Allergic rhinitis is an allergy-driven inflammation of the lining of the nose that causes sneezing, itching, a runny nose and nasal blockage. It happens when the body’s immune system overreacts to otherwise harmless airborne particles called allergens, releasing chemicals such as histamine. That response makes the nose, and often the eyes and throat, irritable and inflamed. Unlike a cold, allergic rhinitis is not caused by a virus and does not spread from person to person. Common allergens that cause allergic rhinitis include dust mites, pet dander, grass pollen, animal hair and cigarette smoke.
Often called ‘hay fever’, allergic rhinitis is not usually caused by hay, and fever is not a typical feature. In Singapore, it is often perennial rather than seasonal, as local research has shown that house dust mite sensitisation is especially prominent here. This helps explain why many patients have year-round symptoms, while seasonal pollen-related allergies are generally less relevant than in temperate countries. Dust mites and pet dander remain common triggers for allergic reactions in Singapore throughout the year.
Allergic rhinitis can disrupt sleep, concentration, school or work performance, exercise tolerance and overall quality of life. It also overlaps with other airway conditions, especially asthma and chronic sinus problems, which is one reason persistent symptoms deserve proper attention rather than endless self-treatment.
The typical allergic rhinitis symptoms are sneezing, a blocked nose, a clear runny nose and an itching of the nose, eyes or throat. Signs of allergic rhinitis also include a sensation of mucus dripping down the throat (postnasal drip, or PND), frequent throat clearing, a persistent cough, a sore throat, or a reduced sense of smell. Some patients develop allergic conjunctivitis with prominent watery eyes and eye itching. Some may also feel tired because their allergic rhinitis blocks their nose, leading to poor sleep.
Some patients, especially children, may also develop dark circles under the eyes, frequent nose rubbing, morning sneezing, or symptoms that worsen after sleeping in a dust-mite-rich bedroom.
The symptom pattern often helps distinguish allergic rhinitis from a cold. Hay fever symptoms and other symptoms of allergic rhinitis tend to appear suddenly after exposure to an allergen, may come and go with environmental changes, and often include itching. A viral cold is more likely to be accompanied by fever, thick mucus, general aches, and a clearly infectious pattern. Even so, patients commonly confuse the two, especially when nasal blockage is their main complaint.
Nasal allergy can also affect areas beyond the nose. Some patients notice itchy or blocked ears, an itchy throat, headaches or facial pressure, especially when the congestion is persistent. Others develop coughing that worsens when lying down due to a postnasal drip. If symptoms remain poorly controlled, the downstream effects on sleep and daily functioning can grow more significant.
You should see an ENT specialist when allergic rhinitis symptoms are persistent, severe, uncertain in cause, or not improving with the appropriate allergic rhinitis treatment. Mild episodes that respond to simple treatments are common, but repeated nasal blockage, poor sleep, nasal drainage, reduced sense of smell, or symptoms that interfere with work, school or daily comfort warrant a further evaluation.
Specialist review is also useful when the diagnosis of allergic rhinitis may not be straightforward. A blocked nose is not always allergic rhinitis. Structural problems that are connected to but not caused by allergic rhinitis include a deviated nasal septum, hypertrophy of the inferior turbinate, enlarged adenoids, nasal polyps, or chronic sinusitis, all of which can mimic or worsen allergic symptoms. A patient may have allergic rhinitis and a structural problem at the same time, which is why an ENT assessment by a specialist can be more informative than repeatedly switching over-the-counter medications for allergic rhinitis.
You should seek medical review sooner if you have thick yellow or green discharge, persistent fever, asthma symptoms, significant facial pain, or allergic rhinitis symptoms that remain severe despite the regular use of a nasal steroid spray for more than two weeks. These features can suggest a sinus infection, asthma-related problems, or another diagnosis that requires more urgent treatment.
The diagnosis of allergic rhinitis is based on the symptom pattern, physical examination and, when needed, allergy tests. A good history often provides strong clues. Doctors look at when the symptoms occur, whether they are seasonal allergies or year-round, what common allergens and environmental exposures make them worse, whether sleep is affected, and whether the patient also has asthma, eczema, food allergies or a family history of allergies. Potential causes of allergic rhinitis include family history, coexisting conditions, and an ongoing exposure to common allergens such as house dust mites and grass pollen. Allergic rhinitis commonly runs in families and often coexists with other allergic conditions.
