Damp, Heavy, Exhausted, Chest Tight, Diarrhea in the Hot Rainy Season? Doctor Luo Dalun Explains Li Dongyuan’s Qing Shu Yi Qi Tang (Clear Summerheat and Boost Qi Decoction) — Full Formula Breakdown

Every year in July and August, the weather turns muggy and hot, and the rain comes down day after day — do you feel exhausted all over, lose your appetite, feel your chest tighten up, and some people have diarrhea every single day? If you’re bothered by this kind of “summer sluggishness,” then you must read today’s article to the end. Doctor Li Dongyuan left behind a very famous formula that many great physicians love to use. It has an extremely wide range of applications — people flexibly modify it, or use it as-is, and it can treat a great many diseases. It is Qing Shu Yi Qi Tang (Clear Summerheat and Boost Qi Decoction).

💬 Note from Doctor Luo: Today we continue with Doctor Li Dongyuan’s famous formula — Qing Shu Yi Qi Tang. Many friends find the composition of this formula complicated, but Doctor Li Dongyuan had a characteristic way of prescribing: he never prescribed a formula in isolation — instead he placed the person inside nature itself — the yearly cycle of qi rising and falling, and he placed the person within it to feel how the body’s qi movement changes with the seasons. So to explain this formula, we have to start with “the sky.”

Section 1: Look at the sky first — why is dampness so heavy in late summer?

Where does Doctor Li Dongyuan place this formula? Under the heading “late summer damp-heat, when the stomach and spleen are trapped most severely” — what does that mean? It means the formula has a seasonal signature: he presents this formula and this method at the time when late-summer damp-heat is at its heaviest and the spleen and stomach are most severely trapped.

When is late summer (chang xia)? The stretch from the end of summer into early autumn. Summer itself is heat (fire-heat), autumn turns cool, and the defining feature of late summer is summerheat-dampness (shu shi) — in the latter stage of summer it rains constantly. Everyone felt it recently: flash floods, thunder and lightning without end, typhoons arriving — after the rain the earth turns to mud, and the dampness is extremely heavy.

💬 Note from Doctor Luo: The defining feature of late summer is that it is both hot and damp. What do you call heat pushed to the extreme? Summerheat (shu) — the “shu” of scorching heat. So Doctor Li Dongyuan says that in late summer, damp-heat is especially heavy, and at that time the spleen and stomach are especially easy to trap. Why? Earth is supposed to control Water — but when the water is too much, it overwhelms and drowns the Earth — that’s what “trapped” means, and the spleen and stomach are hurt the most.

Everyone must remember this clearly: when you use this formula later, you don’t have to wait for late summer, don’t have to wait until July or August — that would be carving the boat to find the fallen sword. Whenever the pattern around you shows severe damp-heat, or the pattern inside your body shows severe damp-heat, and these two factors interact, you may enter this state and can use this formula.

Section 2: What does the patient look like? — Limbs heavy and weary, “wilting” by afternoon

Doctor Li Dongyuan wrote out the symptoms of this state one by one, very clearly. Let’s start with the most core ones:

Limbs heavy and weary, spirit and energy short, too lazy to move. The spleen governs the four limbs — when dampness is heavy, people with weak spleens are trapped even more severely: the limbs have no strength, the legs have no strength at all. In scorching weather everyone has felt it: oh my, no strength at all, especially in the damp south — you feel as if the whole person has been wrung dry. People with sufficient upright qi can still hold up and keep working; people with insufficient upright qi are in trouble — they start to wilt (in northeastern dialect, “fa yan”): the brain won’t turn over, by afternoon they’re overwhelmingly sleepy, spirit and energy short, too lazy to move — ask them to do anything and they don’t want to, they say “let me lie down a while.”

💬 Note from Doctor Luo: Why does everyone identify with this? Because there are so many modern people with spleen deficiency and heavy dampness, and when the outside dampness is heavy on top of that, they basically fall into the pattern. This is precisely the most typical Qing Shu Yi Qi Tang patient: wilted, no strength, too lazy to move.

