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《伤寒论》第23条学习笔记-桂枝麻黄各半汤

  • 2026-11-05 00:17:05
《伤寒论》第23条学习笔记-桂枝麻黄各半汤

一、原文

【原文】

太阳病,得之八九日,如疟状,发热恶寒,热多寒少,其人不呕,清便欲自

可,一日二三度发。脉微缓者,为欲愈也;脉微而恶寒者,此阴阳俱虚,

不可更发汗、更下、更吐也;面色反有热色者,未欲解也,以其不能得小汗

出,身必痒,宜桂枝麻黄各半汤。

二、词解

1. 如疟状:发热恶寒交替发作,一日二三度发,状似疟疾之寒热往来,然非真疟。为邪正交争于表、营卫出入不利所致。

2. 热多寒少:发热多于恶寒。提示邪气郁遏偏于阳分,有化热之趋势,然病位仍在太阳之表。

3. 清便欲自可:"清"通"圊",指排便;欲自可,言大小便尚属正常。说明里气调和,邪未入里传变。

4. 脉微缓:微为邪气已衰,缓为正气来复,二脉并见,乃邪退正复、病将自愈之征。

5. 阴阳俱虚:误治伤正后,表里阴阳气血皆不足之谓。此处专指邪已衰而正亦虚,不可再行汗、吐、下。

6. 面色反有热色:面色微红而有热象。为阳气怫郁于表、不得宣散之表现。"反"字提示此非欲愈之佳兆。

7. 身必痒:汗出不彻,邪气郁于肌表,卫气疏布不利,风邪留滞肌腠所致。

三、病机分析

太阳病得之八九日,正气渐复,邪气渐衰,正邪交争于表,故见如疟状之发热恶寒。本条以脉证为纲,论述三种转归:

(1)欲愈之候:脉微缓——微者邪衰,缓者正复,正胜邪却,病将自愈,无需用药;

(2)虚损之候:脉微而恶寒——邪虽衰而正亦虚,阴阳俱不足,此时不可再行发汗、攻下、涌吐,犯之则虚其所虚;

(3)未解之候:面色反有热色、身痒——邪气未尽,郁于肌表,阳气怫郁不得外达。此非正虚,乃表郁不彻,宜微发其汗。

三者之中,前两者不治,后者方治——治亦不过"小汗"而已,可见仲景辨证之精细。

四、方药组成与方义

桂枝麻黄各半汤方

桂枝一两十六铢(去皮) 芍药 生姜(切) 甘草(炙) 麻黄(去节)各一两 大枣四枚(擘) 杏仁二十四枚(汤浸去皮尖及两仁者)

上七味,以水五升,先煮麻黄一二沸,去上沫,内诸药,煮取一升八合,去滓,温服六合。

方义

本方即桂枝汤与麻黄汤各取其半、合而小制。桂枝汤调和营卫、解肌祛风,麻黄汤开腠发汗、宣肺透邪;两方合用,剂量轻微,旨在"小发其汗",使表邪从微汗而解,又不致过汗伤正。

合方之妙,详见下节思辨。

五、【重点思辨】为什么用桂枝麻黄各半汤?

【核心问题】

邪郁在表,为何不单用桂枝汤,亦不单用麻黄汤,而必以二方各半合之?

1. 病机定位:表郁不彻,营卫不和

本条"未解"之病机,是邪气留恋肌表、汗出不彻,阳气怫郁不得外达。其特点有三:邪轻、正亦不盛、郁而不重。面有热色而身痒,正是"欲汗不得汗"之象。

2. 单用一方,皆有不宜

(1)单用桂枝汤:桂枝汤本为解肌和营之剂,发汗力弱,须啜粥温覆方能取汗。今表邪郁闭、腠理不开,桂枝汤力不足以开表透邪;

(2)单用麻黄汤:麻黄汤为峻汗之剂,发汗力猛。今邪势已减、正气不充,若用峻汗,必致过汗伤正,甚至转成阴阳俱虚之变。

3. 各半合方:量小而力专

桂枝汤合麻黄汤,各取其半,剂量极轻——桂枝、芍药、生姜、甘草、麻黄各一两,杏仁仅二十四枚,大枣四枚。如此则:

