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The clinical manifestations include sudden collapse, unconsciousness, accumulation of phlegm and saliva obstructing the airway, and sounds in the throat. Alternatively, there may be deviation of the mouth and eye (facial paralysis), paralysis of the four limbs, hemiplegia (paralysis of one side of the body), lockjaw with a stiff tongue, aphasia (loss of ability to speak). (Sudden collapse indicates involvement of the Zang organs, which is a severe syndrome. Absence of collapse indicates involvement of the meridians and vessels, which is a mild syndrome. See below for details.) Wind is categorized into External Wind and Internal Wind. Internal Wind refers to the disorderly movement of Qi within the human body. (The *Classic of Internal Medicine* states: The Qi of the human body can be named after the violent winds of heaven and earth. Furthermore, excess Qi transforms into Fire; the manifestation of Fire-Qi is rapid like wind. Additionally, the Liver corresponds to Wind in the Five Elements.) External Wind arises from external pathogenic invasion, while Internal Wind arises from internal injury. This condition may be caused purely by internal injury, or by internal injury combined with External Wind; it never occurs solely due to External Wind. If it were merely a simple case of contracting External Wind, it would present only as mild symptoms such as headache, fever, and spontaneous sweating, as described in Zhang Zhongjing’s *Treatise on Cold Damage Diseases*. How could it result in sudden coma and collapse, nearing death, as the severe syndromes listed above? (These aforementioned severe syndromes are all caused by the depletion and failure of internal injuries. Wind, unless it is Cold, even if extremely violent, does not cause people to faint or collapse. Only the cold winds of the northwest regions may cause people to freeze and collapse, but this belongs to Cold Strike (Zhong Han) and is not termed Wind Strike.) According to Wang Andao, symptoms such as sudden rigidity and collapse were previously considered to be caused by external Wind invasion. However, when Liu Wansu, Li Dongyuan, and Zhu Danxi appeared, their theories differed from those of the ancients. Liu Wansu emphasized Fire as the primary pathogenesis, Li Dongyuan emphasized Qi, and Zhu Danxi emphasized Dampness (see below), regarding Wind instead as a sign of deficiency. Presumably, these three scholars conflated diseases similar to Wind Strike in their theoretical discussions, causing confusion among later generations. Later generations followed their teachings, considering what the ancients said to be "True Wind Strike" and what these three discussed to be "Similar Wind Strike." Zhang Jingyue further stated that the theories of these three scholars have nothing to do with external Wind pathogens; thus, they should not be called Wind Strike, nor Similar Wind Strike, but directly termed "Non-Wind" (Fei Feng). (He Mengyao notes:) The theories of these three scholars refer specifically to Internal Wind, established in contrast to externally contracted Wind. Both Internal Wind and External Wind can be termed "Struck by Wind"; therefore, I continue to use the general term Wind Strike to ensure people understand the concept of Internal Wind, not to deliberately contradict Mr. Wang, Mr. Zhang, and other scholars.