Child with High Fever Who Vomits Every Medicine? Doctor Zhang Xichun Cooled His Seven-Year-Old Son’s Fever with Raw Gypsum Alone
Patient search terms: child with high fever / child’s fever that won’t come down / vomits every medicine / won’t take medicine / cold with fever and black tongue coating / child’s external-contraction fever — what to do
Medical terms for this condition: external-contraction fever (wind-cold transforming into heat) · excess heat in the Yangming level · high fever in a child
Opening: one herb — raw gypsum — ranks first in Doctor Zhang Xichun’s book
Hello, friends. Today we continue our discussion of how Doctor Zhang Xichun treated illness. Up to now we’ve been talking about how Doctor Zhang Xichun used renshen (ginseng) — as for ginseng, we’ll leave it to be discussed another day under other physicians, because many doctors of the Ming dynasty, for example, were especially skilled with it. Today we’re switching to a different herb — and this is the one that represents Doctor Zhang Xichun’s greatest insight of all.
Which one? Sheng shi gao (raw gypsum).
💬 Note from Doctor Luo: Why do I say raw gypsum was Doctor Zhang Xichun’s greatest insight? Go and look at his book: in his discussion of all the herbs, the section on raw gypsum is placed first, and he wrote about it more than any other. Why have we only gotten to it now? Because raw gypsum is an herb that expels pathogenic factors — it’s used to treat external-contraction illnesses and infectious fevers — so we save it for later and explain it slowly.
So how is raw gypsum actually used? Let’s start with the most legendary application in Doctor Zhang Xichun’s career — this time, he was treating his own son.
Who was the patient? His own eldest son, just seven years old
The patient was Doctor Zhang Xichun’s eldest son, only seven years old at the time. What illness did the child have? A wind-cold cold (feng han gan mao).
💬 Note from Doctor Luo: With a wind-cold cold, the cold evil (han xie) is on the body surface at first, then it begins to move inward. The body sees that an external evil has invaded, so it fights back — and the fight produces fever. So the child burned for four or five days, and his body turned intensely hot — he was running a high fever.
How high? Look at the tongue — the tongue coating was yellow and turning black.
How sick was he? Even his tongue coating was scorched black
Ordinary people who don’t know medicine might hear “tongue coating yellow and turning black” and have no idea what it means. Let Doctor Luo translate:
💬 Note from Doctor Luo: A yellow tongue coating means there is heat inside; and when the yellow carries black in it, that means what? It means the heat is extremely severe — this is not an ordinary cold with a fever; the heat has already gone deep. A child this young, burning for four or five days, with interior heat this heavy — of course the family was beside themselves.
So why, after four or five days of fever, had it still not been properly treated? Because the child refused to take medicine. Every time they gave him the herbal decoction, he vomited without stopping — the medicine went in and came right back out, completely, so there was no way to get the medicine into him at all.
The hardest obstacle: the medicine won’t go in — what do you do?
When a child is sick, the most headache-inducing problem is getting the medicine down. The high fever won’t come down, but the medicine is vomited the moment it’s swallowed — you can’t just stand there and watch, can you?
💬 Note from Doctor Luo: This is the difficulty every parent faces — the child refuses the medicine and vomits as soon as he drinks it. How did Doctor Zhang Xichun solve it? He didn’t force-feed. Instead he thought of a clever approach: since the child couldn’t take a compound formula, he would use a single herb — raw gypsum alone — keep the taste simple, decoct the soup crystal clear, and feed it slowly in small portions.
The prescription: raw gypsum alone, 1 liang — about 30 grams today
The prescription Doctor Zhang Xichun wrote was so simple it was hard to believe — raw gypsum, one single herb.
The first time, he used 1 liang of raw gypsum — 1 liang equals about 30 grams today. For a seven-year-old child to take 30 grams of raw gypsum at once was already a heavy dose for the era. How was it given? Decocted into a clear liquid (qing tang), divided into three portions, and fed to the child bit by bit while still warm.
💬 Note from Doctor Luo: Let me explain something here: the clear soup decocted from raw gypsum actually contains very little of the water-soluble active ingredient — what is raw gypsum? It’s hydrated calcium sulfate, which is basically the same as boiling a stone; very little of it comes out into the water. So when some people say “raw gypsum can’t be used in large doses,” Doctor Zhang Xichun didn’t think it was that serious. He later said again and again that raw gypsum is not that cold at all — use it with confidence.
After the first dose, the illness began to ease. Getting better, right?
If 1 liang isn’t enough, use 2: the child’s fever, and Doctor Zhang Xichun raising the dose
Doctor Zhang Xichun saw it was working, so he pressed on — he decocted 2 liang of raw gypsum next — and 2 liang is 60 grams. He prepared the clear soup and slowly gave it to the child.
