Allergic Rhinitis in Singapore

This form occurs year-round and is common in Singapore. Symptoms may persist daily or most days, triggered by indoor allergens. House dust mites can thrive in Singapore’s humid climate. Patients with perennial allergic rhinitis may experience symptoms that can worsen at night or early morning when dust mite exposure in bedding may be higher.

Less common in Singapore due to our consistent tropical climate, seasonal allergic rhinitis may still affect some individuals during specific periods. This can occur during haze seasons when air quality deteriorates, or when certain plants release pollen. Some patients may also experience seasonal patterns when travelling to temperate countries.

This type involves intermittent symptoms occurring with sporadic exposure to allergens, not generally in the patient’s environment. Examples include visiting homes with pets, exposure to cigarette smoke, or encountering strong perfumes. Symptoms may develop quickly upon exposure and can resolve once the allergen is removed.

• Clear, watery nasal discharge
• Occasional sneezing (2-3 times in succession)
• Mild nasal congestion
• Slight itching in the nose or throat
• Minor eye watering
• Mild postnasal drip
• Occasional throat clearing

• Frequent sneezing fits
• Persistent nasal blockage affecting breathing
• Constant runny nose requiring frequent tissue use
• Itchy, red, watery eyes
• Dark circles under eyes (allergic shiners)
• Mouth breathing due to nasal obstruction
• Disrupted sleep from nasal congestion
• Reduced sense of smell and taste

• Complete nasal obstruction
• Severe facial pain or pressure
• Persistent headaches
• Significant sleep disturbance and daytime fatigue
• Difficulty concentrating at work or school
• Recurrent sinus infections
• Ear fullness or popping
• Chronic cough from postnasal drip

Symptoms typically appear within minutes of allergen exposure and can persist for hours or days, depending on continued exposure. Some patients may notice symptoms worsen during sleep or upon waking, when dust mite exposure from bedding is highest.

These medications form the cornerstone of treatment for allergic rhinitis in Singapore. They reduce inflammation in the nasal passages, controlling all significant symptoms, including congestion, runny nose, sneezing, and itching. Modern formulations have minimal systemic absorption, making them safe for long-term use. Patients may notice improvement within several days, with benefit developing over weeks of consistent use. Your ENT specialist may demonstrate proper spray technique for optimal medication delivery.

Second-generation antihistamines provide relief from sneezing, itching, and a runny nose without causing significant drowsiness. These medications block histamine receptors, preventing the allergic cascade. While effective for many symptoms, they offer limited relief for nasal congestion. Antihistamines work well for episodic symptoms or as adjunct therapy with nasal sprays. Options include once-daily formulations for convenience and improved compliance.

These sprays offer symptom relief, often working more quickly than oral antihistamines. They control sneezing, runny nose, and nasal itching while providing modest congestion relief. Some patients prefer them to oral medications because they have fewer systemic effects. Combination with intranasal corticosteroids may provide symptom control in moderate-to-severe cases.

These oral medications block inflammatory mediators called leukotrienes, which are particularly beneficial for patients with concurrent asthma. They reduce nasal congestion, runny nose, and sneezing while potentially improving asthma control. Montelukast, commonly prescribed in Singapore, offers once-daily dosing and is well-tolerated. This treatment is particularly suited to patients who prefer oral medications or those with aspirin sensitivity.

Sublingual immunotherapy (SLIT) offers a disease-modifying treatment approach that gradually desensitises patients to specific allergens. Daily tablets dissolved under the tongue contain standardised allergen extracts, primarily for dust mite allergy in Singapore. Treatment continues for several years, with benefits that may persist after completion. This option suits motivated patients with proven allergen sensitivity who desire long-term symptom reduction beyond symptomatic medications.

Regular nasal washing with isotonic or hypertonic saline solution physically removes allergens and inflammatory mediators from the nasal passages. This simple, drug-free approach may reduce symptoms and medication requirements. Proper technique using squeeze bottles or neti pots for effective cleansing. Many patients perform irrigation twice daily, which is particularly beneficial during haze periods or high allergen exposure.

These medications provide relief from severe nasal congestion but require careful use. Topical decongestants may not be used for more than several days due to the risk of rebound congestion. Oral decongestants offer longer use potential but may cause insomnia or elevated blood pressure. Your ENT specialist may advise appropriate use during severe symptom flares while maintaining long-term control with other medications.

When medical management fails to control symptoms adequately, surgical options may help. Radiofrequency turbinate reduction uses controlled heating to shrink swollen turbinates, thereby improving nasal airflow. This minimally invasive procedure, performed under local anaesthesia, requires no packing and allows recovery. Patients with structural abnormalities like a deviated septum may benefit from concurrent septoplasty.

While you cannot entirely prevent allergic rhinitis if you’re predisposed, several strategies may help reduce symptom frequency and severity. Environmental control forms the foundation of prevention in Singapore’s tropical climate.

Dust mite reduction requires comprehensive bedroom management. Use dust-mite-proof covers on mattresses and pillows, wash bedding weekly in hot water above 60°C, and maintain bedroom humidity below 50% using dehumidifiers. Replace carpets with hard flooring and minimise soft furnishings that harbour mites. Regular vacuuming with HEPA-filtered cleaners may reduce allergen levels.

Improving indoor air quality with HEPA air purifiers may help, particularly in bedrooms. Keep windows closed during haze periods and high pollen days. Regular air conditioner maintenance can help prevent mould growth in filters and vents. Avoid indoor smoking and minimise the use of strong fragrances or cleaning products.

Personal measures include showering before bed to remove allergens from hair and skin, changing clothes after outdoor activities, and using wraparound sunglasses outdoors to protect eyes from allergens. Consider wearing a mask during high-pollution periods or when doing dusty activities. Starting preventive medications before known trigger exposures, such as antihistamines before visiting homes with pets, may help reduce symptom development. Individual results and effectiveness of prevention strategies may vary.