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Heat-dampness pathogenic factor causes no thirst, while dry-heat pathogenic factor causes thirst; this distinguishes damp-fire from dry-fire based on the presence or absence of thirst. Heat in the blood level causes no thirst, while heat in the qi level causes thirst; this distinguishes heat located in the blood level from that in the qi level based on thirst. Accumulation of phlegm and food stagnation in the stomach leads to thirst but an inability to metabolize water; injury by evil heat in the stomach leads to thirst and the ability to metabolize water. This distinguishes phlegm-food accumulation from excess heat based on the ability to metabolize water. Excess fire causing thirst presents with a surging and rapid pulse and the ability to metabolize water; deficiency fire causing thirst presents with a deficient and rapid pulse and an inability to metabolize water. This distinguishes deficiency fire from excess fire based on the pulse's deficiency or excess and the ability to metabolize water. Evil heat at the exterior causes no thirst, while evil heat at the interior causes thirst; this distinguishes heat at the exterior from heat at the interior based on thirst. Taiyang (Greater Yang) exterior heat causes no thirst; if heat enters the interior of the Bladder, it causes vexation, thirst, rapid pulse, and difficult urination. In such cases, Wuling San (Five-Ingredient Powder with Poria) should be used to resolve both the exterior and interior simultaneously. One must not confuse this with the thirst occurring after sweating resolves heat in Yangming (Yang Brightness) disease, nor mistakenly use Baihu Tang (White Tiger Decoction), as this would hinder the resolution of Taiyang exterior pathogens. Yangming exterior heat presents with no sweat and thirst, treated with Gegen Tang (Kudzu Root Decoction) to induce sweating. If evil heat enters the Yangming meridian, presenting with sweating, thirst, and a surging, rapid pulse, Baihu Tang is used to clear heat. If heat binds in the lower jiao, causing difficult urination and thirst, Zhuling Tang (Polyporus Decoction) is indicated. One must not confuse this with Taiyang difficult urination and mistakenly use Wuling San, which would hinder Yangming interior heat. If evil heat transmits to the Yangming fu organs, presenting with a dry tongue, thirst, constipation, and excessive sweating on the hands and feet, along with indications for purgation, Chengqi Tang (Purge the Gangrene Decoction) is used. Shaoyang (Lesser Yang) interior heat presents with bitter taste, dry throat, wiry-rapid pulse, and thirst, treated with Xiaochaihu Tang (Minor Bupleurum Decoction), removing Banxia (Pinellia Rhizome) and adding Tianhuafen (Trichosanthes Root). When heat from the three yang meridians transmits to the three yin meridians, deep heat with cold extremities (Re Shen Jue Shen) may occur, with cold hands and feet and thirst, yet the pulse is necessarily rapid, consciousness is dull, and urine is red. This is thirst in a Yang syndrome resembling Yin (Yang Zheng Si Yin), still treated with Baihu Tang and Liangge San (Cooling the Diaphragm Powder). Additionally, external Yang-toxin heat disease presents with red eyes, black lips, and extreme thirst with desire to drink, treated with Sanhuang Jusheng Tang and Liangge San. Summerheat causing vexation and thirst is treated with Gegen Shigao Tang mixed with Chensha Liuyi San. Autumn heat injuring dryness causing thirst is treated with pear juice and watermelon juice. If ineffective, Shigao Qingzao Tang is used. Winter warmth and spring heat, or epidemic diseases causing thirst, are considered approaching recovery when the patient desires water and can metabolize it, as water entering the stomach harmonizes stomach qi, distributes throughout the body, transforms into sweat, and releases externally, resolving heat and thirst. If drinking is prohibited, stomach fluids dry up, sweat cannot form, and heat remains unresolved. Generally, all thirst symptoms are caused by stomach heat in the Yangming qi level; thus, Gegen (Kudzu Root) and Shigao (Gypsum Fibrosum) are essential herbs for treating thirst. Gegen disperses stagnant heat in the Yangming exterior, while Shigao clears and moistens Yangming interior heat. Some cases where continuous use of Shigao and Zhimu (Anemarrhena Rhizome) fails to reduce thirst are cured later with Gegen, indicating Yangming exterior heat thirst. Some cases where continuous use of Gegen fails to reduce thirst are cured later with Shigao and Zhimu, indicating Yangming interior heat thirst. Although both are Yangming meridian diseases using Yangming herbs, failure to distinguish between exterior and interior heat results in ineffectiveness. For example, dry mouth and scorched lips with an inability to metabolize water, unresponsive to Gegen and Shigao, and also unresponsive to treatments for phlegm-food stagnation, indicate heat lurking in the Yangming blood level, causing scorched lips without thirst. Changing to Shengma Qingwei Tang (Corydalis Decoction to Clear the Stomach) clears the lurking fire in the Yangming blood level, curing the condition, which is common. In miscellaneous diseases, thirst may stem from Lung Xiao or Kidney Xiao (deficiency syndromes). However, in Shanghan (Cold Damage) heat diseases, the focus is solely on Yangming meridian heat. Even if Shaoyin (Lesser Yin) presents with dry mouth and throat with thirst, or Jueyin (Terminal Yin) presents with Xiao Ke (wasting-thirst) and desire to drink, these are heat diseases transmitted from Yangming to the three yin meridians. Therefore, Zhang Zhongjing did not establish formulas for nourishing yin and tonifying blood. The mention of nourishing yin herbs in the context of dry mouth and throat is because they treat thirst caused by blood deficiency generating heat, not thirst caused by flourishing external heat pathogens. Wind-stroke fever persisting for six to seven days with vexation, presenting both exterior and interior symptoms, with desire to drink water that is immediately vomited, is named Shui Ni (Water Reversal), treated with Wuling San. Drinking warm water frequently induces sweating and cure. This chapter begins by highlighting excessive sweating and fever, unresolved vexation, and desire to drink, indicating Taiyang has both exterior and interior aspects, requiring Wuling San to drain the exterior and interior from above and below, rather than using single-action exterior-resolving or interior-clearing drugs.

