角弓反张，是体虚受风，风入诸阳之经也。人阴阳经络，周环于身，风邪乘虚入诸阳之
经，则腰背反折，挛急如角弓之状。
偏风口 ，是体虚受风，风入于夹口之筋也。足阳明之筋，上夹于口，其筋偏虚，
而风因乘之，使其经筋偏急不调，故令口 僻也。
贼风偏枯，是体偏受风，风客于半身也。人有劳伤血气，半身偏虚者，风乘虚入客，为
偏风也。其风邪入深，真气去，邪气独留，则为偏枯。此由血气衰损，为风所客，令血气不
相周荣于肌肉，故令偏枯也。
风眩，是体虚受风，风入于脑也。诸腑脏之精，皆上注于目；其血气与脉，并上属于脑
。循脉引于目系，目系急，故令眩也。其眩不止，风邪甚者，变癫倒为癫疾。
癫者，卒发仆地，吐涎沫，口 ，目急，手足缭戾，无所觉知，良久乃苏。狂者，
或言语倒错，或自高贤，或骂詈，不避亲疏，亦有自定之时。皆由血气虚，受风邪所为。人
禀阴阳之气而生，风邪入并于阴则为癫，入并于阳则为狂。阴之与阳，更有虚有实，随其虚
时，为邪所并则发，故发癫又发狂。
又人在胎之时，其母卒大惊动，精气并居，亦令子发癫，此则小儿而发癫者，是非关长
因血气虚损，受风邪所为。
又有五癫∶一曰阳癫，二曰阴癫，三曰风癫，四曰湿癫，五曰劳癫，此盖随其感处之由
又有牛、马、猪、鸡、狗之癫，皆以其癫发之时，声形状似于牛、马等，故以为名也。
俗云∶病癫人忌食六畜之肉，食者癫发之状，皆悉象之。
角弓反张，是由于身体虚弱感受风邪，风邪侵入诸阳经所致。人体的阴阳经络环绕全身，风邪乘虚侵入诸阳经，就会导致腰背向后反折，肌肉痉挛拘急，形状像拉满的弓一样。
口眼歪斜（偏风口），是由于身体虚弱感受风邪，风邪侵入夹持口部的筋脉所致。足阳明胃经的筋脉上行夹于口部，如果该处筋脉偏于虚弱，风邪便趁机侵入，导致经筋一侧拘急不调，从而引起口眼歪斜。
贼风偏枯，是指身体半身感受风邪，风邪客居于半身。人如果有劳力损伤导致血气亏损，出现半身偏虚的情况，风邪便乘虚侵入客居，形成偏风。如果风邪深入，真气耗散，只有邪气独留，就会形成偏枯。这是由于血气衰败受损，被风邪客居，导致血气不能周流荣养肌肉，所以造成半身不遂（偏枯）。
风眩，是由于身体虚弱感受风邪，风邪侵入脑部所致。各脏腑的精气都上注于目；血气与经脉一起向上归属于脑。循着经脉牵引至目系，如果目系拘急，就会导致眩晕。如果眩晕不止，且风邪严重，会转变为癫仆，成为癫疾。
癫证，是突然发作倒地，吐涎沫，口眼歪斜，眼睛拘急，手足扭曲，神志不清，很久才能苏醒。狂证，有的言语错乱颠倒，有的自视高贵贤能，有的骂詈他人，不分亲疏，也有暂时安静的时候。这都是因为血气虚弱，受到风邪侵袭所致。人禀受阴阳之气而生，风邪侵入并合于阴分则发为癫证，侵入并合于阳分则发为狂证。阴和阳，有时虚有时实，随着其虚损之时，被邪气所并合就会发病，所以既发癫又发狂。
另外，人在胎儿时期，母亲突然受到大惊吓，精气并聚，也会导致子女发生癫证，这是小儿发癫的原因，这与成年后因血气虚损、受风邪所致不同。
又有五种癫证：一是阳癫，二是阴癫，三是风癫，四是湿癫，五是劳癫，这大概是随着感邪部位的不同而命名。
还有牛癫、马癫、猪癫、鸡癫、狗癫，都是因为发作时的声音和形态像牛、马等动物，所以以此命名。
民间说：患癫病的人忌讳食用六畜的肉，吃了之后，癫病发作时的状态，都会像那种动物的样子。
Jiaogonganzhang (Opisthotonos) is caused by body deficiency with wind pathogen invasion, where the wind enters the Yang meridians. The Yin and Yang meridians of the human body encircle the entire body. When the wind pathogen takes advantage of the deficiency to enter the Yang meridians, it causes the waist and back to arch backward in a spasm, resembling the shape of a drawn bow.
