Dust mite allergy: what causes it, the symptoms, and the treatments that actually work

If you wake up blocked, sneezing or itchy and feel better once you are out of the house, dust mites are the most likely cause. This guide explains what is happening, what the symptoms look like, and which treatments make a real difference, ranked from most to least effective.

What causes dust mite allergy?

House dust mites are tiny creatures, about a third of a millimetre long, that live in mattresses, pillows, duvets, carpets and soft furnishings. They feed on the skin flakes we shed every night and thrive in warm, humid bedding.

You are not allergic to the mites themselves. You are allergic to a protein in their droppings. Each mite produces around 20 droppings a day, and these break into a fine dust that you breathe in and that settles on your skin while you sleep. Your immune system overreacts to it, and that is what causes the symptoms.

Dust mite allergen peaks in autumn and winter, when the heating goes on and windows stay shut. If your symptoms get worse from October, that is a strong clue.

Dust mite allergy symptoms

• Blocked or runny nose, especially first thing in the morning
• Sneezing fits when you make the bed or get into it
• Itchy, watery or red eyes
• Itchy skin, eczema flare-ups or red patches after sleeping
• Coughing, wheezing or tight chest at night
• Poor sleep and waking up tired even after a full night

The tell-tale pattern is symptoms that are worse at night and in the morning, and better when you are away from home. If you have asthma or severe symptoms, speak to your GP, who can arrange an allergy test.

Treatments that work, ranked

Medicines treat the symptoms. The only way to treat the cause is to reduce how much dust mite allergen you are exposed to, and most of that exposure happens in bed. Here is what makes the biggest difference, in order.

1. Seal your mattress, pillows and duvet (biggest impact)

Your bed holds more dust mites than anywhere else in your home, and you spend a third of your life with your face in it. Zip-sealed encasements put a barrier between you and the mites inside. Mites already in there are trapped and die, and new ones cannot get in. This is the single most effective step, and it works from the first night.

It only works if all six sides are sealed and the fabric is tight enough to stop the allergen, not just the mite. Fitted "anti allergy" protectors that only cover the top of the mattress do very little.

See the NHS backed Protector Set →

2. Wash bedding weekly at 60°C

60°C kills dust mites. 40°C does not. Wash sheets, pillowcases and duvet covers every week at 60°C, and dry them fully.

3. Bring the humidity down

Dust mites need humidity above about 50% to survive. Keeping your bedroom drier, by airing it every morning or running a dehumidifier, shrinks the population over time.

4. Vacuum with a HEPA filter

A vacuum without a sealed HEPA filter blows the allergen back into the air. Use a HEPA vacuum on the mattress (before you encase it), carpets and soft furnishings once or twice a week.

5. Medication for symptom relief

Antihistamines, nasal sprays and eye drops can ease symptoms, and your GP or pharmacist can advise on what suits you. They do not reduce your exposure, so symptoms come back when you stop.

What does not work

Plug-in ultrasonic repellers have no good evidence behind them. Sprays on their own kill mites on the surface but do not reach the ones inside the mattress. Freezing kills mites in small items but leaves the allergen behind. Each of these can help as an extra, but none replaces sealing the bed.

Where to start

If you only do one thing, seal your mattress. If you can do two, add your pillows, because that is where you breathe all night. If you want the full fix, seal mattress, pillows and duvet together and wash your bedding at 60°C every week.

Questions people ask

Can you get rid of dust mites completely?

Not from a whole home, but you can cut your exposure in bed to almost nothing by sealing the mattress, pillows and duvet. That is where most of the allergen you breathe comes from.

How long until symptoms improve?

Many people notice a difference within the first few nights of sealing their bed. Skin and chest symptoms can take a few weeks to settle fully.

Do I need an allergy test first?

It helps to confirm the cause, and your GP can arrange one. Many people start with the bed anyway, because the pattern of symptoms is so clear.

Is dust mite allergy worse in winter?

Usually, yes. Central heating, closed windows and damp autumn weather keep bedrooms warm and humid, which is when dust mites and their allergen peak.

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This guide is general information, not medical advice. If you have asthma, severe symptoms or a child with symptoms, speak to your GP or pharmacist. Questions about which products to choose? Call Richard on 0330 122 1646.