Catch a Cold and Sweat at the Slightest Movement? Afraid of Wind? What Gui Zhi Tang (Cinnamon Twig Decoction) — the First Formula of the Shang Han Lun — Is Really For: Doctor Luo Dalun Explains It All

Patient search terms: cold / sweating during a cold / sweat at the slightest movement / fear of wind / fear of wind and cold / stuffy nose / mild nausea

Corresponding medical names: tai yang wind strike · exterior deficiency pattern of cold damage · early-stage externally contracted illness · disharmony of ying and wei (nutritive and defensive qi)

Opening: the thousand-year question left by the last case

Last time we covered the first case in Doctor Xu Shuwei’s Shang Han Jiu Shi Lun (Ninety Treatises on Cold Damage): in the spring of the geng xu year, Ma Hengdao came down with an externally contracted illness — fever, headache, nasal congestion, dry retching, spontaneous sweating, and aversion to wind — and Doctor Xu diagnosed it as a Gui Zhi Tang pattern. At that time rebel soldiers had breached Zhenzhou, and no peony (shao yao) could be bought from any pharmacy, so Doctor Xu went out to the garden himself, picked peony, and used it in the formula. Everyone said the formula should use white peony (bai shao), but he insisted, “This is exactly what should be used” — he used red peony (chi shao).

💬 Note from Doctor Luo: In Zhang Zhongjing’s day, when a physician wrote a formula he simply wrote two characters, “shao yao” (peony) — no distinction between red and white. It was only by the time of Tao Hongjing that the texts began to divide peony into two kinds: red peony (chi shao) and white peony (bai shao). So which one did Zhang Zhongjing actually use back then? Later generations have argued about this ever since. Doctor Xu Shuwei believed that for Ma Hengdao’s particular condition, red peony was the right choice. Our physicians today generally use white peony. To understand why Doctor Xu insisted on red peony, we first need to understand the formula Gui Zhi Tang itself — what is it really for?

Crown of all formulas: why Zhang Zhongjing put it first

Gui Zhi Tang is the very first formula in the Shang Han Lun. The Shang Han Lun is the clinical foundation of Chinese medicine, and the fact that Zhang Zhongjing placed Gui Zhi Tang at the very beginning of the whole book shows how much he valued it. Later physicians have often called Gui Zhi Tang the “crown of all formulas” — among all of Zhang Zhongjing’s formulas, it ranks first, and it is the most powerful.

So what does Gui Zhi Tang actually treat?

💬 Note from Doctor Luo: We usually say that Gui Zhi Tang treats externally contracted wind-cold — after wind and cold invade the body, if the person’s upright qi (zheng qi) is insufficient, the pattern that results is what we call the exterior deficiency pattern (biao xu zheng). What does such a person look like? They have fever, a raised temperature; they sweat; they are afraid of cold; the nose is a bit stuffy and there is a tendency to retch — Zhang Zhongjing’s original text calls it “nasal congestion with dry retching” (bi ming gan ou), a sign that the spleen and stomach are not quite in harmony; and then there is headache. Among all these, the single most important clue, which I keep stressing, is fear of wind and sweating: when a cold starts with sweating — the kind where you keep touching the forehead, the armpits, and the back of the neck and they are all damp — use Gui Zhi Tang.

Instant results: Doctor Luo keeps this formula stocked at home year-round

For this kind of illness, Gui Zhi Tang truly works almost instantly.

💬 Note from Doctor Luo: I generally keep Gui Zhi Tang at home at all times. When this kind of problem really appears, you brew it right away and it works on the spot. The formula is just a few herbs — gui zhi (cinnamon twig), shao yao (peony), and zhi gan cao (honey-fried licorice) — plus a few slices of fresh ginger you cut yourself, and a few jujube dates split open, all simmered into a drink. But why is it so miraculous?

Harmonizing ying and wei: the core logic of Gui Zhi Tang

To understand Gui Zhi Tang, you first need to understand a very important concept in Chinese medicine — harmonizing ying and wei (ying wei). Zhang Zhongjing believed that the reason a person falls ill like this is that the ying and wei have fallen out of harmony.

What are the ying and wei qi? They are a pair of qi that protect our body and keep it safe from invasion by external pathogens.

