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This corresponds to the statement in the *Huangdi Neijing* (Yellow Emperor's Inner Canon) that the three pathogens of Wind, Cold, and Dampness mix together and invade the body, combining to form Bi Syndrome (Obstruction Syndrome). Although it is stated that Cold predominates in Painful Bi (Tongbi), all three pathogens can cause pain. However, when Cold is predominant, the pain is severe and feels like pulling or twitching; when Dampness is predominant, the pain is fixed and heavy, resembling swelling; when Wind is predominant, the pain migrates without a fixed location. All these occur because the stagnant pathogenic obstruction clashes with the circulating Ying (Nutrient) and Wei (Defensive) True Qi, resulting in Painful Bi. If the pathogens do not interfere with the pathways of circulation and entry/exit, there will be no pain, only Wei Syndrome (Flaccidity) and numbness. Depending on the location of the Bi syndrome: if Yang is excessive and Yin is deficient, it becomes Heat Bi; if Yin is excessive and Yang is deficient, it becomes Cold Bi; symptoms may include heavy bones, contracted sinews unable to extend, insensitivity of muscles, and coagulation/stagnation of blood vessels. If the pathogen is in the skin, there is cold sensation; if exposed to heat, the limbs become flaccid. Later generations extracted those cases characterized by pain into six categories, listing hundreds of prescriptions. The key to using herbs lies in understanding the principles (Dao), not in verbose explanations. If one understands the principles, even a single phrase or prescription can be applied by analogy; if the principles are not understood, how can one select and use them appropriately? Among these six categories, some attribute the condition to Wind-Cold-Dampness causing blood stagnation and poor circulation, leading to lack of nourishment for joints and sinews, with true and evil qi clashing to cause Li Jie Tong (Joint Pain); some attribute it to Wind causing pain in all joints; some describe Wind migrating with pain having no fixed location; some call it Bai Hu Feng (White Tiger Wind), located in bone joints or moving through the four limbs, quiet during the day but occurring at night with pain penetrating to the bone; some refer to Wind-induced lower back pain. Are these not all Bi syndromes caused by Wind, Cold, and Dampness resulting in pain? One might argue: The *Bi Lun* (Discourse on Bi Syndrome) only mentions Cold as causing Painful Bi, and it has not been heard that Xing Bi (Migratory Bi, primarily Wind) also causes pain. The response is: The *Lingshu · Zhou Bi Pian* (Zhou Bi Chapter of the Spiritual Pivot) discusses Zhong Bi (Multiple Bi) and Zhou Bi (General Bi), which refers to this. Furthermore, in the *Sishi Ci Ni Cong Lun Pian* (Discourse on Following or Opposing Needles According to the Four Seasons) of the *Neijing*, it is stated that both excess and deficiency in the Six Channels result in Bi. The commentary states: "Bi means pain." Does this not indicate that pathogenic factors from human activity can also cause pain? Why does this text use one category to summarize numerous diseases? It is likely because the collection is incomplete. Moreover, bodily pain differs according to whether it affects the skin, flesh, vessels, sinews, or bones. Since the pathogenic factors differ, their names must be correctly defined; if the names are incorrect, how can treatment be administered? If the pathogen is one of the Six Excesses (Liu Yin), one must treat the pathogen; if it is a disorder of human Qi, one must tonify or reduce the Qi; if the disease is in the Six Channels and Four Belongings, one must follow the nature of the Qi. Therefore, when formulating prescriptions, one must distinguish the weight, lightness, slowness, and urgency of the herbs, applying them appropriately, so as to align with the intent of the classics.