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Wind can be categorized as "True Wind" (Zhen Feng) or "Resembling Wind" (Lei Feng), and the distinction between them must not be overlooked. When wind-cold pathogens invade from the exterior, they are termed Wind Pathogens (Feng Xie). For instance, the disease patterns related to wind in the *Jiu Gong Ba Feng* Chapter, the concepts of Deficient Wind (Xu Feng) and Excess Wind (Shi Feng) in the *Sui Lu* Chapter, the four-season wind syndromes in the *Jin Gui Zhen Yan Lun*, organ-specific wind strokes in the *Feng Lun*, wind-bi and wind-dan syndromes in the *Yu Ji Zhen Zang Lun*, wind-induced bi-syndromes in the *Zeifeng* Chapter, malaria arising from wind in the *Nue Lun* and *Sui Lu* Chapters, wind-jue and lao-feng in the *Ping Re Bing Lun*, great wind in the *Gu Kong Lun*, wind-spasm in the *Re Bing* Chapter, wine-wind in the *Bing Neng Lun*, and cold-induced coughs in the *Ke Lun*—all these refer to diseases caused by exogenous wind pathogens.

However, some conditions manifest as wind without being caused by external invasion. As stated in the *Suwen: Zhi Zhen Yao Da Lun* (Basic Questions: Essential Meaning of Disease Mechanisms): "All sudden spasms and rigidity belong to wind; all wind-related tremors and vertigo belong to the Liver." These are classified under wind but are not actually exogenous wind pathogens.

Why is this distinction made? That which is invaded by an external pathogen is called "Zhong" (Stroke/Invasion); that which lacks such invasion but presents with wind-like symptoms is called "Shu" (Belongs to/Associated with). If there is no external invasion, why use the term "Shu"? This refers to the dominance of the Five Movements (Wu Yun) over specific organs. For example, "All dampness-related swelling and fullness belong to the Spleen; all cold-related contraction and pulling belong to the Kidney." These descriptions emphasize the associative relationship. Similarly, wind is associated with the Liver. The Liver is the zang-organ of the East, it stores blood, and it governs wind. When the Liver is diseased, blood pathology occurs, leading to a loss of nourishment for the sinews. Sinew pathology results in various manifestations such as tremors, vertigo, and rigidity, giving rise to numerous wind-associated syndromes. Thus, it is said that "they all belong to the Liver," which also means "they all belong to wind."

Pathogens invading from the outside constitute True Wind (Zhen Feng); internal wind manifestations constitute Wood Evil (Mu Xie, referring to Liver Wood pathogenicity). True Wind represents an exterior syndrome due to exogenous factors; Resembling Wind represents an interior syndrome due to endogenous injury, falling under categories such as jue-ni (reversal cold/heat) and nei-duo (internal depletion).

The terms "Zhong" and "Shu" are clearly distinguished in the *Neijing* (*Huangdi Neijing*), each having its specific meaning. Just as a year may be associated with the Rat or the Ox, it does not mean the year itself is a rat or an ox. However, later generations failed to distinguish them clearly, leading to confusion in formulas and theories, and resulting in misdiagnosis regarding exterior and interior syndromes. No error in medical history has been more detrimental than this. Although the *Neijing* did not originally distinguish between True Stroke and Resembling Stroke, Wang Andao was the first to propose this theory, which I greatly approve of. However, his analysis was not exhaustive; therefore, I restate it to elaborate on the argument. To truly understand this principle, one should silently contemplate the distinctions among Four Concepts: Wind Stroke (Zhong Feng), Resembling Wind (Shu Feng), Exterior Syndromes (Biao Zheng), and Interior Syndromes (Li Zheng), and the truth will become apparent.