Why can mould affect your health?

When it comes to mould, it’s not the mould itself that typically cause health problems — it's the toxic chemicals that the mould produce. These toxic substances are called mycotoxins.

"Mycotoxins are secondary metabolites produced by microfungi that are capable of causing disease and death in humans and other animals." — National Library of Medicine
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Why does mould produce mycotoxins?

Mycotoxins are a form of chemical defence. Mould species produce them to inhibit or kill competing moulds and microorganisms. For instance, if Mould Type A colonises an area, it may release mycotoxins to prevent Mould Type B from encroaching on its territory. When you consider that these chemicals are potent enough to kill other mould strains, it's no surprise that they can also be harmful to human health.

Understanding this biological mechanism helps us see why exposure to certain moulds can lead to health issues — especially in environments with poor ventilation or water damage, where mould thrives.

Research into mould and its health effects is ongoing. As our scientific understanding deepens, we’re likely to uncover even more about the risks and biological behaviours of this complex and dangerous organism.

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