Red Tongue, Dry Mouth and No Saliva? Doctor Wang Mengying Saves a Man Whose Yin Deficiency Was Mistreated with Warming Herbs

Patient search terms: red tongue / why is my tongue red / dry mouth with no saliva / dry mouth / sweating that will not stop / clouded consciousness / seminal emission Medical terms: yin deficiency with internal heat · chronically depleted yin · warm disease mistreated with warming herbs (real heat and yin deficiency often go together)

The opening: on the way to a new post, one dose of medicine nearly killed a man

During the Daoguang reign of the Qing dynasty, a prefect was traveling to Yunnan to take up his post, bringing his elderly father along. As they passed through Hangzhou, one of the family members fell ill — and when a local doctor gave him a single dose of medicine, the man nearly died: sweat poured out of him, his mind clouded over, he grew agitated and raved nonsense, and even his seminal fluid leaked away — as if his upright qi were about to scatter completely. In the end, it was the great Qing-dynasty master of warm diseases, Doctor Wang Mengying, who saved him.

💬 Note from Doctor Luo: Doctor Wang Mengying ranks among the very top physicians of the Qing dynasty — a master of warm-disease theory with superb technique, and he left behind an enormous number of case records. When I was studying Chinese medicine, the very first casebook I ever read was the Wang Shi Yi An — and Volume 1 was compiled for him by Zhou Guangyuan. From these cases, you can see an enormous amount of the craft.

Who was the patient? The brother-in-law traveling with his sister’s husband to take up office

The patient was called Zheng Jiu — the younger brother of the favorite concubine of the honored elder Zhang Liuyin. What does “feng weng” (honored elder) mean? It means his son had done so well as an official that the emperor, in turn, conferred a title upon the old father — the same principle as a mother receiving the title of “ming fu” (lady of honor) because of her son’s achievements.

💬 Note from Doctor Luo: Zhang Liuyin’s son, Zhang Hengzhai, was a prefect, and that summer (the yi-wei year) he was traveling south to Diannan — the southern part of Yunnan — to take up office. This prefect was a filial son, and he brought his old father along with him. They passed through Wulin — present-day Hangzhou — and no sooner had they arrived than this Zheng Jiu fell ill.

Where it went wrong: one “warming” formula, and out came the sweating, the delirium, the seminal emission

Zheng Jiu fell sick the moment he reached Hangzhou. The honored elder Zhang Liuyin was alarmed and immediately called in a local physician, Chen Liushun.

💬 Note from Doctor Luo: Remember this Chen Liushun — he appears again in later cases, and Doctor Wang Mengying rather disliked him, because he was not a good doctor. As for Zheng Jiu’s illness, the original record does not say exactly what the symptoms were — but there must have been sensations of chills and fever, something like an external invasion, and it may have looked a bit like yang deficiency. Chen Liushun took one look and prescribed warming, yang-tonifying herbs — rou gui (cinnamon bark), fu zi (aconite root) and the like.

And after taking the medicine? The symptoms turned violent: sweating with clouded consciousness — the sweat poured out, the head swam, he grew agitated and raved, his mind went wrong; and the seminal fluid seemed about to leak away — the essence drained out, and the whole man seemed on the verge of collapse, as if he might pass at any moment.

Doctor Wang steps in: the pulse beat like a disordered drum, but he only said “he can be saved”

The honored elder was terrified. He hurriedly asked around Hangzhou: who else is good at treating illness? People said: Wang Mengying is the one. So the old gentleman went in person to Doctor Wang’s door and begged him to come as an emergency.

Doctor Wang took the pulse: rapid and chaotic — fast, but with an irregular rhythm; and extremely threadlike when pressed deep — press down, and the pulse was thin beyond measure.

💬 Note from Doctor Luo: A fast pulse is not the problem — as long as the rhythm holds. It is the chaos that signals real trouble — when the rhythm itself is disordered. Whenever the pulse becomes chaotic, physicians of old all considered the disease very hard to treat. After finishing the examination, Doctor Wang said to the honored elder: this case is quite dangerous, but there is still a thread of vitality left — he can be saved.

And he named the root of the disease: this Zheng Jiu was chronically depleted in yin — his yin had been wasted too severely in ordinary life, so that the slightest mistake in medication, the slightest warming touch, and his body could not bear it — trouble erupted at once.

The high point: he did not blame the previous doctor — and gained a lifelong friend

What is even rarer is Doctor Wang’s attitude — he did not heap abuse on the physician who had prescribed wrongly.

💬 Note from Doctor Luo: He said the previous doctor’s cinnamon and aconite could not be entirely blamed — because this man’s yin was deficient to the extreme; when deficiency reaches that depth, even a little warming medicine is more than the body can bear. This is what he meant by “we cannot lay the whole fault at the previous doctor’s door.” Anyone who has studied the Dao De Jing knows that “zi fa” means self-aggrandizement — Doctor Wang did not boast “only I could save him” just because the case was so dire; he only said “he can be saved, but the vitality hangs by a single thread.” That kind of restraint marks a true elder in the art.

