Chronic Cough, Wheezing at the Slightest Effort, Spontaneous Sweating, and Overall Weakness? Doctor Zhang Xichun’s One-Ingredient Yam Drink: Boil a Single Herb — Chinese Yam — in Water and Drink It Like Tea to Nourish the Lungs, Spleen and Kidneys

What patients search for: chronic cough / wheezing at the slightest effort / spontaneous sweating / general weakness / diarrhea / consumptive weakness from tuberculosis / drinking Chinese yam water

Medical terms: consumptive disease (lao zhai) with deficiency · spontaneous sweating from qi deficiency · unsettled heart qi · slippery diarrhea from spleen deficiency · depletion of the yin aspect

Opening: the humblest, most miraculous ingredient in Doctor Zhang Xichun’s entire pharmacy

Doctor Luo Dalun continues his walk through Doctor Zhang Xichun’s formulas, following the order of the book. Today’s formula is so simple it cannot be simpler — the whole prescription is a single herb.

💬 Note from Doctor Luo: Today’s formula is especially simple. Following the order of the book, what we are talking about today is called the One-Ingredient Yam Drink. This is one of the biggest things I ever got out of reading Doctor Zhang Xichun — when I was studying medicine it gave me a huge inspiration. Later, whenever I treated critically ill patients, this is the method I used to reverse the course of their illness.

What is shu yu? It is the old name for Chinese yam. Long ago yam was called shu yu, and it was only renamed shan yao to avoid the taboo of a Tang-dynasty emperor’s personal name.

💬 Note from Doctor Luo: The formula is simple, but Zhang Xichun, through countless clinical trials, gradually filtered out this one herb that can reverse the course of illness and greatly nourish the lungs, spleen and kidneys. In the past many people did not believe yam could do this; and even now far too many doctors do not believe it either — because they have never seriously tried it. This formula is simple, but I want to remind everyone to take it seriously. It is just a food-therapy formula — how simple, and yet how great an effect it can have.

How is it used? The book states it clearly: take four liang of raw huai yam, slice it, boil into two big bowls of decoction, and sip it slowly like tea.

💬 Note from Doctor Luo: I have explained this raw huai yam before — it is the dried yam slices, huai yam slices. Remember: not fresh yam, dried yam slices. Four liang converts to 120 grams in today’s measure — a hundred-plus grams of yam slices, add water, boil out two big bowls, then drink it like tea, like a beverage. Let it cool to warm and slowly drink it all.

How can one single yam treat so many illnesses?

What can one yam treat? Zhang Xichun lists a long string of conditions in the book: consumptive fever (lao zhai), wheezing or coughing, spontaneous sweating, palpitations (zheng chong), and slippery diarrhea caused by impaired urination — in short, every condition involving depletion of the yin aspect.

💬 Note from Doctor Luo: He is very clear about lao zhai — that is tuberculosis, consumptive lung disease. Tuberculosis patients run fevers, and Zhang Xichun used this huai yam decoction to support the upright qi — you have a fever from tuberculosis, don’t you? Support your upright qi, let your body’s resistance slowly grow stronger, and then the body solves the problem itself. The wheezing and coughing he mentions afterward are not necessarily tuberculosis patients — ordinary patients with wheezing and cough also respond. Spontaneous sweating is qi-deficiency sweating: when upright qi is insufficient and lung qi is weak, a person sweats on his own. Palpitations mean the heart flutters in fits — again from insufficient upright qi, unsettled heart qi, restless spirit. As for slippery diarrhea caused by impaired urination: when the body’s qi transformation is insufficient, fluids cannot leave through the small intestine, so they pour out as slippery diarrhea — yam treats that too.

Why can one yam manage all of this? Zhang Xichun explains: yam is white in color and enters the lungs, sweet in taste and returns to the spleen, and rich in thick juice that benefits the kidneys — so it tonifies the lungs, the spleen, and the kidneys in one stroke.

💬 Note from Doctor Luo: Boiled, yam tastes slightly sweet, and sweetness returns to the spleen; its juice is thick, and thickness benefits the kidneys. So you can see yam tonifies the lungs, spleen and kidneys. Zhang Xichun also said yam can moisten the blood vessels — that is his own observation — and can secure qi transformation: when qi transformation is impaired, it tonifies the qi and holds it in place. Then it stops cough and calms wheezing, because when the spleen and lungs are tonified and their qi is sufficient, any lurking pathogen is pushed out; and where there is no pathogen but the spleen and lungs are deficient, it tonifies the lungs so that phlegm and fluids dissolve on their own. It can also strengthen the will and nurture the spirit — it settles the mind. This is an extremely comprehensive herb.

