Fever Barely Above Normal, but Drowsy All Day with Cracked Lips? Doctor Zhang Xichun’s Case of Febrile Disease at the Shaoyin Stage

Search terms a patient might use: low fever that won’t go away / sleepy and drowsy all day / always wanting to sleep / dry cracked lips / mild sore throat / no bowel movement for four days

Medical terms for this pattern: febrile (warm) disease · Shaoyin-stage pattern · latent pathogenic qi · yin deficiency (treated with the Shigao Dihuang Tuoxie Formula — gypsum and rehmannia to draw the pathogen out)

Opening: we’re not finished with external-contraction diseases

Doctor Luo Dalun opens with a smile: today there’s no way around it — we have to talk about external-contraction (winter-cold style) diseases again. He has been lecturing on them a lot lately, and the readership and listenership have dipped a little — people are somewhat tired of the topic. But he thought it over and decided to continue anyway.

💬 Note from Doctor Luo: Quite a few followers have been listening for several years now and they all say, “It’s fine, just teach normally.” That shows this is not a short-term matter. If a new epidemic ever comes, people will discover that the Chinese medical theory of external-contraction diseases is still needed. And even for the ordinary cold — if you can truly understand the principles behind a cold, that alone is already an achievement.

Today’s case is the Shaoyin-stage pattern of a febrile (warm) disease from Doctor Zhang Xichun’s case records — a young man’s external illness that looked mild but was in fact extremely dangerous.

Who was the patient? A 25-year-old cousin

The patient was no stranger: Doctor Zhang Xichun’s younger cousin, Liu Shuangyuan, 25 years old, a farmer who worked the land.

💬 Note from Doctor Luo: External-contraction illness in young people must be taken seriously! Everyone assumes a strong young man should be fine. But that’s not how it works — some young people actually exhaust their kidney essence faster. Why? Young people run hot: sex, overwork, staying up late — they burn through their kidney essence, and while they look sturdy on the outside, the inside is hollow. So a young person’s external illness deserves extra caution.

The two lived more than forty li apart, so at first the cousin did not come to Doctor Zhang for treatment.

How did the illness begin? Always seeking shade, then catching a chill

From the first and second lunar months, the cousin had felt heat in his chest all the time.

💬 Note from Doctor Luo: Always feeling hot inside — what is that? Very likely yin deficiency — “yin deficiency generates internal heat,” as the Huang Di Nei Jing (Yellow Emperor’s Inner Canon) puts it. When the body’s yin is deficient, you feel heat inside.

Indeed, he had no appetite — he didn’t want to eat; and here’s the strange part: he kept going to the shady, cool places of the house. Why? Because there was heat in his body. Yin-deficient people often do exactly this: they like cold drinks and gravitate toward cool spots.

The result? Because he kept seeking the shade, he was lightly exposed to external cold — caught a bit of pathogen. In spring, that became a febrile (warm) disease — what Doctor Luo Dalun often casually calls “wen bing” (温病, warm disease).

How sick was he? Eight days of treatment made it worse

At the onset, the family called in a local doctor. After seven or eight days, the condition had not improved — it had grown steadily worse. By the time Doctor Zhang Xichun arrived, the patient looked like this:

• Clouded consciousness — a serious mental symptom, drifting toward unconsciousness;
• Eyes closed, curled up in bed — eyes shut, curled up like someone half-asleep, neither fully awake nor fully asleep;
• Hardly speaking — no desire to talk.

💬 Note from Doctor Luo: This “half-asleep” state has a technical name in Chinese medicine: dan yu mei (但欲寐) — lying there always wanting to sleep, never able to wake fully. It is actually a sign of severely depleted spirit. In the Shang Han Lun (Treatise on Cold Damage), it is a classic hallmark of the Shaoyin stage.

Now the details: a mildly sore throat, not badly painful; dry, cracked lips; the tongue so dry it shrank back — the tongue body contracted and could no longer stretch out, a sign of a critical condition. The tongue coating was thin, and the yellow coating was just about to turn black — it had already begun darkening. He drank water constantly, always thirsty, yet it never moistened him — the lips stayed cracked. He barely ate, just a little rice porridge a day.

