Common Asthma Triggers in the Home

Why Your Home Can Worsen Asthma Symptoms

If you live with asthma, your home should feel like a safe place. Yet many of the things that set off coughing, wheezing and chest tightness are quietly present in everyday rooms — in bedding, on windowsills, in soft furnishings and in the air itself. Most of these triggers can be reduced with small, affordable changes, and you do not have to tackle everything at once.

Triggers vary from person to person. Some people react to dust mites, others to mould spores, pet dander or strong fragrances. Working out which ones matter most to you makes everything else easier.

Dust Mites: The Invisible Housemate

Dust mites are tiny creatures that feed on shed skin flakes and thrive in warm, humid places. They are happiest in mattresses, pillows, duvets, carpets and soft toys, which is why bedrooms often cause the most trouble.

• Wash bedding, including pillowcases and duvet covers, at 60°C every week if you can — this kills mites and removes the allergen.
• Use allergen-barrier covers on your mattress, duvet and pillows, and wipe them down rather than washing them.
• Keep soft toys off the bed, or wash them at 60°C. If one comfort toy is essential, seal it in a bag in the freezer for 24 hours.
• Choose hard flooring where you can and reduce the number of rugs. If you have carpets, vacuum regularly using a machine with a HEPA filter.
• Damp dust rather than dry dusting, so allergens are captured instead of flicked into the air.

Mould and Damp: Where Moisture Gathers

Mould releases spores that irritate airways, and it grows wherever moisture lingers — around windows, in bathroom corners, behind wardrobes and on cold external walls. UK weather, double glazing and drying laundry indoors all make it more likely.

• Aim to keep indoor humidity between 30% and 50%. A cheap hygrometer will tell you where you stand.
• Open windows briefly each day and use extractor fans in the bathroom and kitchen, leaving them running for ten minutes after a shower or cooking.
• Dry washing outdoors or in a vented tumble dryer. If you must dry it inside, keep the window open and the door shut.
• Wipe condensation from windows and sills daily, and clean small patches of mould with a diluted spray while wearing a mask and opening a window.
• If mould keeps coming back, tell your landlord or housing provider — persistent damp is usually a building problem, not a cleaning problem.

Pets, Pollen and Other Allergens That Travel Indoors

Pet dander — the flakes of skin and proteins in saliva and urine that animals shed — sticks to upholstery, carpets and clothing, and lingers long after a pet has left the room. Pollen also travels indoors on hair, clothes and shoes.

• Keep pets out of the bedroom and off the bed. For many people this single change helps more than anything else.
• Wash pet bedding weekly and brush pets outdoors, ideally not by the person with asthma.
• Change clothes and rinse your hair after time outdoors on high-pollen days, and keep windows closed when counts are high.
• If carpets or pets are unavoidable, consider a HEPA air cleaner in the room where you sleep.

Strong Scents and Household Chemicals

Fragrance is a trigger many people overlook, because it does not show up on allergy tests. Aerosol deodorants, plug-in fresheners, scented candles, bleach and heavily perfumed laundry products can all tighten the airways.

• Choose fragrance-free or unscented cleaning products, soaps and detergents where you can.
• Swap aerosols for roll-ons, sticks or pump sprays, and spray away from your face.
• Open a window and use an extractor fan when cleaning, decorating or cooking anything smoky.
• Avoid scented diffusers and reed sticks, and ask visitors to go easy on perfume or aftershave.
• Ventilate well after painting, new furniture or a wood-burning stove.

Keeping a Trigger Diary to Find Your Pattern

Because triggers are personal, a short diary is the most reliable way to spot yours. Keep it for two to four weeks and note a few simple things each day.

• Your symptoms and when they appeared — morning, night, after cleaning, after a shower.
• Your peak flow readings, if you have a meter, taken at the same times each day.
• Where you were and what you were doing, including anything new: a different cleaning product, a new pet, a damp patch, a cold snap.
• The weather, pollen levels, and whether you had a cold or infection.
• Whether you used your reliever inhaler, and how often.

Take your diary to your asthma review and show your GP, asthma nurse or pharmacist. They can help you connect the dots, check your inhaler technique and make sure your preventer inhaler is doing its job. Cutting down triggers supports good medical care — it never replaces it. If your symptoms are worsening, or you need your reliever more often than usual, seek advice promptly rather than waiting for your next appointment.