There is a deeper layer here that Zhang Xichun did not spell out, and Doctor Luo points it out for everyone — yam is a jing-tonifying herb (a herb that replenishes essence).

💬 Note from Doctor Luo: Yam, prepared rehmannia, dogwood fruit (shan zhu yu), goji berries — all of these are jing-tonifying herbs. Whether it is qi deficiency or yin deficiency, the root cause eventually traces back to jing deficiency — when jing is depleted it produces both qi deficiency and yin deficiency, so replenishing jing is the foundation. Look at the conditions Zhang Xichun attaches to this formula: qi deficiency, insecure lung qi, heart qi insufficiency with an unsettled spirit, impaired qi transformation in the lower burner, and a good deal of yin deficiency — very mixed. Why can a single herb treat all of it? Because replenishing jing is the root.

Many earlier physicians treated yam as nothing more than an ordinary food and never realized how well it works. It was Zhang Xichun who dug out yam’s medicinal power, and he was exceptionally skilled at applying it — every case he records is brilliant.

💬 Note from Doctor Luo: Some herbs Zhang Xichun used to the extreme; he understood them that deeply. Take yam — I value huai yam especially, and that is entirely because of Zhang Xichun’s influence. Some people later wondered: are these cases real? Can it really be that miraculous? You cannot know without practicing it. Once you really use huai yam, you understand — it really is this miraculous.

Case one: at dawn, the girl’s pulse scattered like floating hemp on water

Zhang Xichun gives several examples after the formula. The first: an unmarried serving girl (a shi nü) caught a febrile epidemic disease, with profuse phlegm and urgent wheezing — a sign that her upright qi was insufficient.

💬 Note from Doctor Luo: Zhang Xichun gave her Xiao Qing Long Tang plus gypsum (Minor Blue-Green Dragon Decoction). We have discussed Xiao Qing Long Tang before — it is used when retained fluids bind with exterior cold. But here there was heat in the body, and since an external pathogen had entered, he added raw gypsum. Following the Modification Rules of the Treatise on Cold Damage, since she was wheezing he removed ephedra and added apricot kernel. After this formula, the girl’s wheezing settled.

She took the medicine in the evening and passed a peaceful night. Then, at dawn, the wheezing suddenly exploded — and when he took her pulse, things looked bad.

💬 Note from Doctor Luo: The pulse scattered like floating hemp on water — drifting upward, the beats indistinguishable in count, racing. This showed insufficient upright qi, qi on the verge of desertion — a very dangerous state. There was no time to fetch more medicine, but luckily he had some raw yam — about two liang — right at hand, so he quickly boiled it into a decoction for her. After she drank it, the wheezing quieted a little and the pulse reined in somewhat — and that bought the time needed to go fetch the real medicine.

Using that breathing room, Zhang Xichun prescribed a formula called Xian Lu Tang (Fresh Dew Decoction) — built on raw gypsum and forsythia, which he will discuss in detail later — and again used yam in heavy dosage. The girl was finally saved.

💬 Note from Doctor Luo: Many of a herb’s uses are discovered gradually in the course of treating patients. I believe every Chinese physician goes through this process: you use a herb somewhat experimentally — and hey, it works! You ponder why; it turns out to have this function; next time you meet the same situation you use it again, and sure enough it works immediately. So that herb becomes one you reach for naturally. Huai yam was used so often in Zhang Xichun’s hands precisely because it worked so smoothly for him.

Case two: the girl whose periods had stopped for a year — one month of yam water brought them back

The second case is another unmarried serving girl: her periods had stopped for over a year, and by now she had become consumptive — the illness had already developed into tuberculosis.

💬 Note from Doctor Luo: Her body’s resources had been consumed so severely that her periods had stopped entirely. She lay in bed unable to rise, extremely weak. Zhang Xichun gave her Zi Sheng Tang (Nourish Life Decoction) — which we covered earlier: it opens with one liang of raw yam, plus scrophularia, atractylodes and so on — it tonifies the spleen — and adds chicken’s gizzard lining (ji nei jin). After using it, Zhang Xichun felt it was not enough, so he also had her boil four liang of raw yam daily into a decoction to drink like tea.

