伤寒、感寒、中寒、及外感内伤,虚实迥别,治法悬绝,书未洞悉其详,后学何从
辨别,误投误杀,臭可底止。盖伤寒者,冬月受寒,即病之名也。夫冬时杀厉之寒过
甚,偶失调护,得以犯之,但阳气闭藏敛纳,中气不甚空虚,外邪何能重人?所以,
身发壮热,由表入里,次第传经。善治之者,散其外邪,调其营卫,而病自己,岂其
必俟传足六经,以竟其局耶!感寒者,外寒虽甚轻,然当时令阳气升浮在表,且我正气
甚虚,足以感之,身或微热,或不热,六脉无力,神气困倦,当温以调之,而病自愈
也,至于中寻者,由人中气元阳亏极,又遇强暴之寒邪,直中于中,手足厥冷,息微体
倦,六脉沉细语言无力,身不发热,即微热而口不满,此时不急峻用温补以保之,则几
希之元阳失散,残灭乃易易耳。书云∶宜急温之,迟则不救。故术附、参附、理中、四
逆,皆为此等设也。至于外感内伤,尤须剖明脉诀,以左关人迎脉大为外感。然外感之
中,尤有内伤之辨,外感恶寒,虽近烈火不除;内伤恶寒,得就温暖即解。外感鼻气不
利;内伤口不知味。外感邪气有余,故发言壮厉;内伤元气不足,故出言懒怯。外感头
痛,常痛不休;内伤头痛,时作时止。外感手背热;内伤手心热。脉诀以右关气口脉大
为内伤,此谓内伤饮食,有余症也,宜消之。至于书论治法,云外感少内伤多,只须
温补不可发散,此言元气内伤,非饮食之谓也。证属天渊,治者从何作主,故宜分饮食
伤为有余,劳倦伤为不足,此即《内经》饮食劳倦,损伤脾胃之义。然内伤劳倦,中气
即虚,外感虚人,略缓时日,未有表病而不累及里者,未有受病而不伤人正气者。初病
当分内外,久则统致一虚,故诸病身发壮热者、脉洪数有力者、掀衣气粗者、语言不倦
者、发渴喜冷者,皆为有余。若不发热及微热者,脉沉细弦缓无力者,里衣密处者,语
言无力者,微渴喜热者,及不渴者,皆为不足。有余为阳症客病,不足为阴症主病耳。
伤寒、感寒、中寒,以及外感与内伤,虚实截然不同,治疗方法也相差极大。如果书籍未能详尽阐明这些细节,后学者从何辨别?误用药物导致死亡,后果不堪设想。
所谓伤寒,是指冬季感受寒邪,随即发病的疾病名称。因为冬季肃杀凛冽的寒气过于强烈,如果偶然调护失当,寒气便能侵犯人体。但此时人体阳气闭藏收敛,中气(脾胃之气)并不十分空虚,外邪怎能深入?所以,身体出现高热,病邪由表入里,依次传变经络。善于治疗的人,疏散其外邪,调和营卫,疾病自然痊愈,难道一定要等到病邪传遍足部六经,才结束病程吗!
所谓感寒,是指外来的寒气虽然很轻微,但在当时令阳气升浮于体表之际,且我人体正气非常虚弱,足以被寒气所感应。身体或许微热,或者不发热,六脉无力,精神困倦,应当用温法调理,疾病自然痊愈。
至于中寒,是由于人中气元阳亏损到了极点,又遇到强暴的寒邪,直中于中焦。表现为手足厥冷,气息微弱,身体疲倦,六脉沉细,说话无力,身体不发热,即使有微热也不愿多穿衣。此时如果不紧急峻烈地使用温补之法来保护元气,那么仅存的元阳就会散失,灭亡就非常容易了。医书说:“应当紧急温补,迟缓则无法救治。”因此,白术附子汤、人参附子汤、理中汤、四逆汤,都是为这类病症设立的。
至于外感与内伤,尤其需要仔细辨析脉诀。左关人迎脉大为外感。然而在外感之中,尤其要辨别是否有内伤。外感恶寒,即使靠近烈火也不能缓解;内伤恶寒,得到温暖即可解除。外感者鼻息不利;内伤者口不知味。外感因邪气有余,所以发言声音壮厉;内伤因元气不足,所以说话懒弱怯懦。外感头痛,常常疼痛不止;内伤头痛,时作时止。外感手背发热;内伤手心发热。脉诀认为右关气口脉大为内伤,这是指内伤饮食,属于有余之症,应当用消导法治疗。至于书中论述治法,说外感少而内伤多,只需温补不可发散,这是指元气内伤,并非指饮食积滞。证候如同天渊之别,医者从何着手?因此应当区分饮食伤为有余,劳倦伤为不足,这正是《内经》中饮食劳倦损伤脾胃的含义。然而内伤劳倦,中气即虚;外感虚人,稍微拖延时日,没有表病而不累及里的,也没有受病而不伤害正气的。初病应当分辨内外,久病则统统一致归于虚证。所以,凡是身体发高热、脉洪数有力、掀开衣服、呼吸气粗、言语不停、口渴喜冷饮的,都属于有余。若不发热或微热、脉沉细弦缓无力、在里衣密闭处仍觉冷、言语无力、微渴喜热饮或不渴的,都属于不足。有余属于阳证客病,不足属于阴证主病罢了。
Shanghan (Cold Damage), Ganhan (Sensation of Cold), Zhonghan (Strike of Cold), as well as Waigan (External Contraction) and Neishang (Internal Injury), differ significantly in deficiency and excess, and their treatment methods are vastly different. If texts fail to elucidate these details thoroughly, how can later learners distinguish them? Misapplication of treatments leading to death would be unbearable.
