on the season of pathogen exposure and the affected anatomical site, collectively known as the Five Bi syndromes.
The "pathogens" mentioned refer to the repeated exposure to Wind, Cold, and Dampness. Zhou Bi (Generalized Bi) also occurs within the blood vessels, moving up and down along the meridians; thus, it resembles Mai Bi (Vessel Bi). However, Zhou Bi has a fixed location of pain, whereas Mai Bi shifts from side to side. In modern times, conditions such as Gout (Tong Feng), Flowing Fire (Liu Huo), and Li Jie Feng (Inter-articular Wind) are considered common names for Xing Bi (Wandering Bi).