Mould Allergy: Symptoms, Causes, and Treatment Options

Mould is a specific, common fungus that releases spores into the air we breathe.

Thriving in wet and damp environments, and found both indoors and outdoors, mould can cause significant health concerns, not the least of which is allergy and asthma symptoms.

According to Asthma Australia, up to half of Australian homes report mould or dampness inside, a recognised risk factor for respiratory irritation and allergic symptoms.

However, only 3–10% of people in the general population have an allergic sensitisation to mould spores.

As leading allergy specialists in Sydney, we’ve put together the following article exploring the link between mould and allergies, including common symptoms, treatment options, and how we can help at Allergy Testing Sydney.

Common symptoms of a mould allergy

No one wants to live in a mouldy environment, but some people have more adverse reactions than others.

A mould allergy can result in your immune system reacting to mould that is normally harmless.

A mould allergy operates in much the same way as other respiratory allergies.

You may notice mould allergy symptoms like :

• Nasal congestion
• Runny nose
• Sneezing
• Wheezing
• Coughing
• Itchy or watery eyes
• Itchy throat

While the above could be signs of a mould allergy, they may also be signs of other allergies or respiratory conditions.

The best way to find out more is to undergo allergy testing in Sydney.

Who is most at risk for a mould allergy?

Anyone with a family history of allergies or asthma is at higher risk because allergy‑prone immune systems tend to overreact to common environmental triggers like mould spores.

Among people with asthma, mould allergy sensitisation can be much more common – in some reports affecting up to 80% of those with asthma.

Living or working in damp, poorly ventilated spaces where mould thrives increases the chance of developing symptoms, especially if there’s prolonged exposure to spores.

People with asthma, allergic rhinitis or other underlying respiratory conditions often experience worse symptoms.

Those with weakened immune systems or chronic lung diseases are also more sensitive.

In contrast, healthy individuals without these risk factors are less likely to have significant issues from common mould exposure.

How an allergy to mould is diagnosed

At Allergy Testing Sydney, we start with a detailed clinical history.

We’ll ask about your symptoms, when they occur and what environments make them worse.

Based on that, we’ll select appropriate allergens to test for, including common mould spores.

The two main diagnostic tools used are:

• Skin prick testing, where small amounts of mould allergens are placed on your skin (usually your forearm) and the skin is lightly pricked. Within about 15–20 minutes, any allergic reaction (a raised, itchy bump) is measured to see if you’re sensitised to mould.
• Blood testing (specific IgE tests), which measures the level of IgE antibodies in your blood that are specific to mould allergens, helping confirm sensitisation if a skin prick isn’t suitable (for example, you’re on antihistamines).

Treatment options for mould allergies

As with many allergies, one of the best treatments is avoidance. This means keeping your home as free of mould as possible. You can do this by:

• Fixing moisture and leaks: Repair dripping taps, roofs and plumbing quickly so mould can’t grow, and run exhaust fans in bathrooms and kitchens to cut humidity.
• Control indoor humidity: Use dehumidifiers and air conditioners to keep humidity low, and improve ventilation with open windows where possible.
• Regular cleaning: Clean bathrooms, kitchens and other moisture‑prone spots with appropriate cleaners so mould spores don’t take hold.
• Use air purifiers: HEPA filter air purifiers can reduce airborne mould spores and make indoor air easier to breathe.

Beyond avoidance, there are other recognised ways to help manage mould allergies.

Your Allergy Testing Sydney professionals may recommend allergen‑specific immunotherapy, which gradually exposes your immune system to tiny amounts of mould allergens over time to help reduce sensitivity and the severity of reactions.

Mould or allergies: How to differentiate?

Feature	Mould Allergy	Other Allergies (pollen/hay fever)
Timing	Can occur year-round, especially indoors in damp areas. Symptoms may persist regardless of season.	Often seasonal – e.g. spring/summer for pollen. Symptoms usually flare when specific pollen is in the air.
Common Triggers	Mould spores in damp, humid environments (bathrooms, kitchens, outdoor leaf piles).	Pollen (trees, grass, weeds)
Where Symptoms Occur	Symptoms may be worse indoors where mould growth is present.	Symptoms often peak when outdoors during high pollen days.
Symptom Pattern	Similar to other allergies: sneezing, runny/stuffy nose, itchy/watery eyes, coughing, post-nasal drip.	Sneezing, itchy/watery eyes, runny nose, nasal congestion – often tied closely to pollen exposure.
Asthma Link	More likely to trigger or worsen asthma symptoms (wheezing, chest tightness, shortness of breath).	Can also trigger asthma in some people, but pollen-related asthma peaks during pollen season.
Indoor Environmental Clues	Symptoms when in moist, poorly ventilated rooms or after rain/humidity.	Less likely tied to specific indoor moisture – symptoms improve indoors with windows closed.

How Allergy Testing Sydney can help

With extensive experience, Dr Richard Baker compounds vaccine drops tailored to each patient’s individual allergic sensitivities.

Dr Baker has a particular focus on mycology, studying how moulds and fungi impact allergy sufferers, especially those with asthma and respiratory conditions.

He takes a natural approach with medications and emphasises preventative medicine in his treatment methods.

His expertise ensures patients receive thorough assessments and effective solutions tailored to their unique needs.

Get relief from your allergies today. No GP referral is needed to book an appointment with us.