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Wind is named according to its etiology. Bi syndrome (Bi Syndrome, obstruction syndrome) and Wei syndrome (Wei Syndrome, flaccidity syndrome) are named according to their clinical manifestations. Wind is the leader of the Six Excesses (Six Pathogenic Factors: wind, cold, summerheat, dampness, dryness, fire), while Bi syndrome results from the mixture of three pathogenic factors; hence, some refer to them together as "Wind-Bi," due to the similarity in their clinical presentations. Both Bi syndrome and Wei syndrome involve the five tissues—tendons, bones, skin, flesh, and vessels—and both present with symptoms such as impaired circulation of Qi and Blood, insensitivity of muscles, and inability to use the limbs. Therefore, some refer to them together as "Bi-Wei," again due to the similarity in their clinical presentations. However, Wind syndrome and Wei syndrome cannot be generalized or treated uniformly. This is why Zhu Danxi criticized the errors in *Ju Fang* (Formulas of the Bureau for the Care of the People's Health), correcting a millennium-old misconception. Xu Yanchun’s specific division of Wind and Wei syndromes into two separate categories has been of great benefit to later scholars. Nevertheless, not only must Wind and Bi syndromes not be confused, but Wind syndrome and Wei syndrome must also not be confused. For instance, in Wind syndrome, the inability to move the limbs is differentiated: left-sided hemiplegia is often due to Blood deficiency generating Phlegm, while right-sided hemiplegia is often due to Qi deficiency with Phlegm. In Bi syndrome, the inability to move the limbs arises from the transformation of Dampness, characterized by heaviness and fixed location. If injured by Wind, the Yang meridians are affected; if exposed to Wind-Cold-Dampness, the Yin meridians are affected. Thus, Wind and Bi syndromes cannot be conflated in name or treatment. Bi syndrome involves the confluence of three pathogenic factors and represents an external excess pathogen; the treatment principle should primarily focus on dispersing Wind, scattering Cold, and promoting diuresis to resolve Dampness, thereby ensuring the smooth flow of Qi and Blood for recovery. Wei syndrome, conversely, stems from chronic deficiency leading to internal heat, subsequently affecting the Zang organs; it is an internal deficiency condition. The treatment principle should primarily select the Yangming channel, or alternatively employ the method of purging the South (Heart/Fire) and tonifying the North (Kidney/Water), thereby raising Qi and enriching Blood for recovery. Consequently, Bi and Wei syndromes cannot be conflated in name or treatment. Given that these three cannot be mixed, how should they be distinguished? It lies in the correlation between pulse diagnosis and clinical signs. For example, after sudden collapse due to Zhong Feng (Wind Stroke), resulting in hemiplegia or limb paralysis, accompanied by Phlegm obstructing the speech and facial deviation, although there may be distinctions between Qi and Blood deficiency, the persistence of the pathogen renders the condition Excess. This is Wind syndrome. The pulse will necessarily be Floating and Slippery. For instance, exposure to wind during sweating, sitting or lying in damp places, or wading through cold water, leading to joint pain, cutaneous insensitivity, limb heaviness, and flaccidity or spasmodic tension in the limbs, although related to external pathogens like Wind, the characteristics of pain and heaviness distinguish it as Bi syndrome. The pulse will necessarily be Tight and Choppy. For example, following excessive emotional stress, overwork, or unrestrained alcohol and sexual activity, without exposure to Cold-Dampness or sudden collapse, presenting with progressive flaccidity and fatigue, eventually leading to depletion of Essence and Marrow, weakness of tendons and bones, and inability to maintain posture, this is Wei syndrome. The pulse will necessarily be Deficient and Rapid. Understanding this makes the distinction among these three syndromes as clear as daylight, eliminating any error in mixed treatment.