Allergies (Food/Environmental)

What are Allergies?

Allergies are common and affect both children and adults worldwide. In Singapore’s warm and humid environment, environmental and food allergies are on the rise, often coexisting with other atopic conditions like eczema, asthma or allergic rhinitis.

Although allergies can disrupt sleep, focus, diet and daily comfort, they are highly manageable. With the right support, many people find relief through lifestyle changes, allergy testing and targeted treatment.

What causes Allergies?

When the immune system wrongly identifies a harmless substance as a threat, it triggers an overactive response. Instead of protecting the body, this reaction causes unnecessary inflammation and allergy symptoms.

When someone with allergies encounters a trigger (allergen), the immune system responds as if the body is under attack. This process usually involves:

Common Types of Allergies

Allergic reactions can stem from many sources. But the two broad categories that are prevalent in both children and adults are:

Food Allergies

This involves an abnormal immune reaction to proteins in certain foods. These reactions may occur within minutes or a few hours after eating.

Some of the common food allergens include:

• Eggs and dairy — this is more common in children but may persist in adulthood.
• Fruits and vegetables — fruits such as kiwi, banana or apple, especially in people with pollen allergies oral allergy syndrome (OAS). OAS is a mild allergic reaction that occurs when certain fresh fruits, vegetables or nuts trigger itching or swelling in the mouth or throat. This is more common in people with pollen allergies. 
• Peanuts and tree nuts — these are one of the most common causes of severe allergic reactions. Even trace amounts may lead to significant symptoms.
• Shellfish — shellfish such as prawns, crabs and squid. Shellfish allergies are particularly common among adults in Asia and can trigger hives, swelling and even anaphylaxis.
• Soy and wheat — these are often found in processed foods, making them harder to avoid.

Environmental Allergies

This type of allergy is caused by substances in your surroundings that your immune system mistakenly sees as threats.

Some of the common environmental allergens are:

• Cockroach allergens — present in homes and food preparation areas and linked to both asthma and skin irritation.
• Dust mites — they thrive in Singapore’s humid climate and are a major trigger for eczema, allergic rhinitis and asthma.
• Mould spores — especially common in damp or poorly ventilated spaces.
• Pet dander — proteins found in an animal’s skin (dander), saliva or urine can trigger symptoms in sensitised individuals.
• Pollen — less seasonal than in temperate countries, but still present from flowering trees and plants in urban greenery.

What are the symptoms of Allergies?

The symptoms can vary depending on the trigger and how the body reacts to it. While some reactions are immediate, others may develop over time. It is important to understand the signs so you can take timely steps to manage them.

Symptoms of Food allergy 

Food allergies can trigger a range of symptoms, from mild to severe. These usually appear shortly after eating the trigger food, but in some cases, they may take a few hours to develop.

• Breathing difficulties — wheezing, nasal congestion or shortness of breath.
• Digestive symptoms — nausea, vomiting, stomach cramps, bloating or diarrhoea.
• Mouth and throat irritation — tingling, itching or swelling of the lips, tongue or throat.
• Skin reactions — hives, redness, swelling or itching around the mouth or body.
• Anaphylaxis (severe reaction) — a life-threatening emergency involving difficulty breathing, rapid heartbeat, drop in blood pressure and loss of consciousness. Immediate medical attention is required.

Symptoms of Environmental allergy 

Environmental allergens like dust mites, pollen, pet dander and mould can affect your skin, eyes and respiratory system. These symptoms may flare up at certain times of the year or persist year-round, especially in humid climates like Singapore.

• Eye symptoms — itchy, red, watery or swollen eyes (allergic conjunctivitis).
• Fatigue or poor sleep — often due to disturbed breathing or itchiness at night.
• Nasal symptoms — sneezing, runny or blocked nose, postnasal drip (often mistaken for a cold).
• Respiratory symptoms — coughing, wheezing, shortness of breath or tightness in the chest.
• Skin irritation — rashes, hives or worsening of eczema.

Who is at risk of Allergies in Singapore?

Although allergies are common, certain people face a higher likelihood of developing allergic reactions based on age, genetics and daily exposure. This includes:

• • Age — allergies can occur at any stage of life:
    • Young children and the elderly are often more sensitive
    • Infants and toddlers have developing immune systems that may overreact to food or environmental triggers
    • Older adults may develop more respiratory allergies due to cumulative exposure to allergens and age-related changes in the immune system Ethnicity — allergies occur across all ethnic groups. However, some studies suggest that individuals of Asian descent may have higher rates of certain allergies, like atopic dermatitis and food allergies. Skin-related allergies in darker skin tones may also lead to more noticeable pigmentation changes after inflammation.
  • Family history and genetic predisposition — a family history of allergies, asthma, eczema or hay fever increases the risk. This inherited tendency makes the immune system more prone to reacting to harmless substances.

• Pre-existing allergic conditions — those with asthma, eczema or allergic rhinitis often have heightened sensitivity. They are also more likely to develop additional allergies or more severe reactions.