Section 3: Chest tightness, can’t catch your breath, aching joints — wherever dampness blocks, that’s where the problem appears

Continuing down the list, Doctor Li Dongyuan recorded several more highly representative symptom clusters:

First, chest fullness and short breath (xiong man qi cu). You feel your chest tight and full, breathing short and hurried. This is qi chaos in the chest — clear qi failing to ascend and turbid qi failing to descend — qi stagnating in the chest. The spleen is already very weak, and dampness is squatting inside making trouble, blocking things up, and it can even make you feel your belly is huge — the more water you drink, the bigger the belly, and even breathing becomes an effort. This is dampness squatting in the middle burner and preventing qi from ascending and descending.

Second, heavy aching limbs and joints (zhi jie chen teng). The joints, body and limbs feel heavy, and there are painful spots in the joints. This is dampness obstructing the movement of the channels and collaterals — dampness lodges in the limbs, blocks the channels, and the joints hurt. Many rheumatic-type diseases are exactly like this today: wind, dampness and heat three pathogens tangled together. So pay attention — at this time, warming yang alone is not enough.

Third, qi rushing up with wheezing (qi gao er chuan). You feel you can’t catch your breath. This means the dampness is extremely heavy and the upright qi extremely deficient — dampness has invaded the heart and lungs (the upper burner), called “turbid qi above,” causing heart and lung dysfunction. Elderly people like this start wheezing so badly they can’t catch their breath in this season, and their bodies are terribly uncomfortable.

💬 Note from Doctor Luo: Remember these clusters: chest tightness, heavy aching joints, can’t catch your breath — all signs that dampness is blocking the middle and upper burners and disrupting ascending and descending. If a person is exhausted, chest-tight, and has heavy aching joints, especially obvious in hot weather — then you should think of damp-heat trapping the spleen.

Section 4: Fever, restlessness, bloating, diarrhea — Doctor Li Dongyuan even described the stools in detail

Body heat with restlessness (shen re er fan). Some people develop a fever — in summer when damp-heat is heavy, it gradually feels like a cold, like an external invasion coming on, and the body starts to burn. A feeling of fullness under the heart (xin xia peng pi) — “under the heart” means around the stomach: it feels blocked up inside, because dampness is heavy and the middle burner can’t turn.

Yellow and frequent urine (xiao bian huang er shu). Urine turns yellow — why? Because there’s heat. In scorching weather the dampness inside more easily transforms into heat, so the urine turns yellow. Loose and frequent stools (da bian tang er pin) — stools unformed, and you go often; or diarrhea of yellow mushy stool like congee (xie chu huang ru mi) — it can even be like dysentery, pouring out yellow unformed loose stool; or the color like rice-washing water (mi gan shui).

💬 Note from Doctor Luo: I always say Doctor Li Dongyuan was a true clinical master — his symptom analysis is extremely accurate. Why did his contemporaries call him the “national hand” (guo shou)? Because his prescriptions absolutely worked. His clinical experience was enormously rich. When we do Chinese medicine diagnosis, some symptoms truly deserve to be looked up in Doctor Li Dongyuan’s books. For example, when damp-heat inside is exuberant and the spleen and stomach are weak — if the damp-heat is really exuberant, the stools change and the urine changes too: urine scanty and yellow, and the stools don’t turn dry — instead there’s diarrhea, even constant diarrhea.

Doctor Li Dongyuan’s description of the stool changes is extremely clear. There are really many such people in real life: some northern friends go south, go to Hainan, and have diarrhea every day — why? Damp-heat! The spleen and stomach are weak and can’t take this damp-heat. Some people get diarrhea every summer when it’s hot, thinking they ate something bad outside, bacterial infection, intestinal infection — but they get diarrhea eating at home too. In fact? It’s related to severely deficient upright qi, weak spleen and stomach, and heavy damp-heat inside the body — it’s not about bacteria.

