He Caught a Cold in Winter and Didn’t Take It Seriously — a Year Later He Was Coughing with a Fever Every Afternoon. Doctor Zhang Xichun Treated His Latent Pathogenic Heat and Cured the Consumptive Cough in Under Ten Doses

Patient search terms: cough lighter by day and worse at night / fever at a set time every afternoon / body never sweats / hungry but no appetite / long-term cough with a body growing weaker Medical terms: consumptive cough (fei lao ke sou) · latent pathogenic heat (fu qi hua re) · yin deficiency with tidal fever · chronic cough with declining health (jiu ke xu lao)

Opening: a cold he “didn’t take seriously” became consumptive cough a year later

Today’s patient is a case Doctor Zhang Xichun saw in Shenyang. The patient’s surname was Gao — Gao Ruizhang, thirty-two years old, working as a household-registration clerk. The story begins on a winter night — he went door to door checking household registrations, and Shenyang’s winter runs to about minus twenty degrees Celsius, the cold wind cutting to the bone. But at the time he thought: it’s just a little cold, right? Didn’t take it seriously.

Nobody imagined that this cold he “didn’t take seriously” would, a year later, drag him into a consumptive illness — coughing, wheezing, his body weak and failing.

💬 Note from Doctor Luo: In Doctor Zhang Xichun’s case records he writes the patients’ real names — Gao Ruizhang, a household-registration clerk, in Shenyang. Today we try to leave real names out of case reports, because it touches on patient privacy and the people involved would be embarrassed. The very fact that Doctor Zhang Xichun names names is exactly why these cases are genuine and reliable — they were not made up.

Who was the patient, and how did the illness settle in step by step?

First, a word about the term “consumptive cough” (fei lao). The ancients’ understanding of it was rather vague — because the character for “consumption” written with the illness radical (痨, the lao of tuberculosis) and the character for “labor/toil” (劳) were often mixed together in the past. Both describe a person who is extremely weak and coughing without stop. In fact we should separate them: the one written with the illness radical is pulmonary tuberculosis; the other kind of consumptive cough is insufficient upright qi wounded by external pathogens, leading to long, repeated cycles of illness until the person ends up extremely weak, with lung disease and endless coughing — the case Doctor Zhang Xichun tells here is the second kind.

How did Gao Ruizhang’s illness begin? At the end of the twelfth lunar month, in the coldest days of Shenyang, he caught wind-cold while checking household registrations door to door. At the time he felt the chill, but his body seemed fine — it did not immediately become an illness — yet from that point on, he never sweated again.

💬 Note from Doctor Luo: Friends, not sweating is itself a symptom! Even today many people regularly do not sweat, for many reasons — some have blocked channels, some have insufficient upright qi, and so on. In any case, a body that does not sweat is a body with a problem.

Then his heart began to feel hot — heat in the heart, heat inside the body. By spring, the heat grew worse: his appetite flagged, he did not want to eat; then he began to cough, and gradually it became consumptive cough — the man grew weak, coughing endlessly.

How bad was it? A “strange” list of symptoms

What were the features of this cough? Lighter by day, worse at night — during the day it seemed a little better, at night heavier; sometimes he coughed, sometimes he wheezed between coughs — coughed until he was panting. This shows the cough was already severe: the upright qi was insufficient, the body frail.

Looking further down, the symptoms get more and more distinctive:

• Aching bones and sinews — the joints felt sore and painful;
• A clouded spirit — he was always drowsy and muddled;
• Hungry in the belly — he felt hungry, but the food in his mouth he did not want to swallow;
• His body always felt hot at ri bu (the late-afternoon hour) — in the afternoon, the body began to run hot;
• Dry stools, scanty dark urine;
• The pulse wiry and long on both sides, the right pulse forceful on deep pressure, five beats to one breath.

💬 Note from Doctor Luo: Notice the symptom of “hungry but no appetite” — many people have this; it is a sign of spleen-stomach dysfunction. Faced with such a complicated patient, how do we analyze it? Consumptive cough means a very weak body coughing without stop — especially common in elderly northerners, who cough in an unbroken chain. This kind of illness is very hard to regulate.

How did Doctor Zhang Xichun think it through? The key stroke of the whole case: “latent pathogenic heat” (fu qi hua re)

Doctor Zhang Xichun judged: this was cold contracted in winter, with the pathogen never cleared out properly. In Chinese medicine this kind of illness is called — latent pathogenic heat (fu qi hua re).

