伤寒表不解心下有水气干呕发热而咳或渴或利或噫或小便不利少腹满或喘者小青龙汤主之
伤寒表证不解而水停心下阻肺胃降路胃气上逆而生干呕肺气上逆而生咳嗽或火升金燥而为渴或气阻肺胀而为喘或浊
气上嗳而为噫或清气下泄而为利或小便不利而少腹满急凡此皆水气瘀格之故宜小青龙汤甘草培其中气麻桂发其营卫芍药
清其风木半夏降逆而止呕五味细辛干姜降逆而止咳也
麻黄（三两） 桂枝（三两） 芍药（三两） 甘草（二两炙） 半夏（三两洗） 五味（半升） 细辛（三两） 干
姜（二两）
上八味以水一斗先煮麻黄减二升去上沫内诸药煮取三升去滓温服一升 若微利者去麻黄加芫花如鸡子大熬令赤色
（下利者水邪侮土加芫花以泄水也）若渴者去半夏加栝蒌根三两（栝蒌根清金止渴也）若噫者去麻黄加附子一枚炮（寒
水侮土浊气上逆则为噫加附子暖水而降逆也）小便不利少腹满者去麻黄加茯苓四两（茯苓以泄满也）若喘者加杏仁半斤
去皮尖（杏仁利肺而止喘也）
太阳病小便利者以饮水多必心下悸小便少者必苦里急也
申明上章小便不利少腹满之义小便利者津液渗泄则必发燥渴渴而饮水多者土湿木郁必心下动悸木郁不能泄水而小便
少者水积少腹必苦腹里满急也
伤寒心下有水气咳而微喘发热不渴小青龙汤主之服汤已渴者此寒去欲解也
服汤已而渴者表寒已解里水亦去津液乍耗是以作渴渴者是表解寒去水积化汗而外泄也大青龙证是表阳之盛内有火气
小青龙证是里阳之虚内有水气阴阳一偏逢郁即发大小青龙外解风寒而内泄水火感证之必不可少者也
伤寒表证未解，心下有水气，出现干呕、发热且咳嗽；或者口渴，或者腹泻，或者嗳气，或者小便不利、少腹胀满，或者气喘的，用小青龙汤主治。
伤寒表证未解，水饮停聚在心下，阻碍肺胃的降路，导致胃气上逆而产生干呕，肺气上逆而产生咳嗽；或者火热上升、肺金干燥而产生口渴；或者气机阻滞、肺胀而产生气喘；或者浊气上逆而嗳气；或者清气下泄而腹泻；或者小便不利而少腹满急。凡此种种，都是水气瘀阻格拒的缘故，适宜用小青龙汤：用甘草培补中气，麻黄、桂枝发散营卫（营气和卫气），芍药清泻风木（肝木），半夏降逆以止呕，五味子、细辛、干姜降逆以止咳。
麻黄（三两） 桂枝（三两） 芍药（三两） 甘草（二两，炙） 半夏（三两，洗） 五味子（半升） 细辛（三两） 干姜（二两）
以上八味药，用水一斗，先煮麻黄，减少二升水量，去掉上面的浮沫，加入其余药物，煮取三升药液，去渣滓，温服一升。如果有轻微腹泻的，去掉麻黄，加芫花如鸡蛋大小，炒至赤色（腹泻是水邪侮犯脾土，加芫花以泄水）。如果口渴的，去掉半夏，加栝蒌根三两（栝蒌根清润肺金以止渴）。如果嗳气的，去掉麻黄，加炮附子一枚（寒水侮犯脾土，浊气上逆则产生嗳气，加附子暖水而降逆）。小便不利、少腹胀满的，去掉麻黄，加茯苓四两（茯苓以泄除胀满）。如果气喘的，加杏仁半斤，去皮尖（杏仁利肺气以止喘）。
太阳病，小便通畅的，因为饮水过多，必然心下悸动；小便少的，必然苦于里急（腹部拘急不适）。
申明上一章小便不利、少腹胀满的含义：小便通畅，津液渗泄，必然发生燥渴，口渴而饮水多的人，因脾土湿盛、肝木郁结，必然心下动悸；肝木郁结不能疏泄水液，导致小便少，水积在少腹，必然苦于腹部里急满胀。
伤寒，心下有水气，咳嗽且轻微气喘，发热但不口渴的，用小青龙汤主治。服用汤药后感到口渴的，这是寒气已去、病欲解除的表现。
服用汤药后感到口渴，说明表寒已解，里水亦去，津液暂时耗伤所以作渴。口渴是表解寒去、水积化为汗液向外排泄的标志。大青龙证是表阳亢盛，内有火气；小青龙证是里阳虚弱，内有水气。阴阳一旦偏颇，逢郁即发，大小青龙汤既能外解风寒，又能内泄水火，是感受外邪时必不可少的方剂。
Taiyang disease (disease of the Taiyang channel) exterior syndrome is not resolved, water qi (pathogenic fluid accumulation) stagnates in the epigastrium, presenting with dry retching, fever, and cough; or thirst, or diarrhea, or belching, or dysuria with hypogastric fullness, or wheezing. These are primarily treated with Xiao Qing Long Tang (Minor Blue Dragon Decoction).
