Introduction: Allergic Rhinitis – Symptoms, Causes, and Treatment
Do you often wake up sneezing, with an itchy nose or a blocked nose that keeps returning? These symptoms may be caused by allergic rhinitis, a condition in which the inside of the nose becomes inflamed after the immune system reacts to substances in the environment.
Allergic rhinitis is sometimes called hay fever, although the name can be misleading. Hay is not necessarily the cause, and allergic rhinitis does not usually cause a fever.
In Singapore, house dust mites are a particularly common trigger, which means symptoms may occur throughout the year rather than during a particular season. While allergic rhinitis is usually not dangerous, persistent symptoms can interfere with sleep, concentration, work, school and everyday comfort.
What Are the Symptoms of Allergic Rhinitis?
Symptoms can range from mild and occasional to persistent and troublesome.
Common symptoms include:
- Frequent or repeated sneezing
- A clear, runny nose
- A blocked or stuffy nose
- An itchy nose
- Postnasal drip, where mucus flows down the back of the throat
- A reduced sense of smell
- Itchy, red or watery eyes
- An itchy throat
- Throat clearing
- Coughing, particularly when postnasal drip is present
These symptoms often appear after exposure to something the person is allergic to and may continue while that exposure remains.
How Allergic Rhinitis Can Affect Daily Life
A blocked nose can make breathing less comfortable, especially at night. Some people may begin breathing through their mouth or snoring because airflow through the nose is reduced.
In children, persistent nasal blockage may contribute to mouth breathing and disturbed sleep. Poor sleep can also leave both children and adults feeling tired or less able to concentrate during the day.
Allergic Rhinitis or a Common Cold: How Can You Tell the Difference?
Allergic rhinitis and the common cold can both cause sneezing, a runny nose and congestion, but there are useful differences.
Allergies are more likely to cause an itchy nose and itchy or watery eyes. Symptoms may also begin quickly after exposure to a trigger such as dust mites, pets or mould and can keep returning.
A cold is caused by a viral infection and is more likely to be accompanied by fever, body aches or feeling generally unwell. It usually settles as the infection clears, whereas allergy symptoms may persist while exposure to the allergen continues.
If symptoms keep returning or are difficult to distinguish from another nasal problem, a medical assessment can help identify the cause.
What Causes Allergic Rhinitis?
Allergic rhinitis occurs when the immune system overreacts to a normally harmless substance called an allergen.
When a sensitive person breathes in an allergen, the body releases chemicals including histamine. This leads to inflammation and irritation inside the nose, causing symptoms such as sneezing, itching, congestion and increased mucus.
Common Allergens in Singapore
House dust mites are the most common allergen highlighted in current Singapore guidance. They are commonly found in mattresses, pillows, bedding, carpets and other fabric furnishings.
Other possible allergens include:
- Animal dander, which consists of tiny flakes of skin shed by animals
- Mould spores
- Cockroach-related allergens
- Pollen from plants
Pollen-driven seasonal allergies are more commonly associated with temperate climates. In Singapore, many people experience symptoms throughout the year because indoor allergens such as house dust mites remain present.
What Can Make Allergic Rhinitis Symptoms Worse?
Not every substance that makes the nose react is an allergen. Some substances simply irritate an already sensitive nose and can make existing symptoms feel worse.
Haze, cigarette smoke, strong fragrances and other airborne irritants may irritate the nose, eyes or throat. This can make sneezing, congestion or discomfort more noticeable even when these substances are not the underlying cause of the allergy.
During periods of poorer air quality in Singapore, people who notice irritation should follow current public health advice and reduce exposure where practical.
Who Is More Likely to Develop Allergic Rhinitis?
Allergic rhinitis tends to run in families, and people with asthma or eczema are also more likely to have allergic rhinitis.
This reflects a general tendency towards allergic conditions rather than a guarantee that someone will develop the condition.
How Is Allergic Rhinitis Diagnosed?
Diagnosis usually begins with a discussion about your symptoms, when they occur, and whether they seem linked to particular environments or triggers.
The doctor may also examine the nose and consider whether another condition could be contributing to the blockage.
If symptoms are persistent, an ENT specialist may use a small camera to examine the nasal passages more closely, particularly when nasal blockage does not improve or needs further investigation.
When Allergy Testing May Be Useful
Skin prick testing can help identify sensitivity to specific allergens. Blood tests can also look for allergy-related antibodies to particular substances.
Testing is most useful when the trigger is unclear or identifying a specific allergen would change the management plan.
How Is Allergic Rhinitis Treated?
Treatment aims to reduce symptoms, improve nasal breathing and limit the effect of allergies on daily life.
Most people are managed with a combination of reducing allergen exposure and using appropriate medication.
Reducing Exposure to Allergens
Complete avoidance is often impossible, especially when the trigger is something as common as house dust mites. However, reducing exposure may help.
Useful measures can include:
- Using dust-mite-resistant mattress and pillow covers
- Washing bedding regularly
- Reducing carpets and unnecessary soft furnishings that collect dust
- Using damp cleaning methods
- Vacuuming regularly
- Keeping the bedroom as free from unnecessary dust-collecting items as practical
If a confirmed pet allergy is contributing to symptoms, keeping pets out of the bedroom may help reduce exposure. Mould problems should also be addressed where practical.