In Taiyang disease, after inducing sweating, if excessive sweating occurs, leading to dryness in the stomach, vexation, insomnia, and desire to drink, provide small amounts of water; when stomach qi harmonizes, the patient recovers. If the pulse is floating, urination is difficult, there is slight fever, and extreme thirst, administer Wuling San.

This chapter distinguishes cases where Wuling San is contraindicated from those where its method is appropriate. The first paragraph describes post-sweating excessive sweating, stomach dryness, vexation, and desire to drink, lacking "floating pulse and difficult urination"; only water should be given, not Wuling San. The second paragraph includes "floating pulse and difficult urination"; Wuling San is necessary. Previous scholars noted the formula at the end and assumed it treats the entire chapter, which is erroneous.

After inducing sweating, if the pulse is floating and rapid with vexation and thirst, Wuling San is indicated.

After inducing sweating, if the pulse is floating and rapid without vexation or thirst, sweating may be induced again. Current vexation and thirst indicate heat binding in the interior of Taiyang, so Wuling San is used to resolve both exterior and interior. Thus, Wuling San is applicable only for Taiyang difficult urination with floating pulse, vexation, and thirst. For Yangming vexation and thirst with difficult urination, Zhuling Tang is appropriate.

In Shanghan, sweating with thirst is treated with Wuling San. Sweating without thirst is treated with Fuling Gancao Tang.

This chapter clarifies that for Shanghan sweating due to wind injuring the Wei (Defensive) level, one must distinguish between thirst and no thirst. Thirst indicates internal heat binding, warranting Wuling San. No thirst indicates no internal heat binding, contraindicating Wuling San. Observing Zhang Zhongjing's use of Wuling San, it is emphasized not primarily for difficult urination, but detailed in contexts of intense thirst, fever, excessive sweating, and persistent exterior heat. This indicates its intent is to resolve both exterior and interior, draining Taiyang from above and below, not merely to promote diuresis.

Initially due to incorrect purgation, epigastric fullness (Pi) occurs, treated with Xiexin Tang. If Pi persists, accompanied by thirst, oral vexation, and difficult urination, Wuling San is indicated.

Incorrect purgation of Taiyang causes epigastric fullness, treated with Xiexin Tang. If Pi persists, followed by thirst, vexation, and difficult urination, Taiyang pathogens have sunk inward due to purgation, binding in the Bladder. Wuling San is used to resolve both exterior and interior. The preceding five paragraphs repeatedly warn against using Wuling San for excessive sweating, unresolved heat, thirst, and vexation. Typically, unresolved exterior heat uses exterior-resolving drugs; thirst and vexation use heat-clearing drugs. Here, sweating with unresolved exterior heat plus thirst and water metabolism indicates a combined Taiyang exterior-interior syndrome, requiring simultaneous resolution of both, not merely exterior resolution.

After taking Guizhi Tang (Cinnamon Twig Decoction), if excessive sweating occurs followed by severe vexation, unresolved thirst, and a surging pulse, Baihu Jia Renshen Tang (White Tiger Decoction with Ginseng) is indicated.