Section 5: Thirsty or not, sweating much or little, what’s the pulse? — Doctor Li Dongyuan covered even these details

Thirst or no thirst (huo ke huo bu ke). Some people feel thirsty, some don’t — not feeling thirsty is normal, why? In such hot weather, with dampness squatting in the middle burner, the person can’t take water in. No desire for food (bu si yin shi) — in summer they don’t want to eat anything, no appetite at all. This is damp-heat trapping the spleen and stomach, so food intake suffers.

Spontaneous sweating (zi han). The body feels extremely heavy and sweats without stopping — sweating in great heat is normal. But some people sweat little — Doctor Li Dongyuan says “the blood is diseased first while qi is not yet diseased” (xue xian bing er qi bu bing ye): this person’s blood is deficient, body fluids severely depleted, so the sweat can’t come out — and then the disease is even more complicated.

The pulse. What’s the pulse in this disease? Large and unhurried (hong da er huan) — the pulse is especially large, beating big, but press deeper and it’s still empty. In hot weather the pulse naturally runs large; don’t be fooled by it. Press deeper and it’s very empty, because upright qi is insufficient. “Unhurried” (huan) indicates insufficient upright qi — but it’s not always unhurried; some pulses beat fast (shu), because there’s heat, damp-heat inside, so you can’t generalize. If dampness and upright qi clash fiercely, if the dampness is so heavy it traps the upright qi, the pulse may instead beat slower (chi).

💬 Note from Doctor Luo: These symptoms vary — some people have more, some fewer, not everyone has them all — but everyone must recognize one point: “the heaven’s summerheat-dampness order is constant” (qi tian shu shi ling ze yi): the weather is heat plus dampness, and the summerheat-dampness pattern is fixed. So what to do? “Treat it with clearing-drying formulas” (yi qing zao zhi ji zhi): clear heat on one side, dispel dampness on the other, and also support a bit of upright qi. That’s the formula Doctor Li Dongyuan created — Qing Shu Yi Qi Tang.

Section 6: Breaking down the formula — huang qi leads, and one herb holds several ideas

Doctor Li Dongyuan’s formulas all look similar (they all use huang qi, ren shen, chen pi, dang gui, sheng ma and the like), but the subtle differences reveal his skill. For this formula he gave two passages of explanation, and his disciple Luo Tianyi wrote them both down and collected them in the book.

First herb: huang qi (Astragalus). Doctor Li Dongyuan always leads with huang qi, but the dose is small — generally one qian (about 3 g), reduced by half a qian if sweating is scant. Why huang qi? He quotes the Nei Jing (Yellow Emperor’s Inner Classic): “yang qi secures the exterior and maintains solidity” (yang qi zhe, wei wai er wei gu) — yang qi protects the body surface and supports upright qi; and “when it is scorching hot, qi leaks out” (gui ze qi xie) — in extreme heat the qi leaks away, summerheat pathogen destroys the stomach qi, the body heats up and sweats, and qi escapes along with the sweat.

💬 Note from Doctor Luo: Doctor Li Dongyuan gives an even deeper explanation afterwards: why are you spleen-deficient? Because your heart fire is too exuberant — hyperactive heart fire turns around and bullies the spleen earth; and not only that, heart fire also injures the lung, the lung qi is attacked and harmed by heat. So it’s not just hot outside — inside, heart fire burns fiercely and bullies the spleen and lung the same way. At this time you must tonify the lung qi — once spleen qi is deficient, lung qi fails first (pi qi yi xu, fei qi xian jue): the spleen and stomach belong to Earth and are the mother of the lung metal; once spleen earth is ruined, the lung’s function of protecting the body surface is finished.