He said his chest felt hot, a dry heat; his whole body ached and felt weak. When you touched his skin, it was not especially hot — his temperature was 37.8°C, nothing alarming.

💬 Note from Doctor Luo: Look at this: the temperature is not high, but the symptoms are serious — the tongue coating nearly black, the tongue dried and contracted, the man half-asleep. This is the classic case of “the symptoms are scarier than the fever.” Now the pulse: all six positions were faint and deep, requiring heavy pressure to feel, especially thin on the left side — though fortunately the rate was still normal. No bowel movement for four days; urine scanty, dark in color, and painful to pass.

Doctor Zhang Xichun laid out all the symptoms and then turned to his audience: so what disease is this?

The diagnostic highlight: a latent pathogen triggered by external cold, slipping into Shaoyin

Doctor Zhang’s judgment: this was latent pathogenic qi (fu qi) stirred up by an external contraction, producing a febrile disease — the body harbored a hidden pathogen, and a light external contraction triggered it into full-blown warm disease. Why did the illness go so deep? Because the kidneys were deficient — kidney qi was insufficient, and the pathogen went straight into the Shaoyin layer.

💬 Note from Doctor Luo: Shaoyin is the kidney channel. In Zhang Zhongjing’s six-layer model of external disease, Shaoyin is the innermost line of defense. What is special about this layer? The most fundamental source qi of the body is insufficient — the qi in the kidneys is deficient, so the body wants to resist but cannot muster the strength. When disease reaches Shaoyin, what state is the person in? Lying down, not wanting to talk, always wanting to sleep — that is “dan yu mei.”

Here we must distinguish two Shaoyin patterns, one cold and one hot:

• The cold Shaoyin pattern of cold damage (shang han): a person with insufficient kidney yang catches external cold; the taiyang channel rises to fight while the cold simultaneously strikes directly into Shaoyin — taiyang and Shaoyin both affected, called tai-shao liang gan (both layers affected), treated with Ma Huang Fu Zi Xi Xin Tang (Ephedra, Aconite and Asarum Decoction); if the pathogen enters Shaoyin completely and yang is nearly exhausted, use Si Ni Tang (Frigid Extremities Decoction) to blast yang back to life — the core strategy is warming yang.
• The hot Shaoyin pattern of warm disease — that is today’s patient. Kidney yin is insufficient, heat hides in Shaoyin, and it erupts in spring — the core strategy is nourishing yin and drawing the pathogen outward.

Two lines from the Inner Canon: injured by cold in winter; failing to store essence in winter

Where does warm disease come from? Doctor Luo Dalun brings out two classic passages from the Huang Di Nei Jing.

First line: “If you are injured by cold in winter, you will surely suffer warm disease in spring.”

💬 Note from Doctor Luo: In winter, cold pathogen injures you. Some people do not get sick right away — because the body’s resistance did not mount a violent reaction, or the body was weak, and so on — the pathogen hides inside the body. This is called latent pathogenic qi (fu xie). It hides in the membranous network of the Triple Burner (san jiao zhi mo), not causing disease immediately, coexisting with the body. But it has a flaw: it can obstruct the body’s normal functioning. So people carrying latent pathogen always feel a little off — for example, some say, “I always feel like I’m getting a cold, but I never actually catch one; my throat is never quite right; I wake up with some phlegm but can’t explain it.” Many people have this experience — that is latent pathogen in the body.

Does latent pathogen really exist? Doctor Luo says: it absolutely does — people really do harbor hidden pathogens. The simplest example: hepatitis B carriers — is the virus in the body? Yes. Is it causing disease? Not yet. That is latent pathogen. HIV carriers also go a long time without developing illness — again, carrying the pathogen. And shingles (herpes zoster): most people have been infected with that virus; it hides at the base of the spinal nerve roots and stays quiet, then flares along the intercostal nerves when your upright qi drops and resistance weakens — a string of blisters appears. That is not a fresh infection; it likely lay hidden for a year or two.