Vexation and thirst are typically Baihu Tang indications. However, aversion to cold with no sweat and thirst, floating or fine pulse with thirst, hidden pulse with inability to metabolize water and thirst, and Taiyang excessive sweating with unresolved exterior heat and interior-exterior heat binding causing thirst are all contraindications for Baihu Tang. This refers to the state after Guizhi Tang induces excessive sweating, leading to severe vexation, thirst, and surging pulse, indicating resolved exterior and interior heat in Yangming, hence Baihu Tang is used.

In Shanghan, if the pulse is floating, fever present with no sweat, and the exterior is unresolved, Baihu Tang is contraindicated. If there is desire to drink water without exterior symptoms, Baihu Jia Renshen Tang is indicated.

The previous chapter clarified indications for Baihu Tang; this chapter warns against using it if exterior pathogens remain. If Shanghan presents with floating pulse, fever, no sweat, and unresolved exterior symptoms, Baihu Tang is forbidden. Even with desire to drink water, one must ensure no exterior symptoms remain before administering Baihu Tang.

In Shanghan, if there is no significant fever, thirst, vexation, and slight aversion to cold on the back, Baihu Jia Renshen Tang is indicated.

The previous chapter guarded against using Baihu Tang for exterior symptoms; this chapter warns that dry mouth/thirst and vexation risk immediate depletion of fluids. Thus, even with slight aversion to cold on the back, if there is no significant fever, dry mouth/thirst, and vexation, interior heat is extreme, and Baihu Tang is still used.

In Shanghan, if after emesis or purgation, the disease persists for seven to eight days, heat binds in the interior, exterior and interior are both hot, there is occasional aversion to wind, extreme thirst, dry tongue with vexation, and desire to drink several liters of water, Baihu Jia Renshen Tang is indicated.

Shanghan persisting for seven to eight days with heat binding in the interior, dry tongue, and vexation requiring several liters of water to quench thirst warrants Baihu Tang. Since emesis or purgation was performed, Renshen (Ginseng) is added to rescue fluids.

In Yangming disease, if the pulse is floating and tight, throat is dry, taste is bitter, abdomen is full and distended with panting, fever and sweating occur, aversion to cold is absent replaced by aversion to heat, body feels heavy, mind feels agitated (Aonao), and tongue coating is white, Zhizi Chi Tang (Gardenia and Fermented Soybean Decoction) is used. If there is desire to drink water with dry mouth and tongue, Baihu Jia Renshen Tang is used. If pulse is floating, fever present, desire to drink water, and difficult urination, Zhuling Tang is used.

This chapter outlines three treatment methods. Detailed notes are in the "Aonao" section. Zhizi Chi Tang treats agitation with white tongue coating. Baihu Jia Renshen Tang treats desire to drink water, clearing upper jiao Yangming heat. If difficult urination is added, Zhuling Tang clears lower jiao Yangming heat binding.

In Yangming disease, if sweating is excessive and thirst is present, Zhuling Tang is contraindicated. Excessive sweating dries the stomach; Zhuling Tang further promotes diuresis, depleting fluids.

The previous chapter established Zhuling Tang indications; this chapter prevents its use in patients with excessive sweating (fluid loss) and thirst (internal fluid deficit).

In Shanghan or wind-stroke after five to six days, with alternating chills and fever, chest and hypochondriac fullness, silent desire not to eat, vexation and frequent vomiting, optionally thirst, abdominal pain, hypochondriac hardness, palpitations, difficult urination, no thirst, slight body heat, or cough, Xiaochaihu Tang is indicated.

For Shanghan or wind-stroke with Chaihu syndrome, observing one symptom suffices; all need not be present. If chest vexation without vomiting, remove Banxia and Renshen, add Gualou Shi (Trichosanthes Fruit). If thirsty, add Renshen and Gualou Gen (Trichosanthes Root), remove Banxia.

This section lists Shaoyang meridian symptoms, primarily treated with Xiaochaihu Tang. Vomiting warrants Banxia; absence of vomiting requires removing Banxia and Renshen, adding Gualou Shi. Thirst requires removing Banxia, adding Renshen and Tianhuafen.

In Shanghan after four to five days, with body heat, aversion to wind, head and neck pain, hypochondriac fullness, warm hands and feet, and thirst, Xiaochaihu Tang is indicated.

This clarifies that observing one Shaoyang symptom warrants Xiaochaihu Tang. Taiyang chapter mentions aversion to cold and headache for Taiyang treatment. Shaoyang chapter states observing one Chaihu symptom indicates Shaoyang, illustrating the mutual interpretation of symptoms and treatments across chapters.

In Shaoyin disease, with diarrhea for six to seven days, cough, vomiting, thirst, vexation, and insomnia, Zhuling Tang is indicated.