Here Zhang Xichun records the standard way to drink the One-Ingredient Yam Drink: don’t throw away the dregs — when the water is gone, add more water and keep boiling.

💬 Note from Doctor Luo: Every day she boiled it as a beverage and drank it like tea. How? When you finish the water, add more; don’t throw away those 120 grams of yam — add water and boil again; finish, add water, boil again. All day long she drank nothing else — only this yam water, using it to replace her ordinary drinking water. And she took Zi Sheng Tang at the same time.

What was the result? One month later her body was restored, and her periods had returned.

💬 Note from Doctor Luo: The body slowly recovered — a patient so weak that even her periods had stopped ended up fully recovering. That is no small feat. So you see what yam can do; the more it is used, the smoother it works.

Doctor Luo’s own experience: an asthma patient so wrecked by steroids he could barely walk

After Zhang Xichun’s cases, Doctor Luo tells one from his own practice — the older brother of a middle-school classmate, in very poor health with depleted upright qi, who had developed asthma.

💬 Note from Doctor Luo: How severe was his asthma? Steroids had been pushed to the absolute limit and still could not control the illness; it seemed the Western doctors had run out of options. At that point they came to me. The steroids had made him bloated and weak — he could barely walk, and everyone had to support him to get him through the door. I could see his asthma had been triggered by an external contraction, so I first gave him formulas to scatter the external pathogen and resolve the exterior. But once the exterior was resolved, his body was still weak — he wheezed after two steps and could not climb stairs.

What to do? Doctor Luo used exactly Zhang Xichun’s method — 100 grams of dried huai yam slices boiled in water every day as his only drink; whenever he drank, he drank that water.

💬 Note from Doctor Luo: And the more he used it, the better his body became, and slowly he recovered. Now he moves normally and can do all kinds of things. He runs a Buddhist friends’ circle and studies Buddhism every day. The friends around him all say I fished him back from the jaws of death. Later, whenever I met asthma patients, I basically had them all drink yam water — the results were excellent. Why? Because we learned from Zhang Xichun that when an illness comes from insufficient upright qi — asthma where the lungs, spleen and kidneys are all deficient — what do you do? Support the upright qi. Don’t rush; there is no instant miracle formula. Slowly nourish with huai yam; as the upright qi gradually fills, recovery follows.

Case three: violent wheezing and drenching sweat after childbirth — the more the doctors tonified, the more she sweated

Now Zhang Xichun’s third case: a woman who, about ten days after childbirth, suddenly developed violent wheezing and drenching sweat, with fever and a consumptive cough — wheezing badly, pouring sweat, utterly depleted — the classic picture of upright qi unable to hold on.

💬 Note from Doctor Luo: The other doctors all used astragalus, prepared rehmannia, white peony and similar herbs — and the more they tonified, the more she sweated. What to do? They called in Zhang Xichun. He looked and found the pulse extremely deficient and rapid — more than seven beats per breath — which showed upright qi unable to hold on. Reading pulse and symptoms together, this was heading toward untreatable — as if the illness had no remedy left. The woman had probably been weak to begin with, carried the pregnancy only with difficulty, and after giving birth her upright qi was gravely damaged. This kind of case is genuinely very hard to treat.

Zhang Xichun’s method: immediately use six liang of raw yam — dried yam slices, six liang being nearly 200 grams — boiled into water and drunk slowly; when the water was gone he added more and kept boiling. For a full day and night she drank nothing but this yam water; the next day he gave another six liang, again to drink through the day.

💬 Note from Doctor Luo: Earlier, when he wrote the formula, he did not describe drinking it this way — it said four liang, drunk like tea, two big bowls. In fact, for a severely ill person, this is how you drink it all day long. So this new mother drank it that way — and what happened? After three days all her illnesses were cured. Her primordial qi recovered, her upright qi filled, and she was well. Think about it — it took just three days. The earlier doctors could not tonify her no matter what; the more they tried, the more she sweated. Zhang Xichun used a single herb, six liang of yam, drunk as water — a little at a time, bit by bit — and cured her in three days. The more you use this herb, the more miraculous it becomes; the more you use it, the more refined your skill.

Case four: the epidemic fever broke, but the patient diarrheaed himself into wheezing

Case four: a man in his forties had a febrile epidemic illness for over ten days; the fire of the external contraction had subsided by eighty or ninety percent — and then his stools suddenly turned to slippery diarrhea.

