Asthma and mould

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A GP wearing glasses and a beanie sits against a black background, posing the question 'Can mould kill you?'

Hidden mould could be worsening your asthma — learn how to spot it, reduce indoor humidity (ventilation, extractor fans, dehumidifiers), and when to seek GP or housing help to protect your breathing.

Key Takeaways

  • Mold can worsen asthma; learn to spot it and reduce humidity at home to protect your health.
  • In the webinar, GP Dr Dhir and Saira share practical tips on reducing indoor mould and damp, which trigger asthma symptoms.
  • Inspect areas like kitchens and bathrooms for visible mold and address damp issues promptly with professional help.
  • Keep indoor humidity below 50% using extractor fans, open windows, and consider dehumidifiers for persistent problems.
  • If mold affects your asthma control, seek help from your GP or asthma nurse for a review and update your treatment plan.

Introduction

In the third webinar of HIYOS’s asthma series, GP Dr Day and practice manager Saira—who has lived experience of childhood asthma—explain how household mold and damp can trigger asthma symptoms, how to spot problems, and practical steps to reduce risk and protect respiratory health.

What is mould and why it matters for asthma?

Mold is a common fungus that grows on damp surfaces and releases spores into the air. For people with asthma or mould allergy, inhaling spores can provoke wheeze, breathlessness, chest tightness, coughing or even flare‑ups and attacks. Mold can be visible as black, green or white patches and often produces a musty smell.

Spotting and addressing mold at home

  • Inspect likely areas: bathrooms, kitchens, behind wardrobes, under sinks, around windows, and where clothes are dried indoors.
  • Visible mold: small patches on removable items (curtains, cushions, carpets) should be replaced where possible. For small areas on hard surfaces, clean with detergent and water, then dry thoroughly. Avoid bleach sprays if they trigger symptoms. Ask someone without asthma to do the cleaning where possible.
  • Hidden damp: mold can grow behind furniture or inside walls. If you see any sign of damp, get professional assessment — unresolved leaks or plumbing issues need repair.

Reduce indoor humidity and condensation

  • Aim for indoor relative humidity below 50% (a hygrometer checks this).
  • Use extractor fans when cooking and showering, and open a window to ventilate rooms. Close bathroom doors when showering to contain moisture.
  • Consider a dehumidifier for persistent humidity problems; air purifiers (HEPA) may reduce airborne allergens but do not remove humidity.
  • Avoid drying clothes indoors without ventilation or a dryer that vents outside.

Other practical tips

  • Remove or minimise high‑pile carpets and soft furnishings that trap moisture and dust.
  • Use anti‑allergy covers for mattresses and pillows.
  • Choose milder cleaning products and avoid prolonged exposure to strong disinfectants that can provoke symptoms.
  • Report significant damp or mold to landlords, housing associations or local councils — persistent damp is a housing and health issue and may require formal remediation.

When to seek help

  • If mold is widespread, persistent, or caused by structural leaks, seek professional remediation and report to your landlord or housing officer.
  • If mold exposure seems to worsen asthma control, arrange an urgent review with your GP or asthma nurse to reassess treatment and update your asthma action plan. Severe or acute breathing problems should be treated as an emergency — follow your action plan and call 999 if symptoms are life‑threatening.

Real‑world perspective

Saira shares how hidden damp behind furniture triggered childhood flare‑ups and how removing the source and improving ventilation improved control. Her story highlights why early detection and tackling root causes matter.

If you’re concerned about any of the points mentioned, please reach out to your GP.

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