What Is It?
Allergic rhinitis is inflammation inside the nose caused by an allergic reaction. It happens when the immune system reacts to allergens such as pollen, dust mites, mould, animal dander, or certain environmental triggers.
It is commonly known as hay fever, although it is not caused only by hay and does not usually involve fever. Allergic rhinitis often causes sneezing, runny nose, blocked nose, itchy nose, itchy eyes, watery eyes, or postnasal drip.
Allergic rhinitis is usually not dangerous, but it can affect sleep, concentration, school, work, exercise, and daily comfort. It may be seasonal, happening during certain pollen seasons, or perennial, meaning symptoms occur throughout the year due to indoor allergens such as dust mites, mould, or pets.
It is usually considered when sneezing, nasal itch, clear runny nose, or congestion keeps returning, especially after exposure to likely allergens. Other conditions can feel similar, including common cold, non-allergic rhinitis, acute rhinosinusitis, nasal polyps, medicine-related congestion, and irritant-related nasal symptoms.
Why Allergic Rhinitis Is So Common
Allergic rhinitis is common because the nose is constantly exposed to the air we breathe. Pollen, dust, mould spores, pet dander, haze, smoke, perfumes, and air-conditioning can all irritate or trigger symptoms in sensitive people.
People often search for allergic rhinitis because it can look like a repeated cold. The key difference is that allergic rhinitis often causes itch, sneezing, and clear watery discharge, and it may recur in the same places, seasons, or situations.
What Causes It?
Allergic rhinitis happens when the immune system overreacts to a normally harmless substance. This reaction releases inflammatory chemicals that cause swelling, itching, sneezing, mucus production, and nasal blockage.
Common Causes and Triggers
Pollen and outdoor allergens
Tree, grass, and weed pollen can trigger seasonal allergic rhinitis, especially during certain times of the year.
Dust mites and indoor dust
Dust mites are a common cause of year-round symptoms, especially in bedrooms, bedding, carpets, curtains, and soft furnishings.
Mould spores
Mould can trigger symptoms in damp rooms, poorly ventilated areas, or places with visible mould growth.
Animal dander
Cats, dogs, and other animals can trigger allergic rhinitis in sensitive people.
Irritants that worsen symptoms
Smoke, haze, strong odours, perfume, cleaning sprays, and air pollution may worsen symptoms, even if they are not true allergens.
Not all rhinitis is allergic. Non-allergic rhinitis can be triggered by smoke, strong smells, weather changes, medicines, or irritants without an allergic immune reaction.
Allergic rhinitis is different from a common cold. A cold is caused by a virus and may include sore throat, cough, body aches, or fever, while allergic rhinitis usually causes repeated sneezing, itch, and clear watery mucus without fever. Thick, coloured, or foul-smelling discharge, especially with fever or facial pain, may suggest another condition.
What Should You Do?
If symptoms are mild and familiar, first observe what triggers them. Notice whether symptoms happen around dust, pets, pollen, mould, air-conditioning, haze, strong smells, or certain rooms.
What to Observe First
Pay attention to:
- Whether sneezing, itch, runny nose, or blocked nose is the main issue
- Whether mucus is clear or thick and coloured
- Whether symptoms are seasonal or year-round
- Whether symptoms worsen in certain places, such as bedrooms, offices, outdoors, or around pets
- Whether itchy or watery eyes occur together
- Whether sleep, school, work, or exercise is affected
- Whether there is fever, facial pain, thick nasal discharge, wheezing, or breathlessness
How to Tell If It Is Mild, Moderate, or Severe
Mild allergic rhinitis may cause occasional sneezing, itch, clear runny nose, or mild blockage without major disruption.
Moderate allergic rhinitis may happen more often and affect sleep, concentration, school, work, exercise, or daily comfort.
Severe or concerning symptoms include persistent blocked nose, worsening facial pain, thick discharge, wheezing, breathlessness, poor sleep, or symptoms that do not improve.