An allergic rhinitis ENT examination includes a physical examination and a nasoendoscopy, which can show whether the nasal lining is swollen, whether the inferior turbinates are enlarged due to hypertrophy, whether there is excess mucus, and whether other causes of obstruction, such as nasal polyps or a deviated nasal septum, are contributing to the allergic rhinitis. This is particularly helpful when symptoms seem more severe than expected or when the main complaint is nasal congestion rather than sneezing.
Allergy tests are useful when identifying the specific allergen responsible for the change management. A skin prick test is a common option and can provide results quickly. Blood tests for allergen-specific immunoglobulin E (IgE) – a type of antibody produced by the immune system – may also be used.
In more specialised settings, other allergy tests, such as nasal provocation testing, acoustic rhinometry, or rhinomanometry, may be considered. The main goal is not simply to label the condition but to identify the responsible allergen and determine how best to reduce exposure and control allergic rhinitis.
Most patients with allergic rhinitis improve with a combination of allergen avoidance, allergy medications and, in selected cases, allergen immunotherapy. This is the foundation of acute allergic rhinitis treatment, and it remains the first step even when surgery is later considered. The treatment plan works best when it matches the actual pattern of disease rather than using the same approach for every patient.
Allergen Avoidance
Allergen avoidance is not always easy, but it can make a real difference, especially in Singapore where allergic rhinitis is commonly linked to year-round indoor triggers such as house dust mites. Practical steps include washing bed sheets in hot water at about 55 to 60°C, using allergen-proof bedding covers, vacuuming and mopping regularly, reducing indoor dampness, and limiting heavy fabric furnishings that trap dust. High-efficiency particulate air filters may help in selected homes. If pet dander is a trigger, keeping pets out of the bedroom and washing hands after handling them can reduce exposure. Avoiding cigarette smoke and other irritants can also help keep symptoms under better control.
Saline Nasal Sprays & Irrigation
Saline nasal sprays or irrigation can help clear mucus, soothe irritated nasal passages, and reduce allergen load on the mucosal surface. A nasal spray of this kind is not a replacement for proper anti-inflammatory treatment in more troublesome cases, but it is a useful adjunct and works for many patients.
Corticosteroid Nasal Sprays
Corticosteroid nasal sprays are an effective treatment for persistent allergic rhinitis symptoms, especially nasal congestion. Nasal steroids are often the most effective first-line treatment for persistent symptoms, though they do not work instantly. Patients often underestimate nasal steroids because they expect immediate symptom relief. The best effect of nasal steroids usually appears with regular, consistent use of a nasal spray rather than occasional use. A nasal spray used correctly and consistently is one of the most reliable ways to control allergic rhinitis over time.
Antihistamines
Antihistamine tablets, liquids, nasal spray formulations and eye drops are also widely used and can relieve temporary symptoms such as sneezing, itching, a runny nose and watery eyes. Non-sedating options are often preferred, but even these can affect some patients differently, so treatment should be tailored to the individual.
Other Allergy Medication
Other medications may be appropriate for selected patients. Nasal decongestants can provide short-term relief, but they are not a long-term treatment. Overuse of topical nasal decongestant sprays can cause rhinitis medicamentosa, also known as rebound nasal congestion, where the nose becomes more blocked when the spray wears off. Leukotriene receptor antagonists may be considered in some patients, especially when allergic rhinitis overlaps with asthma. If symptoms are due to vasomotor rhinitis, which is non-allergic nasal sensitivity, treatment should be tailored to the specific triggers. Patients with high blood pressure, heart conditions, glaucoma, prostate symptoms, pregnancy, or multiple regular medications should seek medical advice before using decongestants or combination cold and allergy products, as these may cause side effects or duplicate ingredients.
Allergen Immunotherapy
Allergen immunotherapy is the treatment option most likely to modify the allergic response rather than simply suppress the symptoms. Immunotherapy works by gradually exposing the immune system to carefully controlled doses of the specific allergen so that the body becomes less reactive over time. Allergy shots, delivered as subcutaneous injections, and sublingual immunotherapy placed under the tongue, are the two main forms of allergen immunotherapy. A full course of allergen immunotherapy treatment usually includes a build-up phase followed by a maintenance phase, and many patients need about three years of regular treatment for the best chance of durable symptom control.
Key Takeaway
The key point is that there is no single, universal cure for allergic rhinitis. The honest answer is that allergen immunotherapy offers the most durable improvement, but ongoing allergen avoidance and allergy medications continue to play a role for most.