The honored elder was delighted. The two men found each other’s company so agreeable that they struck up a friendship that crossed the generations — an old gentleman and a famous physician, from that day bosom friends, pouring out their life stories to each other.

💬 Note from Doctor Luo: Only during this exchange did it come out that Zhang Liuyin was a devoted student of Chinese medicine — he loved to talk medicine more than anything; he had read the Huang Di Nei Jing (Yellow Emperor’s Classic of Internal Medicine) and every one of the medical classics, and his knowledge was very rich. But he refused to treat patients himself — why? Out of caution: a human life hangs in the balance. I laughed when I read this: over there the patient is sweating, delirious, nearly gone — and here the two old gentlemen are pouring out their life stories. The literary exaggeration aside, what it really means is “what a fine fellow you are — now please, quickly, look at the patient!” Jokes aside, the prescription had to be written at once.

Dissecting the prescription: clearing real heat, nourishing yin, and restraining — three lines of attack at once

Doctor Wang’s formula: xuan shen (figwort root), zhi mu (Anemarrhena), huang bai (Phellodendron bark), sang zhi (mulberry twig), calcined mu li (oyster shell), sheng di (raw Rehmannia), bai shao (white peony), gan cao (licorice), bai he (lily bulb), shi hu (Dendrobium), zhi zi (Gardenia fruit), and dan dou chi (fermented soybeans, salt-water fried). One large dose was poured down — one dose swallowed, and he was settled — the crisis basically stabilized.

💬 Note from Doctor Luo: How do we read this formula? Doctor Wang’s core strategy can be summed up in six characters: clear heat, nourish yin, transform phlegm. Look at his opening trio — xuan shen leads the charge as the sovereign herb: it nourishes body fluids, resolves toxins, and cools the blood; it draws fluids upward to moisten the upper burner, which is why whenever the throat is involved, xuan shen is often added (it appears in the Jie Geng Xuan Shen Tang). Zhi mu clears lung heat; huang bai clears the heat of the kidney channel in the lower burner — these two are the same pairing as in the zhi bai di huang wan (Anemarrhena-Phellodendron-Rehmannia pill); and then zhi zi — all of these clear heat. And what are they clearing? Real heat — this man genuinely had heat inside his body.

Then why pair them with yin-nourishing herbs? Because real heat and yin deficiency usually appear together: when the body fluids are insufficient, external pathogens enter easily and real heat breeds within; and in turn, real heat consumes the fluids and deepens the yin deficiency.

💬 Note from Doctor Luo: Please do not split these two things into an either/or — as if it must be either damp-heat or yin deficiency. In reality they often coexist and feed each other. So look at the structure of this formula: sheng di cools the blood and nourishes yin; bai shao plus gan cao — sour and sweet together generating yin, producing fluids; shi hu nourishes the fluids — this is the yin-nourishing line. Sang zhi (mulberry twig) dispels dampness and frees the channels — which tells us the patient probably had some twitching of the sinews; it simply was not written down. Long gu and mu li restrain and settle the spirit — the man’s consciousness was already clouded; bai he moistens the lungs and also calms the spirit; and dan dou chi, fried in salt water is the most exquisite touch — fermented soybeans are ordinarily a diaphoretic, but once fried in salt water they do the opposite: they gather the sweat in. Clear heat and nourish yin as the foundation, with a little astringency added — one dose, and the man was stable.

The turn: adding tortoise plastron and turtle shell — cured in eleven days

The next day, Doctor Wang removed zhi zi, dan dou chi and gan cao, and added gui ban (tortoise plastron), bie jia (turtle shell), and salt-water fried ju hong (red tangerine peel).

💬 Note from Doctor Luo: Gui ban was added to strengthen the action of nourishing yin and subduing yang; bie jia ferrets out residual heat — it too nourishes yin and subdues yang; ju hong fried in salt water regulates the qi and strengthens the spleen and stomach’s transforming function. With these, he took another ten-plus doses, and the illness was cured in eleven days.

The key question: why does a single warming herb almost kill someone with yin deficiency?

The illness was cured — but you may ask: why was this case so severe? One small mistake in medication, and the patient nearly died? What exactly did Doctor Wang rely on to save him?

💬 Note from Doctor Luo: From my own experience (this is Doctor Luo speaking), there are truly many such people — those who do not cherish their own bodies in daily life, so that the upright qi is gradually damaged. For example: people given to lust and excess — their yin is wasted severely. Once you have seen many patients, you know that some people are gravely depleted in kidney essence, deficient in kidney yin — to the point where there is not a drop of saliva in the mouth. When the kidney essence cannot rise to nourish the upper body, the mouth goes dry; when the fluids are insufficient, even the sexual desire vanishes entirely. The liver yin, kidney yin, lung yin and heart yin all become insufficient — the heart races and throws premature beats — and such people must be regulated slowly with yin-nourishing, pulse-restoring formulas (the zhi gan cao tang, Roasted Licorice Decoction, family of prescriptions).