• Environmental exposure — living in urban and tropical climates like Singapore means constant contact with allergens such as dust mites, pollen, mould and pollution. This can trigger or worsen allergic reactions.

• Diet and lifestyle — changes in diet, including increased processed foods and decreased exposure to natural microbes, may contribute to rising allergy rates. Smoking, stress and sedentary habits can also influence immune responses.
• Occupational risks — jobs that involve regular exposure to chemicals, dust or other irritants can increase allergy risk or worsen existing conditions.

How are Allergies diagnosed in Singapore?

Diagnosis should always involve a thorough clinical assessment, combining both medical history and test results. This helps avoid over-diagnosis based on sensitisation alone as not all positive results indicate a true allergy.

Depending on the case, diagnosis may involve a combination of the following procedures: 

• Medical history — a dermatologist will ask detailed questions about your symptoms, including their onset, duration, severity and frequency. This also includes:
  • Dietary habits
  • Family history of allergic conditions
  • Home and work environments
  • Lifestyle factors
  • Any known or suspected triggers
• Symptoms review — this involves a thorough review of how your body reacts to certain allergens. The goal is to determine whether allergy is related to food, environmental exposure or another cause.
• Skin prick testing — a commonly used test where small amounts of suspected allergens are introduced into the skin using a gentle lancet. A positive reaction usually appears as a small, raised bump within 15 to 20 minutes, indicating sensitisation to that substance.
• Blood tests (specific IgE) — a blood test may be ordered to measure levels of IgE antibodies against specific allergens. 
• Oral food challenge — a controlled food challenge may be performed under medical supervision for individuals with suspected food allergies. This involves eating gradually increasing amounts of suspected food to observe for a reaction in a safe setting.
• Patch testing — patch testing is used when allergic contact dermatitis is suspected. This is used particularly for delayed-type reactions to substances like metals, fragrances or preservatives. Patches are usually left on for 48 hours and then read twice within a week.

How are Allergies managed and treated in Singapore?

An effective allergy treatment is personalised and focuses on identifying triggers, relieving symptoms and preventing future reactions. With guidance and consistency, the condition can be managed.

Allergen Identification and Avoidance

• Environmental control — using dehumidifiers, regular cleaning and avoiding smoking indoors can reduce airborne allergens like dust mites, mould and pet dander.
• Food avoidance — strict avoidance is key once a food allergy is identified. Carrying emergency medication such as an epinephrine auto-injector may be recommended for individuals with severe food allergies.
• Trigger education and testing — understanding what causes your allergy allows you to take control. A dermatologist may recommend lifestyle changes, label-reading for food allergens or household adjustments like air purifiers or anti-dust mite bedding.

Medications

• Antihistamines — used to control sneezing, runny nose, hives or itchiness. Non-drowsy options are available for use during the day.
• Nasal corticosteroid sprays — these sprays are effective for allergic rhinitis. They reduce inflammation in the nasal passages and relieve congestion, sneezing and a runny nose.
• Topical treatments — topical treatments such as corticosteroid creams or calcineurin inhibitors are prescribed for allergy-related skin inflammation.
• Epinephrine injection (EpiPen) — immediate injection of epinephrine can be life-saving for those at risk of anaphylaxis.

Allergen Immunotherapy (Desensitisation)

• Subcutaneous immunotherapy (SCIT) — SCIT involves regular allergy shots over several months to years. It is commonly used for dust mite, pollen or pet allergies.
• Sublingual immunotherapy (SLIT) — SLIT is an under-the-tongue alternative to injections. It is often used for dust mites and grass pollen with fewer side effects.

Lifestyle Modifications

• Clothing and fabric care — wearing breathable fabrics, changing clothes after outdoor activities helps to reduce flare-ups. Avoiding known irritants, like wool or harsh detergents, similarly lowers the risk of allergies.
• Safe dietary planning — reading food labels carefully, informing restaurants about food allergies and preparing safe alternatives when travelling are vital.
• Education and support — for children, parents, caregivers and schools, understanding the child’s allergies, symptoms and emergency action plans is crucial to safety.
• Home hygiene — frequent washing of linens, vacuuming with HEPA filters and removing carpets can significantly reduce indoor allergens.
• Stress management — emotional stress can worsen allergic conditions. Practices like deep breathing, mindfulness and maintaining regular sleep may offer real benefits.

Summary

Allergies can be frustrating and even overwhelming - from hives and digestive issues to chronic rashes or respiratory symptoms, they can disrupt daily life.

But with the right support and strategies, allergies are highly manageable. Understanding your triggers, working with a dermatologist to develop a personalised plan and staying consistent with treatment can greatly improve quality of life.

If you are struggling with unexplained reactions or allergic symptoms, consider speaking to a dermatologist. At Dermatology Collective , we offer comprehensive testing and tailored treatment options to help you gain control of your allergies. Get in touch with us today to schedule an appointment and discover how we can help you.