So he uses huang qi, sweet and warm to tonify, as the sovereign herb (gan wen bu zhi, wei jun) — tonifying stomach qi and the qi of the body surface, to nourish the qi of skin and body hair — securing the exterior, “so that one does not sweat spontaneously and thereby damage one’s original qi” (bi bu ling zi han er sun qi yuan qi): don’t keep sweating; the more you sweat, the more original qi you lose; when body fluids inside are insufficient, qi becomes more deficient. You see — one herb, huang qi, tonifies qi, secures the exterior, and prevents qi from escaping with sweat. Several ideas in one.

Ren shen (ginseng) and honey-fried gan cao — the tonify-the-middle-and-boost-qi backbone. Ren shen is used at five fen (about 1.5 g), not much, to tonify the middle, boost qi, and support upright qi — especially when the patient wheezes above, breathes short, and is too lazy to speak (qi shang chuan duan lan yu): that means the heart and lung are weak, especially the lung qi insufficient, and ren shen is used to tonify the upright qi of the upper burner. Honey-fried gan cao is used at three fen (about 1 g) — tonifying the middle burner: besides harmonizing the spleen and stomach and tonifying their original qi, it can also drain fire-heat (licorice has a slight toxin-resolving action, and can drain mild deficiency heat of the upper burner). Use licorice in small amounts; too much easily causes fullness and blocks the middle burner. Huang qi, ren shen and honey-fried gan cao — these three are the tonify-the-middle-and-boost-qi backbone of the formula.

Chen pi (tangerine peel) — moves the qi of the middle burner. Regulates qi and harmonizes the lung, so that what you tonify in doesn’t get too crowded. Doctor Li Dongyuan often classifies chen pi in the tonify-the-middle, support-upright-qi group.

Section 7: Why pair it with dang gui? — Qi is the commander of blood, blood is the mother of qi

The formula also includes dang gui (Chinese angelica), and there’s a reason: while tonifying qi you must also nourish blood. Chinese medicine holds that blood and qi must be joined together — “qi is the commander of blood, blood is the mother of qi” (qi wei xue zhi shuai, xue wei qi zhi mu): blood is the carrier of qi, qi is the motive force of blood; the two are rooted in and generate each other. So tonifying qi also generates blood, and nourishing blood also tonifies qi.

💬 Note from Doctor Luo: Doctor Li Dongyuan thought even further: for everyone in this state, heart fire is exuberant. Exuberant heart fire bullies the spleen — the spleen belongs to Earth; normally fire generates earth, but when heart fire is too exuberant it can instead make the earth system collapse — this is called heart fire encroaching on the spleen (xin huo cheng pi). When heart fire is too exuberant, the blood is certainly attacked — the heart governs the blood vessels (xin zhu xue mai): when this “engine” doesn’t work normally and spins out of control, the circulation in the blood-vessel pipes certainly goes wrong, and the blood is injured. Once blood is injured it can’t generate and develop, yang qi lies dormant in the earth (the “earth” being the spleen), blood and qi both float to the body surface, unable to ascend and spread through the whole body. So Doctor Li Dongyuan, while tonifying qi, adds a bit of blood-nourishing dang gui to harmonize qi and blood — qi and blood generate and spread together through the whole body, and only then can the body function normally.

So you see: in front, huang qi is the sovereign; ren shen, chen pi, dang gui and gan cao are sweet and slightly warm, tonifying the middle and boosting qi as ministers (bu zhong yi qi wei chen).

Section 8: Cang zhu, bai zhu, ze xie — this time, an exception: water-draining herbs

Then come cang zhu and bai zhu (black and white atractylodes) — strengthening the spleen and draining water. The two have different strengths: cang zhu excels at draining water but is not good at holding; bai zhu excels at holding but is not good at moving, not good at attacking — used together, they strengthen the spleen and drain dampness, guiding the water down and out.