💬 Note from Doctor Luo: Our body contains all kinds of qi — upright qi, middle qi, kidney qi, and so on — but you must remember the ying and wei qi. Where do they come from? From the spleen and stomach. The spleen and stomach absorb the grain and water essences (shui gu jing wei) from food, and after absorption they are transported throughout the body. The Huang Di Nei Jing (Yellow Emperor’s Inner Classic) says: “The clear becomes ying; the turbid becomes wei.” What is the difference between the two? It is this: ying travels inside the vessels, wei travels outside the vessels. Ying is the material foundation — the fluids, the tissue fluids and the like — and it moves inside the vessels; wei is the fierce, forceful qi, extremely vigorous, and it moves outside the vessels. Ying belongs to yin, wei belongs to yang. One is a material foundation moving inside the vessels, the other is a force moving outside — the two cooperate, and that is the whole-body circulation of the ying and wei qi.

What is the task of the ying and wei qi? To protect our body, to nourish the five organs (zang), to nourish the limbs and the hundred joints, and to provide defense at the body surface. When they cooperate normally and patrol without losing their rhythm, the body functions normally.

💬 Note from Doctor Luo: Ying qi inside the vessels is the material foundation — it supplies nutrition and support to wei qi; wei qi outside begins protecting the body. The Nei Jing also says that “wei qi emerges from the lower jiao” — why the lower jiao? Because only when the kidney yang of the lower jiao is strong does wei qi gain its true warming action. So wei qi is the nutritive substance that comes from the middle jiao’s spleen and stomach, but its warming power must be ignited by the kidney yang of the lower jiao. That is the complete picture of ying and wei.

When ying and wei fall out of harmony, the body starts to sweat

When the body goes wrong and the ying and wei qi fail to cooperate, the result is sweating. Zhang Zhongjing described this — what exactly did his original text say?

💬 Note from Doctor Luo: Zhang Zhongjing wrote: “Because the wei qi does not harmonize with the rong qi” — the “rong qi” here is the ying qi; in Zhang Zhongjing’s book it is always written “rong.” He means the two qi are not cooperating. There are two ways they fail to cooperate. One is that wei qi is especially strong while ying qi is very weak — inside, ying lacks nourishment, while outside, wei qi is moving with excessive frequency and speed; ying inside cannot hold it, so it forces the ying yin outward, and that produces sweating. The other is that wei qi is weak and ying qi relatively strong — wei qi cannot control ying qi, ying qi loses its restraint, and it simply seeps out from the inside on its own; that also produces sweating. In reality, whether wei is strong and ying weak or ying strong and wei weak, the two influence each other and often transform into one another.

For this “disharmony,” Doctor Luo has a wonderfully vivid analogy:

💬 Note from Doctor Luo: How can I describe this? It is like riding a bicycle — when you ride normally, applying even force, both wheels roll straight ahead together. But when your body becomes weak, the moment you loosen your grip the bike starts to wobble; the two wheels swing left and right, back and forth, and they are no longer in harmony. When the body is weak, the ying and wei qi behave exactly like that — mutually out of step, and that disharmony lets external pathogens in. What do you do then? You must harmonize ying and wei. The most famous formula for harmonizing ying and wei is Gui Zhi Tang.

Breaking down the formula: how can just a few herbs harmonize ying and wei?

Why are Zhang Zhongjing’s formulas so brilliant? Because every single herb points at one direction — he never uses a superfluous herb. Once he laid down this theoretical framework, later generations could fill it in and modify it freely — Doctor Zhang Xichun, for example, frequently adapted his formulas.

How does Gui Zhi Tang harmonize ying and wei? Look at these herbs:

Gui zhi (cinnamon twig): pungent and warm — it is warming; it is the tender branch of the same tree that gives us cinnamon bark. Its job is to unblock yang and assist wei — being warm, once taken it unblocks the yang qi and helps wei qi circulate. Now that ying and wei are out of harmony and the whole defense system is not running smoothly, gui zhi makes it run better.
Shao yao (peony; here we are talking about white peony, bai shao): sour and cold; its job is to restrain yin — to gather the ying yin back and hold the yin qi in. When your ying qi is insufficient, peony nourishes yin and gathers it with its sourness, topping up your ying yin.
Zhi gan cao (honey-fried licorice): fortifies the spleen and stomach, harmonizes all the herbs, and holds the center of the middle jiao.
Sheng jiang (fresh ginger): warm, it assists gui zhi.
Da zao (jujube): sweet, it nourishes the blood and assists shao yao — because ying is essentially the same thing as blood and tissue fluids, these material foundations, so nourishing the blood is nourishing the ying.

💬 Note from Doctor Luo: Look at this formula — one herb regulates wei, one replenishes ying, both ends are covered. Peony paired with licorice, sour and sweet together engender yin (suan gan hua yin), nourishing the ying yin. Within this formula cold and warm are combined, firmness and gentleness balance each other: gui zhi can induce sweating and ginger can induce sweating, but peony’s sour astringency stops you from sweating too much — that is what “harmonizing ying and wei” means. After drinking it, a slight sheen of sweat appears, and the illness is cured.