💬 Note from Doctor Luo: Hearing this, you should admire our ancestors — they thought deeply about how external pathogens invade the body. When spring arrives, temperatures rise, qi and blood flow faster, the body’s activity recovers, and upright qi begins to fight the hidden pathogen. That struggle releases energy and heat symptoms appear — that is one type of warm disease described in antiquity. In this type, yin-deficient people react more fiercely: spring naturally tends to produce deficient heat, and that plus the heat of the struggle can throw the person into high fever in no time.

Second line: “If you do not store your essence in winter, you will surely suffer warm disease in spring.”

💬 Note from Doctor Luo: If you failed to seal and store your essence in winter, letting it drain out too much, then anyone with even a slightly yin-deficient constitution will immediately damage yin. When yin essence is injured, the body runs hot — deficient heat blazes internally; by spring the deficient heat is even stronger and yin essence even scarcer — the fluids that should moisten and still the body are running out. Outside the weather is hot, inside there is deficient heat — and at that moment external pathogens find it especially easy to invade. Why? Picture the channels as ditches: when the little streams have water, the boats carrying the defense troops can sail. Now the water has evaporated dry — heat outside, heat inside, sweating — the ditches are dry, the boats cannot sail, the defense troops cannot reach their posts, and the external pathogen marches straight in.

And — do these two types overlap? Of course they do. Never be mechanical when studying Chinese medicine: a person can be both yin-deficient and essence-insufficient, catch cold in winter, carry latent pathogen, and finally fall ill — you must put the two pictures together.

The insight of Liu Baoyi: pathogens love to hide in Shaoyin

An ordinary warm disease does not usually strike straight down to the innermost Shaoyin kidney channel. Why did this patient’s illness settle in Shaoyin? It must be kidney qi exhaustion. If kidney yang is insufficient, the body enters a cold configuration and ends up as the cold Shaoyin pattern; if kidney yin is insufficient, the pathogen lurks in the Shaoyin kidney channel.

💬 Note from Doctor Luo: In the Qing dynasty there was a warm-disease specialist named Liu Baoyi, whose Liu’s Selection of Four Physicians’ Case Records (《柳选四家医案》) paid great attention to latent pathogens. He believed external pathogens especially like to hide in the Shaoyin kidney channel — because that is the most secluded spot, the deepest location in the body. The pathogen is like a thief: it always hides in the quietest, most hidden place. In spring yang qi stirs and the body becomes active — but the yin-deficient person cannot cope: without moistening substances, internal heat surges up, the hidden pathogen can no longer stay concealed, the body detects it and starts fighting, and heat rises. Yet kidney qi is still insufficient, so the battle is not violent — hence the temperature stays low, around 37-something. This is the hot Shaoyin pattern — that is, warm disease.

So why did this patient have a sore throat? Because the Shaoyin channel ascends to the throat, and the pathogenic heat followed the channel up to it. Why cracked lips and a dry, contracted tongue? The true yin of the kidneys was insufficient and the heat too strong — kidney essence could not rise to moisten the upper body. Why dry stools and dark urine? All signs of yin deficiency and essence insufficiency. Why the clouded mind, eyes closed, curled up, unwilling to speak? Kidney yin and heart yang could no longer support each other — water and fire could not meet; heart function was affected. In the end, upright qi was insufficient.

Breaking down the prescription: raw gypsum as the foundation, nourishing yin to draw the pathogen out

How to treat it? Doctor Zhang Xichun’s first formula:

Sheng shi gao (raw gypsum), 3 liang (about 90 g), ground fine, leads the formula — this is Doctor Zhang’s signature move.

💬 Note from Doctor Luo: Raw gypsum disperses heat. Doctor Zhang used raw gypsum extremely widely — with febrile disease he basically always built on it. He held that the excess heat of warm disease “cannot be resolved without raw gypsum” — without it, you may not be able to clear the heat. And he used it “to control complexity with simplicity”: one herb doing the work of many.