💬 Note from Doctor Luo: The moment the lower body let go, the upper body turned catastrophic — he began wheezing, short of breath, breathing urgently, with vexing thirst. When his pulse was taken, it was extremely deficient, and both chi positions (the kidney positions) vanished at the lightest press — the kidney qi was insufficient. What does that mean, reading pulse and symptoms together? His upright qi was insufficient, his body’s fluids had been gravely consumed, and nothing could hold things in — hence the slippery diarrhea. At this point the priority is to support upright qi.

How? Still with Zhang Xichun’s favorite huai yam: six liang, boiled into two big bowls, cooled to warm and drunk like tea; when the decoction was finished he added water and drank the dregs again. In two days he consumed eighteen liang of yam in total.

💬 Note from Doctor Luo: Eighteen liang in two days — that shows he used it in excess. The six liang were boiled until the dregs nearly dissolved, then he added more — in effect using six lots of six liang. Two days later the wheezing and vexing thirst were cured, and his stools were no longer slippery — back to normal. You see how Zhang Xichun used yam: the further he went, the more masterful. He excelled at using a single herb in heavy dosage, boiled and drunk as tea, as water — all day drinking only that — greatly nourishing the lungs, spleen and kidneys and greatly supporting upright qi, enough to reverse a desperate situation.

Why does Zhang Xichun’s yam work when ours does nothing? — the story of lu-tu yam

When Doctor Luo was studying Zhang Xichun’s case records, he pondered one question every day: how did Zhang Xichun cure people so fast? Looking and looking, yam was the main herb in the front half of the book.

💬 Note from Doctor Luo: We have covered the earlier formulas — in this book where Zhang Xichun prescribes his own medicines, the front part is all heavy yam. So why doesn’t it work when we use it? Let me tell you: the yam we used was like drinking nothing — not the slightest effect. I asked myself why. So later I made a special trip to Jiaozuo, Henan, and went to the fields in Wen County to study it — and then I understood: dao-di herbs (authentic, geographically true medicinal materials) carry real power.

Wen County grows lu-tu yam (yam grown in the hard, sticky lu soil), and Doctor Luo later promoted it tirelessly. At the time nobody wanted to grow it anymore — the young people would not follow the old farmers into the fields; they all switched to the sandy-soil yam of Hebei and Shandong — also “iron-stick” yam, slender, straight and smooth.

💬 Note from Doctor Luo: They thought sandy-soil yam was easier — because with lu-tu yam, one planting year means eight years of soil restoration; the cost is too high. So I pushed them to grow lu-tu yam as much as possible. Later I also urged them to grow it pesticide-free — no pesticides, no chemical fertilizer, no growth promoters, no herbicides. Now it is grown, and using this yam is the same as using what the ancients used: the land is the same land, the yam is the same yam, with none of those additives — the medicinal power is the same. Used like this, the effect can match Zhang Xichun’s.

So when our herbs sometimes feel weak and ineffective, the truth is the Chinese medicine itself has gone wrong.

💬 Note from Doctor Luo: Restoring dao-di herbs, discarding the false and keeping the true — this work is extremely important. They are really doing it slowly. If we don’t, then in the future people will mock Chinese medicine for prescribing formulas that do nothing — and that would betray our ancestors. They left all of this to us; Zhang Xichun wrote it all so clearly in his book. You use it and get no effect — why? Because the herb is wrong. So we have to restore it, bit by bit.

Dear or cheap: one bucket of yam vs. half a year of colds

This restoration work sometimes draws criticism, because ordinary people love cheap things.

💬 Note from Doctor Luo: If you grow it carefully on that plot without pesticides, without chemical fertilizer, without herbicides, the yield will not reach half of the original — they tell me now it does not even reach half, less than half. So the price must double. And once the price doubles, people prefer to buy the cheap one. A friend left a message: other people sell yam so cheaply, why is yours so expensive? I think that person has not thought it through — one cold, and an IV drip can cost you 2,000 yuan without blinking. An asthma case or another serious illness, or a patient in emergency rescue, can turn dangerous at any moment — tens of thousands of yuan in the ICU may be spent. Yam money is actually very cheap — relatively speaking, very cheap.

Yam grown with herbicides, chemical fertilizer and pesticides differs enormously in quality from the original medicinal material. And one bucket of pure yam can solve a great many problems — Doctor Luo uses it that way himself.