The second layer: Gui Zhi Tang is really regulating the spleen and stomach

This formula has an even deeper meaning. The ying and wei qi both emerge from the middle jiao — the middle jiao’s spleen and stomach absorb the nutrients. So in essence, Gui Zhi Tang is also a formula for regulating the spleen and stomach.

💬 Note from Doctor Luo: Look at gui zhi, sheng jiang, da zao, and gan cao — which one of them does not regulate the spleen and stomach? Gui zhi is the tender branch of the cinnamon tree; in ancient formulas cinnamon bark and cinnamon twig were sometimes confused, but both are from the bark and branches of the cinnamon tree, with a warm fragrance that regulates the spleen and stomach. Ginger and jujube are even more clearly spleen-stomach regulators — in Zhang Zhongjing’s formulas, whenever he wanted to protect the spleen and stomach, he put in ginger and jujube. Interestingly, some Japanese scholars later researched why Japanese cuisine is called “ryori” (li li in Chinese, meaning “to attend to” or “cuisine”). Originally “li li” meant “attending to a patient” — back then people always used ginger and jujube when caring for the sick, and gradually these ingredients moved into cooking. So the very name “Japanese cuisine” traces back to Zhang Zhongjing! This embodies the principle of medicine and food sharing the same origin (yao shi tong yuan).

The key lies in the second layer: if you double the amount of peony in Gui Zhi Tang and add some malt sugar (yi tang), it becomes Jian Zhong Tang (Fortify the Middle Decoction) — and what does Jian Zhong Tang do? It fortifies the spleen and stomach. Add huang qi (Astragalus) and it becomes Huang Qi Jian Zhong Tang (Astragalus Fortify the Middle Decoction).

💬 Note from Doctor Luo: Isn’t this wonderful — Gui Zhi Tang and Jian Zhong Tang have almost identical ingredients, yet one releases the exterior and the other fortifies the spleen and stomach, purely because the peony was doubled and malt sugar added! So when I use Huang Qi Jian Zhong Tang, what do I usually treat? Stomach ulcers — especially ulcers brought on by emotional distress and the like; the results are excellent. Why? Because where do your ying and wei qi come from? From the middle jiao’s spleen and stomach. Now the spleen and stomach’s ability to absorb and transport has weakened, and the channels have become blocked — Gui Zhi Tang both strengthens the spleen and stomach and opens up the passageway at the same time. So when Zhang Zhongjing put this formula in the first position of the Shang Han Lun, the message could not be clearer: the body’s upright qi is the most important thing. Flip through this formula — is there a single herb that clears heat or resolves toxins? Is there anything that kills bacteria or viruses? No. It is all about regulating the spleen and stomach.

The third layer: the foundation of Gui Zhi Tang is the Yang Dan Tang of the Tang Ye Jing Fa

Dig deeper and this formula has a pedigree. There is a book called the Fu Xing Jue (Fu Xing Jue Zang Fu Yong Yao Fa Yao, Methods for Using Medicinals by Organ, from the Secret Transmissions), which is said to reflect the thinking of the ancient Tang Ye Jing Fa (Methods of the Decoctions and Waters) — when Zhang Zhongjing wrote the Shang Han Za Bing Lun (Treatise on Cold Damage and Miscellaneous Diseases), he borrowed formulas from the Tang Ye Jing Fa, changed their names, and renamed them after their main herbs.

💬 Note from Doctor Luo: Gui Zhi Tang was originally called Yang Dan Tang (Sunrise Decoction) — a formula that engenders yang qi. There was also a Yin Dan Tang, and then what else? Qing Long (Azure Dragon), Bai Hu (White Tiger), Zhu Que (Vermilion Bird), Xuan Wu (Black Tortoise) — this is the system of formulas in the Tang Ye Jing Fa that corresponds to the four seasons and regulates the body. Zhang Zhongjing took these formulas over, some renamed and some not, and placed them in his own book. In Yang Dan Tang, what does gui zhi do? It regulates the liver — gui zhi is pungent in flavor and engenders the liver’s yang qi, supplementing yang; shao yao, meanwhile, fortifies the spleen and restrains the liver’s yin. Gui zhi is pungent, shao yao is sour — pungent and sour together harmonize the liver (xin suan hua gan) — when the pungent and sour flavors are combined they generate and harmonize the liver qi, and once the liver qi is harmonized, it enters the spleen.