Then ze xie (Alisma) to drain water and percolate dampness. Here’s a big point: in Doctor Li Dongyuan’s other formulas, water-draining, dampness-percolating herbs appear very rarely — ze xie, zhu ling, fu ling, deng xin cao, tong cao, mu tong and the like, the herbs that promote urination and drain water-dampness, he rarely used. Why?

💬 Note from Doctor Luo: Doctor Li Dongyuan believed: you have water-dampness inside, but insufficient upright qi is the key. If you force the dampness out with diuretic herbs, the body instead easily gets injured. So this school’s view is: only when dampness is extremely heavy, and at the same time the outside natural summerheat-dampness is also heavy, do you use these herbs. Without such a situation, if you insist on using diuretic percolating herbs, the upright qi will be injured. This is the conclusion of Doctor Li Dongyuan’s clinical experience. People today are used to diuretics and think they’re gentle and harmless — but sometimes, if you don’t strengthen the spleen, don’t support upright qi, and simply push diuresis outward, it doesn’t work.

He gave an example: treating gout. Much of gout treatment pushes turbidity and dampness outward, forcing it out; after the purge the blood uric acid index drops, everyone is happy, and two days later it goes back up — why? Insufficient upright qi is the key. You absolutely must not, the moment you see dampness pathogen, furiously push it outward.

Doctor Li Dongyuan put it even more harshly: when there’s no season, no damp-heat, you’re not sick, and the damp pathogen or the urine is already copious (urination already frequent), and the liver and kidney have not been attacked by pathogen — if you then misuse diuretic herbs, “it will certainly greatly damage true yin” (bi da sun zhen yin) — it damages the kidney essence, percolates and dries up the fluids — and moreover “it will certainly first damage both eyes” (bi xian sun qi liang mu) — the two eyes will be injured first. Why was he so cautious about diuretic percolating herbs? Because medicating has its measure. Some diuretic herbs (certain varieties of mu tong, for instance) have kidney toxicity — used for the right pattern they cure disease; forced and misused they cause harm. Used according to the core pattern there’s no harm; forced use causes harm — mastering the measure is crucial.

💬 Note from Doctor Luo: Let me tell you a real example. A patient told me: he’d watched a health lecture saying that taking fu ling (poria) alone can drain water-dampness, so he took fu ling every day. After a while he said: “I really experienced it — I’m a young man, and I experienced what it’s like to be old: no strength at all, walking hunched over, even walking was a great effort.” That made a deep impression on me. Fu ling is a bland, mild herb — something this gentle, used wrongly, can still cause problems — so it must be used according to the pattern. And cang zhu, bai zhu and ze xie in this formula are specifically for the pattern of “late-summer damp-heat at its heaviest” — where the syndrome exists, use the medicine.

Section 9: Sheng ma, ge gen, shen qu, qing pi, huang bai, Sheng Mai Yin — the rest of the puzzle

Sheng ma and ge gen (sweet, bitter, neutral) — scatter accumulated heat and regulate qi movement. Sheng ma is used to lift the yang qi of the yangming channel; ge gen has a muscle-relieving action — for heavy limbs and aching joints, ge gen specializes in releasing that muscle soreness; ge gen is also a wind herb, able to dispel wind. Paired with the wind herbs in front, the dampness is driven off, and once dampness is gone the spleen’s yang qi can ascend — the qi you tonify in gets lifted upward, and the spleen and stomach form a pattern of both ascending and descending.

Shen qu (medicated leaven) — aids digestion. Dampness is too heavy, the person can’t eat, the stomach is bad; dampness blocks inside causing fullness and rebellion — use shen qu to aid digestion and guide stagnation, opening up the spleen and stomach’s movement.

Qing pi (green tangerine peel, pungent, warm, two and a half fen) — aids digestion and quickens qi. Qing pi is different from chen pi: chen pi is the yellow (mature) peel; qing pi is picked while green — its qi-breaking action is strong, even stronger at regulating qi, it can even break qi. So use only a tiny bit (two and a half fen), and scrape off the white pith inside. Doctor Li Dongyuan was extremely careful with medicating.