What does latent pathogenic heat mean? It means that when you were struck by a pathogen and never used a method to expel it, the pathogen entered the body and hid there — that is “fu qi,” the qi that lies in ambush. And where exactly does it hide? The ancient physicians disagreed: some said it hides in the Shaoyang channel, some said in the membranes of the Triple Burner (san jiao zhi mo), some said in the kidney channel.

💬 Note from Doctor Luo: Take some of our patients with chronic nephritis — many of them are exactly this kind of pathogen hiding in the kidney channel; many liver diseases — a person is infected with a virus, the external pathogen arrives but the illness does not break out immediately — that is the latent pathogen hiding in the liver channel, and when the time is ripe it flares up acutely; even some diseases, such as AIDS, are viruses lying hidden without symptoms until one day the body weakens, and it seizes the chance to erupt. The doctrine of the latent pathogen is a very distinctive theory in Chinese medicine. Some practitioners say there is no such thing as a latent pathogen, but the more patients you see and the more you ponder, the more you realize it does exist — some latent pathogens even hide in the mouth and nose, in the nasal passages and throat, and erupt when the time is ripe.

What does the Huang Di Nei Jing (Yellow Emperor’s Classic of Internal Medicine) say? “Injured by cold in winter, one is sure to suffer warm disease in spring” — wounded by the cold pathogen in winter, the hidden pathogen erupts in spring, and warm disease easily follows. The later doctrine of latent qi takes its theoretical basis precisely from this sentence of the Classic.

Doctor Zhang Xichun believed this patient’s pathogen hid in the half-exterior half-interior (Shaoyang) and the membranes of the Triple Burner — this is the ancients’ loose way of putting it; for us, it is enough to know that the pathogen was hiding inside the body.

After the latent pathogen hid itself: the body slowly “roasted” by heat

What happens after the pathogen hides itself? First, it obstructs the movement of qi and blood — the transformations, the rising and descending, the free flow are all blocked, which is why he did not sweat: the channels were blocked. Second, the organs are all affected — the stomach, receiving the heat, became lazy about food (he did not want to eat); the heart, receiving the heat, clouded his spirit (his energy was always short); the kidney, receiving the heat, produced yin deficiency with tidal fever; the liver, receiving the heat, ached his bones and sinews (the liver governs the sinews — the places where bones join are called sinews); the lung, receiving the heat, coughed and spat phlegm.

💬 Note from Doctor Luo: Let me take the chance to explain what tidal fever (chao re) is — fever that comes at a fixed time every day, with the rhythm of the tide. This man’s daily afternoon fever is exactly tidal fever. Tidal fever is usually connected with yin deficiency, which is why Doctor Zhang Xichun says “the kidney, receiving the heat, produces yin deficiency with tidal fever.”

Prescription, part one: raw gypsum leads the charge to clear and draw out the latent heat

Doctor Zhang Xichun concluded this was a pathogen never fully cleared, latent heat turned active, and the treatment strategy was clear: mainly clear the pathogen, with support to nourish the body’s fluids.

The formula itself was not complicated:

• Raw shi gao (gypsum), one liang (30 g, crushed) — clears and draws out the heat pathogen. This is a herb Doctor Zhang Xichun was especially skilled at using;
• Dang shen (codonopsis), three qian (9 g) — supports the upright qi;
• Tian hua fen (Trichosanthes root), eight qian — clears deficient heat and nourishes fluids;
• Xuan shen (figwort root), eight qian — nourishes yin and clears deficient heat;
• Bai shao (white peony), hua shi (talc) — the talc flushes the heat pathogen out through the urine; the white peony gathers the floating heat of the upper burner and also drains it out through the urine;
• Lian qiao (Forsythia), three qian (9 g) — clears heat, resolves toxins and draws out the pathogen;
• Fresh mao gen (Imperata root), three qian — draws out the stagnant heat from the organs and bowels;
• She gan (Belamcanda), three qian (9 g) — clears the throat, calms wheezing and stops cough;
• Yuan zhi (Polygala root), six grams — regulates the lung’s opening and closing;
• Gan cao (licorice) — harmonizes all the herbs.

💬 Note from Doctor Luo: Let me unpack a few of these herbs. Raw gypsum, crushed, one liang — the herb Doctor Zhang Xichun was especially good at using to clear and draw out heat. He said raw gypsum is not so cold, and one may use it boldly — by the time you have heard all his cases you will notice that the herbs he used heavily were just a few kinds, and the more you study the simpler it gets. What is tian hua fen? It is the root of the Trichosanthes vine (gua lou), sliced for use — hence the saying “it bears the name of powder but is no powder at all.” Raw gypsum clears excess heat (shi re); tian hua fen and xuan shen clear deficient heat (xu re) — that excess heat the yin deficiency makes visible in the body is retired by nourishing yin and replenishing fluids.