The fourth layer: by regulating the liver, let the spleen and stomach recover on their own

So how does “pungent and sour harmonizing the liver” become “regulating the spleen and stomach”? This is the most exquisite stroke in Zhang Zhongjing’s formulas.

💬 Note from Doctor Luo: Think about it — why does our spleen and stomach fall out of harmony and grow weak? A very important reason is that the liver has a problem — the liver governs free coursing (shu xie), and the liver qi has become bound up. Gui zhi can engender the liver’s yang qi, shao yao can restrain the liver’s yin; once the liver qi is regulated — the liver belongs to wood, the spleen belongs to earth, and wood normally attacks earth — when the liver qi is free and harmonious, wood no longer attacks earth, earth can develop and transport normally, and the spleen and stomach begin to recover. Add gan cao, sheng jiang, and da zao to help the spleen and stomach recover — and this forms a complete strategy: soothe the liver, relieve the pressure on the spleen, and let the spleen recover freely. Think one step further: because your spleen and stomach qi are insufficient, your ying and wei qi cannot circulate properly — there must be a problem with the ability to course and discharge. The liver governs free coursing, and gui zhi and shao yao both regulate the liver; when the liver’s coursing ability is strengthened, the passage of the ying and wei qi is no longer a problem. So seen this way, Gui Zhi Tang is also a formula that harmonizes the liver and spleen!

💬 Note from Doctor Luo: If you truly understand all this, you realize the human body is one integrated whole in which everything affects everything else. In Zhang Zhongjing’s era, how did he know that emotions are connected to the spleen and stomach? He was already applying it — look at what happens when a person is regulated this way: the liver gains free coursing, the spleen and stomach recover, and the ying and wei qi flow freely; once they flow freely, the body produces a slight sweat, the defensive troops arrive at their posts, and they drive the external pathogen out — and the illness is cured. He adjusted the body through the flavor and qi of the herbs — nature, flavor, and channel tropism: pungent and sour harmonize the liver, harmonizing the liver leads into the spleen, and what is regulated is the spleen and stomach. Sometimes you feel the effect the moment you drink it — this is exactly why.

The practical rule: recognize fear of wind, fear of cold, and spontaneous sweating — drink it at the first sign

After all this theory, the practical application comes down to one sentence: at the very start of an externally contracted illness, recognize these three things: “fear of wind, fear of cold, spontaneous sweating.”

💬 Note from Doctor Luo: When you catch wind-cold and begin sneezing, running a runny nose, and feeling tight all over, and on top of that the person keeps sweating — this is clearly an exterior invasion on a deficient constitution: the middle jiao is weak, the spleen and stomach are weak, and the upright qi is insufficient. At this point ying and wei are out of harmony, and in most cases wei qi is strong — wei qi wants to rise up and fight, but ying qi is insufficient, and in fighting it forces the ying yin out, hence the sweating. There are also people who sweat all the time as a habit, sweating at the slightest movement — that is wei qi deficiency, ying qi without restraint seeping out on its own. Both situations occur. But whichever it is, as long as you see a person continually sweating, afraid of cold and wind, with a touch of a cold coming on — use Gui Zhi Tang. As long as your diagnosis is accurate — fear of wind, fear of cold, spontaneous sweating — drink Gui Zhi Tang at the first moment, and it hits the mark almost every single time. Why is it called the crown of all formulas? This is exactly why: Zhang Zhongjing placed it first, and the deep meaning is — the Shang Han Lun is not about clearing heat, resolving toxins, killing bacteria, or destroying viruses; supporting the upright qi is the first line of defense: the strategies for regulating the spleen and stomach and the liver are all here. What I harmonize is the qi movement circulating inside you; I strengthen the function of your spleen and stomach, get it moving again, and let your upright qi push the external pathogen out.

Closing: the secret of red peony versus white peony — to be continued tomorrow

Today we have fully explained the meaning of Gui Zhi Tang — but the secret of why Doctor Xu Shuwei used red peony (chi shao) is still unrevealed. What exactly is the difference between red peony and white peony? Why did Doctor Xu insist on red peony?

💬 Note from Doctor Luo: The secret Doctor Xu Shuwei reveals — we will continue tomorrow. Besides the difference between red and white peony, I also think we should talk a bit more about how Gui Zhi Tang is applied in internal miscellaneous diseases. That is all for today — once everyone understands the meaning of this formula’s composition, we are in good shape. Next we will talk about how to apply this formula. Thank you all — see you tomorrow.

Compiled from Doctor Luo Dalun’s lecture series on the case records of Doctor Xu Shuwei.