Antihistamines
Antihistamines reduce the effects of histamine and are particularly useful for sneezing, itching, a runny nose and watery eyes.
Some antihistamines can cause drowsiness, so a doctor or pharmacist can advise on an appropriate choice.
Steroid Nasal Sprays
Steroid nasal sprays reduce inflammation inside the nose and are commonly used when symptoms are persistent or nasal blockage is a major problem.
They work best when used regularly and with the correct technique rather than only when symptoms become severe. Maximum symptom relief may take around two weeks, so they should not be judged after only a few doses.
Although the word “steroid” may sound concerning, these medicines act mainly inside the nose and are commonly used for allergic rhinitis when appropriate.
Saline Nasal Sprays and Rinses
Saline sprays or nasal irrigation can help wash mucus and allergens from the nasal passages and may soothe irritation.
They can often be used alongside other treatments. If using a nasal irrigation device, follow the product instructions or advice given by your healthcare professional.
Decongestants
Decongestants can temporarily relieve a badly blocked nose, but nasal decongestant sprays and drops are not intended for long-term use.
Current Singapore guidance recommends not using topical decongestants for more than three to five days because prolonged use can cause rebound congestion. This means the nose becomes persistently blocked again after the medicine wears off.
Decongestants are not suitable for everyone, so check with a healthcare professional if you have other medical conditions or take regular medication.
When May Immunotherapy Be Considered?
If allergic rhinitis remains troublesome despite appropriate medication and reducing allergen exposure, immunotherapy may be considered for selected patients.
The treatment exposes the immune system to controlled amounts of a specific allergen over time, with the aim of reducing sensitivity. Depending on the allergen and treatment plan, it may be given by injection or as treatment placed under the tongue.
Immunotherapy is a longer-term treatment and is not required for everyone. A specialist assessment is needed to determine whether it is appropriate.
When Should You See an ENT Specialist?
Consider an ENT assessment if:
- Nasal symptoms continue despite appropriate treatment
- Nasal blockage is persistent or severe
- Symptoms regularly disturb your sleep
- Symptoms interfere with work, school or everyday activities
- You are unsure what is triggering your symptoms
- Your sense of smell remains reduced
- You experience recurring sinus or ear problems
- Asthma or breathing symptoms appear to be worsening
Persistent nasal blockage is not always caused by allergy alone. Nasal polyps, swelling of tissues inside the nose, or a deviated nasal septum may also contribute to obstruction.
An ENT examination can help determine whether allergic rhinitis is the main problem or whether another condition is contributing.
Managing Allergic Rhinitis in Singapore
Because house dust mites are a major local allergen and can be present indoors throughout the year, allergic rhinitis in Singapore is often a year-round problem rather than a clearly seasonal one.
Long-term control usually depends on reducing relevant allergen exposure and using treatment correctly. Smoke, strong fragrances and haze may also irritate the nose and make existing symptoms more troublesome without being the underlying allergy.
It is therefore useful to look at both allergy triggers and environmental irritants when trying to understand why symptoms keep returning.
Conclusion
Allergic rhinitis can cause much more than an occasional sneeze. When nasal blockage, itching, a runny nose or eye symptoms keep returning, they can interfere with sleep and everyday comfort.
For many people, the condition can be controlled effectively by identifying likely allergens, reducing exposure where practical and using treatments such as antihistamines, steroid nasal sprays or saline rinses correctly.
If symptoms remain persistent, severe or difficult to explain, an ENT assessment can help confirm whether allergic rhinitis is the main cause and check for other nasal problems. The aim is not simply to tolerate a “sensitive nose”, but to find a practical approach that keeps symptoms under control.
Frequently Asked Questions (FAQs)
1. Can Allergic Rhinitis Go Away Permanently?
Allergic rhinitis may improve over time, but symptoms can return when you are exposed to allergens. For many people, the condition can be controlled effectively with allergen reduction and appropriate treatment.
For selected patients with persistent symptoms, immunotherapy may help reduce sensitivity to a specific allergen over time.
2. Is Allergic Rhinitis Contagious?
No. Allergic rhinitis is an immune reaction to allergens and cannot be passed from one person to another.
This is different from the common cold, which is caused by a virus and can spread between people.
3. Can Allergic Rhinitis Cause Sinus Problems?
Allergic rhinitis can occur alongside sinus conditions, and persistent inflammation or congestion may contribute to nasal and sinus symptoms in some people. However, having allergic rhinitis does not automatically mean that someone has a sinus infection.
Persistent or troublesome sinus symptoms should be assessed rather than assumed to be caused by allergy.
4. Can Children Have Allergic Rhinitis?
Yes. Allergic rhinitis can affect children as well as adults and may cause a blocked or runny nose, repeated sneezing, itchy eyes and disturbed sleep.
If symptoms are frequent or are affecting sleep, school or everyday activities, medical assessment can help identify the likely trigger and suitable treatment.
5. When Should I Worry About a Constantly Blocked Nose?
A blocked nose that does not improve with appropriate treatment deserves assessment, particularly if it is affecting sleep, breathing or your sense of smell.
Persistent blockage may be caused by allergic rhinitis, but other problems such as nasal polyps or structural narrowing can produce similar symptoms. An ENT examination can help determine the cause.