Read this first
When to worry
Loose stools are common and usually dietary. The presentations below are the ones that are not, and the first group should not wait. Blood in the stool in particular is never something to read about first.
Get help now — same day or emergency
- Black tarry stools, or vomit that looks like coffee grounds.
- Visible blood in the stool, or bleeding with dizziness or a racing heart.
- Severe abdominal pain with diarrhoea, especially with fever, or with no urine passed.
- Diarrhoea after recent antibiotics with fever and abdominal pain — this can be a serious infection.
- Diarrhoea in a frail older person with confusion or drowsiness — dehydration escalates quickly.
Get it looked at within days
- Diarrhoea that wakes you at night. Night-time diarrhoea is more often organic than functional.
- Unintentional weight loss, or diarrhoea lasting more than four weeks.
- A persistent change in bowel habit over 50, or a family history of bowel cancer.
- Loose stools with a new rash, joint pain, mouth ulcers, or eye inflammation.
- Diarrhoea that began with a new medicine, or with a new supplement.
The rest of the page assumes none of the above. One practical point: a change that has lasted more than a month is worth a conversation with a clinician even if none of the flags apply.
One rule for this whole list: if you are not sure whether a line applies to you, treat it as though it does — and get it checked. Uncertainty is a reason to be seen, not a reason to wait.
Four kinds of loose stool
The classical vocabulary distinguishes these, and so does modern gastroenterology. Two are pattern questions, one is often a food question, and one usually needs examining.
Loose but formed
Soft, unformed, once or twice a day, no urgency, no pain. Often worse in the morning and after cold food.
Points to The standard spleen qi deficiency presentation. The most responsive to ordinary dietary measures and the least worrying.
Urgent, with cramping
A sudden need to go, cramping pain that is relieved by passing stool, sometimes several times in a morning.
Points to Liver qi constraint overlying a weak spleen in the tradition. Also the description of irritable bowel syndrome, which is a diagnosis of exclusion.
Undigested food visible
Recognisable fragments of food in the stool, often with a sense of incomplete digestion and fullness after eating.
Points to The classical 完谷不化, read as spleen and kidney yang deficiency. In practice, check teeth and chewing first, then consider pancreatic function.
Sticky and hard to wipe
Not watery, but adherent, leaving a residue, often with a burning sensation and an offensive smell.
Points to Damp-heat in the tradition. This is the one that responds to reducing rich, oily and sweet food rather than to warming measures.
What the patterns describe
Two questions separate most cases. The first is whether the stool is loose or urgent. Looseness alone is a capacity problem — the digestion is not finishing the job — and the tradition reads it as spleen deficiency, with the measures being warm cooked food, regular timing and less raw material. Urgency with cramping is a movement problem, and the traditional reading is constraint: the gut is being driven rather than failing.
The second is whether there is heat. Sticky, burning, offensive stool with a yellow greasy tongue coat is damp-heat, and the measures are the opposite of the ones for deficiency — reduce rich, fried and sweet food, reduce alcohol, and do not add warming spices in the belief that loose stool always means cold. This is the single most common self-treatment error in this area.
What the tradition does not do — and this needs saying plainly — is distinguish inflammatory bowel disease, coeliac disease, bile acid malabsorption, infection and irritable bowel. Those are distinguished by tests. The pattern reading is a way of organising what you notice and deciding what to change for two weeks; it is not a way of deciding whether you need a colonoscopy.
Which patterns it belongs to
These are the patterns this symptom is conventionally grouped under. They are not competing diagnoses — most people meet one, and the point of the list is to show you which questions separate them.
Loose stools, tiredness after eating, poor appetite, a pale tongue with teeth marks, a weak pulse.
The default reading for loose but formed stool without urgency.
Read the pattern page →Sticky stools, burning on passing, a yellow greasy tongue coat, a bitter taste, a slippery rapid pulse.
Best fit for sticky, burning, offensive stool.
Read the pattern page →Sticky stools, heaviness, a muzzy head, a thick greasy coat, no thirst.
When the stool is loose and the whole body feels heavy.
Read the pattern page →Urgency, cramping relieved by passing stool, rib-side tightness, worse before a period or in tense weeks.
For the urgent, cramping, stress-linked kind.
Read the pattern page →Loose, pale stool with undigested food; worse after cold drinks or raw food; a cold, dull abdominal ache relieved by warmth and pressure; cold hands and feet; a pale, wet tongue.
Loose stools that contain recognizable food, come urgently in the morning and get worse after cold drinks are a different problem from stools that are merely frequent — cold is part of the picture.
