Part 1 of 6 in the allergic rhinitis series. Part 2 is how TCM reads the nose; part 3 is the measures at home; part 4 is air-conditioning and haze; part 5 is when to see a doctor first; part 6 is what an online consultation does.
"My nose is like this every year — I wake up and sneeze non-stop." A question that comes up often is this one. Malaysia has no four seasons, but air-conditioning, haze and the rainy months are all still here, so the nose is a year-round topic.
This part answers one thing: what allergic rhinitis is, and which step in the body is going wrong.
The short version
- The formal name is allergic rhinitis, a Western diagnosis — the nose irritated by something you are allergic to, says the NHS.
- It is a different thing from non-allergic rhinitis, which the NHS attributes to a cold, very hot or cold temperatures and humidity.
- What separates it from a cold is timing: within minutes of contact, against 2 to 3 days for a cold. Both pages are the NHS's.
- The middle step is histamine. In people with allergies the body mistakes something harmless for a threat and produces it — the NHS antihistamines page.
- Three classes, three steps: antihistamines block histamine, decongestant sprays reduce the swelling of the blood vessels in the nose, steroid sprays act on inflammation. The first two are the NHS's, the third HealthHub's.
- Over-the-counter decongestant sprays go no longer than 5 days at a time — using them too long can make the blocked nose worse, says the NHS.
First, the things that cannot wait
Difficulty breathing, wheezing, speaking in short phrases, or blue lips — call 999 now, or go to the nearest hospital emergency department.
A nosebleed lasting longer than 10 to 15 minutes, or bleeding that seems excessive — the NHS nosebleed page puts this one in A&E. Call 999 now, or go to the nearest hospital emergency department.
Persistent one-sided blockage, repeated nosebleeds, or blood-streaked discharge — have a doctor establish the cause first; do not treat it as allergic rhinitis yourself.
The full list is in part 5.
⚠️ A safety note: TCM and Western medicine complement each other; it is not a choice between them. If you are under medical treatment, TCM care is a layer added on top — not a layer swapped in.
A note: this section is general information only. For conditions like these, follow your doctor's diagnosis and treatment, and seek medical attention when you need it.
I. What allergic rhinitis is
Allergic rhinitis is a Western medical diagnosis. It "is where your nose gets irritated by something you're allergic to, such as pollen, causing sneezing and other symptoms" — the NHS's wording; the common allergies it lists are pollen, house dust mites, animal dander and mould.
HealthHub adds that it "results from an over reaction of the immune system to particles which they are allergic to".
The same NHS page states that allergic rhinitis "is different from non-allergic rhinitis, which is caused by things like having a cold, very hot or cold temperatures and humidity". So "it blocks the moment I walk into an air-conditioned room" has a place in Western medicine too — just not the same box.
Which box it goes in is a doctor's call — and the NHS says you may be referred to a specialist for further tests and treatment if it is not clear what is causing your symptoms or they are severe.
⚠️ A note: what this section says is for describing, not for self-diagnosis. The diagnosis of allergic rhinitis belongs to a doctor; if you do not have one yet, see a doctor first.
II. Telling it apart from a cold
The symptoms "are similar to a cold" but usually happen "within minutes of coming into contact with something you're allergic to" — the NHS. Cold symptoms "come on gradually over 2 to 3 days" and you "should begin to feel better in about 1 to 2 weeks", on its common cold page.
HealthHub adds three points: the mucus and tears "will be clear", while a cold's "may be thicker, and appear greenish or yellowish"; "Allergic rhinitis does not cause fever or muscle ache"; and it "rarely causes sore throat".
💡 Remember: the difference is not in how bad it feels. It is how fast it comes on, and whether the mucus is clear or thick. A high temperature for more than 3 days: the NHS says see a doctor.
III. The histamine step
The NHS allergic rhinitis page says only this much: allergic rhinitis "is caused by an allergic reaction". For the step in the middle you have to turn to the NHS antihistamines page.
Histamine "is normally released when your body detects something harmful, such as an infection. It causes blood vessels to expand and the skin to swell, which helps protect the body" — that is the NHS's account of what it is for.
Then the NHS sentence that matters: "in people with allergies, the body mistakes something harmless – such as pollen, animal hair or house dust – for a threat and produces histamine", and that histamine brings the itchy watering eyes, the running or blocked nose, the sneezing and the rashes.
That is where the NHS page stops. It does not spell out every step after histamine, and neither does this article.