The most worth-remembering point here is: whenever Doctor Zhang Xichun used raw gypsum for a weak person, he always paired it with dang shen — merely driving out the pathogen and attacking the illness while never supporting the upright will not do. Where did this thinking come from? He drew it from Zhang Zhongjing’s Bai Hu Jia Ren Shen Tang (White Tiger plus Ginseng Decoction). Later generations of old doctors summed it up: to bring down a high fever in a weak person — especially an elderly person — raw gypsum without dang shen works very poorly, and an elderly patient’s condition is apt to change suddenly.

💬 Note from Doctor Luo: This is from my own experience — after I learned this lesson, whenever I regulate elderly patients with a stubborn high fever that needs to be drawn out, I always pair the gypsum with dang shen — this is important. As for Imperata root (mao gen), Doctor Zhang Xichun loved using it fresh, telling patients to dig it from the fields. Imperata root enters the lung, stomach and bladder channels; we usually say it cools the blood, stops bleeding, clears heat and promotes urination — but Doctor Zhang Xichun held that it is especially good at drawing out the stagnant heat of the organs and bowels — no matter which organ or bowel holds stagnant heat, it can draw it out and clear it. We will meet Doctor Zhang Xichun’s use of Imperata root again and again in later cases.

The use of yuan zhi here is unusual. Usually we use it to calm the spirit, benefit the mind, resolve phlegm and reduce swelling — more often when regulating emotions. But Doctor Zhang Xichun had his own insight: yuan zhi is pungent to disperse and sour to astringe — the pungent can disperse, the sour can hold — with both dispersing and astringing, he believed yuan zhi can regulate the rhythm of the lung’s opening and closing, letting the lung’s expansion and contraction gradually return to the natural. So whenever he treated cough and wheezing, he often added yuan zhi. That is Doctor Zhang Xichun’s special experience.

Four doses, and two-thirds of the heat was gone: the illness came from cold — why all heat-clearing herbs?

How did the formula work? The patient took four doses (four days), and two-thirds of the heat withdrew — most of the fever was gone; the cough and sputum were mostly better; his appetite began to recover, his stomach slowly opened; and the pulse calmed down. On this basis Doctor Zhang Xichun judged: the latent heat was dispelled.

💬 Note from Doctor Luo: Some friends will ask: didn’t you say this illness came from cold? Why did you prescribe all heat-clearing herbs? Here is the thing — at the very beginning there was cold; the cold pathogen entered the body and hid there. When it erupts, it contends with the body and at that point begins to transform into heat. So although the origin of the illness was cold, when the latent qi erupts it usually presents as a heat pattern. Why does the Huang Di Nei Jing say “injured by cold in winter, one is sure to suffer warm disease in spring”? Precisely because of this transformation from cold to warmth. So Doctor Zhang Xichun kept clearing heat for him — clearing heat on one side, supporting the upright with dang shen on the other — and the heat pathogen was gradually expelled.

Prescription, part two: heat cleared, switch to yam and wolfberry to support the upright and nourish yin

By now most of the heat pathogen was cleared. What was left? The heat of yin deficiency. Doctor Zhang Xichun said: there is still a bit of yin deficiency — what to do? Support the upright qi — once the upright is sufficient, the little remaining pathogen can expel itself. So he gave a second formula:

• Raw Huai Chinese yam, one liang (30 g) — supports the upright qi; greatly tonifies the lung, spleen and kidney channels, especially the spleen — cultivating earth to generate metal (pei tu sheng jin), building the lung qi;
• Gou qi zi (wolfberry), eight qian (24 g) — tonifies the essence of the liver and kidney;
• Xuan shen (figwort root), five qian (15 g) — nourishes yin and draws out heat;
• Raw Huai di huang (Rehmannia), five qian (15 g) — the authentic regional sheng di from Wenxian County, Jiaozuo, Henan; nourishes yin and draws out the pathogen;
• Sha shen (Adenophora root), five qian (15 g) — nourishes yin;
• Bai shao (white peony), three qian (9 g) — nourishes yin;
• Yuan zhi (Polygala root) — regulates the lung’s function;
• Chuan bei mu (Fritillaria bulb), two qian (6 g) — clears heat and resolves phlegm;
• Raw ji nei jin (chicken gizzard lining; Doctor Zhang Xichun specifically marked the golden kind, crushed) — helps the spleen and stomach transform and transport food;
• Gan cao (licorice), one and a half qian — just a very little.