Shanghan refers to the disease contracted immediately after exposure to cold in winter. Although the killing cold of winter is severe, if one occasionally fails in care, it can invade the body. However, at this time, Yang Qi is closed and stored, and the Middle Qi (Spleen and Stomach Qi) is not extremely deficient, so how can external pathogens penetrate deeply? Therefore, the body develops high fever, and the pathogen enters from the exterior to the interior, transmitting through the meridians step by step. A skilled practitioner disperses the external pathogens and harmonizes Ying and Wei (Nutritive and Defensive Qi), and the illness resolves itself. Does it necessarily have to wait for the pathogen to transmit through the six Foot meridians before concluding the course?
Ganhan occurs when external cold is slight, but during the season when Yang Qi ascends and floats on the surface, and our own Zheng Qi (Upright Qi) is very weak, making us susceptible to sensation by cold. The body may have slight fever or no fever, the six pulses are powerless, and spirit is fatigued. It should be treated with warming methods to regulate, and the illness will heal spontaneously.
As for Zhonghan, it arises because the person's Yuan Yang (Primordial Yang) in the middle jiao is extremely depleted, and upon encountering violent cold pathogens, they strike directly into the middle. Symptoms include cold extremities, faint respiration, physical fatigue, deep and fine pulses, weak speech, no fever, or even if there is slight fever, the patient does not desire to remove coverings. At this moment, if urgent and potent warming and tonifying methods are not used to preserve the Yuan Yang, the remaining Primordial Yang will dissipate, and demise will be easy. The text states: "It is appropriate to urgently warm; delay means no rescue." Therefore, Baizhu Fuzi Tang (Atractylodes Macrocephala and Prepared Aconite Decoction), Renshen Fuzi Tang (Ginseng and Prepared Aconite Decoction), Lizhong Tang (Regulate the Middle Decoction), and Sini Tang (Reverse the Cold Decoction) are all established for such conditions.
Regarding Waigan and Neishang, pulse diagnosis must be clarified. An enlarged Renying pulse at the left Guan position indicates Waigan. However, within Waigan, differentiation from Neishang is crucial. In Waigan, aversion to cold persists even near a fierce fire; in Neishang, aversion to cold resolves with warmth. In Waigan, nasal breathing is obstructed; in Neishang, taste perception is lost. Waigan involves excess pathogens, hence speech is loud and vigorous; Neishang involves deficiency of Yuan Qi, hence speech is lazy and timid. Waigan headache is constant and unceasing; Neishang headache comes and goes. Waigan presents with heat on the back of the hands; Neishang presents with heat in the palms. Pulse diagnosis holds that an enlarged Qikou pulse at the right Guan position indicates Neishang, specifically referring to dietary injury, which is an excess syndrome suitable for resolution/digestion methods. Regarding treatment principles in texts stating "Waigan is rare, Neishang is common, only warming and tonifying are needed, no dispersing," this refers to internal injury of Yuan Qi, not dietary accumulation. The syndromes are as different as heaven and earth; how should practitioners decide? Thus, dietary injury should be distinguished as excess, and fatigue injury as deficiency. This aligns with the meaning in Nei Jing (Inner Canon) that diet and fatigue damage the Spleen and Stomach. However, Neishang from fatigue implies deficiency of Middle Qi; Waigan in deficient persons, if delayed slightly, invariably involves the interior without just the exterior, and contracting disease inevitably harms Zheng Qi. Initial illness requires distinguishing internal and external; prolonged illness converges into a single deficiency. Therefore, those with high fever, surging rapid forceful pulses, uncovering clothes, coarse breathing, incessant speech, thirst preferring cold drinks, are all excess. Those without fever or with slight fever, deep fine wiry slow powerless pulses, feeling cold even under inner layers, weak speech, slight thirst preferring hot drinks or no thirst, are all deficiency. Excess constitutes Yang syndromes and exogenous diseases; deficiency constitutes Yin syndromes and endogenous diseases.