Huang bai (phellodendron, wine-fried) — drains heat. Drains the heat of the lower burner and the deficiency heat in the kidney; after wine-frying it can move upward to clear the heart-lung heat of the upper burner. Why must you clear heat? Because at this time the body definitely has damp-heat — the tongue is red, and the coating may be yellow or yellow-greasy. While dispelling dampness you must also drain heat; when using it you can also add a bit more heat-draining herbs.

Ren shen, mai dong, wu wei zi — that’s Sheng Mai Yin (Generate the Pulse Drink). Tonify qi, nourish yin, support upright qi. In summer, when both qi and yin are injured, use Sheng Mai Yin. Doctor Li Dongyuan says “to rescue the summerheat injury to geng metal as assistant” (jiu tian shu zhi shang yu geng jin wei zuo) — summerheat injures the lung metal (geng metal belongs to the lung): summer heat injures the lung metal, and autumn dry-coolness also injures the lung metal — this is the foundation of Chinese medicine. Adding Sheng Mai Yin inside supports upright qi and repairs the qi-yin dual injury caused by hot weather.

💬 Note from Doctor Luo: Put the whole formula together: there are tonify-the-middle-and-boost-qi herbs (huang qi, ren shen, honey-fried gan cao, chen pi, dang gui), water-dampness-draining herbs that go downward (cang zhu, bai zhu, ze xie), yang-lifting herbs that go upward (sheng ma, ge gen), qi-moving digestion-aiding herbs (shen qu, qing pi), heat-clearing (huang bai), and yin-nourishing upright-supporting herbs (ren shen, mai dong, wu wei zi) — Qing Shu Yi Qi Tang is a comprehensive formula. Doctor Li Dongyuan says this is the medicine for the height of the three fu (hottest) periods, when late summer is at its peak (san fu zhong, chang xia zheng wang zhi shi): the weather is scorching, the spleen and stomach are insufficient, qi and yin are both injured, and at the same time there’s damp-heat inside the body — this is when you use it to regulate.

Section 10: How wide is this formula’s application? — From summer sluggishness to diabetes and low potassium

This formula’s applications are wide indeed; many famous Chinese medicine masters excel at using it. As long as a person has dual qi-yin deficiency with damp-heat at work, causing disrupted ascending-descending inside and a trapped spleen and stomach, this medicine can be used — if you count them up, the Western-medicine diagnoses it corresponds to are numerous.

💬 Note from Doctor Luo: Later, Doctor Wang Mengying also created a formula with the same name (Qing Shu Yi Qi Tang) — his version nourishes yin, for when the weather is truly scorching and yin injury dominates. Doctor Li Dongyuan’s formula, in contrast, focuses on tonifying the spleen-stomach upright qi and regulating qi movement — strictly speaking its intent is more orthodox and it covers more situations. Later generations nonetheless thought Doctor Wang Mengying’s version was used more — related to the generally hotter climate of the late Qing dynasty. But Doctor Li Dongyuan’s formula, as I see it now, is actually used more and is more universal: because there are too many people today with spleen-stomach deficiency, and too many situations of hot damp weather — with global warming, damp-heat is increasing. This summer the damp-heat exceeded imagination; even in the northeast I felt the dampness was overwhelming — when I turned on the dehumidifier at home the reading went straight to 80, extremely damp. That’s a true picture of damp-heat afflicting people today.

What can it specifically treat? For example:

Not wanting to eat in summer, no strength — as soon as summer comes, no appetite at all, no strength anywhere, lying around. The old master said: take Qing Shu Yi Qi Tang and it will work; even taking it in advance, these summer-sluggishness symptoms won’t appear;
Diabetes — national medicine master Doctor Yan Dexing (a Chinese medicine master) treated diabetic patients in this state with this formula, and blood sugar gradually returned to normal;
Low potassium — how do you supplement low potassium? As long as a person has dual qi-yin injury, heavy dampness inside, weak spleen and stomach — use this one formula.