IV. Three classes, three steps
Put the three classes you find in a pharmacy back on that chain and it is clear they are not the same thing. A pharmacist can advise on antihistamines, decongestant sprays or drops, steroid sprays, and salt water sprays or solutions, says the NHS.
Antihistamines "block the effects of a substance called histamine". That is why the NHS writes that taken before contact they "help stop this happening", and taken afterwards they "can reduce the severity of symptoms".
Decongestant nasal sprays "work by reducing the swelling of the blood vessels in your nose, which helps to open the airways" — the NHS decongestants page. That is the "blocked" step, not the allergic reaction itself.
Steroid nasal sprays "help to relieve inflammation and swelling in the nose caused by the allergens". That one is HealthHub's.
Why decongestant sprays have a 5-day cap. Using them too long "can make your stuffiness worse", so sprays and drops "should not be used for more than 5 days at a time" — the NHS decongestants page. The same 5 days is on the NHS allergic rhinitis page, which adds that these sprays can be bought without a prescription. HealthHub calls the result a "rebound blocked nose" — "constant blocked nose caused by an overuse of nasal decongestants".
The NHS non-allergic rhinitis page goes further and lists "using decongestant nasal sprays for longer than it says on the packet" among the causes of non-allergic rhinitis — a spray used to unblock the nose can become, past its limit, a source of another kind of blocked nose. Why the rebound happens, none of these pages says, and this article does not fill it in.
A spray or medicine your doctor prescribed is used as the doctor directed — never stop your medication on your own. For Chinese herbs alongside Western medication, see Can Chinese herbs be taken with Western medicine.
⚠️ A note: this section is about which step each class is aimed at, not about how to use them. Which one, how long, and whether it suits you: ask a pharmacist or a doctor.
The words in this part
- Allergic rhinitis (过敏性鼻炎) — the Western diagnosis, 鼻敏感 in Chinese; the NHS defines it as the nose irritated by something you are allergic to.
- Non-allergic rhinitis (非过敏性鼻炎) — a different thing, says the NHS: caused by a cold, very hot or cold temperatures, humidity.
- Allergen (过敏原) — the thing that sets off the reaction; the NHS's common ones are pollen, house dust mites, animal dander and mould.
- Histamine (组织胺) — released when the body detects something harmful, making blood vessels expand and the skin swell; the NHS says people with allergies produce it for harmless things too.
- Rebound blocked nose (反弹性鼻塞) — HealthHub's term: a constant blocked nose caused by an overuse of nasal decongestants.
Frequently asked
How do I tell allergic rhinitis from a cold? By how fast it comes on, and whether the mucus is clear or thick. Allergic rhinitis usually happens "within minutes of coming into contact with something you're allergic to"; cold symptoms "come on gradually over 2 to 3 days" — the NHS's two pages. A high temperature for more than 3 days: the NHS says see a doctor.
The other five parts
- Part 2: How TCM reads the nose, and the "surface"
- Part 3: At home: bedding, dust, rinsing the nose
- Part 4: Air-conditioning, haze, masks and the pharmacy
- Part 5: When to see a doctor first
- Part 6: What an online consultation does
👉 If you are not sure where to even start describing a nose problem that keeps coming back, you are welcome to book an online consultation with HansMed, where a practitioner registered under the T&CM Act 2016 can assess it with you; if anything in "First, the things that cannot wait" above or in part 5 applies, see a doctor first.
Sit with a licensed TCM practitioner from wherever you are.
HansMed Modern TCM
For general wellness education only — not medical advice. Consult a registered TCM practitioner for personal guidance.
Sources
- NHS, Allergic rhinitis, page last reviewed 08 January 2026 — https://www.nhs.uk/conditions/allergic-rhinitis/
- NHS, Common cold, page last reviewed 22 March 2024 — https://www.nhs.uk/conditions/common-cold/
- NHS, Antihistamines, page last reviewed 16 May 2023 — https://www.nhs.uk/medicines/antihistamines/
- NHS, Decongestants, page last reviewed 03 November 2022 — https://www.nhs.uk/medicines/decongestants/
- NHS, Non-allergic rhinitis, page last reviewed 04 March 2026 — https://www.nhs.uk/conditions/non-allergic-rhinitis/
- NHS, Nosebleed, page last reviewed 05 December 2023 — https://www.nhs.uk/conditions/nosebleed/
- Singapore MOH HealthHub, Allergic Rhinitis, article last reviewed 24 July 2026 — https://www.healthhub.sg/health-conditions/allergic-rhinitis