How Is It Usually Managed?
Allergic rhinitis is usually managed by identifying triggers, reducing allergen exposure where possible, and controlling nasal inflammation when appropriate. General steps may include keeping rooms well ventilated, reducing dust exposure, avoiding smoke or strong odours, and washing the face or changing clothes after heavy pollen exposure.
A pharmacist can help assess whether symptoms sound like allergic rhinitis, common cold, sinusitis, non-allergic rhinitis, or another nasal condition. Pharmacist advice is useful if symptoms keep recurring, affect sleep, or you are unsure which approach is suitable.
Some allergy or blocked-nose medicines may not be suitable for pregnancy, high blood pressure, glaucoma, prostate problems, or people taking regular medicines.
Ask a Pharmacist If Unsure
Ask a pharmacist if symptoms are mild but recurring, seasonal, linked with triggers, or affecting sleep, concentration, school, work, or daily activities.
Seek medical advice earlier for children under 6 years old with persistent, disruptive, or uncertain symptoms, adults aged 65 years and above, pregnant women, people with asthma, glaucoma, prostate problems, high blood pressure, heart disease, or those taking regular medicines.
People with asthma should pay attention to nasal allergy symptoms because uncontrolled rhinitis may worsen wheeze, cough, or breathlessness.
When to See a Doctor
See a doctor if symptoms are linked with:
- Wheezing, breathlessness, or worsening asthma
- Fever or feeling very unwell
- Severe facial pain or swelling
- Thick green, yellow, or foul-smelling discharge that persists or worsens
- Symptoms mainly on one side of the nose
- Recurrent nosebleeds
- Loss of smell that persists
- Persistent blocked nose despite avoiding triggers
- Symptoms affecting sleep or daily life for more than 2 to 4 weeks
- Symptoms in a child under 6 years old that are persistent, disruptive, or uncertain
- Suspected allergy with severe or worsening symptoms
Quick Summary
- Allergic rhinitis is nasal inflammation caused by an allergic reaction.
- It is often called hay fever, but it is not usually linked with fever.
- Common signs include sneezing, itchy nose, clear runny nose, blocked nose, and itchy watery eyes.
- Common triggers include pollen, dust mites, mould, pets, smoke, haze, and strong odours.
- Seek advice if symptoms affect sleep, persist, are one-sided, or come with fever, facial pain, breathlessness, or worsening asthma.
FAQ
What is allergic rhinitis?
Allergic rhinitis is inflammation inside the nose caused by an allergic reaction to triggers such as pollen, dust mites, mould, animal dander, or environmental irritants.
Is allergic rhinitis the same as hay fever?
Hay fever is a common name for allergic rhinitis, especially when symptoms are triggered by pollen. Allergic rhinitis can also happen all year round due to indoor allergens.
Is allergic rhinitis serious?
It is usually not serious, but it can affect sleep, concentration, school, work, exercise, and asthma control. Severe or persistent symptoms should be assessed.
Can allergic rhinitis cause cough?
Yes. Postnasal drip from allergic rhinitis can irritate the throat and trigger throat clearing or cough, especially at night.
Why do my allergic rhinitis symptoms keep coming back?
Symptoms can recur when you are repeatedly exposed to triggers such as dust mites, pollen, mould, pets, haze, smoke, or strong odours.
How long does allergic rhinitis last?
It depends on the trigger. Seasonal symptoms may last during pollen exposure, while year-round symptoms may persist if indoor allergens remain present.
Is allergic rhinitis the same as a cold?
No. A cold is caused by a virus and usually improves within days. Allergic rhinitis often causes repeated sneezing, itch, and clear watery mucus, and may recur with triggers.
When should I see a doctor for allergic rhinitis?
See a doctor if symptoms are severe, one-sided, persistent, affect sleep for more than 2 to 4 weeks, or come with fever, facial pain, breathlessness, wheezing, recurrent nosebleeds, or worsening asthma.