💬 Note from Doctor Luo: You see raw Huai Chinese yam is used again — some friends ask: Doctor Luo, are you only choosing cases that contain yam? No. I am going through Doctor Zhang Xichun’s book from the beginning, case by case, in order. What does this show? When Doctor Zhang Xichun treated lung disease, he used Huai yam heavily — always one liang right from the start. Why nourish yin in large amounts at this stage? Because when clearing latent pathogenic heat, you must draw it out by nourishing yin. I once read Liu Xuan Si Jia Yi An (Liu Baoyi’s Selected Case Records of Four Physicians) by the late-Qing physician Liu Baoyi, and he discussed exactly how to clear latent pathogenic heat — on one side draw out the pathogen, on the other nourish yin; this is called “drawing the pathogen outward” (tou xie wai chu) — dragging the pathogen out from within. When I read that passage I admired it deeply: see how profoundly the ancients thought!

One more herb in this formula deserves attention: raw ji nei jin (chicken gizzard lining) — Doctor Zhang Xichun specifically noted to use the golden kind, crushed into the decoction. Why ji nei jin? First, this man’s spleen and stomach were weak; ji nei jin helps him transform and transport food. Second, the yin-nourishing herbs in this formula tend to be cloying and burdensome to the stomach; the ji nei jin is there to dissolve that cloying quality of the medicinal liquid. So you see — in each of Doctor Zhang Xichun’s cases the thinking behind ji nei jin is sometimes different — sometimes it is used to free the channels and invigorate the blood to resolve stasis. Put all these cases together and you will see exactly why he used it.

Five doses, and the illness was cured: the secret of Doctor Zhang Xichun’s miraculous healing

The second formula was taken for five doses, and the illness was cured — done. Look at this: a severe patient who had been wheezing and coughing, weak and failing — in Doctor Zhang Xichun’s hands, fewer than ten doses in all, and completely cured.

💬 Note from Doctor Luo: What does this show? Doctor Zhang Xichun made accurate diagnoses and used his medicine appropriately. Why is a doctor’s healing like magic? Because his diagnosis is accurate, his medication appropriate — and he was especially good at using authentic regional herbs (dao di herbs). That is precisely why he was a famous physician.

Aftercare: no more decoctions — a bowl of yam powder porridge every day

The illness was cured, but Doctor Zhang Xichun said: at night he still coughed a few times — what to do? Stop the decoctions and switch to food therapy — every day take raw Huai Chinese yam, grind it into a fine powder, cook it into a porridge, add a little sugar, and eat it as a daily snack — supporting the upright qi to consolidate the recovery.

💬 Note from Doctor Luo: See that? This trick appears again — it is Doctor Zhang Xichun’s trump card for treating weak, deficient patients: he always finishes with raw Huai Chinese yam, using yam powder to support the upright qi. We talked about this method yesterday — don’t take it as something casually written down: this method can truly save lives! I have met many people coughing endlessly: coughs after a cold, children coughing for two months — boil yam slices in water and drink it for a few days, and they get better; some adults have a hacking cough for two or three months after a cold — drink yam powder, and in a few days it clears. Doctor Zhang Xichun was not writing nonsense.

Closing: this case teaches us two key points

From this case we learn two things:

First, the latent pathogen (fu xie) as a cause of illness. Indeed, many people’s illnesses come from a pathogen hiding inside, while the body grows weaker and weaker; when the body weakens to a certain point and the weather outside changes, the latent pathogen begins to erupt, and that is when the person falls ill. So when we see a complicated illness, we should think — is there a pathogen hiding inside? Is it a hidden peril buried long ago? For a patient with a complicated condition, a good Chinese medicine practitioner must be able to see it; and we ordinary people should also know that the latent pathogen exists.

Second, the order of treatment: expel the pathogen first, then support the upright. This is an important line of thinking in Chinese medicine — there is a rhythm, a sequence, and a proportion: at first you drive out the pathogen more and support the upright less; then you support the upright more and drive out the pathogen less. The two are weighed against each other.

💬 Note from Doctor Luo: Nobody here needs to become a Chinese medicine practitioner or be able to write prescriptions after listening to me — do not go and match your illness to these formulas. The more we understand formulas, the better we know how to maintain our own bodies, when to take action, when we are deficient, when we are excess. If we understand a little, we will protect our bodies better — that is the purpose of learning Chinese medicine.

Compiled from Doctor Luo Dalun’s lectures on Doctor Zhang Xichun’s case records, from Medical Records Integrated Chinese and Western Medicine (《医学衷中参西录》, published in installments 1918–1934).