Read this first
When to worry
Most itching is dry skin or eczema and is treatable at home. The reason to read this section is a small category: generalised itching with no rash, which is a recognised presentation of several internal conditions and occasionally the first one noticed.
Get help now — same day or emergency
- Widespread itching with yellowing of the eyes or skin, pale stools or dark urine. Bile duct obstruction needs urgent assessment.
- Itching with breathlessness, wheeze or swelling of the lips or tongue. Anaphylaxis is an emergency, not an itch.
- A new widespread rash with fever and skin peeling or blistering, especially after starting a medicine. Stevens-Johnson syndrome and toxic epidermal necrolysis are emergencies.
- Whole-body redness with scaling and shivering — erythroderma. It can destabilise temperature and heart rate and needs admitting, not a stronger cream.
Get it looked at within days
- Generalised itching with no rash at all, lasting more than two weeks. This is the presentation that warrants a full blood count, liver and kidney function, and thyroid tests — and it is the one most often dismissed as dry skin.
- Itching with unexplained weight loss, drenching night sweats, or a lump anywhere. Lymphoma can present as itch before anything else is found.
- Itching that is worst after a hot bath or shower, in someone over 60, with fatigue — this is a classic presentation of a blood disorder and is worth a blood count.
- Itching confined to the hands and feet with a rash between the fingers or on the wrists, worse at night. Scabies needs treating in the whole household, not just the person itching.
- A rash that is not responding to emollients and a mild steroid after two weeks, or that is spreading despite treatment.
One practical distinction is worth more than any pattern here. Itch that comes with a rash you can see is a skin question. Itch with nothing to see, generalised and persistent, is a whole-body question — and the tests are cheap. "It must be the dry weather" is the usual reason a blood count is delayed by a year.
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.
Three kinds of itch
The traditional account describes itch as wind — something that moves, appears and disappears, and changes location. What distinguishes the presentations is what the skin looks like and what the itch does over time.
Dry, flaky, worse in winter and after washing
No rash or a faint fine scaling, worse on the shins and forearms, worse after a hot shower, with dry eyes, thin hair and a pale complexion, often in an older person.
Points to Read as blood deficiency generating wind — the skin is not being nourished, so it itches. The direction is to moisten and build, and drying treatments make it worse. This is the commonest presentation in older skin.
Red, weeping, crusted, worse in heat
Visible rash, oozing or crusting, worse in humidity and after alcohol or rich food, with a sticky mouth and a greasy tongue coat.
Points to Read as damp-heat. The direction is to clear and drain, and it is the presentation where the visible rash and the internal picture agree most closely.
Moving itch with raised welts
Hives that appear and vanish within hours, moving from place to place, triggered by heat, stress, pressure or a food, with a normal-looking skin between episodes.
Points to Read as wind, in the narrow sense the tradition uses — sudden onset, changing location, no fixed site. Wind-heat if the welts are red and worse with heat; wind-cold if they are pale and worse with cold.
What the patterns describe
Itch is the one complaint where "there is nothing to see" changes the whole investigation rather than merely the treatment. A rash gives you a location and a morphology, and both traditions use them. Generalised itch with normal skin gives you neither, and the list of things that produce it is short and mostly internal: cholestasis, chronic kidney disease, thyroid disease, iron deficiency, polycythaemia, and lymphoma. All of those are found by blood tests, and none of them are found by looking harder at the skin.
The traditional idea of wind is worth explaining rather than translating. Wind in this system is not a substance and not a draught of air; it is a description of behaviour — things that come suddenly, move, change and leave without a trace are said to be wind-like. Hives are the clearest example, which is why the analogy was made. The useful consequence is that a treatment for wind is not a treatment for dryness, and a person with hives and a person with dry winter itch need opposite approaches despite using the same word for the sensation.
The overlap with modern dermatology is largest at the two ends. Dry skin with fine scaling in an older person is a barrier problem in both accounts, and emollients are the answer in both — generously, applied within minutes of a bath, not rubbed in sparingly. Visible red weeping eczema is inflammation in both accounts, and both would say do not add heat. Where the accounts diverge is the middle, and the middle is where most people actually are.
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.
Dry skin and brittle nails, pale complexion and lips, thin pulse, dry eyes, thinning hair, itch worse at night.
The commonest presentation — dry, flaky, worse in winter and after washing.
