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Exogenous wind pathogens and endogenous wind, as well as pathological factors such as Blood Deficiency (Xue Xu), Qi Deficiency (Qi Xu), Phlegm (Tan), Dampness (Shi), and Fire (Huo).

Pian Feng (Biased Wind), Nao Feng (Brain Wind), Mu Feng (Eye Wind), Lou Feng (Leaking Wind), Nei Feng (Internal Wind), Shou Feng (Head Wind), Chang Feng (Intestinal Wind), Xie Feng (Sweating Wind).

Zhang Hezi stated: Various wind syndromes causing tremors and vertigo are manifestations of the Jueyin Liver Channel (Jueyin Gan Jing). Treatment should employ the three methods of sweating, vomiting, and purging, which embodies the principle of "Shu Yu Da Zhi" (dispersing and unblocking Liver Wood stagnation).

Lu Dijing said: When Shen (Spirit) is damaged by excessive thinking, Yi (Intent) becomes internally depleted; when Zhi (Will) is damaged by sorrow and worry, limbs become paralyzed; when Hun (Ethereal Soul) is damaged by grief, sinews contract; when Po (Corporeal Soul) is damaged by excessive joy, skin becomes withered; when Zhi (Willpower) is damaged by fear, the waist and spine become difficult to bend or extend. All these are signs of Zhong Feng (Wind Stroke).

Zhu Danxi said: Zhong Feng (Wind Stroke) resulting in hemiplegia is largely due to Tan (Phlegm). Lesions on the left side generally belong to Blood Deficiency (Xue Xu), while lesions on the right side generally belong to Qi Deficiency (Qi Xu).

The Classics state: Wind pathogens invading the human body generally present in four major forms: First is Pian Ku (Hemiplegia/Atrophy), characterized by uneven deficiency of Qi and Blood, hemiplegia, emaciation of muscles, and pain in the bone joints. Second is Feng Fei (Wind Paraplegia), characterized by clear consciousness, absence of body pain, but inability to move the four limbs or one arm. Third is Feng Yi (Wind Stupor), characterized by sudden collapse and confusion, stiff tongue with inability to speak, throat obstruction, and gurgling sounds. Fourth is Feng Bi (Wind Bi Syndrome), where Wind, Cold, and Dampness combine to form Bi syndrome. The body feels numb and heavy, lacking sensation of pain or itch. Excess Wind causes wandering pain; excess Cold causes severe pain; excess Dampness causes heaviness and sticking. In the sinews, they flex but cannot extend; in the vessels, blood coagulates and fails to flow; in the flesh, there is insensibility; in the bones, there is heaviness and swelling.

Li Dongyuan said: Zhong Fu (Middle Fu Organs) syndromes often affect the four limbs, presenting with exterior symptoms, floating pulse, aversion to wind and cold, limb stiffness and numbness, or limb paralysis and inability to lift. Treatment should employ diaphoresis (sweating method). Zhong Zang (Middle Zang Organs) syndromes often involve dysfunction of the nine orifices, flaccid lips, loss of voice, constipation, heat excess with salivary flooding. Treatment should employ purgation. If the pathogen strikes the Mai Jing (Vessels and Collaterals), it manifests as facial deviation and slurred speech; this is the pathogen striking the meridians. Fundamentally, Wind is Heat; when Heat is excessive, Wind moves. One should use stillness to overcome dryness and nourish Yin Blood; once Yin is abundant, Wind-Heat will naturally subside. However, there are cases leading to loss of voice, mental confusion, and excessive Phlegm-Saliva obstructing the throat; treatment should employ emesis (vomiting method).

Dai Yuanli said: Nowadays, some people suffer from acute illness, suddenly collapsing into unconsciousness with salivary flooding and phlegmatic rales, resembling Zhong Feng (Wind Stroke), often resulting in death. This is not caused by exogenous Wind pathogens, but by negligence in self-care. People indulge in rich and sweet foods, causing internal Heat stagnation; they engage in excessive sexual activity, depleting Kidney Water. Anger stirs Liver Fire, which rises uncontrollably because Kidney Water is insufficient to control it. The Fire carries Phlegm, which adheres to the throat and diaphragm, leading to untreatable conditions and rapid onset of disease.