When such a person meets hot, muggy, sauna-like weather, and catches an external invasion, the pathogen turns to heat with terrifying speed, and the illness becomes very severe — just like a COVID infection: a yin-deficient person can go critical at once. And if at that moment warming herbs are wrongly used, critical signs erupt immediately. That is why some of our physicians treating COVID go straight to heavy yin nourishment — lots of gou qi zi (goji berry), tian dong (asparagus root), mai dong (ophiopogon) — why? To correct the yin fluids at once, never reckless. I have seen such people: at night their mouths are dry as sandpaper; in the daytime, too, there is not a trace of fluid.

Health reminder: a red tongue and a dry, saliva-less mouth are the alarm

So how do you know in ordinary life whether you have this yin-deficient constitution? What do you look at?

💬 Note from Doctor Luo: The tongue must be red — not a tender, fresh red, but the old, deep red kind. To be honest, though, some people’s tongues are not that red — the coating covers it, or the qi and blood are so insufficient that the color cannot show; but a thin, rapid pulse (mai xi shu) is a certainty. So the tongue is only one piece of the assessment — don’t take it as absolute. The true alarm is this: the mouth is extremely dry, with no saliva at all — normally, move the tongue a little and saliva gradually gathers in the mouth; but if you can move it all day and nothing comes, and at night you wake up parched and have to drink water — that is a signal of severely depleted yin fluids, and you must replenish immediately.

For health preservation, a yin-deficient constitution calls for constant nourishing and restraint: moderate desire, stop consuming yourself; do not stay up late; do not brood and overthink; avoid spicy, hot-natured foods; do not bake in the strong sun — under a 40°C blazing sun, other people are fine, but a person whose yin is severely depleted can be harmed by a single exposure.

💬 Note from Doctor Luo: How do you nurture it day to day? Very simply: brew some gou qi zi (goji berry) water to drink, or drink suan mei tang (sour plum soup, wu mei tang), nourish yin with tian dong (asparagus root) and mai dong (ophiopogon), take liu wei di huang wan (Six-Ingredient Rehmannia Pill) or mai wei di huang wan (with Ophiopogon and Schisandra added), and use shu di (cooked Rehmannia) and sheng di (raw Rehmannia) — after all, Doctor Wang’s own formula here contains sheng di. Slowly build the yin fluids back up. Many people don’t understand and keep staying up late, eating hot foods, and wasting themselves in excess — the yin is down to its last drop, and one slightly wrong warming medicine brings a catastrophe. This is not because the ancients were fragile — modern people are exactly the same: when yin and yang are severely out of balance, a single dose of hot medicine knocks the equilibrium out, and disaster follows quickly.

This case looks simple, but the principle beneath it runs deep: when a person chronically depleted in yin catches an external illness and is wrongly given warming tonics, danger erupts on every side; Doctor Wang Mengying snatched back the single thread of vitality with heat-clearing and yin-nourishing — clearing heat and nourishing yin side by side, one dose deciding the outcome.

What to take away

• A red tongue and a dry mouth with no saliva are the alarm for yin deficiency. If your mouth stays parched no matter what, and you wake at night desperate for water, your body fluids are depleted — start nourishing yin instead of reaching for “cooling tea” for “fire.”
• Real heat and yin deficiency usually travel together. Don’t split them into either/or — heat consumes fluids, and depleted fluids invite heat.
• A person with severely deficient yin cannot tolerate warming herbs. One dose of cinnamon or aconite can tip them into crisis. This is why the wrongly-placed “warming tonic” is so dangerous for such constitutions.
• Doctor Wang’s strategy: clear the real heat, nourish the yin, add a touch of restraint. Figwort root and Anemarrhena to clear heat, Rehmannia, peony, licorice and Dendrobium to nourish fluids, dragon bone and oyster shell to settle the spirit, and salt-water fried fermented soybeans to gather the sweat.
• Daily care for yin deficiency: moderate desire, no staying up late, no hot-natured foods, no baking in the sun; goji berry water, sour plum soup, and the classic Six-Ingredient Rehmannia Pill family.

So — friends with a red tongue and a dry, saliva-less mouth: don’t just think “I have heat, I need cool tea.” Ask yourself first whether your yin fluids are running low — and nourish the yin.

Compiled from Doctor Luo Dalun’s commentary on Doctor Wang Mengying’s cases; the original case comes from the Wang Shi Yi An (The Medical Cases of the Wang Family), Volume 1, edited by Zhou Guangyuan.