💬 Note from Doctor Luo: Look at this approach to medication: it wasn’t about writing a big compound formula all at once, but one herb, raised dose by dose. First 1 liang — improvement. Then 2 liang — push it up further. This is the experience Doctor Zhang Xichun tested out on his own child — it turned out raw gypsum could be used this way, in doses this large!
After the 2 liang went down, the illness eased again, and the fever dropped a little more.
3 liang down, 6 liang in a day and night — the illness was cured
Doctor Zhang Xichun said: what to do? Keep going! He decocted 3 liang of raw gypsum next — how many grams is 3 liang? 90 grams. Count it up: 1 liang, 2 liang, 3 liang added together — over a hundred grams, close to 200.
💬 Note from Doctor Luo: This time the 3-liang gypsum water was still drunk warm. After it went down, the illness was cured — the heat was cleared just like that. Doctor Zhang Xichun recorded it himself: this seven-year-old child used 6 liang of raw gypsum in a single day and night! Six liang — about 180 grams in today’s measure.
And the most astonishing part? After the illness was cured, the child’s appetite was even better than before!
The finishing touch: after all that gypsum, his appetite improved instead
Most people would worry: gypsum is such a “cold” herb — won’t taking a lot of it hurt the Stomach? But this child — his appetite wasn’t damaged at all; it actually improved — not the slightest harm to the Spleen and Stomach from cold (han zhong).
💬 Note from Doctor Luo: What does “han zhong” (cold striking the middle) mean? It means the Spleen and Stomach have been chilled, and you can’t eat. This child took 6 liang of raw gypsum into his belly, and his Spleen and Stomach weren’t chilled one bit — his appetite even got better. Doctor Zhang Xichun himself was pondering this: so is gypsum truly “greatly cold,” as people say, or only mildly cold? — He used his own son to test the true temperament of raw gypsum: it is mildly cold, it clears and vents heat superbly, and it isn’t that chilling after all.
From that moment on, Doctor Zhang Xichun’s confidence in raw gypsum was firmly established. Before this, when he used gypsum, he generally used only 6 or 9 qian; this heavy use was his first time. The more he used it, the more skillful he became, until it ended up as the herb he mastered best in his whole life.
Where did this experience come from? Miao Xiyong of the Ming dynasty had already used it this way
Do you think heavy-dosed raw gypsum was Doctor Zhang Xichun’s invention? No. This experience actually has a lineage —
💬 Note from Doctor Luo: Many physicians of the past excelled at raw gypsum, and among them Miao Xiyong (Miao Zhongchun) of the Ming dynasty was especially skilled, and used it in very large doses. He specifically discussed raw gypsum and said one extremely important thing: “Used in small amounts, it has no effect at all.” Doctor Zhang Xichun learned this experience from Miao Xiyung, then verified it himself on his own child — and it was confirmed at once.
At that time Doctor Zhang Xichun was still young — he didn’t go to Shenyang to open his first Chinese medicine hospital until he was past fifty — and this case of treating his child was an experience he accumulated in his younger years. From then on, his raw-gypsum cases accumulated more and more, he used it with ever greater fluency, and he finally became a great master especially skilled in raw gypsum.
Bonus: before using gypsum, learn to tell “raw” from “calcined”
At the very end, Doctor Luo Dalun wants to warn everyone about the easiest mistake to make — when buying gypsum, you must distinguish sheng shi gao (raw gypsum) from duan shi gao (calcined gypsum):
💬 Note from Doctor Luo: Many people are afraid to use raw gypsum because they’ve heard it’s greatly cold, so they go and buy “calcined gypsum” instead — that’s wrong! Calcined gypsum is for external use — when there’s a boil or an open wound, grind calcined gypsum into powder and use it to astringe and regenerate tissue; it must never be taken internally. For internal use you must use raw gypsum. When you go to a pharmacy and buy raw gypsum, it usually comes as very fine granules, like MSG — shiny, very hard. That’s raw gypsum; you can crush it and decoct it in water. Its flavor is pungent and sweet, its nature mildly cold, and it enters the Lung and Stomach channels. It can clear heat and purge fire, venting the heat evil out from within, and it also relieves vexation and quenches thirst. And don’t forget: Baihu Tang (White Tiger Decoction) of Zhang Zhongjing in the Han dynasty contains raw gypsum — this herb was already treasured by the ancients long ago.
So exactly how did Doctor Zhang Xichun use raw gypsum to resolve the heat of external-contraction illness? Today we’ve only opened the door. Over the next few days, we’ll explain in detail this herb that Doctor Zhang Xichun mastered so well.
Compiled from Doctor Luo Dalun’s commentary on the case records of Doctor Zhang Xichun; the case is from Records of Chinese Medicine with Western Reference (《医学衷中参西录》), published in installments 1918–1934.