Piankoufeng (Facial Paralysis/Deviation of Mouth and Eye) is caused by body deficiency with wind pathogen invasion, where the wind enters the tendons flanking the mouth. The tendons of the Foot-Yangming Stomach Meridian ascend and flank the mouth; if these tendons are deficient on one side, the wind pathogen takes advantage of this, causing the meridian-tendons to become spasmodic and unbalanced on that side, thus leading to deviation of the mouth and eye.
Zefeng Pianku (Wind-induced Hemiplegia) refers to wind pathogen invading one half of the body. If a person has suffered from labor injury leading to blood and Qi deficiency, resulting in hemibody deficiency, the wind pathogen invades and resides there due to the deficiency, forming Pianfeng (Hemiplegic Wind). If the wind pathogen penetrates deeply, depleting the True Qi and leaving only the evil pathogen, it results in Pianku (Hemiplegia). This occurs because blood and Qi are depleted and damaged, allowing the wind pathogen to reside, preventing blood and Qi from circulating and nourishing the muscles, thus causing hemiplegia.
Fengxuan (Wind-induced Vertigo) is caused by body deficiency with wind pathogen invasion, where the wind enters the brain. The essence of all Zang-Fu organs ascends to the eyes; blood and Qi, along with the vessels, ascend and connect to the brain. Following the vessels to the optic nerve system, if the optic nerve system becomes tense, it leads to vertigo. If the vertigo persists and the wind pathogen is severe, it may transform into sudden collapse, becoming Dianji (Epilepsy/Mental Disorder).
Dian (Manic-Depressive Psychosis/Epilepsy) involves sudden onset with falling to the ground, salivation, deviation of the mouth and eyes, tension of the eyes, twisting of the hands and feet, loss of consciousness, and recovery after a long period. Kuang (Hyperactive Mania) involves speech disorder or inversion, self-aggrandizement as noble and virtuous, cursing others regardless of kinship or distance, and periods of relative calm. All these are caused by blood and Qi deficiency and wind pathogen invasion. Humans are born endowing Yin and Yang Qi; when the wind pathogen invades and combines with Yin, it manifests as Dian; when it invades and combines with Yang, it manifests as Kuang. Yin and Yang have varying states of deficiency and excess; when they are deficient, the pathogen combines with them, triggering an attack, hence both Dian and Kuang can occur.
Furthermore, during fetal development, if the mother suffers a sudden great fright, the essence and Qi may congregate abnormally, also causing the child to develop Dian. This type of pediatric Dian is not related to adult blood and Qi deficiency and wind pathogen invasion.
There are five types of Dian: 1. Yang Dian, 2. Yin Dian, 3. Feng Dian (Wind Dian), 4. Shi Dian (Damp Dian), 5. Lao Dian (Fatigue Dian). These names likely derive from the specific location or nature of the pathogenic factor.
There are also Niu Dian (Oviform Dian), Ma Dian (Equine Dian), Zhu Dian (Porcine Dian), Ji Dian (Galliform Dian), and Gou Dian (Canine Dian). These are named so because the sounds and postures exhibited during attacks resemble those of oxen, horses, pigs, chickens, and dogs, respectively.
Popular belief states that patients suffering from Dian should avoid eating meat of the six domestic animals; consuming such meat will cause the Dian attack to manifest characteristics resembling that animal.