Next, Ye Tai Shen (wild Taihang Codonopsis), 4 qian (about 12 g) — one variety of dangshen (Codonopsis) — to support upright qi. Doctor Zhang’s rule: whenever upright qi is insufficient, raw gypsum must be paired with Codonopsis — the White Tiger plus Ginseng Decoction (Bai Hu Jia Ren Shen Tang) strategy; supporting upright qi helps clear pathogenic heat. Sheng huai di huang (raw rehmannia), 1 liang (30 g), nourishes yin and clears heat — a key herb here. In treating the Shaoyin pattern of warm disease, Liu Baoyi advocated nourishing yin to draw the pathogen outward: the cold-damage Shaoyin pattern is handled by warming kidney yang to push the pathogen out, but the warm-disease Shaoyin pattern cannot use warming herbs — it must use yin-nourishing ones, and raw rehmannia is the main vehicle for drawing the pathogen out. Sheng huai shan yao (Chinese yam), 8 qian (24 g), alongside the rehmannia, supports upright qi and strengthens spleen-stomach qi. Xuan Shen (figwort root) clears heat, and Liao Sha Shen (Adenophora root) nourishes yin — both assist the rehmannia in drawing the pathogen out. Gan cao (licorice), 3 qian (9 g), resolves toxins and harmonizes the middle.

And one special herb — fresh Bai Mao Gen (cogongrass rhizome), 5 qian (15 g).

💬 Note from Doctor Luo: Doctor Zhang urged people to go dig fresh cogongrass root themselves — the grass is everywhere. If fresh root is unavailable, take dried Bai Mao Gen from the pharmacy, 1.5 liang (45 g), boil it in water — just bring it to a rolling boil a few times — then cover it, take it off the fire, and let it settle to the bottom; use that water to decoct the rest of the formula. The effect is the same as fresh root. Fresh Bai Mao Gen carries the earliest rising qi of spring — it is one of the first plants to sprout. Its stem is hollow, cool yet dispersing; used as a guide, it can draw deep-hidden heat out of the kidney channel and drain it through the urine. So people with painful, scanty urination benefit especially from Bai Mao Gen.

When the decoction was ready, a raw egg yolk was stirred in before drinking.

A twist in treatment: the fever going UP was good news

What happened after taking the medicine? After three doses, the body temperature rose, the pulse gained strength — fuller and more surging (hong hua) than before.

Was the rising temperature good or bad? Doctor Luo says: it was good news!

💬 Note from Doctor Luo: The heat was being pushed out to the surface! With warm disease at the Shaoyin stage, the method is to draw the pathogen out layer by layer — sometimes the fever rises high, then gradually falls; take more medicine, and it comes out again. That is heat emerging from the interior — a good thing. But there is a problem in modern practice: patients are too delicate. They know they have a febrile illness, take the medicine, the temperature rises — and they immediately get impatient, even refuse to continue. That’s why being a TCM doctor today is hard: some practitioners won’t take responsibility, and say, “Stop the medicine and go see another doctor.” In fact, if the patient truly trusts the doctor, the doctor can explain: keep taking it — the heat coming out is a good sign. In this case, the temperature rose, meaning the body had started to fight back and the pathogen was surfacing. Truly good news!

And the other symptoms? His spirits lifted, and the various complaints gradually eased — his mind cleared. He only still felt a little residual heat in his chest, and the bowels had not moved yet.

Doctor Zhang said: treat with a large dose of cool, moistening herbs, plus a little qi-supplementing support. The second formula: sheng shi gao (raw gypsum, ground fine), 1 liang (30 g), to continue dispersing heat; Ye Tai Shen, 3 qian (9 g), to support upright qi; sheng huai di huang, 1 liang (30 g), to nourish yin, clear heat, and clean the latent heat from the Shaoyin kidney channel; Xuan Shen and Sha Shen, paired with the rehmannia to draw the pathogen outward; and newly added large sweet gou qi zi (wolfberry) — to support kidney qi and nourish the essence of liver and kidneys; gan cao, 2 qian (6 g); fresh Bai Mao Gen, 4 qian (12 g). The preparation was careful: first decoct the front seven ingredients for about ten boils, then add the Bai Mao Gen and decoct for seven or eight more boils — that is the fresh-root method; dried Bai Mao Gen is not used this way. Strain the clear decoction into two large cups, take warm, one cup at a time, stirring a raw egg yolk into each dose.

