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Q: Why is fever considered a exterior syndrome? A: When wind-cold pathogens stagnate in the couli (interstices of skin and hair follicles), they cause obstruction leading to heat. This heat manifests as a mild, pervasive warmth (xi xi re), feeling hot to the touch. This heat originates from outside the skin, while the zang-fu organs remain free of heat; this is termed "exterior disease with interior harmony." Let us verify this using the treatises of the *Nei Jing* (Inner Canon). It states: "When wind-cold invades man, it causes the fine hairs to stand erect, the skin pores to close, and heat to arise; this can be cured by sweating." It also states: "Due to cold, the body feels like burning charcoal; once sweat is produced, the pathogen disperses." Furthermore, it says: "When man is injured by cold, he inevitably suffers from heat illness; through profuse sweating, the heat resolves naturally." From this, it is evident that fever belongs to the exterior. Therefore, upon seeing fever, one should recognize it as unresolved exterior pathogenic factors. Even if it has persisted for a month or half a month, dispersing methods should still be employed. Another question arises: Fever is indeed an exterior pathogen. However, if delirium and mania occur, indicating urgent interior syndromes, should treatment focus on the exterior or the interior? The answer is: The classics state, "If the exterior cannot be resolved, do not attack the interior; doing so is a great deviation." If the interior syndrome is extremely urgent, a method combining clearing the interior and releasing the exterior must be used. Add herbs such as Huangqin (Scutellariae Radix), Lianzi (Coptidis Rhizoma), and Zhimu (Anemarrhenae Rhizoma) to clear the interior, while using Jingjie (Schizonepetae Herba), Fangfeng (Saposhnikoviae Radix), and Gegen (Puerariae Lobatae Radix) to release the exterior. If there is fecal impaction and extreme interior heat, first use a clearing and dispersing method, then administer Dahuang Tang (Major Bupleurum Decoction) to purge. Attacking and dispersing proceed simultaneously without hindrance. Another question: Warm-heat diseases also present with fever, yet Mahuang (Ephedrae Herba) and Guizhi (Cinnamomi Ramulus) are not used; instead, Chaihu (Bupleuri Radix) and Gegen are used to resolve it. Why? Answer: In warm-heat diseases, cold pathogens lie dormant between the skin and muscles, fermenting into heat. Once emerging from the interior to the exterior, the symptoms are merely fever, without aversion to cold but with thirst. Therefore, Chai Ge Jie Ji Tang (Bupleurum and Poria Decoction to Release the Muscles) is used for its acrid-cool dispersing action, avoiding the acrid-warm nature of Mahuang and Guizhi which would aid the heat pathogen. Since it is termed "releasing the muscles," it is established for exterior syndromes, and fever is never treated as an interior syndrome here. Another question: According to your words, all fevers occur in the Yang meridians and not in the Yin meridians. However, Zhang Zhongjing stated: "In Shaoyin syndrome, if there is contrary fever, Mahuang Fuzi Xixin Tang (Ephedra, Prepared Aconite, and Asarum Decoction) should be used." What is the reason? Answer: Fever in Shaoyin indicates both exterior and interior cold. This is direct invasion (zhi zhong) combined with external contraction, not a transmitted Shaoyin syndrome from other meridians. Therefore, Mahuang, Xixin (Asari Radix et Rhizoma), and Fuzi (Aconiti Lateralis Radix Praeparata) are used to warm the interior and disperse the exterior, resolving both layers. Direct invasion of Shaoyin originally does not involve fever; the term "contrary fever" implies the presence of concurrent Taiyang exterior syndrome. In summary, for fever resulting from transmission into the interior, clearing agents must be combined with dispersing agents; for fever resulting from direct invasion into the interior, warming agents must be combined with dispersing agents. Thus, it is undeniable that fever belongs to exterior syndromes. Hence it is said: "The Three Yin meridians have no headache and no body heat."