Read the pattern page →Red weeping rash, sticky mouth, greasy tongue coat, slippery rapid pulse, worse with alcohol and rich food.
The weeping, crusted, heat-aggravated type.
Read the pattern page →Raised welts that come and go, worse in stressful weeks, sighing, distension under the ribs, a wiry pulse.
Welts and itching that arrive with stress and settle when it does.
Read the pattern page →Fatigue, loose stools, poor appetite, ankle swelling, a pale swollen tongue with teeth marks.
Itch with swelling, heaviness and digestive signs.
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.
- Itchy or weeping skin eruptions Damp-heatcommon ·Dampnesssupporting
- Dry skin, brittle nails or thinning hair Blood deficiencycommon ·Kidney yin deficiencysupporting ·Kidney yang deficiencysupporting ·Liver yin deficiencysupporting
- Pale complexion Blood deficiencydefining ·Qi deficiencycommon ·Spleen qi deficiencysupporting
- Sticky sensation in the mouth Dampnesscommon ·Damp-heatcommon
- Slippery rapid pulse Damp-heatdefining ·Phlegmsupporting
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 there a rash you can see? | No, and the itch is generalised and has lasted more than two weeks → blood count, liver, kidney and thyroid tests. This is not a skin-only problem. | Yes → the appearance of the rash drives the reading, and the pattern follows it. |
| Is the skin dry and flaky, or red and weeping? | Dry and flaky → blood deficiency; moisten and build. Drying treatments worsen it. | Red and weeping → damp-heat; clear and drain. Moisturising alone will not hold. |
| Does the itch stay in one place or move? | Moves, comes and goes within hours → wind. That behaviour is the diagnostic feature. | Fixed site, persistent → look at the local skin and at what is under it. |
| Is it worse after a hot shower or at night in bed? | Hot shower → barrier damage is likely; shorten and cool the shower, moisturise immediately. | Worse at night with no rash → this is the pattern that deserves a blood test rather than a cream. |
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.
- Shorten and cool the shower, and apply emollient within three minutes of getting out while the skin is still damp. This single change helps more dry itch than any product applied later in the day.
- Use a thick ointment rather than a thin lotion for dry itch. The water content of a lotion evaporates and takes more with it.
- Wash bedding and clothing in a non-biological detergent and skip fabric conditioner for a month. It is a cheap test and a common trigger.
- Do not use a topical steroid on undiagnosed itch without a look at the skin first. On some conditions it masks the appearance that would have made the diagnosis obvious.
- If the itch is generalised with nothing to see, ask for a full blood count, liver and kidney function, and thyroid tests. Say the words "generalised pruritus without rash" — it is a recognised presentation and it gets taken more seriously when named.
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.
诸痛痒疮，皆属于心。 zhū tòng yǎng chuāng, jiē shǔ yú xīn
All pain, itching and sores belong to the heart.
肺主身之皮毛，心主身之血脉，肝主身之筋膜，脾主身之肌肉，肾主身之骨髓。 fèi zhǔ shēn zhī pí máo, xīn zhǔ shēn zhī xuè mài, gān zhǔ shēn zhī jīn mó, pí zhǔ shēn zhī jī ròu, shèn zhǔ shēn zhī gǔ suǐ
The lung governs the skin and body hair, the heart the blood vessels, the liver the sinews and membranes, the spleen the flesh, the kidney the bone marrow.
皮毛者，肺之合也。 pí máo zhě, fèi zhī hé yě
Skin and body hair are what the lung pairs with.
The first line is a general principle and is regularly over-read as "all itch is heart fire", which is why the deficiency type gets treated with cooling herbs and gets worse. Classical formulas for wind include herbs that are contraindicated in pregnancy, and several of the most used are applied topically at strengths that irritate broken skin.
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 |
|---|---|---|---|
| Pruritus | sāo yǎng | 瘙痒 | 皮肤瘙痒 (itchy skin), 痒 (yang, itch) |
| Wind | fēng | 风 | a description of behaviour — sudden, moving, changing — not a substance |
| Blood deficiency generating wind | xuè xū shēng fēng | 血虚生风 | dryness-driven itch in depleted skin |
| Lung governs skin and hair | fèi zhǔ pí máo | 肺主皮毛 | the lung’s outward correspondence |
Check your own pattern
Itchy skin 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.