Diarrhea at Dawn, Right on Schedule Every Morning? Doctor Xue Lizhai Treats Cockcrow Diarrhea (Wuweizi San and Bawei Wan)

Patient’s search terms: diarrhea right before dawn / wu geng xie (cockcrow diarrhea) / morning stomach trouble / diarrhea right on schedule / afraid of cold with cold hands and feet / getting thinner every day

Medical terms: wu geng xie xie (cockcrow diarrhea) · shen xie (kidney diarrhea) · kidney yang deficiency · ming men fire decline · kidney essence deficiency

Opening: a kind of diarrhea that is terribly punctual

There is a type of diarrhea that is extraordinarily punctual — every single day, right at dawn, just as the sky is about to lighten, the stomach starts to ache, and you must run to the toilet to empty out once. After that one trip, you are fine for the rest of the day. Doctor Luo Dalun says this illness has a special name in Chinese medicine: wu geng xie (cockcrow diarrhea).

💬 Note from Doctor Luo: In its classic form, wu geng xie attacks right on schedule — the diarrhea comes exactly around dawn. In a less typical form, you may simply get a stomachache when it is time to get up in the morning and have to go once. Do not dismiss that “on schedule” detail — the punctuality itself is an important diagnostic clue.

Who was the patient: an official named Shen who had stomach trouble before sunrise every day

The patient was called Shen Dayin — actually, “Dayin” was the respectful form of address used for county magistrates and officials of that rank in the old days. His surname was Shen; his given name was never recorded. His complaint: every morning at the fifth watch, right on schedule, his stomach rebelled.

What time is “the fifth watch”? Night watchmen kept the hours in ancient China

First, let us clarify what the fifth watch means. In ancient times, the night was divided into five segments, and for each segment someone walked the streets beating a wooden clapper or drum to reassure people that all was well — that was “keeping the watches.”

💬 Note from Doctor Luo: The fifth watch is the last segment of the night, roughly approaching five o’clock in the morning — that is, a little after four, when the sky is about to lighten. In classical terms this moment is also called “ping dan” (level dawn). So wu geng xie means diarrhea that comes with a stomachache at dawn, right as the sky is turning light.

The diagnostic high point: Doctor Xue Lizhai’s one-sentence verdict — this is kidney diarrhea, kidney yang deficiency

After examining him, Doctor Xue Lizhai pronounced: this is kidney diarrhea — more precisely, kidney yang deficiency.

💬 Note from Doctor Luo: Why is dawn the most likely time for this kind of diarrhea? The night has run its course, and at this hour the yin qi is still heavy while the yang qi is about to begin rising — the body is shifting from stillness to motion. When yin and yang are in transition, if the yang qi is insufficient and the yin cold is too heavy, the balance cannot hold, and the result shows up as diarrhea. So wu geng xie, in general, points to kidney yang deficiency.

Anatomy of the prescription: Wuweizi San — a famous formula Xu Shuwei collected in the Puji Benshi Fang

The formula Doctor Xue Lizhai used is called Wuweizi San (Schisandra Powder). It is a celebrated formula, originating in the Puji Benshi Fang (Experiential Prescriptions of Universal Benefit) compiled in the Song dynasty by Xu Shuwei.

💬 Note from Doctor Luo: Xu Shuwei was a master of the classical formulas — one of the founders of the classical-formula school — and everything he collected were formulas he had personally seen work. His eye for what was genuine was extraordinary. Many later physicians treated the Puji Benshi Fang as a secret treasure under their pillows — Ye Tianshi, for instance, kept it there and flipped through it every day. As for this Wuweizi San: Xu Shuwei once heard that a friend of his had chronic diarrhea, and another physician diagnosed it as kidney diarrhea and cured him with this formula. Xu thought the formula was genuinely good, so he recorded it in his book. The formula is beautifully simple: two liang of wu wei zi (schisandra fruit) and half a liang of wu zhu yu (evodia fruit) — two herbs, stir-fried together until fragrant, ground into powder, and a little taken each time. Wu wei zi is sour and astringent: it gathers the yang qi and binds the stool. Wu zhu yu warms the lower burner, and it especially warms the liver — the liver governs coursing and dredging and likes to send qi upward. Wu wei zi gathers the yang qi in, wu zhu yu warms things up below, the qi moves upward, and the diarrhea naturally stops. The physicians of old held this formula in high regard and often paired it with Sishen Wan (Four Spirits Pill) — the classic combination for wu geng xie caused by insufficiency of kidney qi and kidney yang.

The result: a few days of it, and he was better

Doctor Xue Lizhai ground the Wuweizi San into powder and had him take it — within a few days he was cured. The record reads simply: “after taking it, he recovered.”

A setback in treatment: bad habits returned, and the diarrhea came back

But before long the illness returned. The cause is written out plainly: careless living and uncontrolled diet — poor lifestyle habits, overwork and exhaustion, indulgence without restraint, and eating without any discipline.

💬 Note from Doctor Luo: Those four characters, “careless living,” cover an enormous amount of ground: whether you dress warmly enough, whether your room is cold and damp, whether you are overindulging in sexual activity… and indulgence is a very large part of it. Careless living wounds the upright qi; add uncontrolled eating on top of that, and with the upright qi insufficient and the yang qi insufficient, trouble is guaranteed. This flare-up was different from the first: day and night without pause, diarrhea around the clock; intolerance of cold; food that was very hard to digest; and the man thinning day by day — the plump body he used to have was now gaunt. Doctor Xue Lizhai looked at him and saw: this is no simple chill — this is ming men fire decline (decline of the life-gate fire). The yang qi was truly depleted.