When the exterior syndrome of Taiyang disease is not resolved, water retention in the epigastrium obstructs the descending pathways of the Lung and Stomach. Stomach Qi rebels upward causing dry retching, and Lung Qi rebels upward causing cough. Fire rises and Metal dries causing thirst; Qi obstruction causes Lung distension leading to wheezing; turbid Qi rebels upward causing belching; clear Qi descends downward causing diarrhea; or dysuria leads to hypogastric urgency and fullness. All these conditions result from the stasis and blockage of water qi. It is appropriate to use Xiao Qing Long Tang: Gan Cao (Licorice Root) to nourish Middle Qi; Ma Huang (Ephedrae Herba) and Gui Zhi (Cinnamon Twig) to disperse Ying Wei (Nutritive and Defensive Qi); Shao Yao (Paeoniae Radix Alba) to clear Wind Wood (Liver Wood); Ban Xia (Pinelliae Rhizoma) to descend rebellion and stop retching; Wu Wei Zi (Schisandrae Fructus), Xi Xin (Asari Radix et Rhizoma), and Gan Jiang (Zingiberis Rhizoma) to descend rebellion and stop cough.
Ma Huang (Ephedrae Herba, 3 liang) Gui Zhi (Cinnamomi Ramulus, 3 liang) Shao Yao (Paeoniae Radix Alba, 3 liang) Gan Cao (Glycyrrhizae Radix et Rhizoma, 2 liang, honey-fried) Ban Xia (Pinelliae Rhizoma, 3 liang, washed) Wu Wei Zi (Schisandrae Fructus, half sheng) Xi Xin (Asari Radix et Rhizoma, 3 liang) Gan Jiang (Zingiberis Rhizoma, 2 liang)
Take the above eight herbs, add one dou of water, first boil Ma Huang until the volume reduces by two sheng, remove the foam on the surface, then add the remaining herbs. Boil until three sheng remain, strain, and take one sheng warm. If there is slight diarrhea, remove Ma Huang and add Yuan Hua (Daphnes Genkwa Flos) the size of a chicken egg, stir-fried until red (Diarrhea indicates Water Evil insulting Earth; Yuan Hua is added to drain water). If there is thirst, remove Ban Xia and add Gua Lou Gen (Trichosanthis Radix, 3 liang) (Gua Lou Gen clears Metal and stops thirst). If there is belching, remove Ma Huang and add Fu Zi (Aconiti Lateralis Radix Praeparata, one piece, processed) (Cold Water insulting Earth and turbid Qi rebelling upward causes belching; Fu Zi warms Water and descends rebellion). If there is dysuria and hypogastric fullness, remove Ma Huang and add Fu Ling (Poria, 4 liang) (Fu Ling drains fullness). If there is wheezing, add Xing Ren (Armeniacae Semen Amarum, half jin), skin and tips removed (Xing Ren benefits the Lung and stops wheezing).
In Taiyang disease, if urination is free, drinking too much water will certainly cause palpitations in the epigastrium; if urination is scanty, there will certainly be distressing internal urgency.
This clarifies the meaning of dysuria and hypogastric fullness mentioned in the previous chapter: If urination is free, body fluids seep away, inevitably causing dry thirst. Those who drink heavily due to thirst suffer from Spleen Earth dampness and Liver Wood depression, leading to palpitations in the epigastrium. If Liver Wood depression fails to vent water, urination becomes scanty, water accumulates in the hypogastrium, and there is distressing abdominal internal urgency and fullness.
In Taiyang disease, if there is water qi in the epigastrium, cough with slight wheezing, fever but no thirst, treat with Xiao Qing Long Tang. If thirst occurs after taking the decoction, this indicates that cold has departed and the disease is about to resolve.
Thirst after taking the medicine indicates that exterior cold has resolved and interior water has gone; body fluids are temporarily consumed, hence the thirst. Thirst signifies that the exterior is resolved, cold has left, and accumulated water transforms into sweat and exits outward. Da Qing Long Tang (Major Blue Dragon Decoction) syndrome represents excess Yang at the exterior with Fire inside; Xiao Qing Long Tang syndrome represents deficiency of Interior Yang with Water inside. When Yin and Yang become biased, they manifest upon obstruction. Both Major and Minor Blue Dragon Decoctions can release Wind-Cold from the exterior and drain Water-Fire from the interior; they are indispensable for treating such pathogenic patterns.