问曰∶发热何以是表证？答曰∶风寒郁于腠理，则闭塞而为热。翕翕然作，摸之烙手，
此热即发于皮肤之外，而脏腑无热，名曰表病里和。试以《内经》诸论证之，曰风寒客于人
使人毫毛毕直，皮肤闭而为热，可汗而已。又曰因于寒，体若燔炭，汗出而散。又曰人之
伤于寒也，则不免于病热，大汗，热自解也。由是观之，热之属表明矣。故一见发热，即属
表邪未解，虽一月、半月之久，还当发散。又问曰∶发热固为表邪，倘谵语发狂，里证复急
者，治从表乎？从里乎？答曰∶经云解表不开，切勿攻里，攻之为大逆。若里证甚急须用清中
兼表之法，加芩、连、知母之类以清里，而用荆、防、葛根之类以发表。大便闭结，里热极
甚者，先用清散之法，然后用大柴胡汤下之，攻散并行，不相妨也。又问曰∶温热病亦发热
不用麻黄、桂枝，而用柴葛以解之，何也？对曰∶温热病者，寒邪伏于肌肤之间，酝酿成
热，一旦自里达表，其证但发热，不恶寒而口渴，故用柴葛解肌汤辛凉以散之，不用麻黄、
桂枝之辛温以助热邪也。然既曰解肌，即为表证设，亦未尝以发热为里证也。又问曰∶据子
之言，凡发热皆在阳经而不在阴经，仲景云∶少阴证反发热者，当用麻黄附子细辛汤，何以
故？对曰∶少阴发热者，表里皆寒，是直中而兼外感，非传经少阴也。故用麻黄、细辛、附
子温中发散，令表里两解。夫直中少阴，本无发热，而曰反发热者，盖兼太阳表证也。总之
传经入里而发热，清药中必兼发散；直中入里而发热，温药中必兼发散，可见发热属表证无
可疑惑，故曰∶三阴无头痛，无身热。
问：为什么发热属于表证？答：风寒邪气郁结在腠理（皮肤纹理及汗孔），导致闭塞不通从而产生发热。这种热象表现为身体如羽毛覆盖般烘热，触摸时烫手，这种热发于皮肤之外，而脏腑内部没有热邪，称为“表病里和”。试以《黄帝内经》中的论述来验证：其一，说风寒侵袭人体，使人毫毛竖立，皮肤闭塞而产生发热，可以通过发汗的方法治愈。其二，说因受寒邪，身体像燃烧的炭火一样滚烫，出汗后邪气便消散。其三，说人受到寒邪伤害，就难免出现热病，通过大汗出，热邪自然解除。由此看来，发热归属于表证是明确的。所以一见到发热，就属于表邪未解，即使经过一个月、半个月的时间，仍然应当使用发散的方法治疗。又问：发热固然属于表邪，如果出现胡言乱语、发狂等里证紧急的情况，治疗应该从表论治还是从里论治？答：经典著作中说，如果解表不顺利，千万不要攻下里实，否则是大逆之举。如果里证非常紧急，必须采用清里兼解表的方法，加入黄芩、黄连、知母等药物来清泄里热，同时使用荆芥、防风、葛根等药物来发表散邪。如果大便闭结，里热极盛，先用清散的方法，然后再用大柴胡汤攻下，攻邪与散邪并行，互不妨碍。又问：温热病也出现发热，但不使用麻黄、桂枝，而是用柴胡、葛根来解表，这是为什么呢？答：温热病患者，寒邪潜伏在肌肤之间，酝酿化热，一旦从里达表，其症状只是发热，不恶寒且口渴，所以使用柴葛解肌汤辛凉发散，不使用麻黄、桂枝的辛温性质以免助长热邪。既然称为解肌，就是为表证设立的，也未尝把发热当作里证。又问：根据您的说法，凡是发热都在阳经而不在阴经，张仲景说：少阴病反而发热的，应当使用麻黄附子细辛汤，这是什么原因？答：少阴病发热，是表里皆寒，这是寒邪直中脏腑兼有外感，不是由他经传变而来的少阴病。所以使用麻黄、细辛、附子温补中焦并发散表邪，使表里两解。所谓直中少阴，原本没有发热，所说的“反发热”，是因为兼有太阳表证。总之，传经入里而发热，清热药中必须兼用发散药；直中入里而发热，温补药中必须兼用发散药，可见发热属于表证无可怀疑，所以说：三阴病没有头痛，没有身热。
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."