Read the pattern page →The signs behind it
Each line below is one entry in the sign table — the same table the self-check draws its follow-up questions from. The tier says how strongly that sign points at the pattern: a defining sign is expected, a common one is usual, a supporting one is optional.
- Loose or unformed stools Spleen qi deficiencydefining ·Spleen yang deficiencydefining ·Dampnesscommon ·Kidney yang deficiencycommon
- Urgent stools soon after waking Spleen qi deficiencycommon ·Kidney yang deficiencycommon ·Spleen yang deficiencycommon ·Kidney yin deficiencysupporting
- Alternating constipation and loose stools Liver qi stagnationsupporting ·Spleen qi deficiencysupporting
- Undigested food visible in the stool Spleen yang deficiencydefining ·Kidney yang deficiencysupporting
Not every sign listed here will apply to you — a sign only counts alongside the others. The self-check is the place to weigh them against your own answers.
Telling them apart
Four questions do most of the work. Each one splits the field in half, and after two or three the pattern is usually clear enough to act on — or clear enough to know that the answer is medical rather than traditional.
| Question | If yes | If no |
|---|---|---|
| Is it loose, or is it urgent? | Loose but not urgent → spleen deficiency. Warm cooked food and regular timing are the measures. | Urgent with cramping, relieved by going → constraint. The measures are about tension and meal structure. |
| Is the stool sticky or burning? | Yes, with an offensive smell → damp-heat. Reduce rich, fried, sweet food and alcohol; do not add warming spices. | No heat signs → deficiency is the better reading. |
| Does it wake you at night? | Yes → this is more often organic than functional. Have it examined before treating it as a pattern. | Only during the day → a functional pattern is plausible. |
| Did it start with antibiotics, a new medicine, or travel? | Yes → an infection or a drug effect comes first. This is not a pattern question yet. | Gradual onset over months → pattern work is reasonable, with the caveat above about the four-week mark. |
What you can do at home
None of this treats a named condition, and none of it replaces assessment. These are the ordinary measures attached to this symptom — low risk, and worth doing while you work out what is actually going on.
- Cook your vegetables for two weeks. This is the single most reliable measure for the deficiency type and costs nothing to test.
- Eat at the same times daily, and do not eat late. Regularity does more for stool consistency than any specific food.
- Reduce raw cold drinks, iced water and large amounts of fruit juice. These are the most common aggravators of the loose-but-formed type.
- If the stool is sticky and burning, go the other way: cut fried food, rich sauces, alcohol and refined sugar for two weeks. Damp-heat does not respond to warming food.
- Note the Bristol stool type once a day for two weeks rather than describing it from memory. The pattern across days is more informative than any single episode, and it is what a clinician will ask for.
Classical sources
Quoted in the original, with our own translation and the chapter it comes from. We do not reproduce existing English translations — they are someone else's reading.
清气在下，则生飧泄。 qīng qì zài xià, zé shēng sūn xiè
When the clear qi is below, there is undigested diarrhoea.
虚则腹满肠鸣，飧泄食不化。 xū zé fù mǎn cháng míng, sūn xiè shí bù huà
When deficient, there is abdominal fullness, bowel sounds, and diarrhoea with undigested food.
入五藏则䐜满闭塞，下为飧泄，久为肠澼。 rù wǔ zàng zé chēn mǎn bì sè, xià wéi sūn xiè, jiǔ wéi cháng pì
Entering the five organs, it produces fullness and blockage, below it produces undigested diarrhoea, and in time it becomes intestinal dysentery.
All three citations use 飧泄, which is usually translated as diarrhoea with undigested food. The third adds a progression the modern reader should notice: 久为肠澼, "in time it becomes intestinal dysentery". The classical authors did not treat chronic loose stool as a minor nuisance, and the four-week rule on this page follows that instinct rather than contradicting it.
Terms used on this page
One concept, several names. The standard term comes first; pinyin and characters are there so you can search and cross-check; older aliases are what you will meet in other people's writing.
| Standard term | Pinyin | 中文 | Also written as |
|---|---|---|---|
| Loose stool | biàn táng | 便溏 | 溏泄 (loose discharge), 大便不成形 |
| Undigested diarrhoea | sūn xiè | 飧泄 | 完谷不化 (food not transformed) |
| Damp-heat | shī rè | 湿热 | 湿热下注 (damp-heat pouring downward) |
| Intestinal dysentery | cháng pì | 肠澼 | 痢疾 in later usage |
Check your own pattern
Loose stools is a symptom, and symptoms appear in several patterns. The self-check weighs twelve questions against all twelve patterns and shows you what fits — and what doesn't quite.
Start the self-checkAbout four minutes. No account, nothing stored on a server, and an address for the printable report is optional.