The second prescription: Bawei Wan — when kidney essence is gone, warming yang alone is not enough; you must tonify the kidney

This time Doctor Xue Lizhai switched formulas: Bawei Wan (Eight-Ingredient Pill) — that is, Guifu Dihuang Wan (Cinnamon and Aconite Rehmannia Pill, also known as Jingui Shenqi Wan / the Kidney Qi Pill from the Essentials of the Golden Cabinet). After taking it, the diarrhea stopped and his eating returned to normal — the record says “the diarrhea ceased and food was taken in again.”

💬 Note from Doctor Luo: This is the layering you see in a great physician’s case records — a few short lines, two formulas, and there is real depth here. In the first stage, the patient was somewhat deficient, but invasion by cold was the main issue: cold had wounded the yang qi of the kidney. Think of drinking iced beer every day, iced drinks every day, or dressing too thinly in cold weather — the cold evil injures the yang qi inside the kidney. At that stage, invasion by external evil is the main problem, and warming fixes it quickly: Sishen Wan or Wuweizi San to warm yang and bind the stool, and a few doses get you through. But ask yourself: why was it this man who got hurt and not somebody else? It means his kidney qi was already insufficient to begin with — he was not a constitutionally robust person, so when the same cold hit, he was the first to fall. In the second stage, kidney essence was greatly depleted — the deficiency of kidney essence left the kidney yang insufficient too, and now deficiency itself is the main problem. That cannot be fixed in a few doses. When kidney essence runs short, the loss can develop in two directions: some people drift toward kidney yin deficiency, others toward kidney yang deficiency. This man had always been a yang-deficient constitution, so he drifted toward yang. When the kidney essence is gone, the kidney qi has nothing to draw on; the qi lacks the power to transform food and water, so he could not eat and grew thinner and thinner — the vitality of life (sheng ji) was slowly guttering out. At this point you use Bawei Wan to warm and tonify kidney yang, transform qi and move water, and rebuild the foundation underneath.

What do people with kidney essence and kidney yang deficiency look like? — a blind-date story

At this point Doctor Luo Dalun teaches everyone to recognize this constitution: people with kidney essence and kidney yang deficiency are usually afraid of cold — they wear one more layer of clothing than everyone else; their hands and feet are cold; they get up at night to urinate — a lot of urine at night, less during the day; they want their water hot; their urine is clear and copious; their complexion is pale and bloodless — occasionally, if there is a little deficient fire, the face may carry a faint flush, but most often it is pale; their lower back and knees feel weak and sore; and during the day they are drowsy, always wanting to sleep, mentally vague.

💬 Note from Doctor Luo: Let me tell you something that happened on Weibo that cracked me up. A young woman had studied a bit of Chinese medicine and went on a blind date. She shook hands with the young man — cold hands. He sat down — wearing one more layer than everyone else. He drank his water — it had to be hot. He kept going to the bathroom. And his complexion was pale. The young woman did the arithmetic in her head — kidney yang deficiency — eliminated! Nowadays a great many young people, especially young men, with all kinds of poor lifestyle habits, look exactly like this: not brimming with vitality and rosy-cheeked, but worn out, listless, and running to the toilet with diarrhea every day. There are plenty of middle-aged and older people like this too — most of them have overdrawn their kidney essence, usually through indulgence.

A key point about medication: with chronic diarrhea, do not grab berberine the moment it starts

Finally, Doctor Luo Dalun adds a special warning: when you run into this kind of long-term, chronic diarrhea, do not casually take berberine (huang lian su).

💬 Note from Doctor Luo: Berberine treats damp-heat dysentery — the kind of diarrhea you get from eating something bad. Chronic diarrhea is not necessarily damp-heat; very often it is exactly the opposite — insufficient upright qi, insufficient yang qi, deficiency of kidney qi. The textbooks say damp-heat diarrhea comes out yellow-brown and stinking, but that is not actually reliable: diarrhea from ming men fire decline can also be yellow-brown with a slightly fishy odor. To judge diarrhea, do not only look at whether the anus feels hot or what color the stool is — look at the whole-body symptoms: fear of cold, drowsiness and fatigue, cold hands and feet — those signs of yang insufficiency are all present, and you should be thinking kidney essence and kidney yang deficiency. Damp-heat does not last that long. When someone keeps having diarrhea, always, endlessly, you should strongly suspect kidney yang deficiency. And one more thing, the most important: once the kidney essence and kidney yang are already depleted, you must restrain yourself — no more indulgence, no more spending what little you have. Take the medicine and nurture the body at the same time, and only then can it recover. Otherwise the medicine tops up your spirit, and off you go spending it again — the illness only gets worse.

A bout of diarrhea at the fifth watch, at the junction of yin and yang, is the lamp of kidney yang burning ever dimmer. Doctor Xue Lizhai first used Wuweizi San to warm the lamp, then Bawei Wan to pour in the oil — first warming back the yang that cold evil had wounded, then slowly replenishing the kidney essence that had been spent. Those two steps are the clearest road map for treating kidney-deficiency diarrhea.

Compiled from Doctor Luo Dalun’s lecture explaining the case records of Doctor Xue Lizhai; the cases are from Xue’s Case Records (《薛氏医案》).