💬 Note from Doctor Luo: I carry a bucket of yam with me every day. I don’t eat it ordinarily — only when I catch a chill and feel a cold coming on, then I take it and push the cold back. One bucket of yam lasts me about half a year. You use pure yam to fend off half a year of colds, versus going for an IV drip that costs one or two thousand yuan a time — which is the better deal? But if everyone refuses to support pesticide-free yam and buys the cheap fertilizer-heavy stuff, the medicinal power is completely different. And what harm do those herbicides do? Think about which is worth more — saving a few yuan at the knife’s edge is not worth it.

Speaking of the state of Chinese medicine, Doctor Luo has a very heartfelt observation: basically every Chinese herb on the market can be found to exceed some limit — heavy metals, pesticides, fertilizer residues.

💬 Note from Doctor Luo: Abroad it must be zero residue — Chinese herbs exported to Germany must be zero-residue; sold to Japan they are all zero-residue. So the herbs foreigners eat are all pesticide-free, all as clean as what the Chinese ancients used. The herbs Chinese people eat are full of residues. Why? Because foreigners pay a good price. They tell the farmer: grow me everything pesticide-free; if I find any residue, too bad — your entire crop is wasted. So the farmer would rather add nothing and earn that high profit. On our side, people just want cheap — cheaper, even cheaper. We support bad money, and in the end bad money drives out good, leaving the whole domestic Chinese-herb market in a worrying state.

Doctor Luo has kept working to change this — he has raised the idea with many large pharmaceutical companies, like Tong Ren Tang and Kangmei Pharmaceutical: can you grow some pesticide-free herbs?

💬 Note from Doctor Luo: It is genuinely difficult, because ordinary people don’t recognize it. But gradually it will improve. For example, Tong Ren Tang has started — they are moving toward pesticide-free production, learning from Japanese companies. Some companies really won’t do it, and in the end they will fall behind. We ordinary people should also come to recognize the importance of dao-di herbs and pesticide-free Chinese medicine. Never mind the snide remarks from colleagues — I will keep doing this. As long as my followers can actually eat the same yam Zhang Xichun used, I am happy, and I am satisfied.

Closing: how many lives has one yam saved?

The One-Ingredient Yam Drink — the entire formula is a single herb, simple beyond simple — yet it is the one that Zhang Xichun filtered out of countless clinical trials, a yam that reverses the course of illness and greatly nourishes the lungs, spleen and kidneys.

💬 Note from Doctor Luo: This one herb, yam, treats consumptive fever, stops cough and calms wheezing, cures qi-deficiency spontaneous sweating, settles the spirit, treats slippery diarrhea from impaired urination, and replenishes jing to secure the root. When I was studying medicine this formula inspired me greatly, and later, whenever I treated critically ill patients, this was the method I used to reverse the course of their illness. The formula looks simple — but please take it seriously. It is just a food-therapy formula — how simple, and yet how much it can do for our health.

What to take away

One herb, three organs. Yam is white and enters the lungs, sweet and enters the spleen, rich in thick juice that benefits the kidneys — it tonifies lung, spleen and kidney together, moistens the blood vessels, secures qi transformation, stops cough and wheezing, and steadies the mind.
The root is jing. Whether qi deficiency or yin deficiency, the root cause is eventually depletion of jing (essence). Yam, prepared rehmannia, dogwood fruit and goji berries are all jing-tonifying herbs — replenishing jing is the fundamental treatment.
Drink it as your only beverage. Four liang (120 g) of dried huai yam slices boiled into two big bowls, sipped warm like tea; don’t throw away the dregs — add water and boil again, replacing all your drinking water for the day.
Serious illness, serious dosage. In critical cases Zhang Xichun used six liang a day (nearly 200 g), even eighteen liang in two days — a postpartum woman with violent wheezing and pouring sweat was cured in three days of drinking nothing but yam water.
Quality of the herb matters. Dao-di herbs carry real power: the lu-tu yam of Wen County, Henan (one planting year, eight years of soil restoration), grown pesticide-free, is the yam that achieves Zhang Xichun’s effects. The reason our herbs often “do nothing” is that the herb itself has gone wrong.
Practical habit. Doctor Luo drinks yam water whenever he feels a chill and a cold is coming on — one bucket of pure yam fends off about half a year of colds, far cheaper than one IV drip.

Compiled from Doctor Luo Dalun’s commentary on Doctor Zhang Xichun’s case records; the cases come from Records of Chinese Medicine with Reference to Western Medicine (Yi Xue Zhong Zhong Can Xi Lu, published in installments from 1918 to 1934).