💬 Note from Doctor Luo: Why keep adding egg yolk? Remember: Doctor Zhang held that after a febrile illness, the things that can replenish fluids, nourish yin, clear heat, and push the pathogen outward are just these few — sheng di huang (raw rehmannia), Huai shan yao (Chinese yam), Xuan Shen (figwort root), Sha Shen (Adenophora root), Mai Dong (Ophiopogon) — plus ji zi huang (raw egg yolk). Roughly that list. So the egg yolk is not an afterthought — it is a standing member of Doctor Zhang’s method of drawing the pathogen out.

And the result? After two more doses, the bowels moved, and the illness was completely cured.

The narrator’s closing note: cold and heat — read the body’s overall configuration

Doctor Luo Dalun says Doctor Zhang chose this case particularly well — it explains precisely: what happens when an external illness lands on someone in the Shaoyin stage. That is, when a person’s upright qi is extremely insufficient and kidney qi very weak, catching an external illness can take one of two forms — cold damage or warm disease.

💬 Note from Doctor Luo: Let’s analyze the factors: with kidney qi insufficiency in both cases, first ask whether your kidney yang or kidney yin is deficient — that is one set of factors, your own; then look at the external weather’s coldness or warmth — the cold of winter, the warmth of spring and summer, different environments; and then there is the state of qi and blood flow and qi movement during seasonal transitions. All these factors together put the body into different configurations: the cold-damage Shaoyin pattern, or the warm-disease Shaoyin pattern. See how carefully Chinese medicine thinks when a person catches a cold! Treatment includes warming yang and dispersing cold, or nourishing yin and clearing heat. It is not “bacteria arrive, use antibiotics; a virus arrives and if there is no antiviral, nothing can be done” — even with a virus, Chinese medicine still sorts people into types, sorts environments into types, analyzes the body’s configuration, and adjusts with various methods. Weren’t the ancients clever?

Bonus story: Chinese medicine going global

Doctor Luo Dalun closes with words from the heart — starting from the recent pandemic.

💬 Note from Doctor Luo: In the first half of this pandemic, China was the one fighting: combining Chinese and Western medicine — Western medicine handled isolation and supportive care (such as replenishing fluids), Chinese medicine handled treatment — and together they brought the outbreak under control quickly. But at home there were still plenty of “TCM-bashers” insisting Chinese medicine is unscientific; under every TCM doctor’s social media post there was a crowd of them shouting. Yet our treatment results were excellent! In the second half of the pandemic, the fight moved overseas — and the whole world beyond China was fighting without any Chinese medical knowledge to lean on. That was a real pity. And then I noticed something: the TCM-bashers suddenly went quiet, because the situation abroad really was worrying. As Chinese people, we can be proud — our ancestors left us great wisdom, and that wisdom helped us a great deal. We must inherit it well. At the same time, we are all human beings, and we should have compassion for humanity; I hope that in the future Chinese medicine will go overseas and help more people there. I believe this is surely the trend — the students of Chinese medicine of the future need to work hard.

Arranged from Doctor Luo Dalun’s lecture on Doctor Zhang Xichun’s cases; the case is from the Records of Chinese Medicine with Western Reference (《医学衷中参西录》).

What to take away

1. Fever is not the whole story. A body temperature of 37.8°C may look mild, but a tongue coating turning black, a tongue shrinking from dryness, and a person half-asleep are far more serious than the thermometer suggests.
2. “Always wanting to sleep” (dan yu mei) points to the Shaoyin layer — the innermost defense line. When kidney qi is exhausted, the body cannot mount a strong fight, so the fever stays low even as the disease runs deep.
3. Two Shaoyin patterns, opposite treatments. Kidney yang deficiency with cold → warm yang with formulas like Ma Huang Fu Zi Xi Xin Tang or Si Ni Tang. Kidney yin deficiency with hidden heat (this case) → nourish yin and draw the pathogen outward with rehmannia, yam, figwort root, Adenophora root, Ophiopogon, and raw egg yolk, built on a base of raw gypsum.
4. Heat surfacing is progress. When the fever rises after treatment begins, it may mean the pathogen is being pushed out — not that the medicine failed.
5. Watch your winter habits. “Injured by cold in winter, sick with warm disease in spring” and “failed to store essence in winter, sick with warm disease in spring” — overwork, late nights, and excessive exertion drain kidney essence, and a body with empty essence is easy prey for pathogens.