(1)发汗之力介于两方之间,微汗透邪而不伤正;

(2)既开表闭以散邪,又和营卫以调内,表里兼顾;

(3)药少量轻,邪轻之证正宜轻剂,所谓"治上焦如羽,非轻不举"。

4. 辨证

用各半汤之关键:面有热色、身痒而脉不沉不紧、无汗而欲汗。若见脉微恶寒(阴阳俱虚),则各半汤亦不可用,此即本条三层次辨证之精义。

六、辨证要点

1. 病程:太阳病得之八九日,病势已缓;

2. 热型:如疟状,发热恶寒,热多寒少,一日二三度发;

3. 里和无病:其人不呕(邪未入少阳)、清便欲自可(邪未入阳明);

4. 三种转归辨证眼目:

——脉微缓:邪退正复,欲愈,不药而愈;

——脉微而恶寒:阴阳俱虚,禁汗、吐、下三法;

——面色反有热色、身痒:阳气怫郁,表邪未解,宜桂枝麻黄各半汤。

七、类方鉴别

方名

组成特点

病机

主症

桂枝汤

桂枝+芍药+姜枣草

营卫不和

发热恶风,

汗出,脉浮缓

麻黄汤

麻黄+桂枝+杏仁+甘草

表寒闭郁,卫阳被遏

无汗身痛,

恶寒重,脉浮紧

桂枝麻黄各半汤

二方各半,小量合方

邪郁表闭,营卫不和,邪轻正不盛

如疟状,热多寒少

,身痒,脉微

八、临床应用拓展

1. 感冒迁延不愈:表邪未尽、余邪留恋,发热恶寒轻作、汗出不彻者;

2. 荨麻疹、皮肤瘙痒:风寒束表、营卫不和、邪郁肌腠者,本方加减有验;

3. 汗出不畅之身痒:发热微恶寒而身痒,属"不能得小汗出"者;

4. 使用要点:邪轻、表郁不重、正气无明显虚损者宜之;若脉微恶寒之阴阳俱虚证,禁用。

九、关联条文与辨证层次

第25条:服桂枝汤大汗出后,脉洪大者,与桂枝汤如前法;若形似疟、一日再发者,汗出必解,宜桂枝二麻黄一汤。

——同为"合方微汗"之例,但彼为大汗后邪微,此为本证邪轻而表郁,皆体现"小制其量、微发其汗"之法。

第27条:太阳病,发热恶寒,热多寒少……脉微弱者,此无阳也,不可发汗,宜桂枝二越婢一汤。

——同为"热多寒少",然越婢一汤兼清里热,各半汤纯开表郁;一含石膏,一不用石膏,层次分明。

由第23条可见仲景辨证之精微:同为表证,须辨邪之轻重、正之虚实,而后定汗法之峻缓。

十、小结

本条以"如疟状、热多寒少"为主症,以脉为纲分出三层转归:脉微缓者欲愈而不治,脉微恶寒者阴阳俱虚而禁汗吐下,面有热色、身痒者表郁未解而宜小汗。桂枝麻黄各半汤以二方各半、量小而合,微发其汗、调和营卫,正合"邪轻正不盛"之病机。此条与第21条同示经方制方之精——去一味、合一方,皆因证而立,随证而变。

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  1. CONNECT:[ UseTime:0.000763s ] mysql:host=172.18.0.4;port=3306;dbname=h_sjds;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000981s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000421s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000430s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000659s ]
  6. SELECT * FROM `set` [ RunTime:0.000286s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000700s ]
  8. SELECT * FROM `article` WHERE `id` = 575775 LIMIT 1 [ RunTime:0.000396s ]
  9. UPDATE `article` SET `lasttime` = 1793948697 WHERE `id` = 575775 [ RunTime:0.001742s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.000345s ]
  11. SELECT * FROM `article` WHERE `id` < 575775 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000446s ]
  12. SELECT * FROM `article` WHERE `id` > 575775 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000366s ]
  13. SELECT * FROM `article` WHERE `id` < 575775 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.000569s ]
  14. SELECT * FROM `article` WHERE `id` < 575775 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.000769s ]
  15. SELECT * FROM `article` WHERE `id` < 575775 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.000635s ]
0.090958s