This clarifies Shaoyin diarrhea has cold and heat pathways. Cough, vomiting, thirst, vexation, and insomnia indicate Shaoyin heat diarrhea. Zhuling Tang is used to drain heat downward.

In Shaoyin disease, within two to three days, if dry mouth and throat occur, urgent purgation is required using Da Chengqi Tang (Major Purge the Gangrene Decoction).

This clarifies Shaoyin interior heat: dry mouth, throat, and thirst lead to immediate fluid exhaustion, necessitating urgent purgation with Da Chengqi Tang.

In Shaoyin disease, spontaneous passage of clear watery stool, purely green in color, epigastric pain, and dry mouth/throat require urgent purgation with Da Chengqi Tang.

This explains that urgent purgation requires specific signs: clear liquid without residue, pure green color without yellow/red mixing, indicating extreme heat mimicking Yin. Epigastric hardness/pain and dry mouth/thirst confirm interior excess requiring purgation.

Wuling San - see "Difficult Urination".

Gegen Tang - see "Malaria-like Symptoms".

Baihu Tang
Zhimu, Shigao, Jingmi (Rice), Gancao (Licorice Root)

For Yangming exterior heat thirst, use Gegen Tang. For resolved exterior and interior Yangming heat, use Baihu Tang. If difficult urination exists, add Huashi (Talcum), Mutong (Akebia Stem), Cheqianzi (Plantago Seed); for weak patients, add Renshen.

Zhuling San - see "Difficult Urination".

For Yangming water-fluid misdistribution causing thirst and diarrhea, this formula separates and drains urination.

Chengqi Tang - see "Constipation".

If evil heat transmits to Yangming interior, causing thirst and water metabolism; if transmitting to Shaoyin, causing dry mouth/throat and thirst, leading to thirst and constipation. Use this decoction if purgation indications exist.

Xiaochaihu Tang - see "Chills/Fever and Dizziness".

Excessive wind causes wasting; Wood steals Water. Thus, malaria from Shaoyang wind with extreme wasting-thirst is treated with Xiaochaihu Tang removing Banxia and adding Tianhuafen, a standard method.

Daochi Geban Tang

Fire stirring internally causes wasting-thirst. All fires originate from the Heart; Heart and Small Intestine are exterior-interior pairs. Treating Heart fire best involves promoting urination. This formula combines Daochi San with Xiexin Tang, specifically promoting urination.

Sanhuang Jusheng Tang
Huangqin (Scutellaria Root), Huanglian (Coptis Rhizome), Dahuang (Rhubarb Root), Shigao

For internal accumulated heat, body heat, excessive sweating, red/closed urination/defecation, red eyes, scorched lips, delirium, and thirst, use this formula.

Liangge San - see "Mania".

Heat in Lung and Stomach often causes thirst. Although this formula uses Dahuang, it excludes Zhike (Aurantii Fructus) and uses Jiegeng (Platycodon Root), cooling the upper jiao without descending.

Gegen Shigao Tang - see "Chills/Fever".

For Yangming interior heat thirst, use Baihu Tang; for Yangming exterior-interior heat, use this formula.

Shigao Qingzao Tang - see "Wheezing/Reversal Qi".

Heat in the qi level causes frequent thirst; dry-heat disease causes frequent thirst. Qingzao Tang acts on the qi level; clearing qi-level dry-heat stops thirst.

Dahuang Huanglian Xiexin Tang
Dahuang, Huanglian, Gancao

Thirst is always related to internal heat; draining Heart fire reduces heat and stops thirst.

Zhishi Zhizi Chi Tang - see "Agitation".

Food stagnation in the middle jiao usually does not cause thirst. However, long-term fermentation can cause thirst. Thus, instead of clearing heat to stop thirst, resolving grain stagnation stops thirst naturally.

Yinchen Hao Tang
Yinchen (Artemisia Capillaris), Zhizi, Dahuang

Jaundice with thirst depends on damp-heat rising. To clear heat and stop thirst, this formula is appropriate.

Shengma Qingwei Tang

For the same Yangming syndrome: if thirst involves water metabolism, heat is in the qi level, treated with Gegen Qingwei Tang. If thirst does not involve water metabolism, heat is in the blood level, treated with Shengma Qingwei Tang. Also used for rich diet accumulated heat, as meat/fat damages the blood level. Misusing cloying foods for Yangming evil heat thirst causes heat stagnation, phlegm-fluid accumulation, steaming heat, and worsened thirst. Conversely, three-yin diarrhea with cold-hydrate syndromes may present with false thirst, distinguished by lack of water metabolism and clear/white urine.