💬 Note from Doctor Luo: There’s a question of level here: many famous Chinese medicine masters have their own diagnostic systems; as long as they determine the person has weak spleen and stomach, insufficient upright qi, weakness in all four limbs and constant tiredness, qi deficiency with a bit of yin injury and some damp-heat inside, they’ll give this formula — and the result is immediate. To apply such a formula, the diagnosing physician needs higher cultivation — the symptoms aren’t obvious at first glance; dampness-heaviness and yin deficiency are even somewhat opposite, yet such a person sees it at a glance. Once you master your own diagnostic system, this formula becomes a sharp weapon in your hands — why do old Chinese medicine practitioners love this formula their whole lives? Because it works so reliably. If you don’t know how to recognize when to use it, the weapon won’t fire; once you can recognize it, every shot hits.

Section 11: Why is this a formula worth pondering again and again?

All of Doctor Li Dongyuan’s formulas are highly thought-provoking, and their clinical results are excellent — he was truly a national medical hand. Formulas like this, we should ponder over and over. In fact, once you master Doctor Li Dongyuan’s formulas well, you can treat a great many internal-injury patients — because spleen-stomach deficiency is a huge piece of internal-injury disease, and you can sweep across a wide field. The Earth-Tonifying School theory (bu tu pai) of Doctor Li Dongyuan is well worth learning.

💬 Note from Doctor Luo: Today’s lecture was a bit dry — all Chinese medicine theory, because I was eager to explain this formula and this theory clearly, and some friends may feel dizzy. But everyone must take Qing Shu Yi Qi Tang seriously: the pattern of late-summer damp-heat, trapped spleen and stomach, dual qi-yin injury — there are too many modern people in it. Diagnosis and pattern differentiation are the key; we can discuss this content slowly another time — I work in Chinese medicine diagnosis and especially love studying formula pattern differentiation. Next time we’ll discuss more of Doctor Li Dongyuan’s famous formulas.

What to take away

Qing Shu Yi Qi Tang (Clear Summerheat and Boost Qi Decoction) is Doctor Li Dongyuan’s famous formula from the Pi Wei Lun, aimed at the late-summer pattern of damp-heat trapping the spleen: Earth should control Water, but when the water is too big it drowns the earth, and the spleen-stomach is the one that suffers.
Typical patient: wilted, limbs heavy and weary, lazy to move, chest fullness with short breath, heavy aching joints, fever with restlessness, yellow frequent urine, loose frequent stools or diarrhea (sometimes like congee or rice-washing water), thirst or no thirst, spontaneous sweat or scant sweat, a large but empty unhurried pulse. You don’t need every symptom — the summerheat-dampness pattern itself is the key.
Formula logic in one line: tonify the middle and boost qi (huang qi, ren shen, honey-fried gan cao, chen pi, dang gui) + drain dampness downward (cang zhu, bai zhu, ze xie) + lift yang upward (sheng ma, ge gen) + move qi and aid digestion (shen qu, qing pi) + clear heat (huang bai) + nourish yin and support upright (Sheng Mai Yin: ren shen, mai dong, wu wei zi).
The ze xie exception: Doctor Li Dongyuan almost never used diuretic herbs — forcing diuresis when upright qi is weak injures the body, and misused it always harms the eyes first. Use water-draining herbs only when dampness is genuinely heavy and the natural season is damp too.
Wide modern applications: summer sluggishness (ku xia), diabetes, low potassium — anything where dual qi-yin deficiency plus damp-heat disrupts the body’s ascending and descending. When you learn to recognize the pattern, this formula becomes a weapon that hits every time.

(Compiled from Doctor Luo Dalun’s lecture series on Doctor Li Dongyuan’s formulas. Qing Shu Yi Qi Tang comes from the Pi Wei Lun, the Treatise on the Spleen and Stomach.)