The best non-surgical treatment for allergic rhinitis usually combines accurate diagnosis, realistic allergen avoidance, proper nasal spray technique, appropriate allergy medications, and an escalation to allergen immunotherapy when appropriate. When those treatment options still do not adequately control symptoms, it is reasonable to discuss surgical options.
Cryoablation of the sphenopalatine area is a minimally invasive surgical procedure used in selected patients with medically refractory chronic rhinitis. It is not a first-line treatment for every sensitive nose, and it does not remove the underlying allergic reactions. Instead, it targets the neural pathways that drive excessive nasal secretions and congestion when symptoms remain intrusive despite appropriate medical care.
More specifically, the treatment targets the posterior nasal nerve region near the sphenopalatine foramen, a key opening between the facial and nasal cavities. This area carries parasympathetic nerve fibres, which are part of the autonomic nervous system that contribute to rhinorrhoea, postnasal drip and nasal hyperreactivity. By applying controlled cold to this region, the procedure reduces the overactive nerve signalling and can alleviate symptoms such as a persistent runny nose, nasal congestion, nasal irritation and sneezing in selected patients.
Expectations are important. Cryoablation is best thought of as a symptom-control procedure rather than a cure for allergic rhinitis. Patients may still need further allergy medications afterwards, particularly if they remain heavily exposed to common allergens. However, for the right patient, the procedure can be an effective treatment to reduce severe symptoms and improve day-to-day control when nasal steroids and tablets have not been enough. Randomised studies have shown clinically meaningful improvement in chronic rhinitis symptoms after posterior nasal nerve cryotherapy.
In practical terms, an allergic rhinitis specialist may discuss cryoablation when a patient has ongoing rhinorrhoea, nasal congestion, or nasal drainage despite appropriate medical therapy, and when the anatomy and symptom profile are suitable for this approach. It may be performed under local anaesthesia in some settings, and it is sometimes combined with treatment of related structural problems, such as inferior turbinate hypertrophy or a deviated nasal septum.
When nasal blockage is mainly due to enlarged inferior turbinates or a deviated septum, procedures such as turbinate reduction or septoplasty may also be discussed; these can improve airflow but do not remove the underlying allergic tendency.
Recovery after cryoablation is usually straightforward, but patients should understand that temporary nasal discomfort and variable symptom response are possible. Most people do not undergo major surgery for allergic rhinitis, but it is still a procedure involving sensitive nasal tissue. Temporary nasal congestion, crusting, mild bleeding, facial pressure or discomfort can occur in the early period. Some patients notice allergic rhinitis symptoms improving quickly, while others improve gradually over several weeks.
Serious complications appear to be uncommon in published studies, but no procedure is risk-free. Cryoablation should be used thoughtfully, after a proper evaluation and after first-line medical measures have genuinely been tried rather than skipped.
Some patients can reduce allergy medications, while others still benefit from ongoing nasal steroids or allergen avoidance because the allergic response itself has not disappeared. This is another reason follow-up with an ENT specialist matters. The best outcomes usually come from combining procedural treatments with long-term disease management, rather than treating cryoablation as a one-step solution for every form of allergic rhinitis.
Allergic rhinitis is treatable, but the best results come from understanding what is driving your symptoms and choosing the right level of treatment. If you are living with constant sneezing, nasal blockage, poor sleep or a reduced sense of smell, and especially if over-the-counter allergy medications are no longer enough, an allergic rhinitis specialist review can help clarify what is happening and what to do next.
At Barrie Tan ENT Head & Neck Surgery, we go beyond simply confirming an allergy. The focus is on identifying allergy triggers, checking for structural causes of nasal blockage, tailoring allergy medications, and discussing whether options such as allergen immunotherapy or cryoablation may be appropriate in more persistent cases. If your symptoms keep returning or are affecting your daily life and you are looking for an allergic rhinitis specialist in Singapore, contact Barrie Tan ENT Head & Neck Surgery to arrange a consultation and discuss a treatment plan that fits your condition.
MBBS, MRCS (Edinburgh), MMed (Otorhinolaryngology), FAMS
Dr Barrie Tan is an ENT specialist at Gleneagles Hospital, Singapore, with more than 20 years of clinical and surgical experience. He previously served as Head of ENT and Director of the Centre for Hearing and Ear Implants at Singapore General Hospital. The information provided is not intended as medical advice. More about our medical experts.
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