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Home / Concerns / Asthma and allergy / Allergies at a glance
Allergies at a glance

Fact sheet

Allergies at a glance

If you’re affected by asthma and allergies, you’re not alone.

Up to 80 percent of people with asthma have allergies like hay fever, which can cause their asthma symptoms to flare up.

Allergies can occur when a person’s immune system reacts to substances, known as allergens, that are usually harmless to most people.

Examples of allergens include house dust mites, pollen, mould and pet dander.

Contact with one of these substances can cause a person with allergies to develop a reaction that leads to redness and swelling. This can affect:

  • Breathing – asthma and hay fever
  • Skin – dermatitis, eczema and hives
  • Eyes – allergic conjunctivitis
  • Whole body – anaphylaxis (rare but serious)

Allergies may run in families. The genetic or inherited tendency to develop allergic diseases is known as atopy.

What you can do

Allergies can make life rather miserable for millions of Australians and New Zealanders – particularly in certain periods of the year like late spring and early summer, when there are high levels of pollen in the air.

Know your triggers

Triggers are different for everyone so it’s important to work out whether certain triggers affect you. Your doctor can work with you to identify possible allergic triggers and help you understand how they affect your asthma.

Most people are allergic to more than one trigger and sometimes the response is different. For example, you might get itchy eyes around cats but a runny nose during pollen season.

The severity of the allergic reaction varies between people and depends on the circumstances. A reaction may not be immediate.

Allergy testing

It is important to work out which allergens in your environment trigger your asthma. Avoiding or reducing your exposure to these allergens may be an important part of managing your asthma.

Your doctor will ask you questions to identify your possible allergic triggers and order or perform allergy testing.

The two main allergy tests are skin prick tests, and blood tests for serum specific IgE* (previously referred to as RAST** tests). These tests identify antibodies to specific allergens.

Avoiding allergens

The best way to manage allergies is to avoid the allergens, but this can often be a challenge.

Efforts to avoid or reduce allergy exposure can also be costly, time-consuming or impractical, and may not work for every person or circumstance.

However, once you know what to focus on, you can try and take steps to avoid triggers or reduce their impact.

For more information on how to limit your exposure to specific triggers, visit our Know Your Triggers page.

Infant feeding

The Australasian Society of Clinical Immunology and Allergy (ASCIA) advises:

  • Do not exclude foods that are potential allergy triggers (e.g. peanuts) from your diet while pregnant as there is no evidence that this will prevent allergies in your baby.
  • Introduce solid foods from around 4-6 months while still breastfeeding.
  • Give one new food at a time; if a food is tolerated, continue to give this as a part of a varied diet. If there is any reaction to any food, you should avoid that food until you can see a doctor about a possible food allergy.

Similar resources

Sleep and asthma fact sheet

Sleep is essential for good health.  Asthma symptoms can disrupt sleep and sleep disturbances can affect asthma control and quality of life. See our advice to improve asthma management and sleep quality.

Using a spacer with your inhaler

It is important for both adults and children to use a spacer with a metered dose inhaler, as the spacer helps the medicine get to the small airways where it is most needed.

How to use a metered dose inhaler (puffer) with a spacer for children
How to use a metered dose inhaler (puffer) with a spacer for adults

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  • Asthma & allergies

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    • Understanding asthma and allergies

    • Know your triggers

    • Creating a healthy home

    • Resource hub

    • National Asthma Week 2024

    • World Asthma Day 2024

    • News

    • FAQs

    • Community Asthma Program – Get individual help with your child’s asthma

    • Sensitive Choice Video Library

  • Concerns

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Sensitive Choice is a program of the National Asthma Council Australia.
National Asthma Council Australia 2025.

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153-161 Park Street
South Melbourne VIC 3205

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office@sensitivechoice.com

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